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view src/http/modules/ngx_http_empty_gif_module.c @ 7629:f47f7d3d1bfa

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Mp4: fixed possible chunk offset overflow. In "co64" atom chunk start offset is a 64-bit unsigned integer. When trimming the "mdat" atom, chunk offsets are casted to off_t values which are typically 64-bit signed integers. A specially crafted mp4 file with huge chunk offsets may lead to off_t overflow and result in negative trim boundaries. The consequences of the overflow are: - Incorrect Content-Length header value in the response. - Negative left boundary of the response file buffer holding the trimmed "mdat". This leads to pread()/sendfile() errors followed by closing the client connection. On rare systems where off_t is a 32-bit integer, this scenario is also feasible with the "stco" atom. The fix is to add checks which make sure data chunks referenced by each track are within the mp4 file boundaries. Additionally a few more checks are added to ensure mp4 file consistency and log errors.
author Roman Arutyunyan <arut@nginx.com>
date Wed, 26 Feb 2020 15:10:46 +0300
parents d620f497c50f
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */

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


static char *ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);

static ngx_command_t  ngx_http_empty_gif_commands[] = {

    { ngx_string("empty_gif"),
      NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
      ngx_http_empty_gif,
      0,
      0,
      NULL },

      ngx_null_command
};


/* the minimal single pixel transparent GIF, 43 bytes */

static u_char  ngx_empty_gif[] = {

    'G', 'I', 'F', '8', '9', 'a',  /* header                                 */

                                   /* logical screen descriptor              */
    0x01, 0x00,                    /* logical screen width                   */
    0x01, 0x00,                    /* logical screen height                  */
    0x80,                          /* global 1-bit color table               */
    0x01,                          /* background color #1                    */
    0x00,                          /* no aspect ratio                        */

                                   /* global color table                     */
    0x00, 0x00, 0x00,              /* #0: black                              */
    0xff, 0xff, 0xff,              /* #1: white                              */

                                   /* graphic control extension              */
    0x21,                          /* extension introducer                   */
    0xf9,                          /* graphic control label                  */
    0x04,                          /* block size                             */
    0x01,                          /* transparent color is given,            */
                                   /*     no disposal specified,             */
                                   /*     user input is not expected         */
    0x00, 0x00,                    /* delay time                             */
    0x01,                          /* transparent color #1                   */
    0x00,                          /* block terminator                       */

                                   /* image descriptor                       */
    0x2c,                          /* image separator                        */
    0x00, 0x00,                    /* image left position                    */
    0x00, 0x00,                    /* image top position                     */
    0x01, 0x00,                    /* image width                            */
    0x01, 0x00,                    /* image height                           */
    0x00,                          /* no local color table, no interlaced    */

                                   /* table based image data                 */
    0x02,                          /* LZW minimum code size,                 */
                                   /*     must be at least 2-bit             */
    0x02,                          /* block size                             */
    0x4c, 0x01,                    /* compressed bytes 01_001_100, 0000000_1 */
                                   /* 100: clear code                        */
                                   /* 001: 1                                 */
                                   /* 101: end of information code           */
    0x00,                          /* block terminator                       */

    0x3B                           /* trailer                                */
};


static ngx_http_module_t  ngx_http_empty_gif_module_ctx = {
    NULL,                          /* preconfiguration */
    NULL,                          /* postconfiguration */

    NULL,                          /* create main configuration */
    NULL,                          /* init main configuration */

    NULL,                          /* create server configuration */
    NULL,                          /* merge server configuration */

    NULL,                          /* create location configuration */
    NULL                           /* merge location configuration */
};


ngx_module_t  ngx_http_empty_gif_module = {
    NGX_MODULE_V1,
    &ngx_http_empty_gif_module_ctx, /* module context */
    ngx_http_empty_gif_commands,   /* module directives */
    NGX_HTTP_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_str_t  ngx_http_gif_type = ngx_string("image/gif");


static ngx_int_t
ngx_http_empty_gif_handler(ngx_http_request_t *r)
{
    ngx_http_complex_value_t  cv;

    if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) {
        return NGX_HTTP_NOT_ALLOWED;
    }

    ngx_memzero(&cv, sizeof(ngx_http_complex_value_t));

    cv.value.len = sizeof(ngx_empty_gif);
    cv.value.data = ngx_empty_gif;
    r->headers_out.last_modified_time = 23349600;

    return ngx_http_send_response(r, NGX_HTTP_OK, &ngx_http_gif_type, &cv);
}


static char *
ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_core_loc_conf_t  *clcf;

    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
    clcf->handler = ngx_http_empty_gif_handler;

    return NGX_CONF_OK;
}