src/auth/passdb.c

	passdb.c revision b44650b0f48a4b5f0dc240ed836833a00b643b9f
/* Copyright (C) 2002-2003 Timo Sirainen */

#include "common.h"
#include "auth-module.h"
#include "password-scheme.h"
#include "auth-worker-server.h"
#include "passdb.h"

#include <stdlib.h>

extern struct passdb_module_interface passdb_passwd;
extern struct passdb_module_interface passdb_bsdauth;
extern struct passdb_module_interface passdb_shadow;
extern struct passdb_module_interface passdb_passwd_file;
extern struct passdb_module_interface passdb_pam;
extern struct passdb_module_interface passdb_checkpassword;
extern struct passdb_module_interface passdb_vpopmail;
extern struct passdb_module_interface passdb_ldap;
extern struct passdb_module_interface passdb_sql;
extern struct passdb_module_interface passdb_sia;

struct passdb_module_interface *passdb_interfaces[] = {
#ifdef PASSDB_PASSWD
    &passdb_passwd,
#endif
#ifdef PASSDB_BSDAUTH
    &passdb_bsdauth,
#endif
#ifdef PASSDB_PASSWD_FILE
    &passdb_passwd_file,
#endif
#ifdef PASSDB_PAM
    &passdb_pam,
#endif
#ifdef PASSDB_CHECKPASSWORD
    &passdb_checkpassword,
#endif
#ifdef PASSDB_SHADOW
    &passdb_shadow,
#endif
#ifdef PASSDB_VPOPMAIL
    &passdb_vpopmail,
#endif
#ifdef PASSDB_LDAP
    &passdb_ldap,
#endif
#ifdef PASSDB_SQL
    &passdb_sql,
#endif
#ifdef PASSDB_SIA
    &passdb_sia,
#endif
    NULL
};

bool passdb_get_credentials(struct auth_request *auth_request,
                const char *input, const char *input_scheme,
                const unsigned char **credentials_r, size_t *size_r)
{
    const char *wanted_scheme = auth_request->credentials_scheme;
    const char *plaintext;
    int ret;

    if (*wanted_scheme == '\0') {
        /* anything goes */
        *credentials_r = (const unsigned char *)input;
        *size_r = strlen(input);
        return TRUE;
    }

    ret = password_decode(input, input_scheme, credentials_r, size_r);
    if (ret <= 0) {
        if (ret < 0) {
            auth_request_log_error(auth_request, "password",
                "Invalid password format for scheme %s",
                input_scheme);
        } else {
            auth_request_log_error(auth_request, "password",
                "Unknown scheme %s", input_scheme);
        }
        return FALSE;
    }

    if (!password_scheme_is_alias(input_scheme, wanted_scheme)) {
        if (!password_scheme_is_alias(input_scheme, "PLAIN")) {
            auth_request_log_info(auth_request, "password",
                "Requested %s scheme, but we have only %s",
                wanted_scheme, input_scheme);
            return FALSE;
        }

        /* we can generate anything out of plaintext passwords */
        plaintext = t_strndup(*credentials_r, *size_r);
        if (!password_generate(plaintext, auth_request->user,
                       wanted_scheme, credentials_r, size_r)) {
            auth_request_log_error(auth_request, "password",
                "Requested unknown scheme %s", wanted_scheme);
            return FALSE;
        }
    }

    return TRUE;
}

void passdb_handle_credentials(enum passdb_result result,
                   const char *password, const char *scheme,
                   lookup_credentials_callback_t *callback,
                               struct auth_request *auth_request)
{
    const unsigned char *credentials;
    size_t size = 0;

    if (result != PASSDB_RESULT_OK) {
        callback(result, NULL, 0, auth_request);
        return;
    }

    if (password == NULL ||
        !passdb_get_credentials(auth_request, password, scheme,
                    &credentials, &size))
        result = PASSDB_RESULT_SCHEME_NOT_AVAILABLE;

    callback(result, credentials, size, auth_request);
}

struct auth_passdb *passdb_preinit(struct auth *auth, const char *driver,
                   const char *args, unsigned int id)
{
    struct passdb_module_interface **p, *iface;
        struct auth_passdb *auth_passdb;

    if (args == NULL) args = "";

    auth_passdb = p_new(auth->pool, struct auth_passdb, 1);
    auth_passdb->auth = auth;
        auth_passdb->args = p_strdup(auth->pool, args);
        auth_passdb->id = id;

    iface = NULL;
    for (p = passdb_interfaces; *p != NULL; p++) {
        if (strcmp((*p)->name, driver) == 0) {
            iface = *p;
            break;
        }
    }

#ifdef HAVE_MODULES
    if (iface == NULL)
        auth_passdb->module = auth_module_open(driver);
    if (auth_passdb->module != NULL) {
        iface = auth_module_sym(auth_passdb->module,
                    t_strconcat("passdb_", driver, NULL));
    }
#endif

    if (iface == NULL) {
        i_fatal("Unknown passdb driver '%s' "
            "(typo, or Dovecot was built without support for it? "
            "Check with dovecot --build-options)",
            driver);
    }

    if (iface->preinit == NULL) {
        auth_passdb->passdb =
            p_new(auth->pool, struct passdb_module, 1);
    } else {
        auth_passdb->passdb =
            iface->preinit(auth_passdb, auth_passdb->args);
    }
    auth_passdb->passdb->iface = *iface;
    return auth_passdb;
}

void passdb_init(struct auth_passdb *passdb)
{
    if (passdb->passdb->iface.init != NULL)
        passdb->passdb->iface.init(passdb->passdb, passdb->args);

    i_assert(passdb->passdb->default_pass_scheme != NULL ||
         passdb->passdb->cache_key == NULL);

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

void passdb_deinit(struct auth_passdb *passdb)
{
    if (passdb->passdb->iface.deinit != NULL)
        passdb->passdb->iface.deinit(passdb->passdb);
#ifdef HAVE_MODULES
    if (passdb->module != NULL)
                auth_module_close(&passdb->module);
#endif
}