src/auth/auth-worker-client.c

	auth-worker-client.c revision 82f53ea81671bcc7b9bf24a34b04a4ba2752efd3
/* Copyright (C) 2005 Timo Sirainen */

#include "common.h"
#include "ioloop.h"
#include "network.h"
#include "istream.h"
#include "ostream.h"
#include "str.h"
#include "auth-request.h"
#include "auth-worker-client.h"

#include <stdlib.h>

/* If no requests have come within this time, kill ourself */
#define AUTH_WORKER_MAX_IDLE (60*10)

#define OUTBUF_THROTTLE_SIZE (1024*10)

struct auth_worker_client {
    int refcount;

        struct auth *auth;
    int fd;
    struct io *io;
    struct istream *input;
    struct ostream *output;

    time_t last_request;
    struct timeout *to;
};

static void
auth_worker_client_check_throttle(struct auth_worker_client *client)
{
    if (o_stream_get_buffer_used_size(client->output) >=
        OUTBUF_THROTTLE_SIZE) {
        /* stop reading new requests until client has read the pending
           replies. */
        if (client->io != NULL) {
            io_remove(client->io);
            client->io = NULL;
        }
    }
}

static struct auth_request *
worker_auth_request_new(struct auth_worker_client *client, unsigned int id,
            const char *args)
{
    struct auth_request *auth_request;
    const char *key, *value, *const *tmp;

    auth_request = auth_request_new_dummy(client->auth);

    client->refcount++;
    auth_request->context = client;
    auth_request->id = id;

    t_push();
    for (tmp = t_strsplit(args, "\t"); *tmp != NULL; tmp++) {
        value = strchr(*tmp, '=');
        if (value == NULL)
            continue;

        key = t_strdup_until(*tmp, value);
        value++;

        (void)auth_request_import(auth_request, key, value);
    }
    t_pop();

    return auth_request;
}

static void verify_plain_callback(enum passdb_result result,
                  struct auth_request *request)
{
    struct auth_worker_client *client = request->context;
    string_t *str;

    str = t_str_new(64);
    str_printfa(str, "%u\t", request->id);

    if (result != PASSDB_RESULT_OK)
        str_printfa(str, "FAIL\t%d", result);
    else {
        str_append(str, "OK\t");
        str_append(str, request->user);
        str_append_c(str, '\t');
        if (request->passdb_password != NULL)
            str_append(str, request->passdb_password);
        str_append_c(str, '\t');
        if (request->proxy) {
            /* we're proxying - send back the password that was
               sent by user (not the password in passdb). */
            str_printfa(str, "pass=%s\t", request->mech_password);
        }
        if (request->extra_fields != NULL)
            str_append_str(str, request->extra_fields);
    }
    str_append_c(str, '\n');
    o_stream_send(client->output, str_data(str), str_len(str));

    auth_request_unref(request);
    auth_worker_client_check_throttle(client);
    auth_worker_client_unref(client);
}

static void
auth_worker_handle_passv(struct auth_worker_client *client,
             unsigned int id, const char *args)
{
    /* verify plaintext password */
    struct auth_request *auth_request;
    const char *password;
    unsigned int num;

    num = atoi(t_strcut(args, '\t'));
    args = strchr(args, '\t');
    if (args == NULL) {
        i_error("BUG: Auth worker server sent us invalid PASSV");
        return;
    }
    args++;

    password = t_strcut(args, '\t');
    args = strchr(args, '\t');
    if (args != NULL) args++;

    auth_request = worker_auth_request_new(client, id, args);
    auth_request->mech_password =
        p_strdup(auth_request->pool, password);

    if (auth_request->user == NULL || auth_request->service == NULL) {
        i_error("BUG: PASSV had missing parameters");
        auth_request_unref(auth_request);
        return;
    }

    for (; num > 0; num--) {
        auth_request->passdb = auth_request->passdb->next;
        if (auth_request->passdb == NULL) {
            i_error("BUG: PASSV had invalid passdb num");
            auth_request_unref(auth_request);
            return;
        }
    }

    auth_request->passdb->passdb->verify_plain(auth_request, password,
                           verify_plain_callback);
}

static void
lookup_credentials_callback(enum passdb_result result, const char *credentials,
                struct auth_request *request)
{
    struct auth_worker_client *client = request->context;
    string_t *str;

    str = t_str_new(64);
    str_printfa(str, "%u\t", request->id);

    if (result != PASSDB_RESULT_OK)
        str_printfa(str, "FAIL\t%d", result);
    else {
        str_printfa(str, "OK\t%s\t{%s}%s\t", request->user,
                passdb_credentials_to_str(request->credentials),
                credentials);
        if (request->extra_fields != NULL)
            str_append_str(str, request->extra_fields);
    }
    str_append_c(str, '\n');
    o_stream_send(client->output, str_data(str), str_len(str));

    auth_request_unref(request);
    auth_worker_client_check_throttle(client);
    auth_worker_client_unref(client);
}

static void
auth_worker_handle_passl(struct auth_worker_client *client,
             unsigned int id, const char *args)
{
    /* lookup credentials */
    struct auth_request *auth_request;
    const char *credentials_str;
        enum passdb_credentials credentials;
    unsigned int num;

    num = atoi(t_strcut(args, '\t'));
    args = strchr(args, '\t');
    if (args == NULL) {
        i_error("BUG: Auth worker server sent us invalid PASSL");
        return;
    }
    args++;

    credentials_str = t_strcut(args, '\t');
    args = strchr(args, '\t');
    if (args != NULL) args++;

    credentials = atoi(credentials_str);

    auth_request = worker_auth_request_new(client, id, args);
    auth_request->credentials = credentials;

    if (auth_request->user == NULL || auth_request->service == NULL) {
        i_error("BUG: PASSL had missing parameters");
        auth_request_unref(auth_request);
        return;
    }

    for (; num > 0; num--) {
        auth_request->passdb = auth_request->passdb->next;
        if (auth_request->passdb == NULL) {
            i_error("BUG: PASSL had invalid passdb num");
            auth_request_unref(auth_request);
            return;
        }
    }

    auth_request->passdb->passdb->
        lookup_credentials(auth_request, credentials,
                   lookup_credentials_callback);
}

static void
lookup_user_callback(const char *result, struct auth_request *auth_request)
{
    struct auth_worker_client *client = auth_request->context;
    string_t *str;

    str = t_str_new(64);
    str_printfa(str, "%u\t", auth_request->id);
    if (result != NULL)
        str_append(str, result);
    str_append_c(str, '\n');

    o_stream_send(client->output, str_data(str), str_len(str));

    auth_request_unref(auth_request);
    auth_worker_client_check_throttle(client);
    auth_worker_client_unref(client);
}

static void
auth_worker_handle_user(struct auth_worker_client *client,
            unsigned int id, const char *args)
{
    /* lookup user */
    struct auth_request *auth_request;
    unsigned int num;

    num = atoi(t_strcut(args, '\t'));
    args = strchr(args, '\t');
    if (args != NULL) args++;

    auth_request = worker_auth_request_new(client, id, args);

    if (auth_request->user == NULL || auth_request->service == NULL) {
        i_error("BUG: USER had missing parameters");
        auth_request_unref(auth_request);
        return;
    }

    for (; num > 0; num--) {
        auth_request->userdb = auth_request->userdb->next;
        if (auth_request->userdb == NULL) {
            i_error("BUG: USER had invalid userdb num");
            auth_request_unref(auth_request);
            return;
        }
    }

    auth_request->userdb->userdb->
        lookup(auth_request, lookup_user_callback);
}

static int
auth_worker_handle_line(struct auth_worker_client *client, const char *line)
{
    const char *p;
    unsigned int id;

    p = strchr(line, '\t');
    if (p == NULL)
        return FALSE;

    id = (unsigned int)strtoul(t_strdup_until(line, p), NULL, 10);
    line = p + 1;

    if (strncmp(line, "PASSV\t", 6) == 0)
        auth_worker_handle_passv(client, id, line + 6);
    else if (strncmp(line, "PASSL\t", 6) == 0)
        auth_worker_handle_passl(client, id, line + 6);
    else if (strncmp(line, "USER\t", 5) == 0)
        auth_worker_handle_user(client, id, line + 5);

        return TRUE;
}

static void auth_worker_input(void *context)
{
    struct auth_worker_client *client = context;
    char *line;
    int ret;

    switch (i_stream_read(client->input)) {
    case 0:
        return;
    case -1:
        /* disconnected */
        auth_worker_client_destroy(client);
        return;
    case -2:
        /* buffer full */
        i_error("BUG: Auth worker server sent us more than %d bytes",
            (int)AUTH_WORKER_MAX_LINE_LENGTH);
        auth_worker_client_destroy(client);
        return;
    }

    client->last_request = ioloop_time;

        client->refcount++;
    while ((line = i_stream_next_line(client->input)) != NULL) {
        t_push();
        ret = auth_worker_handle_line(client, line);
        t_pop();

        if (!ret) {
            auth_worker_client_destroy(client);
            break;
        }
    }
    auth_worker_client_unref(client);
}

static int auth_worker_output(void *context)
{
    struct auth_worker_client *client = context;

    if (o_stream_flush(client->output) < 0) {
        auth_worker_client_destroy(client);
        return 1;
    }

    if (o_stream_get_buffer_used_size(client->output) <=
        OUTBUF_THROTTLE_SIZE/3 && client->io == NULL) {
        /* allow input again */
        client->io = io_add(client->fd, IO_READ,
                    auth_worker_input, client);
    }
    return 1;
}

static void auth_worker_client_timeout(void *context)
{
    struct auth_worker_client *client = context;

    if (client->last_request + AUTH_WORKER_MAX_IDLE <= ioloop_time)
                auth_worker_client_destroy(client);
}

struct auth_worker_client *
auth_worker_client_create(struct auth *auth, int fd)
{
        struct auth_worker_client *client;

    client = i_new(struct auth_worker_client, 1);
    client->refcount = 1;

    client->auth = auth;
    client->fd = fd;
    client->input =
        i_stream_create_file(fd, default_pool,
                     AUTH_WORKER_MAX_LINE_LENGTH, FALSE);
    client->output =
        o_stream_create_file(fd, default_pool, (size_t)-1, FALSE);
    o_stream_set_flush_callback(client->output, auth_worker_output, client);
    client->io = io_add(fd, IO_READ, auth_worker_input, client);

    client->last_request = ioloop_time;
    client->to = timeout_add(1000*60, auth_worker_client_timeout, client);

    return client;
}

void auth_worker_client_destroy(struct auth_worker_client *client)
{
    if (client->fd == -1)
        return;

    timeout_remove(client->to);

    i_stream_close(client->input);
    o_stream_close(client->output);

    if (client->io != NULL) {
        io_remove(client->io);
        client->io = NULL;
    }

    net_disconnect(client->fd);
    client->fd = -1;

    io_loop_stop(ioloop);
}

void auth_worker_client_unref(struct auth_worker_client *client)
{
    if (--client->refcount > 0)
        return;

    if (client->fd != -1)
        auth_worker_client_destroy(client);

    i_stream_unref(client->input);
    o_stream_unref(client->output);
    i_free(client);
}