1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include "apr_strings.h"
21 #define APR_WANT_STRFUNC
28 #include "ap_config.h"
30 #include "http_config.h"
31 #include "http_main.h"
33 #include "http_core.h"
34 #include "http_protocol.h"
35 #include "http_request.h" /* for sub_req_lookup_uri() */
36 #include "util_script.h"
37 #include "apr_date.h" /* For apr_date_parse_http() */
38 #include "util_ebcdic.h"
46 * Various utility functions which are common to a whole lot of
47 * script-type extensions mechanisms, and might as well be gathered
48 * in one place (if only to avoid creating inter-module dependancies
49 * where there don't have to be).
52 #define MALFORMED_MESSAGE "malformed header from script. Bad header="
53 #define MALFORMED_HEADER_LENGTH_TO_SHOW 30
55 static char *http2env(apr_pool_t *a, const char *w)
57 char *res = (char *)apr_palloc(a, sizeof("HTTP_") + strlen(w));
67 while ((c = *w++) != 0) {
68 if (!apr_isalnum(c)) {
72 *cp++ = apr_toupper(c);
80 AP_DECLARE(char **) ap_create_environment(apr_pool_t *p, apr_table_t *t)
82 const apr_array_header_t *env_arr = apr_table_elts(t);
83 const apr_table_entry_t *elts = (const apr_table_entry_t *) env_arr->elts;
84 char **env = (char **) apr_palloc(p, (env_arr->nelts + 2) * sizeof(char *));
90 if (!apr_table_get(t, "TZ")) {
93 env[j++] = apr_pstrcat(p, "TZ=", tz, NULL);
96 for (i = 0; i < env_arr->nelts; ++i) {
100 env[j] = apr_pstrcat(p, elts[i].key, "=", elts[i].val, NULL);
102 if (apr_isdigit(*whack)) {
105 while (*whack != '=') {
106 if (!apr_isalnum(*whack) && *whack != '_') {
118 AP_DECLARE(void) ap_add_common_vars(request_rec *r)
121 server_rec *s = r->server;
122 conn_rec *c = r->connection;
123 const char *rem_logname;
125 #if defined(WIN32) || defined(OS2) || defined(BEOS)
129 const apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
130 const apr_table_entry_t *hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
134 /* use a temporary apr_table_t which we'll overlap onto
135 * r->subprocess_env later
136 * (exception: if r->subprocess_env is empty at the start,
137 * write directly into it)
139 if (apr_is_empty_table(r->subprocess_env)) {
140 e = r->subprocess_env;
143 e = apr_table_make(r->pool, 25 + hdrs_arr->nelts);
146 /* First, add environment vars from headers... this is as per
147 * CGI specs, though other sorts of scripting interfaces see
151 for (i = 0; i < hdrs_arr->nelts; ++i) {
156 /* A few headers are special cased --- Authorization to prevent
157 * rogue scripts from capturing passwords; content-type and -length
158 * for no particular reason.
161 if (!strcasecmp(hdrs[i].key, "Content-type")) {
162 apr_table_addn(e, "CONTENT_TYPE", hdrs[i].val);
164 else if (!strcasecmp(hdrs[i].key, "Content-length")) {
165 apr_table_addn(e, "CONTENT_LENGTH", hdrs[i].val);
168 * You really don't want to disable this check, since it leaves you
169 * wide open to CGIs stealing passwords and people viewing them
170 * in the environment with "ps -e". But, if you must...
172 #ifndef SECURITY_HOLE_PASS_AUTHORIZATION
173 else if (!strcasecmp(hdrs[i].key, "Authorization")
174 || !strcasecmp(hdrs[i].key, "Proxy-Authorization")) {
179 apr_table_addn(e, http2env(r->pool, hdrs[i].key), hdrs[i].val);
183 if (!(env_path = getenv("PATH"))) {
184 env_path = DEFAULT_PATH;
186 apr_table_addn(e, "PATH", apr_pstrdup(r->pool, env_path));
189 if (env_temp = getenv("SystemRoot")) {
190 apr_table_addn(e, "SystemRoot", env_temp);
192 if (env_temp = getenv("COMSPEC")) {
193 apr_table_addn(e, "COMSPEC", env_temp);
195 if (env_temp = getenv("PATHEXT")) {
196 apr_table_addn(e, "PATHEXT", env_temp);
198 if (env_temp = getenv("WINDIR")) {
199 apr_table_addn(e, "WINDIR", env_temp);
204 if ((env_temp = getenv("COMSPEC")) != NULL) {
205 apr_table_addn(e, "COMSPEC", env_temp);
207 if ((env_temp = getenv("ETC")) != NULL) {
208 apr_table_addn(e, "ETC", env_temp);
210 if ((env_temp = getenv("DPATH")) != NULL) {
211 apr_table_addn(e, "DPATH", env_temp);
213 if ((env_temp = getenv("PERLLIB_PREFIX")) != NULL) {
214 apr_table_addn(e, "PERLLIB_PREFIX", env_temp);
219 if ((env_temp = getenv("LIBRARY_PATH")) != NULL) {
220 apr_table_addn(e, "LIBRARY_PATH", env_temp);
224 apr_table_addn(e, "SERVER_SIGNATURE", ap_psignature("", r));
225 apr_table_addn(e, "SERVER_SOFTWARE", ap_get_server_banner());
226 apr_table_addn(e, "SERVER_NAME",
227 ap_escape_html(r->pool, ap_get_server_name(r)));
228 apr_table_addn(e, "SERVER_ADDR", r->connection->local_ip); /* Apache */
229 apr_table_addn(e, "SERVER_PORT",
230 apr_psprintf(r->pool, "%u", ap_get_server_port(r)));
231 host = ap_get_remote_host(c, r->per_dir_config, REMOTE_HOST, NULL);
233 apr_table_addn(e, "REMOTE_HOST", host);
235 apr_table_addn(e, "REMOTE_ADDR", c->remote_ip);
236 apr_table_addn(e, "DOCUMENT_ROOT", ap_document_root(r)); /* Apache */
237 apr_table_addn(e, "SERVER_ADMIN", s->server_admin); /* Apache */
238 apr_table_addn(e, "SCRIPT_FILENAME", r->filename); /* Apache */
240 rport = c->remote_addr->port;
241 apr_table_addn(e, "REMOTE_PORT", apr_itoa(r->pool, rport));
244 apr_table_addn(e, "REMOTE_USER", r->user);
247 request_rec *back = r->prev;
251 apr_table_addn(e, "REDIRECT_REMOTE_USER", back->user);
257 if (r->ap_auth_type) {
258 apr_table_addn(e, "AUTH_TYPE", r->ap_auth_type);
260 rem_logname = ap_get_remote_logname(r);
262 apr_table_addn(e, "REMOTE_IDENT", apr_pstrdup(r->pool, rem_logname));
265 /* Apache custom error responses. If we have redirected set two new vars */
269 apr_table_addn(e, "REDIRECT_QUERY_STRING", r->prev->args);
272 apr_table_addn(e, "REDIRECT_URL", r->prev->uri);
276 if (e != r->subprocess_env) {
277 apr_table_overlap(r->subprocess_env, e, APR_OVERLAP_TABLES_SET);
281 /* This "cute" little function comes about because the path info on
282 * filenames and URLs aren't always the same. So we take the two,
283 * and find as much of the two that match as possible.
286 AP_DECLARE(int) ap_find_path_info(const char *uri, const char *path_info)
288 int lu = strlen(uri);
289 int lp = strlen(path_info);
291 while (lu-- && lp-- && uri[lu] == path_info[lp]) {
292 if (path_info[lp] == '/') {
293 while (lu && uri[lu-1] == '/') lu--;
301 while (uri[lu] != '\0' && uri[lu] != '/') {
307 /* Obtain the Request-URI from the original request-line, returning
308 * a new string from the request pool containing the URI or "".
310 static char *original_uri(request_rec *r)
314 if (r->the_request == NULL) {
315 return (char *) apr_pcalloc(r->pool, 1);
318 first = r->the_request; /* use the request-line */
320 while (*first && !apr_isspace(*first)) {
321 ++first; /* skip over the method */
323 while (apr_isspace(*first)) {
324 ++first; /* and the space(s) */
328 while (*last && !apr_isspace(*last)) {
329 ++last; /* end at next whitespace */
332 return apr_pstrmemdup(r->pool, first, last - first);
335 AP_DECLARE(void) ap_add_cgi_vars(request_rec *r)
337 apr_table_t *e = r->subprocess_env;
339 apr_table_setn(e, "GATEWAY_INTERFACE", "CGI/1.1");
340 apr_table_setn(e, "SERVER_PROTOCOL", r->protocol);
341 apr_table_setn(e, "REQUEST_METHOD", r->method);
342 apr_table_setn(e, "QUERY_STRING", r->args ? r->args : "");
343 apr_table_setn(e, "REQUEST_URI", original_uri(r));
345 /* Note that the code below special-cases scripts run from includes,
346 * because it "knows" that the sub_request has been hacked to have the
347 * args and path_info of the original request, and not any that may have
348 * come with the script URI in the include command. Ugh.
351 if (!strcmp(r->protocol, "INCLUDED")) {
352 apr_table_setn(e, "SCRIPT_NAME", r->uri);
353 if (r->path_info && *r->path_info) {
354 apr_table_setn(e, "PATH_INFO", r->path_info);
357 else if (!r->path_info || !*r->path_info) {
358 apr_table_setn(e, "SCRIPT_NAME", r->uri);
361 int path_info_start = ap_find_path_info(r->uri, r->path_info);
363 apr_table_setn(e, "SCRIPT_NAME",
364 apr_pstrndup(r->pool, r->uri, path_info_start));
366 apr_table_setn(e, "PATH_INFO", r->path_info);
369 if (r->path_info && r->path_info[0]) {
371 * To get PATH_TRANSLATED, treat PATH_INFO as a URI path.
372 * Need to re-escape it for this, since the entire URI was
373 * un-escaped before we determined where the PATH_INFO began.
377 pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info), r,
380 if (pa_req->filename) {
381 char *pt = apr_pstrcat(r->pool, pa_req->filename, pa_req->path_info,
384 /* We need to make this a real Windows path name */
385 apr_filepath_merge(&pt, "", pt, APR_FILEPATH_NATIVE, r->pool);
387 apr_table_setn(e, "PATH_TRANSLATED", pt);
389 ap_destroy_sub_req(pa_req);
394 static int set_cookie_doo_doo(void *v, const char *key, const char *val)
396 apr_table_addn(v, key, val);
400 #define HTTP_UNSET (-HTTP_OK)
402 AP_DECLARE(int) ap_scan_script_header_err_core(request_rec *r, char *buffer,
403 int (*getsfunc) (char *, int, void *),
406 char x[MAX_STRING_LEN];
409 int cgi_status = HTTP_UNSET;
411 apr_table_t *cookie_table;
416 w = buffer ? buffer : x;
418 /* temporary place to hold headers to merge in later */
419 merge = apr_table_make(r->pool, 10);
421 /* The HTTP specification says that it is legal to merge duplicate
422 * headers into one. Some browsers that support Cookies don't like
423 * merged headers and prefer that each Set-Cookie header is sent
424 * separately. Lets humour those browsers by not merging.
425 * Oh what a pain it is.
427 cookie_table = apr_table_make(r->pool, 2);
428 apr_table_do(set_cookie_doo_doo, cookie_table, r->err_headers_out, "Set-Cookie", NULL);
432 if ((*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data) == 0) {
433 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
434 "Premature end of script headers: %s",
435 apr_filepath_name_get(r->filename));
436 return HTTP_INTERNAL_SERVER_ERROR;
439 /* Delete terminal (CR?)LF */
442 /* Indeed, the host's '\n':
443 '\012' for UNIX; '\015' for MacOS; '\025' for OS/390
444 -- whatever the script generates.
446 if (p > 0 && w[p - 1] == '\n') {
447 if (p > 1 && w[p - 2] == CR) {
456 * If we've finished reading the headers, check to make sure any
457 * HTTP/1.1 conditions are met. If so, we're done; normal processing
458 * will handle the script's output. If not, just return the error.
459 * The appropriate thing to do would be to send the script process a
460 * SIGPIPE to let it know we're ignoring it, close the channel to the
461 * script process, and *then* return the failed-to-meet-condition
462 * error. Otherwise we'd be waiting for the script to finish
463 * blithering before telling the client the output was no good.
464 * However, we don't have the information to do that, so we have to
465 * leave it to an upper layer.
468 int cond_status = OK;
470 /* PR#38070: This fails because it gets confused when a
471 * CGI Status header overrides ap_meets_conditions.
473 * We can fix that by dropping ap_meets_conditions when
474 * Status has been set. Since this is the only place
475 * cgi_status gets used, let's test it explicitly.
477 * The alternative would be to ignore CGI Status when
478 * ap_meets_conditions returns anything interesting.
479 * That would be safer wrt HTTP, but would break CGI.
481 if ((cgi_status == HTTP_UNSET) && (r->method_number == M_GET)) {
482 cond_status = ap_meets_conditions(r);
484 apr_table_overlap(r->err_headers_out, merge,
485 APR_OVERLAP_TABLES_MERGE);
486 if (!apr_is_empty_table(cookie_table)) {
487 /* the cookies have already been copied to the cookie_table */
488 apr_table_unset(r->err_headers_out, "Set-Cookie");
489 r->err_headers_out = apr_table_overlay(r->pool,
490 r->err_headers_out, cookie_table);
495 /* if we see a bogus header don't ignore it. Shout and scream */
497 #if APR_CHARSET_EBCDIC
498 /* Chances are that we received an ASCII header text instead of
499 * the expected EBCDIC header lines. Try to auto-detect:
501 if (!(l = strchr(w, ':'))) {
502 int maybeASCII = 0, maybeEBCDIC = 0;
503 unsigned char *cp, native;
504 apr_size_t inbytes_left, outbytes_left;
506 for (cp = w; *cp != '\0'; ++cp) {
507 native = apr_xlate_conv_byte(ap_hdrs_from_ascii, *cp);
508 if (apr_isprint(*cp) && !apr_isprint(native))
510 if (!apr_isprint(*cp) && apr_isprint(native))
513 if (maybeASCII > maybeEBCDIC) {
514 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
515 "CGI Interface Error: Script headers apparently ASCII: (CGI = %s)",
517 inbytes_left = outbytes_left = cp - w;
518 apr_xlate_conv_buffer(ap_hdrs_from_ascii,
519 w, &inbytes_left, w, &outbytes_left);
522 #endif /*APR_CHARSET_EBCDIC*/
523 if (!(l = strchr(w, ':'))) {
524 char malformed[(sizeof MALFORMED_MESSAGE) + 1
525 + MALFORMED_HEADER_LENGTH_TO_SHOW];
527 strcpy(malformed, MALFORMED_MESSAGE);
528 strncat(malformed, w, MALFORMED_HEADER_LENGTH_TO_SHOW);
531 /* Soak up all the script output - may save an outright kill */
532 while ((*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data)) {
537 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
539 apr_filepath_name_get(r->filename));
540 return HTTP_INTERNAL_SERVER_ERROR;
544 while (*l && apr_isspace(*l)) {
548 if (!strcasecmp(w, "Content-type")) {
551 /* Nuke trailing whitespace */
553 char *endp = l + strlen(l) - 1;
554 while (endp > l && apr_isspace(*endp)) {
558 tmp = apr_pstrdup(r->pool, l);
559 ap_content_type_tolower(tmp);
560 ap_set_content_type(r, tmp);
563 * If the script returned a specific status, that's what
564 * we'll use - otherwise we assume 200 OK.
566 else if (!strcasecmp(w, "Status")) {
567 r->status = cgi_status = atoi(l);
568 r->status_line = apr_pstrdup(r->pool, l);
570 else if (!strcasecmp(w, "Location")) {
571 apr_table_set(r->headers_out, w, l);
573 else if (!strcasecmp(w, "Content-Length")) {
574 apr_table_set(r->headers_out, w, l);
576 else if (!strcasecmp(w, "Content-Range")) {
577 apr_table_set(r->headers_out, w, l);
579 else if (!strcasecmp(w, "Transfer-Encoding")) {
580 apr_table_set(r->headers_out, w, l);
582 else if (!strcasecmp(w, "ETag")) {
583 apr_table_set(r->headers_out, w, l);
586 * If the script gave us a Last-Modified header, we can't just
587 * pass it on blindly because of restrictions on future values.
589 else if (!strcasecmp(w, "Last-Modified")) {
590 ap_update_mtime(r, apr_date_parse_http(l));
591 ap_set_last_modified(r);
593 else if (!strcasecmp(w, "Set-Cookie")) {
594 apr_table_add(cookie_table, w, l);
597 apr_table_add(merge, w, l);
604 static int getsfunc_FILE(char *buf, int len, void *f)
606 return apr_file_gets(buf, len, (apr_file_t *) f) == APR_SUCCESS;
609 AP_DECLARE(int) ap_scan_script_header_err(request_rec *r, apr_file_t *f,
612 return ap_scan_script_header_err_core(r, buffer, getsfunc_FILE, f);
615 static int getsfunc_BRIGADE(char *buf, int len, void *arg)
617 apr_bucket_brigade *bb = (apr_bucket_brigade *)arg;
618 const char *dst_end = buf + len - 1; /* leave room for terminating null */
620 apr_bucket *e = APR_BRIGADE_FIRST(bb);
624 while ((dst < dst_end) && !done && !APR_BUCKET_IS_EOS(e)) {
625 const char *bucket_data;
626 apr_size_t bucket_data_len;
631 rv = apr_bucket_read(e, &bucket_data, &bucket_data_len,
633 if (rv != APR_SUCCESS || (bucket_data_len == 0)) {
637 src_end = bucket_data + bucket_data_len;
638 while ((src < src_end) && (dst < dst_end) && !done) {
642 else if (*src != '\r') {
649 apr_bucket_split(e, src - bucket_data);
651 next = APR_BUCKET_NEXT(e);
652 APR_BUCKET_REMOVE(e);
653 apr_bucket_destroy(e);
660 AP_DECLARE(int) ap_scan_script_header_err_brigade(request_rec *r,
661 apr_bucket_brigade *bb,
664 return ap_scan_script_header_err_core(r, buffer, getsfunc_BRIGADE, bb);
673 static int getsfunc_STRING(char *w, int len, void *pvastrs)
675 struct vastrs *strs = (struct vastrs*) pvastrs;
679 if (!strs->curpos || !*strs->curpos)
681 p = ap_strchr_c(strs->curpos, '\n');
685 p = ap_strchr_c(strs->curpos, '\0');
686 t = p - strs->curpos;
689 strncpy (w, strs->curpos, t);
691 if (!strs->curpos[t]) {
693 strs->curpos = va_arg(strs->args, const char *);
700 /* ap_scan_script_header_err_strs() accepts additional const char* args...
701 * each is treated as one or more header lines, and the first non-header
702 * character is returned to **arg, **data. (The first optional arg is
705 AP_DECLARE_NONSTD(int) ap_scan_script_header_err_strs(request_rec *r,
713 va_start(strs.args, termarg);
715 strs.curpos = va_arg(strs.args, char*);
716 res = ap_scan_script_header_err_core(r, buffer, getsfunc_STRING, (void *) &strs);
718 *termch = strs.curpos;
727 argstr_to_table(apr_pool_t *p, char *str, apr_table_t *parms)
733 key = apr_strtok(str, "&", &strtok_state);
735 value = strchr(key, '=');
737 *value = '\0'; /* Split the string in two */
738 value++; /* Skip passed the = */
743 ap_unescape_url(key);
744 ap_unescape_url(value);
745 apr_table_set(parms, key, value);
747 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
748 "Found query arg: %s = %s", key, value);
750 key = apr_strtok(NULL, "&", &strtok_state);
754 AP_DECLARE(void) ap_args_to_table(request_rec *r, apr_table_t **table)
756 apr_table_t *t = apr_table_make(r->pool, 10);
757 argstr_to_table(r->pool, r->args, t);