diff options
Diffstat (limited to 'source4/heimdal/lib/hdb/hdb.c')
| -rw-r--r-- | source4/heimdal/lib/hdb/hdb.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/source4/heimdal/lib/hdb/hdb.c b/source4/heimdal/lib/hdb/hdb.c new file mode 100644 index 0000000000..53c952927f --- /dev/null +++ b/source4/heimdal/lib/hdb/hdb.c @@ -0,0 +1,373 @@ +/* + * Copyright (c) 1997 - 2004 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" + +RCSID("$Id: hdb.c,v 1.54 2005/05/29 18:12:28 lha Exp $"); + +#ifdef HAVE_DLFCN_H +#include <dlfcn.h> +#endif + +struct hdb_method { + const char *prefix; + krb5_error_code (*create)(krb5_context, HDB **, const char *filename); +}; + +static struct hdb_method methods[] = { +#if HAVE_DB1 || HAVE_DB3 + {"db:", hdb_db_create}, +#endif +#if HAVE_NDBM + {"ndbm:", hdb_ndbm_create}, +#endif +#if defined(OPENLDAP) && !defined(OPENLDAP_MODULE) + {"ldap:", hdb_ldap_create}, +#endif +#if HAVE_DB1 || HAVE_DB3 + {"", hdb_db_create}, +#elif defined(HAVE_NDBM) + {"", hdb_ndbm_create}, +#elif defined(OPENLDAP) && !defined(OPENLDAP_MODULE) + {"", hdb_ldap_create}, +#endif + {NULL, NULL} +}; + +krb5_error_code +hdb_next_enctype2key(krb5_context context, + const hdb_entry *e, + krb5_enctype enctype, + Key **key) +{ + Key *k; + + for (k = *key ? (*key) + 1 : e->keys.val; + k < e->keys.val + e->keys.len; + k++) + if(k->key.keytype == enctype){ + *key = k; + return 0; + } + return KRB5_PROG_ETYPE_NOSUPP; /* XXX */ +} + +krb5_error_code +hdb_enctype2key(krb5_context context, + hdb_entry *e, + krb5_enctype enctype, + Key **key) +{ + *key = NULL; + return hdb_next_enctype2key(context, e, enctype, key); +} + +void +hdb_free_key(Key *key) +{ + memset(key->key.keyvalue.data, + 0, + key->key.keyvalue.length); + free_Key(key); + free(key); +} + + +krb5_error_code +hdb_lock(int fd, int operation) +{ + int i, code = 0; + + for(i = 0; i < 3; i++){ + code = flock(fd, (operation == HDB_RLOCK ? LOCK_SH : LOCK_EX) | LOCK_NB); + if(code == 0 || errno != EWOULDBLOCK) + break; + sleep(1); + } + if(code == 0) + return 0; + if(errno == EWOULDBLOCK) + return HDB_ERR_DB_INUSE; + return HDB_ERR_CANT_LOCK_DB; +} + +krb5_error_code +hdb_unlock(int fd) +{ + int code; + code = flock(fd, LOCK_UN); + if(code) + return 4711 /* XXX */; + return 0; +} + +void +hdb_free_entry(krb5_context context, hdb_entry *ent) +{ + int i; + + for(i = 0; i < ent->keys.len; ++i) { + Key *k = &ent->keys.val[i]; + + memset (k->key.keyvalue.data, 0, k->key.keyvalue.length); + } + free_hdb_entry(ent); +} + +krb5_error_code +hdb_foreach(krb5_context context, + HDB *db, + unsigned flags, + hdb_foreach_func_t func, + void *data) +{ + krb5_error_code ret; + hdb_entry entry; + ret = db->hdb_firstkey(context, db, flags, &entry); + while(ret == 0){ + ret = (*func)(context, db, &entry, data); + hdb_free_entry(context, &entry); + if(ret == 0) + ret = db->hdb_nextkey(context, db, flags, &entry); + } + if(ret == HDB_ERR_NOENTRY) + ret = 0; + return ret; +} + +krb5_error_code +hdb_check_db_format(krb5_context context, HDB *db) +{ + krb5_data tag; + krb5_data version; + krb5_error_code ret; + unsigned ver; + int foo; + + tag.data = HDB_DB_FORMAT_ENTRY; + tag.length = strlen(tag.data); + ret = (*db->hdb__get)(context, db, tag, &version); + if(ret) + return ret; + foo = sscanf(version.data, "%u", &ver); + krb5_data_free (&version); + if (foo != 1) + return HDB_ERR_BADVERSION; + if(ver != HDB_DB_FORMAT) + return HDB_ERR_BADVERSION; + return 0; +} + +krb5_error_code +hdb_init_db(krb5_context context, HDB *db) +{ + krb5_error_code ret; + krb5_data tag; + krb5_data version; + char ver[32]; + + ret = hdb_check_db_format(context, db); + if(ret != HDB_ERR_NOENTRY) + return ret; + + tag.data = HDB_DB_FORMAT_ENTRY; + tag.length = strlen(tag.data); + snprintf(ver, sizeof(ver), "%u", HDB_DB_FORMAT); + version.data = ver; + version.length = strlen(version.data) + 1; /* zero terminated */ + ret = (*db->hdb__put)(context, db, 0, tag, version); + return ret; +} + +#ifdef HAVE_DLOPEN + + /* + * Load a dynamic backend from /usr/heimdal/lib/hdb_NAME.so, + * looking for the hdb_NAME_create symbol. + */ + +static const struct hdb_method * +find_dynamic_method (krb5_context context, + const char *filename, + const char **rest) +{ + static struct hdb_method method; + struct hdb_so_method *mso; + char *prefix, *path, *symbol; + const char *p; + void *dl; + size_t len; + + p = strchr(filename, ':'); + + /* if no prefix, don't know what module to load, just ignore it */ + if (p == NULL) + return NULL; + + len = p - filename; + *rest = filename + len + 1; + + prefix = strndup(filename, len); + if (prefix == NULL) + krb5_errx(context, 1, "out of memory"); + + if (asprintf(&path, LIBDIR "/hdb_%s.so", prefix) == -1) + krb5_errx(context, 1, "out of memory"); + +#ifndef RTLD_NOW +#define RTLD_NOW 0 +#endif +#ifndef RTLD_GLOBAL +#define RTLD_GLOBAL 0 +#endif + + dl = dlopen(path, RTLD_NOW | RTLD_GLOBAL); + if (dl == NULL) { + krb5_warnx(context, "error trying to load dynamic module %s: %s\n", + path, dlerror()); + free(prefix); + free(path); + return NULL; + } + + if (asprintf(&symbol, "hdb_%s_interface", prefix) == -1) + krb5_errx(context, 1, "out of memory"); + + mso = dlsym(dl, symbol); + if (mso == NULL) { + krb5_warnx(context, "error finding symbol %s in %s: %s\n", + symbol, path, dlerror()); + dlclose(dl); + free(symbol); + free(prefix); + free(path); + return NULL; + } + free(path); + free(symbol); + + if (mso->version != HDB_INTERFACE_VERSION) { + krb5_warnx(context, + "error wrong version in shared module %s " + "version: %d should have been %d\n", + prefix, mso->version, HDB_INTERFACE_VERSION); + dlclose(dl); + free(prefix); + return NULL; + } + + if (mso->create == NULL) { + krb5_errx(context, 1, + "no entry point function in shared mod %s ", + prefix); + dlclose(dl); + free(prefix); + return NULL; + } + + method.create = mso->create; + method.prefix = prefix; + + return &method; +} +#endif /* HAVE_DLOPEN */ + +/* + * find the relevant method for `filename', returning a pointer to the + * rest in `rest'. + * return NULL if there's no such method. + */ + +static const struct hdb_method * +find_method (const char *filename, const char **rest) +{ + const struct hdb_method *h; + + for (h = methods; h->prefix != NULL; ++h) + if (strncmp (filename, h->prefix, strlen(h->prefix)) == 0) { + *rest = filename + strlen(h->prefix); + return h; + } + return NULL; +} + +krb5_error_code +hdb_list_builtin(krb5_context context, char **list) +{ + const struct hdb_method *h; + size_t len = 0; + char *buf = NULL; + + for (h = methods; h->prefix != NULL; ++h) { + if (h->prefix[0] == '\0') + continue; + len += strlen(h->prefix) + 2; + } + + len += 1; + buf = malloc(len); + if (buf == NULL) { + krb5_set_error_string(context, "malloc: out of memory"); + return ENOMEM; + } + buf[0] = '\0'; + + for (h = methods; h->prefix != NULL; ++h) { + if (h->prefix[0] == '\0') + continue; + if (h != methods) + strlcat(buf, ", ", len); + strlcat(buf, h->prefix, len); + } + *list = buf; + return 0; +} + +krb5_error_code +hdb_create(krb5_context context, HDB **db, const char *filename) +{ + const struct hdb_method *h; + const char *residual; + + if(filename == NULL) + filename = HDB_DEFAULT_DB; + krb5_add_et_list(context, initialize_hdb_error_table_r); + h = find_method (filename, &residual); +#ifdef HAVE_DLOPEN + if (h == NULL) + h = find_dynamic_method (context, filename, &residual); +#endif + if (h == NULL) + krb5_errx(context, 1, "No database support! (hdb_create)"); + return (*h->create)(context, db, residual); +} |