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view src/event/modules/ngx_devpoll_module.c @ 7732:59e1c73fe02b

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SSL: ssl_reject_handshake directive (ticket #195). In some cases it might be needed to reject SSL handshake based on SNI server name provided, for example, to make sure an invalid certificate is not returned to clients trying to contact a name-based virtual server without SSL configured. Previously, a "ssl_ciphers aNULL;" was used for this. This workaround, however, is not compatible with TLSv1.3, in particular, when using BoringSSL, where it is not possible to configure TLSv1.3 ciphers at all. With this change, the ssl_reject_handshake directive is introduced, which instructs nginx to reject SSL handshakes with an "unrecognized_name" alert in a particular server block. For example, to reject handshake with names other than example.com, one can use the following configuration: server { listen 443 ssl; ssl_reject_handshake on; } server { listen 443 ssl; server_name example.com; ssl_certificate example.com.crt; ssl_certificate_key example.com.key; } The following configuration can be used to reject all SSL handshakes without SNI server name provided: server { listen 443 ssl; ssl_reject_handshake on; } server { listen 443 ssl; server_name ~^; ssl_certificate example.crt; ssl_certificate_key example.key; } Additionally, the ssl_reject_handshake directive makes configuring certificates for the default server block optional. If no certificates are configured in the default server for a given listening socket, certificates must be defined in all non-default server blocks with the listening socket in question.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 22 Oct 2020 18:02:28 +0300
parents efd71d49bde0
children
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>


#if (NGX_TEST_BUILD_DEVPOLL)

/* Solaris declarations */

#ifndef POLLREMOVE
#define POLLREMOVE   0x0800
#endif
#define DP_POLL      0xD001
#define DP_ISPOLLED  0xD002

struct dvpoll {
    struct pollfd  *dp_fds;
    int             dp_nfds;
    int             dp_timeout;
};

#endif


typedef struct {
    ngx_uint_t      changes;
    ngx_uint_t      events;
} ngx_devpoll_conf_t;


static ngx_int_t ngx_devpoll_init(ngx_cycle_t *cycle, ngx_msec_t timer);
static void ngx_devpoll_done(ngx_cycle_t *cycle);
static ngx_int_t ngx_devpoll_add_event(ngx_event_t *ev, ngx_int_t event,
    ngx_uint_t flags);
static ngx_int_t ngx_devpoll_del_event(ngx_event_t *ev, ngx_int_t event,
    ngx_uint_t flags);
static ngx_int_t ngx_devpoll_set_event(ngx_event_t *ev, ngx_int_t event,
    ngx_uint_t flags);
static ngx_int_t ngx_devpoll_process_events(ngx_cycle_t *cycle,
    ngx_msec_t timer, ngx_uint_t flags);

static void *ngx_devpoll_create_conf(ngx_cycle_t *cycle);
static char *ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf);

static int              dp = -1;
static struct pollfd   *change_list, *event_list;
static ngx_uint_t       nchanges, max_changes, nevents;

static ngx_event_t    **change_index;


static ngx_str_t      devpoll_name = ngx_string("/dev/poll");

static ngx_command_t  ngx_devpoll_commands[] = {

    { ngx_string("devpoll_changes"),
      NGX_EVENT_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      0,
      offsetof(ngx_devpoll_conf_t, changes),
      NULL },

    { ngx_string("devpoll_events"),
      NGX_EVENT_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      0,
      offsetof(ngx_devpoll_conf_t, events),
      NULL },

      ngx_null_command
};


static ngx_event_module_t  ngx_devpoll_module_ctx = {
    &devpoll_name,
    ngx_devpoll_create_conf,               /* create configuration */
    ngx_devpoll_init_conf,                 /* init configuration */

    {
        ngx_devpoll_add_event,             /* add an event */
        ngx_devpoll_del_event,             /* delete an event */
        ngx_devpoll_add_event,             /* enable an event */
        ngx_devpoll_del_event,             /* disable an event */
        NULL,                              /* add an connection */
        NULL,                              /* delete an connection */
        NULL,                              /* trigger a notify */
        ngx_devpoll_process_events,        /* process the events */
        ngx_devpoll_init,                  /* init the events */
        ngx_devpoll_done,                  /* done the events */
    }

};

ngx_module_t  ngx_devpoll_module = {
    NGX_MODULE_V1,
    &ngx_devpoll_module_ctx,               /* module context */
    ngx_devpoll_commands,                  /* module directives */
    NGX_EVENT_MODULE,                      /* module type */
    NULL,                                  /* init master */
    NULL,                                  /* init module */
    NULL,                                  /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};


static ngx_int_t
ngx_devpoll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
{
    size_t               n;
    ngx_devpoll_conf_t  *dpcf;

    dpcf = ngx_event_get_conf(cycle->conf_ctx, ngx_devpoll_module);

    if (dp == -1) {
        dp = open("/dev/poll", O_RDWR);

        if (dp == -1) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                          "open(/dev/poll) failed");
            return NGX_ERROR;
        }
    }

    if (max_changes < dpcf->changes) {
        if (nchanges) {
            n = nchanges * sizeof(struct pollfd);
            if (write(dp, change_list, n) != (ssize_t) n) {
                ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                              "write(/dev/poll) failed");
                return NGX_ERROR;
            }

            nchanges = 0;
        }

        if (change_list) {
            ngx_free(change_list);
        }

        change_list = ngx_alloc(sizeof(struct pollfd) * dpcf->changes,
                                cycle->log);
        if (change_list == NULL) {
            return NGX_ERROR;
        }

        if (change_index) {
            ngx_free(change_index);
        }

        change_index = ngx_alloc(sizeof(ngx_event_t *) * dpcf->changes,
                                 cycle->log);
        if (change_index == NULL) {
            return NGX_ERROR;
        }
    }

    max_changes = dpcf->changes;

    if (nevents < dpcf->events) {
        if (event_list) {
            ngx_free(event_list);
        }

        event_list = ngx_alloc(sizeof(struct pollfd) * dpcf->events,
                               cycle->log);
        if (event_list == NULL) {
            return NGX_ERROR;
        }
    }

    nevents = dpcf->events;

    ngx_io = ngx_os_io;

    ngx_event_actions = ngx_devpoll_module_ctx.actions;

    ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;

    return NGX_OK;
}


static void
ngx_devpoll_done(ngx_cycle_t *cycle)
{
    if (close(dp) == -1) {
        ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                      "close(/dev/poll) failed");
    }

    dp = -1;

    ngx_free(change_list);
    ngx_free(event_list);
    ngx_free(change_index);

    change_list = NULL;
    event_list = NULL;
    change_index = NULL;
    max_changes = 0;
    nchanges = 0;
    nevents = 0;
}


static ngx_int_t
ngx_devpoll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
{
#if (NGX_DEBUG)
    ngx_connection_t *c;
#endif

#if (NGX_READ_EVENT != POLLIN)
    event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT;
#endif

#if (NGX_DEBUG)
    c = ev->data;
    ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
                   "devpoll add event: fd:%d ev:%04Xi", c->fd, event);
#endif

    ev->active = 1;

    return ngx_devpoll_set_event(ev, event, 0);
}


static ngx_int_t
ngx_devpoll_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
{
    ngx_event_t       *e;
    ngx_connection_t  *c;

    c = ev->data;

#if (NGX_READ_EVENT != POLLIN)
    event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT;
#endif

    ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
                   "devpoll del event: fd:%d ev:%04Xi", c->fd, event);

    if (ngx_devpoll_set_event(ev, POLLREMOVE, flags) == NGX_ERROR) {
        return NGX_ERROR;
    }

    ev->active = 0;

    if (flags & NGX_CLOSE_EVENT) {
        e = (event == POLLIN) ? c->write : c->read;

        if (e) {
            e->active = 0;
        }

        return NGX_OK;
    }

    /* restore the pair event if it exists */

    if (event == POLLIN) {
        e = c->write;
        event = POLLOUT;

    } else {
        e = c->read;
        event = POLLIN;
    }

    if (e && e->active) {
        return ngx_devpoll_set_event(e, event, 0);
    }

    return NGX_OK;
}


static ngx_int_t
ngx_devpoll_set_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
{
    size_t             n;
    ngx_connection_t  *c;

    c = ev->data;

    ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
                   "devpoll fd:%d ev:%04Xi fl:%04Xi", c->fd, event, flags);

    if (nchanges >= max_changes) {
        ngx_log_error(NGX_LOG_WARN, ev->log, 0,
                      "/dev/pool change list is filled up");

        n = nchanges * sizeof(struct pollfd);
        if (write(dp, change_list, n) != (ssize_t) n) {
            ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
                          "write(/dev/poll) failed");
            return NGX_ERROR;
        }

        nchanges = 0;
    }

    change_list[nchanges].fd = c->fd;
    change_list[nchanges].events = (short) event;
    change_list[nchanges].revents = 0;

    change_index[nchanges] = ev;
    ev->index = nchanges;

    nchanges++;

    if (flags & NGX_CLOSE_EVENT) {
        n = nchanges * sizeof(struct pollfd);
        if (write(dp, change_list, n) != (ssize_t) n) {
            ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
                          "write(/dev/poll) failed");
            return NGX_ERROR;
        }

        nchanges = 0;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_devpoll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
    ngx_uint_t flags)
{
    int                 events, revents, rc;
    size_t              n;
    ngx_fd_t            fd;
    ngx_err_t           err;
    ngx_int_t           i;
    ngx_uint_t          level, instance;
    ngx_event_t        *rev, *wev;
    ngx_queue_t        *queue;
    ngx_connection_t   *c;
    struct pollfd       pfd;
    struct dvpoll       dvp;

    /* NGX_TIMER_INFINITE == INFTIM */

    ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
                   "devpoll timer: %M", timer);

    if (nchanges) {
        n = nchanges * sizeof(struct pollfd);
        if (write(dp, change_list, n) != (ssize_t) n) {
            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                          "write(/dev/poll) failed");
            return NGX_ERROR;
        }

        nchanges = 0;
    }

    dvp.dp_fds = event_list;
    dvp.dp_nfds = (int) nevents;
    dvp.dp_timeout = timer;
    events = ioctl(dp, DP_POLL, &dvp);

    err = (events == -1) ? ngx_errno : 0;

    if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) {
        ngx_time_update();
    }

    if (err) {
        if (err == NGX_EINTR) {

            if (ngx_event_timer_alarm) {
                ngx_event_timer_alarm = 0;
                return NGX_OK;
            }

            level = NGX_LOG_INFO;

        } else {
            level = NGX_LOG_ALERT;
        }

        ngx_log_error(level, cycle->log, err, "ioctl(DP_POLL) failed");
        return NGX_ERROR;
    }

    if (events == 0) {
        if (timer != NGX_TIMER_INFINITE) {
            return NGX_OK;
        }

        ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
                      "ioctl(DP_POLL) returned no events without timeout");
        return NGX_ERROR;
    }

    for (i = 0; i < events; i++) {

        fd = event_list[i].fd;
        revents = event_list[i].revents;

        c = ngx_cycle->files[fd];

        if (c == NULL || c->fd == -1) {

            pfd.fd = fd;
            pfd.events = 0;
            pfd.revents = 0;

            rc = ioctl(dp, DP_ISPOLLED, &pfd);

            switch (rc) {

            case -1:
                ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                    "ioctl(DP_ISPOLLED) failed for socket %d, event %04Xd",
                    fd, revents);
                break;

            case 0:
                ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
                    "phantom event %04Xd for closed and removed socket %d",
                    revents, fd);
                break;

            default:
                ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
                    "unexpected event %04Xd for closed and removed socket %d, "
                    "ioctl(DP_ISPOLLED) returned rc:%d, fd:%d, event %04Xd",
                    revents, fd, rc, pfd.fd, pfd.revents);

                pfd.fd = fd;
                pfd.events = POLLREMOVE;
                pfd.revents = 0;

                if (write(dp, &pfd, sizeof(struct pollfd))
                    != (ssize_t) sizeof(struct pollfd))
                {
                    ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                                  "write(/dev/poll) for %d failed", fd);
                }

                if (close(fd) == -1) {
                    ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                                  "close(%d) failed", fd);
                }

                break;
            }

            continue;
        }

        ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
                       "devpoll: fd:%d, ev:%04Xd, rev:%04Xd",
                       fd, event_list[i].events, revents);

        if (revents & (POLLERR|POLLHUP|POLLNVAL)) {
            ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
                          "ioctl(DP_POLL) error fd:%d ev:%04Xd rev:%04Xd",
                          fd, event_list[i].events, revents);
        }

        if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
            ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
                          "strange ioctl(DP_POLL) events "
                          "fd:%d ev:%04Xd rev:%04Xd",
                          fd, event_list[i].events, revents);
        }

        if (revents & (POLLERR|POLLHUP|POLLNVAL)) {

            /*
             * if the error events were returned, add POLLIN and POLLOUT
             * to handle the events at least in one active handler
             */

            revents |= POLLIN|POLLOUT;
        }

        rev = c->read;

        if ((revents & POLLIN) && rev->active) {
            rev->ready = 1;
            rev->available = -1;

            if (flags & NGX_POST_EVENTS) {
                queue = rev->accept ? &ngx_posted_accept_events
                                    : &ngx_posted_events;

                ngx_post_event(rev, queue);

            } else {
                instance = rev->instance;

                rev->handler(rev);

                if (c->fd == -1 || rev->instance != instance) {
                    continue;
                }
            }
        }

        wev = c->write;

        if ((revents & POLLOUT) && wev->active) {
            wev->ready = 1;

            if (flags & NGX_POST_EVENTS) {
                ngx_post_event(wev, &ngx_posted_events);

            } else {
                wev->handler(wev);
            }
        }
    }

    return NGX_OK;
}


static void *
ngx_devpoll_create_conf(ngx_cycle_t *cycle)
{
    ngx_devpoll_conf_t  *dpcf;

    dpcf = ngx_palloc(cycle->pool, sizeof(ngx_devpoll_conf_t));
    if (dpcf == NULL) {
        return NULL;
    }

    dpcf->changes = NGX_CONF_UNSET;
    dpcf->events = NGX_CONF_UNSET;

    return dpcf;
}


static char *
ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf)
{
    ngx_devpoll_conf_t *dpcf = conf;

    ngx_conf_init_uint_value(dpcf->changes, 32);
    ngx_conf_init_uint_value(dpcf->events, 32);

    return NGX_CONF_OK;
}