src/auth/mech-login.c

	mech-login.c revision e70d5895795732b8247ab9abb045b438e954bc46
/*
 * LOGIN authentication mechanism.
 *
 * Copyright (c) 2004 Andrey Panin <pazke@donpac.ru>
 *
 * This software is released under the MIT license.
 */

#include "common.h"
#include "mech.h"
#include "passdb.h"
#include "safe-memset.h"

static void verify_callback(enum passdb_result result,
                struct auth_request *request)
{
    switch (result) {
    case PASSDB_RESULT_OK:
        auth_request_success(request, NULL, 0);
        break;
    case PASSDB_RESULT_INTERNAL_FAILURE:
        auth_request_internal_failure(request);
        break;
    default:
        auth_request_fail(request);
        break;
    }
}

static void
mech_login_auth_continue(struct auth_request *request,
             const unsigned char *data, size_t data_size)
{
    static const char prompt2[] = "Password:";
    const char *username, *error;

    if (request->user == NULL) {
        username = t_strndup(data, data_size);

        if (!auth_request_set_username(request, username, &error)) {
                        auth_request_log_info(request, "login", "%s", error);
            auth_request_fail(request);
            return;
        }

        request->callback(request, AUTH_CLIENT_RESULT_CONTINUE,
                  prompt2, strlen(prompt2));
    } else {
        char *pass = p_strndup(unsafe_data_stack_pool, data, data_size);
        auth_request_verify_plain(request, pass, verify_callback);
        safe_memset(pass, 0, strlen(pass));
    }
}

static void
mech_login_auth_initial(struct auth_request *request,
            const unsigned char *data, size_t data_size)
{
    static const char prompt1[] = "Username:";

    if (data_size == 0) {
        request->callback(request, AUTH_CLIENT_RESULT_CONTINUE,
                  prompt1, strlen(prompt1));
    } else {
        mech_login_auth_continue(request, data, data_size);
    }
}

static struct auth_request *mech_login_auth_new(void)
{
    struct auth_request *request;
    pool_t pool;

    pool = pool_alloconly_create("login_auth_request", 1024);
    request = p_new(pool, struct auth_request, 1);
    request->pool = pool;
    return request;
}

const struct mech_module mech_login = {
    "LOGIN",

    MEMBER(flags) MECH_SEC_PLAINTEXT,

    MEMBER(passdb_need_plain) TRUE,
    MEMBER(passdb_need_credentials) FALSE,

    mech_login_auth_new,
    mech_login_auth_initial,
    mech_login_auth_continue,
    mech_generic_auth_free
};