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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "auth-common.h"
#include "array.h"
#include "ipwd.h"
#include "auth-worker-server.h"
#include "userdb.h"
static ARRAY(struct userdb_module_interface *) userdb_interfaces;
static ARRAY(struct userdb_module *) userdb_modules;
static const struct userdb_module_interface userdb_iface_deinit = {
.name = "deinit"
};
static struct userdb_module_interface *userdb_interface_find(const char *name)
{
struct userdb_module_interface *iface;
array_foreach_elem(&userdb_interfaces, iface) {
if (strcmp(iface->name, name) == 0)
return iface;
}
return NULL;
}
void userdb_register_module(struct userdb_module_interface *iface)
{
struct userdb_module_interface *old_iface;
old_iface = userdb_interface_find(iface->name);
if (old_iface != NULL && old_iface->lookup == NULL) {
/* replacing a "support not compiled in" userdb */
userdb_unregister_module(old_iface);
} else if (old_iface != NULL) {
i_panic("userdb_register_module(%s): Already registered",
iface->name);
}
array_push_back(&userdb_interfaces, &iface);
}
void userdb_unregister_module(struct userdb_module_interface *iface)
{
struct userdb_module_interface *const *ifaces;
unsigned int idx;
array_foreach(&userdb_interfaces, ifaces) {
if (*ifaces == iface) {
idx = array_foreach_idx(&userdb_interfaces, ifaces);
array_delete(&userdb_interfaces, idx, 1);
return;
}
}
i_panic("userdb_unregister_module(%s): Not registered", iface->name);
}
uid_t userdb_parse_uid(struct auth_request *request, const char *str)
{
struct passwd pw;
uid_t uid;
if (str == NULL)
return (uid_t)-1;
if (str_to_uid(str, &uid) == 0)
return uid;
switch (i_getpwnam(str, &pw)) {
case -1:
e_error(request == NULL ? auth_event : authdb_event(request),
"getpwnam() failed: %m");
return (uid_t)-1;
case 0:
e_error(request == NULL ? auth_event : authdb_event(request),
"Invalid UID value '%s'", str);
return (uid_t)-1;
default:
return pw.pw_uid;
}
}
gid_t userdb_parse_gid(struct auth_request *request, const char *str)
{
struct group gr;
gid_t gid;
if (str == NULL)
return (gid_t)-1;
if (str_to_gid(str, &gid) == 0)
return gid;
switch (i_getgrnam(str, &gr)) {
case -1:
e_error(request == NULL ? auth_event : authdb_event(request),
"getgrnam() failed: %m");
return (gid_t)-1;
case 0:
e_error(request == NULL ? auth_event : authdb_event(request),
"Invalid GID value '%s'", str);
return (gid_t)-1;
default:
return gr.gr_gid;
}
}
static struct userdb_module *
userdb_find(const char *driver, const char *args, unsigned int *idx_r)
{
struct userdb_module *const *userdbs;
unsigned int i, count;
userdbs = array_get(&userdb_modules, &count);
for (i = 0; i < count; i++) {
if (strcmp(userdbs[i]->iface->name, driver) == 0 &&
strcmp(userdbs[i]->args, args) == 0) {
*idx_r = i;
return userdbs[i];
}
}
return NULL;
}
struct userdb_module *
userdb_preinit(pool_t pool, const struct auth_userdb_settings *set)
{
static unsigned int auth_userdb_id = 0;
struct userdb_module_interface *iface;
struct userdb_module *userdb;
unsigned int idx;
iface = userdb_interface_find(set->driver);
if (iface == NULL || iface->lookup == NULL) {
/* maybe it's a plugin. try to load it. */
auth_module_load(t_strconcat("authdb_", set->driver, NULL));
iface = userdb_interface_find(set->driver);
}
if (iface == NULL)
i_fatal("Unknown userdb driver '%s'", set->driver);
if (iface->lookup == NULL) {
i_fatal("Support not compiled in for userdb driver '%s'",
set->driver);
}
if (iface->preinit == NULL && iface->init == NULL &&
*set->args != '\0') {
i_fatal("userdb %s: No args are supported: %s",
set->driver, set->args);
}
userdb = userdb_find(set->driver, set->args, &idx);
if (userdb != NULL)
return userdb;
if (iface->preinit == NULL)
userdb = p_new(pool, struct userdb_module, 1);
else
userdb = iface->preinit(pool, set->args);
userdb->id = ++auth_userdb_id;
userdb->iface = iface;
userdb->args = p_strdup(pool, set->args);
array_push_back(&userdb_modules, &userdb);
return userdb;
}
void userdb_init(struct userdb_module *userdb)
{
if (userdb->iface->init != NULL && userdb->init_refcount == 0)
userdb->iface->init(userdb);
userdb->init_refcount++;
}
void userdb_deinit(struct userdb_module *userdb)
{
unsigned int idx;
i_assert(userdb->init_refcount > 0);
if (--userdb->init_refcount > 0)
return;
if (userdb_find(userdb->iface->name, userdb->args, &idx) == NULL)
i_unreached();
array_delete(&userdb_modules, idx, 1);
if (userdb->iface->deinit != NULL)
userdb->iface->deinit(userdb);
/* make sure userdb isn't accessed again */
userdb->iface = &userdb_iface_deinit;
}
void userdbs_generate_md5(unsigned char md5[STATIC_ARRAY MD5_RESULTLEN])
{
struct md5_context ctx;
struct userdb_module *const *userdbs;
unsigned int i, count;
md5_init(&ctx);
userdbs = array_get(&userdb_modules, &count);
for (i = 0; i < count; i++) {
md5_update(&ctx, &userdbs[i]->id, sizeof(userdbs[i]->id));
md5_update(&ctx, userdbs[i]->iface->name,
strlen(userdbs[i]->iface->name));
md5_update(&ctx, userdbs[i]->args, strlen(userdbs[i]->args));
}
md5_final(&ctx, md5);
}
const char *userdb_result_to_string(enum userdb_result result)
{
switch (result) {
case USERDB_RESULT_INTERNAL_FAILURE:
return "internal_failure";
case USERDB_RESULT_USER_UNKNOWN:
return "user_unknown";
case USERDB_RESULT_OK:
return "ok";
}
i_unreached();
}
extern struct userdb_module_interface userdb_prefetch;
extern struct userdb_module_interface userdb_static;
extern struct userdb_module_interface userdb_passwd;
extern struct userdb_module_interface userdb_passwd_file;
extern struct userdb_module_interface userdb_ldap;
extern struct userdb_module_interface userdb_sql;
extern struct userdb_module_interface userdb_checkpassword;
extern struct userdb_module_interface userdb_dict;
#ifdef HAVE_LUA
extern struct userdb_module_interface userdb_lua;
#endif
void userdbs_init(void)
{
i_array_init(&userdb_interfaces, 16);
i_array_init(&userdb_modules, 16);
userdb_register_module(&userdb_passwd);
userdb_register_module(&userdb_passwd_file);
userdb_register_module(&userdb_prefetch);
userdb_register_module(&userdb_static);
userdb_register_module(&userdb_ldap);
userdb_register_module(&userdb_sql);
userdb_register_module(&userdb_checkpassword);
userdb_register_module(&userdb_dict);
#ifdef HAVE_LUA
userdb_register_module(&userdb_lua);
#endif
}
void userdbs_deinit(void)
{
array_free(&userdb_modules);
array_free(&userdb_interfaces);
}
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