httpd/server/util_script.c

	util_script.c revision 8fdb7710b01f7d33f487ae558559c242d87eda41
6115N/A/* ====================================================================
6115N/A * The Apache Software License, Version 1.1
6115N/A *
6115N/A * Copyright (c) 2000 The Apache Software Foundation.  All rights
6115N/A * reserved.
6115N/A *
6115N/A * Redistribution and use in source and binary forms, with or without
6115N/A * modification, are permitted provided that the following conditions
6115N/A * are met:
6115N/A *
6115N/A * 1. Redistributions of source code must retain the above copyright
6115N/A *    notice, this list of conditions and the following disclaimer.
6115N/A *
6115N/A * 2. Redistributions in binary form must reproduce the above copyright
6115N/A *    notice, this list of conditions and the following disclaimer in
6115N/A *    the documentation and/or other materials provided with the
6115N/A *    distribution.
6115N/A *
6115N/A * 3. The end-user documentation included with the redistribution,
6115N/A *    if any, must include the following acknowledgment:
6115N/A *       "This product includes software developed by the
6115N/A *        Apache Software Foundation (http://www.apache.org/)."
6115N/A *    Alternately, this acknowledgment may appear in the software itself,
6115N/A *    if and wherever such third-party acknowledgments normally appear.
6115N/A *
6115N/A * 4. The names "Apache" and "Apache Software Foundation" must
6115N/A *    not be used to endorse or promote products derived from this
6115N/A *    software without prior written permission. For written
6115N/A *    permission, please contact apache@apache.org.
6115N/A *
6115N/A * 5. Products derived from this software may not be called "Apache",
6115N/A *    nor may "Apache" appear in their name, without prior written
6115N/A *    permission of the Apache Software Foundation.
6115N/A *
6115N/A * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
6115N/A * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
6115N/A * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
6115N/A * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
6115N/A * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
6115N/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
6115N/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
6115N/A * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
6115N/A * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
6115N/A * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
6115N/A * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
6115N/A * SUCH DAMAGE.
6115N/A * ====================================================================
6115N/A *
6115N/A * This software consists of voluntary contributions made by many
6115N/A * individuals on behalf of the Apache Software Foundation.  For more
6115N/A * information on the Apache Software Foundation, please see
6115N/A * <http://www.apache.org/>.
6115N/A *
6115N/A * Portions of this software are based upon public domain software
6115N/A * originally written at the National Center for Supercomputing Applications,
6115N/A * University of Illinois, Urbana-Champaign.
6115N/A */
6115N/A
6115N/A#define CORE_PRIVATE
6115N/A#include "ap_config.h"
6115N/A#include "apr_strings.h"
6115N/A#include "httpd.h"
6115N/A#include "http_config.h"
6115N/A#include "http_main.h"
6115N/A#include "http_log.h"
6115N/A#include "http_core.h"
6115N/A#include "http_protocol.h"
6115N/A#include "http_request.h"   /* for sub_req_lookup_uri() */
6115N/A#include "util_script.h"
6115N/A#include "util_date.h"      /* For parseHTTPdate() */
6115N/A#include "util_ebcdic.h"
6115N/A#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#ifdef OS2
#define INCL_DOS
#include <os2.h>
#endif

/*
 * Various utility functions which are common to a whole lot of
 * script-type extensions mechanisms, and might as well be gathered
 * in one place (if only to avoid creating inter-module dependancies
 * where there don't have to be).
 */

#define MALFORMED_MESSAGE "malformed header from script. Bad header="
#define MALFORMED_HEADER_LENGTH_TO_SHOW 30

static char *http2env(apr_pool_t *a, char *w)
{
    char *res = apr_pstrcat(a, "HTTP_", w, NULL);
    char *cp = res;

    while (*++cp) {
    if (!apr_isalnum(*cp) && *cp != '_') {
        *cp = '_';
    }
    else {
        *cp = apr_toupper(*cp);
    }
    }

    return res;
}

API_EXPORT(char **) ap_create_environment(apr_pool_t *p, apr_table_t *t)
{
    apr_array_header_t *env_arr = apr_table_elts(t);
    apr_table_entry_t *elts = (apr_table_entry_t *) env_arr->elts;
    char **env = (char **) apr_palloc(p, (env_arr->nelts + 2) * sizeof(char *));
    int i, j;
    char *tz;
    char *whack;

    j = 0;
    if (!apr_table_get(t, "TZ")) {
    tz = getenv("TZ");
    if (tz != NULL) {
        env[j++] = apr_pstrcat(p, "TZ=", tz, NULL);
    }
    }
    for (i = 0; i < env_arr->nelts; ++i) {
        if (!elts[i].key) {
        continue;
    }
    env[j] = apr_pstrcat(p, elts[i].key, "=", elts[i].val, NULL);
    whack = env[j];
    if (apr_isdigit(*whack)) {
        *whack++ = '_';
    }
    while (*whack != '=') {
        if (!apr_isalnum(*whack) && *whack != '_') {
        *whack = '_';
        }
        ++whack;
    }
    ++j;
    }

    env[j] = NULL;
    return env;
}

API_EXPORT(void) ap_add_common_vars(request_rec *r)
{
    apr_table_t *e;
    server_rec *s = r->server;
    conn_rec *c = r->connection;
    const char *rem_logname;
    char *env_path;
#if defined(WIN32) || defined(OS2)
    char *env_temp;
#endif
    const char *host;
    apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
    apr_table_entry_t *hdrs = (apr_table_entry_t *) hdrs_arr->elts;
    int i;

    /* use a temporary apr_table_t which we'll overlap onto
     * r->subprocess_env later
     */
    e = apr_make_table(r->pool, 25 + hdrs_arr->nelts);

    /* First, add environment vars from headers... this is as per
     * CGI specs, though other sorts of scripting interfaces see
     * the same vars...
     */

    for (i = 0; i < hdrs_arr->nelts; ++i) {
        if (!hdrs[i].key) {
        continue;
    }

    /* A few headers are special cased --- Authorization to prevent
     * rogue scripts from capturing passwords; content-type and -length
     * for no particular reason.
     */

    if (!strcasecmp(hdrs[i].key, "Content-type")) {
        apr_table_addn(e, "CONTENT_TYPE", hdrs[i].val);
    }
    else if (!strcasecmp(hdrs[i].key, "Content-length")) {
        apr_table_addn(e, "CONTENT_LENGTH", hdrs[i].val);
    }
    /*
     * You really don't want to disable this check, since it leaves you
     * wide open to CGIs stealing passwords and people viewing them
     * in the environment with "ps -e".  But, if you must...
     */
#ifndef SECURITY_HOLE_PASS_AUTHORIZATION
    else if (!strcasecmp(hdrs[i].key, "Authorization")
         || !strcasecmp(hdrs[i].key, "Proxy-Authorization")) {
        continue;
    }
#endif
    else {
        apr_table_addn(e, http2env(r->pool, hdrs[i].key), hdrs[i].val);
    }
    }

    if (!(env_path = getenv("PATH"))) {
    env_path = DEFAULT_PATH;
    }
    apr_table_addn(e, "PATH", apr_pstrdup(r->pool, env_path));

#ifdef WIN32
    if (env_temp = getenv("SystemRoot")) {
        apr_table_addn(e, "SystemRoot", env_temp);
    }
    if (env_temp = getenv("COMSPEC")) {
        apr_table_addn(e, "COMSPEC", env_temp);
    }
    if (env_temp = getenv("WINDIR")) {
        apr_table_addn(e, "WINDIR", env_temp);
    }
#endif

#ifdef OS2
    if ((env_temp = getenv("COMSPEC")) != NULL) {
        apr_table_addn(e, "COMSPEC", env_temp);
    }
    if ((env_temp = getenv("ETC")) != NULL) {
        apr_table_addn(e, "ETC", env_temp);
    }
    if ((env_temp = getenv("DPATH")) != NULL) {
        apr_table_addn(e, "DPATH", env_temp);
    }
    if ((env_temp = getenv("PERLLIB_PREFIX")) != NULL) {
        apr_table_addn(e, "PERLLIB_PREFIX", env_temp);
    }
#endif

    apr_table_addn(e, "SERVER_SIGNATURE", ap_psignature("", r));
    apr_table_addn(e, "SERVER_SOFTWARE", ap_get_server_version());
    apr_table_addn(e, "SERVER_NAME", ap_get_server_name(r));
    apr_table_addn(e, "SERVER_ADDR", r->connection->local_ip);  /* Apache */
    apr_table_addn(e, "SERVER_PORT",
          apr_psprintf(r->pool, "%u", ap_get_server_port(r)));
    host = ap_get_remote_host(c, r->per_dir_config, REMOTE_HOST);
    if (host) {
    apr_table_addn(e, "REMOTE_HOST", host);
    }
    apr_table_addn(e, "REMOTE_ADDR", c->remote_ip);
    apr_table_addn(e, "DOCUMENT_ROOT", ap_document_root(r));    /* Apache */
    apr_table_addn(e, "SERVER_ADMIN", s->server_admin); /* Apache */
    apr_table_addn(e, "SCRIPT_FILENAME", r->filename);  /* Apache */

    apr_table_addn(e, "REMOTE_PORT",
          apr_psprintf(r->pool, "%d", ntohs(c->remote_addr.sin_port)));

    if (r->user) {
    apr_table_addn(e, "REMOTE_USER", r->user);
    }
    if (r->ap_auth_type) {
    apr_table_addn(e, "AUTH_TYPE", r->ap_auth_type);
    }
    rem_logname = ap_get_remote_logname(r);
    if (rem_logname) {
    apr_table_addn(e, "REMOTE_IDENT", apr_pstrdup(r->pool, rem_logname));
    }

    /* Apache custom error responses. If we have redirected set two new vars */

    if (r->prev) {
        if (r->prev->args) {
        apr_table_addn(e, "REDIRECT_QUERY_STRING", r->prev->args);
    }
    if (r->prev->uri) {
        apr_table_addn(e, "REDIRECT_URL", r->prev->uri);
    }
    }

    apr_overlap_tables(r->subprocess_env, e, APR_OVERLAP_TABLES_SET);
}

/* This "cute" little function comes about because the path info on
 * filenames and URLs aren't always the same. So we take the two,
 * and find as much of the two that match as possible.
 */

API_EXPORT(int) ap_find_path_info(const char *uri, const char *path_info)
{
    int lu = strlen(uri);
    int lp = strlen(path_info);

    while (lu-- && lp-- && uri[lu] == path_info[lp]);

    if (lu == -1) {
    lu = 0;
    }

    while (uri[lu] != '\0' && uri[lu] != '/') {
        lu++;
    }
    return lu;
}

/* Obtain the Request-URI from the original request-line, returning
 * a new string from the request pool containing the URI or "".
 */
static char *original_uri(request_rec *r)
{
    char *first, *last;

    if (r->the_request == NULL) {
    return (char *) apr_pcalloc(r->pool, 1);
    }

    first = r->the_request; /* use the request-line */

    while (*first && !apr_isspace(*first)) {
    ++first;        /* skip over the method */
    }
    while (apr_isspace(*first)) {
    ++first;        /*   and the space(s)   */
    }

    last = first;
    while (*last && !apr_isspace(*last)) {
    ++last;         /* end at next whitespace */
    }

    return apr_pstrndup(r->pool, first, last - first);
}

API_EXPORT(void) ap_add_cgi_vars(request_rec *r)
{
    apr_table_t *e = r->subprocess_env;

    apr_table_setn(e, "GATEWAY_INTERFACE", "CGI/1.1");
    apr_table_setn(e, "SERVER_PROTOCOL", r->protocol);
    apr_table_setn(e, "REQUEST_METHOD", r->method);
    apr_table_setn(e, "QUERY_STRING", r->args ? r->args : "");
    apr_table_setn(e, "REQUEST_URI", original_uri(r));

    /* Note that the code below special-cases scripts run from includes,
     * because it "knows" that the sub_request has been hacked to have the
     * args and path_info of the original request, and not any that may have
     * come with the script URI in the include command.  Ugh.
     */

    if (!strcmp(r->protocol, "INCLUDED")) {
    apr_table_setn(e, "SCRIPT_NAME", r->uri);
    if (r->path_info && *r->path_info) {
        apr_table_setn(e, "PATH_INFO", r->path_info);
    }
    }
    else if (!r->path_info || !*r->path_info) {
    apr_table_setn(e, "SCRIPT_NAME", r->uri);
    }
    else {
    int path_info_start = ap_find_path_info(r->uri, r->path_info);

    apr_table_setn(e, "SCRIPT_NAME",
              apr_pstrndup(r->pool, r->uri, path_info_start));

    apr_table_setn(e, "PATH_INFO", r->path_info);
    }

    if (r->path_info && r->path_info[0]) {
    /*
     * To get PATH_TRANSLATED, treat PATH_INFO as a URI path.
     * Need to re-escape it for this, since the entire URI was
     * un-escaped before we determined where the PATH_INFO began.
     */
    request_rec *pa_req;

    pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info), r);

    if (pa_req->filename) {
#ifdef WIN32
        char buffer[HUGE_STRING_LEN];
#endif
        char *pt = apr_pstrcat(r->pool, pa_req->filename, pa_req->path_info,
                  NULL);
#ifdef WIN32
        /* We need to make this a real Windows path name */
        GetFullPathName(pt, HUGE_STRING_LEN, buffer, NULL);
        apr_table_setn(e, "PATH_TRANSLATED", apr_pstrdup(r->pool, buffer));
#else
        apr_table_setn(e, "PATH_TRANSLATED", pt);
#endif
    }
    ap_destroy_sub_req(pa_req);
    }
}


static int set_cookie_doo_doo(void *v, const char *key, const char *val)
{
    apr_table_addn(v, key, val);
    return 1;
}

API_EXPORT(int) ap_scan_script_header_err_core(request_rec *r, char *buffer,
                       int (*getsfunc) (char *, int, void *),
                       void *getsfunc_data)
{
    char x[MAX_STRING_LEN];
    char *w, *l;
    int p;
    int cgi_status = HTTP_OK;
    apr_table_t *merge;
    apr_table_t *cookie_table;

    if (buffer) {
    *buffer = '\0';
    }
    w = buffer ? buffer : x;

    /* temporary place to hold headers to merge in later */
    merge = apr_make_table(r->pool, 10);

    /* The HTTP specification says that it is legal to merge duplicate
     * headers into one.  Some browsers that support Cookies don't like
     * merged headers and prefer that each Set-Cookie header is sent
     * separately.  Lets humour those browsers by not merging.
     * Oh what a pain it is.
     */
    cookie_table = apr_make_table(r->pool, 2);
    apr_table_do(set_cookie_doo_doo, cookie_table, r->err_headers_out, "Set-Cookie", NULL);

    while (1) {

    if ((*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data) == 0) {
        ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
              "Premature end of script headers: %s", r->filename);
        return HTTP_INTERNAL_SERVER_ERROR;
    }

    /* Delete terminal (CR?)LF */

    p = strlen(w);
         /* Indeed, the host's '\n':
            '\012' for UNIX; '\015' for MacOS; '\025' for OS/390
             -- whatever the script generates.
         */
    if (p > 0 && w[p - 1] == '\n') {
        if (p > 1 && w[p - 2] == CR) {
        w[p - 2] = '\0';
        }
        else {
        w[p - 1] = '\0';
        }
    }

    /*
     * If we've finished reading the headers, check to make sure any
     * HTTP/1.1 conditions are met.  If so, we're done; normal processing
     * will handle the script's output.  If not, just return the error.
     * The appropriate thing to do would be to send the script process a
     * SIGPIPE to let it know we're ignoring it, close the channel to the
     * script process, and *then* return the failed-to-meet-condition
     * error.  Otherwise we'd be waiting for the script to finish
     * blithering before telling the client the output was no good.
     * However, we don't have the information to do that, so we have to
     * leave it to an upper layer.
     */
    if (w[0] == '\0') {
        int cond_status = OK;

        if ((cgi_status == HTTP_OK) && (r->method_number == M_GET)) {
        cond_status = ap_meets_conditions(r);
        }
        apr_overlap_tables(r->err_headers_out, merge,
        APR_OVERLAP_TABLES_MERGE);
        if (!apr_is_empty_table(cookie_table)) {
        /* the cookies have already been copied to the cookie_table */
        apr_table_unset(r->err_headers_out, "Set-Cookie");
        r->err_headers_out = apr_overlay_tables(r->pool,
            r->err_headers_out, cookie_table);
        }
        return cond_status;
    }

    /* if we see a bogus header don't ignore it. Shout and scream */

#ifdef CHARSET_EBCDIC
        /* Chances are that we received an ASCII header text instead of
         * the expected EBCDIC header lines. Try to auto-detect:
         */
    if (!(l = strchr(w, ':'))) {
        int maybeASCII = 0, maybeEBCDIC = 0;
        unsigned char *cp, native;
            apr_size_t inbytes_left, outbytes_left;

        for (cp = w; *cp != '\0'; ++cp) {
                native = apr_xlate_conv_byte(ap_hdrs_from_ascii, *cp);
        if (isprint(*cp) && !isprint(native))
            ++maybeEBCDIC;
        if (!isprint(*cp) && isprint(native))
            ++maybeASCII;
            }
        if (maybeASCII > maybeEBCDIC) {
        ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r->server,
                             "CGI Interface Error: Script headers apparently ASCII: (CGI = %s)",
                             r->filename);
                inbytes_left = outbytes_left = cp - w;
                apr_xlate_conv_buffer(ap_hdrs_from_ascii,
                                      w, &inbytes_left, w, &outbytes_left);
        }
    }
#endif /*CHARSET_EBCDIC*/
    if (!(l = strchr(w, ':'))) {
        char malformed[(sizeof MALFORMED_MESSAGE) + 1
               + MALFORMED_HEADER_LENGTH_TO_SHOW];

        strcpy(malformed, MALFORMED_MESSAGE);
        strncat(malformed, w, MALFORMED_HEADER_LENGTH_TO_SHOW);

        if (!buffer) {
        /* Soak up all the script output - may save an outright kill */
            while ((*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data)) {
            continue;
        }
        }

        ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
              "%s: %s", malformed, r->filename);
        return HTTP_INTERNAL_SERVER_ERROR;
    }

    *l++ = '\0';
    while (*l && apr_isspace(*l)) {
        ++l;
    }

    if (!strcasecmp(w, "Content-type")) {
        char *tmp;

        /* Nuke trailing whitespace */

        char *endp = l + strlen(l) - 1;
        while (endp > l && apr_isspace(*endp)) {
        *endp-- = '\0';
        }

        tmp = apr_pstrdup(r->pool, l);
        ap_content_type_tolower(tmp);
        r->content_type = tmp;
    }
    /*
     * If the script returned a specific status, that's what
     * we'll use - otherwise we assume 200 OK.
     */
    else if (!strcasecmp(w, "Status")) {
        r->status = cgi_status = atoi(l);
        r->status_line = apr_pstrdup(r->pool, l);
    }
    else if (!strcasecmp(w, "Location")) {
        apr_table_set(r->headers_out, w, l);
    }
    else if (!strcasecmp(w, "Content-Length")) {
        apr_table_set(r->headers_out, w, l);
    }
    else if (!strcasecmp(w, "Transfer-Encoding")) {
        apr_table_set(r->headers_out, w, l);
    }
    /*
     * If the script gave us a Last-Modified header, we can't just
     * pass it on blindly because of restrictions on future values.
     */
    else if (!strcasecmp(w, "Last-Modified")) {
        ap_update_mtime(r, ap_parseHTTPdate(l));
        ap_set_last_modified(r);
    }
    else if (!strcasecmp(w, "Set-Cookie")) {
        apr_table_add(cookie_table, w, l);
    }
    else {
        apr_table_add(merge, w, l);
    }
    }
}

static int getsfunc_FILE(char *buf, int len, void *f)
{
    return apr_fgets(buf, len, (apr_file_t *) f) == APR_SUCCESS;
}

API_EXPORT(int) ap_scan_script_header_err(request_rec *r, apr_file_t *f,
                      char *buffer)
{
    return ap_scan_script_header_err_core(r, buffer, getsfunc_FILE, f);
}

struct vastrs {
    va_list args;
    int arg;
    const char *curpos;
};

static int getsfunc_STRING(char *w, int len, void *pvastrs)
{
    struct vastrs *strs = (struct vastrs*) pvastrs;
    const char *p;
    int t;

    if (!strs->curpos || !*strs->curpos)
        return 0;
    p = ap_strchr_c(strs->curpos, '\n');
    if (p)
        ++p;
    else
        p = ap_strchr_c(strs->curpos, '\0');
    t = p - strs->curpos;
    if (t > len)
        t = len;
    strncpy (w, strs->curpos, t);
    w[t] = '\0';
    if (!strs->curpos[t]) {
        ++strs->arg;
        strs->curpos = va_arg(strs->args, const char *);
    }
    else
        strs->curpos += t;
    return t;
}

/* ap_scan_script_header_err_strs() accepts additional const char* args...
 * each is treated as one or more header lines, and the first non-header
 * character is returned to **arg, **data.  (The first optional arg is
 * counted as 0.)
 */
API_EXPORT_NONSTD(int) ap_scan_script_header_err_strs(request_rec *r,
                                                      char *buffer,
                                                      const char **termch,
                                                      int *termarg, ...)
{
    struct vastrs strs;
    int res;

    va_start(strs.args, termarg);
    strs.arg = 0;
    strs.curpos = va_arg(strs.args, char*);
    res = ap_scan_script_header_err_core(r, buffer, getsfunc_STRING, (void *) &strs);
    if (termch)
        *termch = strs.curpos;
    if (termarg)
        *termarg = strs.arg;
    va_end(strs.args);
    return res;
}

API_EXPORT(void) ap_send_size(apr_ssize_t size, request_rec *r)
{
    /* XXX: this -1 thing is a gross hack */
    if (size == (apr_ssize_t)-1) {
    ap_rputs("    -", r);
    }
    else if (!size) {
    ap_rputs("   0k", r);
    }
    else if (size < 1024) {
    ap_rputs("   1k", r);
    }
    else if (size < 1048576) {
    ap_rprintf(r, "%4" APR_SSIZE_T_FMT "k", (size + 512) / 1024);
    }
    else if (size < 103809024) {
    ap_rprintf(r, "%4.1fM", size / 1048576.0);
    }
    else {
    ap_rprintf(r, "%4" APR_SSIZE_T_FMT "M", (size + 524288) / 1048576);
    }
}