src/auth/userdb.c

	userdb.c revision 08d6658a4e2ec8104cd1307f6baa75fdb07a24f8
/* Copyright (c) 2002-2009 Dovecot authors, see the included COPYING file */

#include "auth-common.h"
#include "array.h"
#include "auth-worker-server.h"
#include "userdb.h"

#include <stdlib.h>
#include <pwd.h>
#include <grp.h>

static ARRAY_DEFINE(userdb_interfaces, struct userdb_module_interface *);

static struct userdb_module_interface *userdb_interface_find(const char *name)
{
    struct userdb_module_interface *const *ifaces;
    unsigned int i, count;

    ifaces = array_get(&userdb_interfaces, &count);
    for (i = 0; i < count; i++) {
        if (strcmp(ifaces[i]->name, name) == 0)
            return ifaces[i];
    }
    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_append(&userdb_interfaces, &iface, 1);
}

void userdb_unregister_module(struct userdb_module_interface *iface)
{
    struct userdb_module_interface *const *ifaces;
    unsigned int i, count;

    ifaces = array_get(&userdb_interfaces, &count);
    for (i = 0; i < count; i++) {
        if (ifaces[i] == iface) {
            array_delete(&userdb_interfaces, i, 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;
    char *p;

    if (str == NULL)
        return (uid_t)-1;

    if (*str >= '0' && *str <= '9') {
        uid = (uid_t)strtoul(str, &p, 10);
        if (*p == '\0')
            return uid;
    }

    pw = getpwnam(str);
    if (pw == NULL) {
        if (request != NULL) {
            auth_request_log_error(request, "userdb",
                           "Invalid UID value '%s'", str);
        }
        return (uid_t)-1;
    }
    return pw->pw_uid;
}

gid_t userdb_parse_gid(struct auth_request *request, const char *str)
{
    struct group *gr;
    gid_t gid;
    char *p;

    if (str == NULL)
        return (gid_t)-1;

    if (*str >= '0' && *str <= '9') {
        gid = (gid_t)strtoul(str, &p, 10);
        if (*p == '\0')
            return gid;
    }

    gr = getgrnam(str);
    if (gr == NULL) {
        if (request != NULL) {
            auth_request_log_error(request, "userdb",
                           "Invalid GID value '%s'", str);
        }
        return (gid_t)-1;
    }
    return gr->gr_gid;
}

void userdb_preinit(struct auth *auth, struct auth_userdb_settings *set)
{
    struct userdb_module_interface *iface;
        struct auth_userdb *auth_userdb, **dest;

    auth_userdb = p_new(auth->pool, struct auth_userdb, 1);
    auth_userdb->auth = auth;
    auth_userdb->args = set->args == NULL ? "" :
        p_strdup(auth->pool, set->args);

    for (dest = &auth->userdbs; *dest != NULL; dest = &(*dest)->next)
        auth_userdb->num++;
    *dest = auth_userdb;

    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 &&
        *auth_userdb->args != '\0') {
        i_fatal("userdb %s: No args are supported: %s",
            set->driver, auth_userdb->args);
    }

    if (iface->preinit == NULL) {
        auth_userdb->userdb =
            p_new(auth->pool, struct userdb_module, 1);
    } else {
        auth_userdb->userdb =
            iface->preinit(auth_userdb, auth_userdb->args);
    }
    auth_userdb->userdb->iface = iface;
}

void userdb_init(struct auth_userdb *userdb)
{
    if (userdb->userdb->iface->init != NULL)
        userdb->userdb->iface->init(userdb->userdb, userdb->args);

    if (userdb->userdb->blocking && !worker) {
        /* blocking userdb - we need an auth server */
        auth_worker_server_init(userdb->auth);
    }
}

void userdb_deinit(struct auth_userdb *userdb)
{
    if (userdb->userdb->iface->deinit != NULL)
        userdb->userdb->iface->deinit(userdb->userdb);
}

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_vpopmail;
extern struct userdb_module_interface userdb_ldap;
extern struct userdb_module_interface userdb_sql;
extern struct userdb_module_interface userdb_nss;
extern struct userdb_module_interface userdb_checkpassword;

void userdbs_init(void)
{
    i_array_init(&userdb_interfaces, 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_vpopmail);
    userdb_register_module(&userdb_ldap);
    userdb_register_module(&userdb_sql);
    userdb_register_module(&userdb_nss);
    userdb_register_module(&userdb_checkpassword);
}

void userdbs_deinit(void)
{
    array_free(&userdb_interfaces);
}