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view src/http/modules/ngx_http_autoindex_module.c @ 5503:d049b0ea00a3

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SSL: ssl_session_tickets directive. This adds support so it's possible to explicitly disable SSL Session Tickets. In order to have good Forward Secrecy support either the session ticket key has to be reloaded by using nginx' binary upgrade process or using an external key file and reloading the configuration. This directive adds another possibility to have good support by disabling session tickets altogether. If session tickets are enabled and the process lives for a long a time, an attacker can grab the session ticket from the process and use that to decrypt any traffic that occured during the entire lifetime of the process.
author Dirkjan Bussink <d.bussink@gmail.com>
date Fri, 10 Jan 2014 16:12:40 +0100
parents 2cfc095a607a
children 631dee7bfd4e
line wrap: on
line source


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


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


#if 0

typedef struct {
    ngx_buf_t     *buf;
    size_t         size;
    ngx_pool_t    *pool;
    size_t         alloc_size;
    ngx_chain_t  **last_out;
} ngx_http_autoindex_ctx_t;

#endif


typedef struct {
    ngx_str_t      name;
    size_t         utf_len;
    size_t         escape;
    size_t         escape_html;

    unsigned       dir:1;

    time_t         mtime;
    off_t          size;
} ngx_http_autoindex_entry_t;


typedef struct {
    ngx_flag_t     enable;
    ngx_flag_t     localtime;
    ngx_flag_t     exact_size;
} ngx_http_autoindex_loc_conf_t;


#define NGX_HTTP_AUTOINDEX_PREALLOCATE  50

#define NGX_HTTP_AUTOINDEX_NAME_LEN     50


static int ngx_libc_cdecl ngx_http_autoindex_cmp_entries(const void *one,
    const void *two);
static ngx_int_t ngx_http_autoindex_error(ngx_http_request_t *r,
    ngx_dir_t *dir, ngx_str_t *name);
static ngx_int_t ngx_http_autoindex_init(ngx_conf_t *cf);
static void *ngx_http_autoindex_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_autoindex_merge_loc_conf(ngx_conf_t *cf,
    void *parent, void *child);


static ngx_command_t  ngx_http_autoindex_commands[] = {

    { ngx_string("autoindex"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_autoindex_loc_conf_t, enable),
      NULL },

    { ngx_string("autoindex_localtime"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_autoindex_loc_conf_t, localtime),
      NULL },

    { ngx_string("autoindex_exact_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_autoindex_loc_conf_t, exact_size),
      NULL },

      ngx_null_command
};


static ngx_http_module_t  ngx_http_autoindex_module_ctx = {
    NULL,                                  /* preconfiguration */
    ngx_http_autoindex_init,               /* postconfiguration */

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

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

    ngx_http_autoindex_create_loc_conf,    /* create location configuration */
    ngx_http_autoindex_merge_loc_conf      /* merge location configuration */
};


ngx_module_t  ngx_http_autoindex_module = {
    NGX_MODULE_V1,
    &ngx_http_autoindex_module_ctx,        /* module context */
    ngx_http_autoindex_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 u_char title[] =
"<html>" CRLF
"<head><title>Index of "
;


static u_char header[] =
"</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<h1>Index of "
;

static u_char tail[] =
"</body>" CRLF
"</html>" CRLF
;


static ngx_int_t
ngx_http_autoindex_handler(ngx_http_request_t *r)
{
    u_char                         *last, *filename, scale;
    off_t                           length;
    size_t                          len, char_len, escape_html, allocated, root;
    ngx_tm_t                        tm;
    ngx_err_t                       err;
    ngx_buf_t                      *b;
    ngx_int_t                       rc, size;
    ngx_str_t                       path;
    ngx_dir_t                       dir;
    ngx_uint_t                      i, level, utf8;
    ngx_pool_t                     *pool;
    ngx_time_t                     *tp;
    ngx_chain_t                     out;
    ngx_array_t                     entries;
    ngx_http_autoindex_entry_t     *entry;
    ngx_http_autoindex_loc_conf_t  *alcf;

    static char  *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
                               "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };

    if (r->uri.data[r->uri.len - 1] != '/') {
        return NGX_DECLINED;
    }

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

    alcf = ngx_http_get_module_loc_conf(r, ngx_http_autoindex_module);

    if (!alcf->enable) {
        return NGX_DECLINED;
    }

    /* NGX_DIR_MASK_LEN is lesser than NGX_HTTP_AUTOINDEX_PREALLOCATE */

    last = ngx_http_map_uri_to_path(r, &path, &root,
                                    NGX_HTTP_AUTOINDEX_PREALLOCATE);
    if (last == NULL) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    allocated = path.len;
    path.len = last - path.data;
    if (path.len > 1) {
        path.len--;
    }
    path.data[path.len] = '\0';

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http autoindex: \"%s\"", path.data);

    if (ngx_open_dir(&path, &dir) == NGX_ERROR) {
        err = ngx_errno;

        if (err == NGX_ENOENT
            || err == NGX_ENOTDIR
            || err == NGX_ENAMETOOLONG)
        {
            level = NGX_LOG_ERR;
            rc = NGX_HTTP_NOT_FOUND;

        } else if (err == NGX_EACCES) {
            level = NGX_LOG_ERR;
            rc = NGX_HTTP_FORBIDDEN;

        } else {
            level = NGX_LOG_CRIT;
            rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        ngx_log_error(level, r->connection->log, err,
                      ngx_open_dir_n " \"%s\" failed", path.data);

        return rc;
    }

#if (NGX_SUPPRESS_WARN)

    /* MSVC thinks 'entries' may be used without having been initialized */
    ngx_memzero(&entries, sizeof(ngx_array_t));

#endif

    /* TODO: pool should be temporary pool */
    pool = r->pool;

    if (ngx_array_init(&entries, pool, 40, sizeof(ngx_http_autoindex_entry_t))
        != NGX_OK)
    {
        return ngx_http_autoindex_error(r, &dir, &path);
    }

    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.content_type_len = sizeof("text/html") - 1;
    ngx_str_set(&r->headers_out.content_type, "text/html");
    r->headers_out.content_type_lowcase = NULL;

    rc = ngx_http_send_header(r);

    if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
        if (ngx_close_dir(&dir) == NGX_ERROR) {
            ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
                          ngx_close_dir_n " \"%V\" failed", &path);
        }

        return rc;
    }

    filename = path.data;
    filename[path.len] = '/';

    if (r->headers_out.charset.len == 5
        && ngx_strncasecmp(r->headers_out.charset.data, (u_char *) "utf-8", 5)
           == 0)
    {
        utf8 = 1;

    } else {
        utf8 = 0;
    }

    for ( ;; ) {
        ngx_set_errno(0);

        if (ngx_read_dir(&dir) == NGX_ERROR) {
            err = ngx_errno;

            if (err != NGX_ENOMOREFILES) {
                ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
                              ngx_read_dir_n " \"%V\" failed", &path);
                return ngx_http_autoindex_error(r, &dir, &path);
            }

            break;
        }

        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "http autoindex file: \"%s\"", ngx_de_name(&dir));

        len = ngx_de_namelen(&dir);

        if (ngx_de_name(&dir)[0] == '.') {
            continue;
        }

        if (!dir.valid_info) {

            /* 1 byte for '/' and 1 byte for terminating '\0' */

            if (path.len + 1 + len + 1 > allocated) {
                allocated = path.len + 1 + len + 1
                                     + NGX_HTTP_AUTOINDEX_PREALLOCATE;

                filename = ngx_pnalloc(pool, allocated);
                if (filename == NULL) {
                    return ngx_http_autoindex_error(r, &dir, &path);
                }

                last = ngx_cpystrn(filename, path.data, path.len + 1);
                *last++ = '/';
            }

            ngx_cpystrn(last, ngx_de_name(&dir), len + 1);

            if (ngx_de_info(filename, &dir) == NGX_FILE_ERROR) {
                err = ngx_errno;

                if (err != NGX_ENOENT && err != NGX_ELOOP) {
                    ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
                                  ngx_de_info_n " \"%s\" failed", filename);

                    if (err == NGX_EACCES) {
                        continue;
                    }

                    return ngx_http_autoindex_error(r, &dir, &path);
                }

                if (ngx_de_link_info(filename, &dir) == NGX_FILE_ERROR) {
                    ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
                                  ngx_de_link_info_n " \"%s\" failed",
                                  filename);
                    return ngx_http_autoindex_error(r, &dir, &path);
                }
            }
        }

        entry = ngx_array_push(&entries);
        if (entry == NULL) {
            return ngx_http_autoindex_error(r, &dir, &path);
        }

        entry->name.len = len;

        entry->name.data = ngx_pnalloc(pool, len + 1);
        if (entry->name.data == NULL) {
            return ngx_http_autoindex_error(r, &dir, &path);
        }

        ngx_cpystrn(entry->name.data, ngx_de_name(&dir), len + 1);

        entry->escape = 2 * ngx_escape_uri(NULL, ngx_de_name(&dir), len,
                                           NGX_ESCAPE_URI_COMPONENT);

        entry->escape_html = ngx_escape_html(NULL, entry->name.data,
                                             entry->name.len);

        if (utf8) {
            entry->utf_len = ngx_utf8_length(entry->name.data, entry->name.len);
        } else {
            entry->utf_len = len;
        }

        entry->dir = ngx_de_is_dir(&dir);
        entry->mtime = ngx_de_mtime(&dir);
        entry->size = ngx_de_size(&dir);
    }

    if (ngx_close_dir(&dir) == NGX_ERROR) {
        ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
                      ngx_close_dir_n " \"%V\" failed", &path);
    }

    escape_html = ngx_escape_html(NULL, r->uri.data, r->uri.len);

    len = sizeof(title) - 1
          + r->uri.len + escape_html
          + sizeof(header) - 1
          + r->uri.len + escape_html
          + sizeof("</h1>") - 1
          + sizeof("<hr><pre><a href=\"../\">../</a>" CRLF) - 1
          + sizeof("</pre><hr>") - 1
          + sizeof(tail) - 1;

    entry = entries.elts;
    for (i = 0; i < entries.nelts; i++) {
        len += sizeof("<a href=\"") - 1
            + entry[i].name.len + entry[i].escape
            + 1                                          /* 1 is for "/" */
            + sizeof("\">") - 1
            + entry[i].name.len - entry[i].utf_len
            + entry[i].escape_html
            + NGX_HTTP_AUTOINDEX_NAME_LEN + sizeof("&gt;") - 2
            + sizeof("</a>") - 1
            + sizeof(" 28-Sep-1970 12:00 ") - 1
            + 20                                         /* the file size */
            + 2;
    }

    b = ngx_create_temp_buf(r->pool, len);
    if (b == NULL) {
        return NGX_ERROR;
    }

    if (entries.nelts > 1) {
        ngx_qsort(entry, (size_t) entries.nelts,
                  sizeof(ngx_http_autoindex_entry_t),
                  ngx_http_autoindex_cmp_entries);
    }

    b->last = ngx_cpymem(b->last, title, sizeof(title) - 1);

    if (escape_html) {
        b->last = (u_char *) ngx_escape_html(b->last, r->uri.data, r->uri.len);
        b->last = ngx_cpymem(b->last, header, sizeof(header) - 1);
        b->last = (u_char *) ngx_escape_html(b->last, r->uri.data, r->uri.len);

    } else {
        b->last = ngx_cpymem(b->last, r->uri.data, r->uri.len);
        b->last = ngx_cpymem(b->last, header, sizeof(header) - 1);
        b->last = ngx_cpymem(b->last, r->uri.data, r->uri.len);
    }

    b->last = ngx_cpymem(b->last, "</h1>", sizeof("</h1>") - 1);

    b->last = ngx_cpymem(b->last, "<hr><pre><a href=\"../\">../</a>" CRLF,
                         sizeof("<hr><pre><a href=\"../\">../</a>" CRLF) - 1);

    tp = ngx_timeofday();

    for (i = 0; i < entries.nelts; i++) {
        b->last = ngx_cpymem(b->last, "<a href=\"", sizeof("<a href=\"") - 1);

        if (entry[i].escape) {
            ngx_escape_uri(b->last, entry[i].name.data, entry[i].name.len,
                           NGX_ESCAPE_URI_COMPONENT);

            b->last += entry[i].name.len + entry[i].escape;

        } else {
            b->last = ngx_cpymem(b->last, entry[i].name.data,
                                 entry[i].name.len);
        }

        if (entry[i].dir) {
            *b->last++ = '/';
        }

        *b->last++ = '"';
        *b->last++ = '>';

        len = entry[i].utf_len;

        if (entry[i].name.len != len) {
            if (len > NGX_HTTP_AUTOINDEX_NAME_LEN) {
                char_len = NGX_HTTP_AUTOINDEX_NAME_LEN - 3 + 1;

            } else {
                char_len = NGX_HTTP_AUTOINDEX_NAME_LEN + 1;
            }

            last = b->last;
            b->last = ngx_utf8_cpystrn(b->last, entry[i].name.data,
                                       char_len, entry[i].name.len + 1);

            if (entry[i].escape_html) {
                b->last = (u_char *) ngx_escape_html(last, entry[i].name.data,
                                                     b->last - last);
            }

            last = b->last;

        } else {
            if (entry[i].escape_html) {
                if (len > NGX_HTTP_AUTOINDEX_NAME_LEN) {
                    char_len = NGX_HTTP_AUTOINDEX_NAME_LEN - 3;

                } else {
                    char_len = len;
                }

                b->last = (u_char *) ngx_escape_html(b->last,
                                                  entry[i].name.data, char_len);
                last = b->last;

            } else {
                b->last = ngx_cpystrn(b->last, entry[i].name.data,
                                      NGX_HTTP_AUTOINDEX_NAME_LEN + 1);
                last = b->last - 3;
            }
        }

        if (len > NGX_HTTP_AUTOINDEX_NAME_LEN) {
            b->last = ngx_cpymem(last, "..&gt;</a>", sizeof("..&gt;</a>") - 1);

        } else {
            if (entry[i].dir && NGX_HTTP_AUTOINDEX_NAME_LEN - len > 0) {
                *b->last++ = '/';
                len++;
            }

            b->last = ngx_cpymem(b->last, "</a>", sizeof("</a>") - 1);

            if (NGX_HTTP_AUTOINDEX_NAME_LEN - len > 0) {
                ngx_memset(b->last, ' ', NGX_HTTP_AUTOINDEX_NAME_LEN - len);
                b->last += NGX_HTTP_AUTOINDEX_NAME_LEN - len;
            }
        }

        *b->last++ = ' ';

        ngx_gmtime(entry[i].mtime + tp->gmtoff * 60 * alcf->localtime, &tm);

        b->last = ngx_sprintf(b->last, "%02d-%s-%d %02d:%02d ",
                              tm.ngx_tm_mday,
                              months[tm.ngx_tm_mon - 1],
                              tm.ngx_tm_year,
                              tm.ngx_tm_hour,
                              tm.ngx_tm_min);

        if (alcf->exact_size) {
            if (entry[i].dir) {
                b->last = ngx_cpymem(b->last,  "                  -",
                                     sizeof("                  -") - 1);
            } else {
                b->last = ngx_sprintf(b->last, "%19O", entry[i].size);
            }

        } else {
            if (entry[i].dir) {
                b->last = ngx_cpymem(b->last,  "      -",
                                     sizeof("      -") - 1);

            } else {
                length = entry[i].size;

                if (length > 1024 * 1024 * 1024 - 1) {
                    size = (ngx_int_t) (length / (1024 * 1024 * 1024));
                    if ((length % (1024 * 1024 * 1024))
                                                > (1024 * 1024 * 1024 / 2 - 1))
                    {
                        size++;
                    }
                    scale = 'G';

                } else if (length > 1024 * 1024 - 1) {
                    size = (ngx_int_t) (length / (1024 * 1024));
                    if ((length % (1024 * 1024)) > (1024 * 1024 / 2 - 1)) {
                        size++;
                    }
                    scale = 'M';

                } else if (length > 9999) {
                    size = (ngx_int_t) (length / 1024);
                    if (length % 1024 > 511) {
                        size++;
                    }
                    scale = 'K';

                } else {
                    size = (ngx_int_t) length;
                    scale = '\0';
                }

                if (scale) {
                    b->last = ngx_sprintf(b->last, "%6i%c", size, scale);

                } else {
                    b->last = ngx_sprintf(b->last, " %6i", size);
                }
            }
        }

        *b->last++ = CR;
        *b->last++ = LF;
    }

    /* TODO: free temporary pool */

    b->last = ngx_cpymem(b->last, "</pre><hr>", sizeof("</pre><hr>") - 1);

    b->last = ngx_cpymem(b->last, tail, sizeof(tail) - 1);

    if (r == r->main) {
        b->last_buf = 1;
    }

    b->last_in_chain = 1;

    out.buf = b;
    out.next = NULL;

    return ngx_http_output_filter(r, &out);
}


static int ngx_libc_cdecl
ngx_http_autoindex_cmp_entries(const void *one, const void *two)
{
    ngx_http_autoindex_entry_t *first = (ngx_http_autoindex_entry_t *) one;
    ngx_http_autoindex_entry_t *second = (ngx_http_autoindex_entry_t *) two;

    if (first->dir && !second->dir) {
        /* move the directories to the start */
        return -1;
    }

    if (!first->dir && second->dir) {
        /* move the directories to the start */
        return 1;
    }

    return (int) ngx_strcmp(first->name.data, second->name.data);
}


#if 0

static ngx_buf_t *
ngx_http_autoindex_alloc(ngx_http_autoindex_ctx_t *ctx, size_t size)
{
    ngx_chain_t  *cl;

    if (ctx->buf) {

        if ((size_t) (ctx->buf->end - ctx->buf->last) >= size) {
            return ctx->buf;
        }

        ctx->size += ctx->buf->last - ctx->buf->pos;
    }

    ctx->buf = ngx_create_temp_buf(ctx->pool, ctx->alloc_size);
    if (ctx->buf == NULL) {
        return NULL;
    }

    cl = ngx_alloc_chain_link(ctx->pool);
    if (cl == NULL) {
        return NULL;
    }

    cl->buf = ctx->buf;
    cl->next = NULL;

    *ctx->last_out = cl;
    ctx->last_out = &cl->next;

    return ctx->buf;
}

#endif


static ngx_int_t
ngx_http_autoindex_error(ngx_http_request_t *r, ngx_dir_t *dir, ngx_str_t *name)
{
    if (ngx_close_dir(dir) == NGX_ERROR) {
        ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
                      ngx_close_dir_n " \"%V\" failed", name);
    }

    return r->header_sent ? NGX_ERROR : NGX_HTTP_INTERNAL_SERVER_ERROR;
}


static void *
ngx_http_autoindex_create_loc_conf(ngx_conf_t *cf)
{
    ngx_http_autoindex_loc_conf_t  *conf;

    conf = ngx_palloc(cf->pool, sizeof(ngx_http_autoindex_loc_conf_t));
    if (conf == NULL) {
        return NULL;
    }

    conf->enable = NGX_CONF_UNSET;
    conf->localtime = NGX_CONF_UNSET;
    conf->exact_size = NGX_CONF_UNSET;

    return conf;
}


static char *
ngx_http_autoindex_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_http_autoindex_loc_conf_t *prev = parent;
    ngx_http_autoindex_loc_conf_t *conf = child;

    ngx_conf_merge_value(conf->enable, prev->enable, 0);
    ngx_conf_merge_value(conf->localtime, prev->localtime, 0);
    ngx_conf_merge_value(conf->exact_size, prev->exact_size, 1);

    return NGX_CONF_OK;
}


static ngx_int_t
ngx_http_autoindex_init(ngx_conf_t *cf)
{
    ngx_http_handler_pt        *h;
    ngx_http_core_main_conf_t  *cmcf;

    cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);

    h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
    if (h == NULL) {
        return NGX_ERROR;
    }

    *h = ngx_http_autoindex_handler;

    return NGX_OK;
}