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 APLOG_USE_MODULE(core);
57 static char *http2env(apr_pool_t *a, const char *w)
59 char *res = (char *)apr_palloc(a, sizeof("HTTP_") + strlen(w));
69 while ((c = *w++) != 0) {
71 *cp++ = apr_toupper(c);
85 static void add_unless_null(apr_table_t *table, const char *name, const char *val)
88 apr_table_addn(table, name, val);
92 static void env2env(apr_table_t *table, const char *name)
94 add_unless_null(table, name, getenv(name));
97 AP_DECLARE(char **) ap_create_environment(apr_pool_t *p, apr_table_t *t)
99 const apr_array_header_t *env_arr = apr_table_elts(t);
100 const apr_table_entry_t *elts = (const apr_table_entry_t *) env_arr->elts;
101 char **env = (char **) apr_palloc(p, (env_arr->nelts + 2) * sizeof(char *));
107 if (!apr_table_get(t, "TZ")) {
110 env[j++] = apr_pstrcat(p, "TZ=", tz, NULL);
113 for (i = 0; i < env_arr->nelts; ++i) {
117 env[j] = apr_pstrcat(p, elts[i].key, "=", elts[i].val, NULL);
119 if (apr_isdigit(*whack)) {
122 while (*whack != '=') {
123 if (!apr_isalnum(*whack) && *whack != '_') {
135 AP_DECLARE(void) ap_add_common_vars(request_rec *r)
138 server_rec *s = r->server;
139 conn_rec *c = r->connection;
140 const char *env_temp;
141 const apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
142 const apr_table_entry_t *hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
146 /* use a temporary apr_table_t which we'll overlap onto
147 * r->subprocess_env later
148 * (exception: if r->subprocess_env is empty at the start,
149 * write directly into it)
151 if (apr_is_empty_table(r->subprocess_env)) {
152 e = r->subprocess_env;
155 e = apr_table_make(r->pool, 25 + hdrs_arr->nelts);
158 /* First, add environment vars from headers... this is as per
159 * CGI specs, though other sorts of scripting interfaces see
163 for (i = 0; i < hdrs_arr->nelts; ++i) {
168 /* A few headers are special cased --- Authorization to prevent
169 * rogue scripts from capturing passwords; content-type and -length
170 * for no particular reason.
173 if (!strcasecmp(hdrs[i].key, "Content-type")) {
174 apr_table_addn(e, "CONTENT_TYPE", hdrs[i].val);
176 else if (!strcasecmp(hdrs[i].key, "Content-length")) {
177 apr_table_addn(e, "CONTENT_LENGTH", hdrs[i].val);
180 * You really don't want to disable this check, since it leaves you
181 * wide open to CGIs stealing passwords and people viewing them
182 * in the environment with "ps -e". But, if you must...
184 #ifndef SECURITY_HOLE_PASS_AUTHORIZATION
185 else if (!strcasecmp(hdrs[i].key, "Authorization")
186 || !strcasecmp(hdrs[i].key, "Proxy-Authorization")) {
191 add_unless_null(e, http2env(r->pool, hdrs[i].key), hdrs[i].val);
194 env_temp = apr_table_get(r->subprocess_env, "PATH");
195 if (env_temp == NULL) {
196 env_temp = getenv("PATH");
198 if (env_temp == NULL) {
199 env_temp = DEFAULT_PATH;
201 apr_table_addn(e, "PATH", apr_pstrdup(r->pool, env_temp));
204 env2env(e, "SystemRoot");
205 env2env(e, "COMSPEC");
206 env2env(e, "PATHEXT");
207 env2env(e, "WINDIR");
209 env2env(e, "COMSPEC");
212 env2env(e, "PERLLIB_PREFIX");
214 env2env(e, "LIBRARY_PATH");
215 #elif defined(DARWIN)
216 env2env(e, "DYLD_LIBRARY_PATH");
218 env2env(e, "LIBPATH");
219 #elif defined(__HPUX__)
220 /* HPUX PARISC 2.0W knows both, otherwise redundancy is harmless */
221 env2env(e, "SHLIB_PATH");
222 env2env(e, "LD_LIBRARY_PATH");
223 #else /* Some Unix */
224 env2env(e, "LD_LIBRARY_PATH");
227 apr_table_addn(e, "SERVER_SIGNATURE", ap_psignature("", r));
228 apr_table_addn(e, "SERVER_SOFTWARE", ap_get_server_banner());
229 apr_table_addn(e, "SERVER_NAME",
230 ap_escape_html(r->pool, ap_get_server_name(r)));
231 apr_table_addn(e, "SERVER_ADDR", r->connection->local_ip); /* Apache */
232 apr_table_addn(e, "SERVER_PORT",
233 apr_psprintf(r->pool, "%u", ap_get_server_port(r)));
234 add_unless_null(e, "REMOTE_HOST",
235 ap_get_remote_host(c, r->per_dir_config, REMOTE_HOST, NULL));
236 apr_table_addn(e, "REMOTE_ADDR", c->remote_ip);
237 apr_table_addn(e, "DOCUMENT_ROOT", ap_document_root(r)); /* Apache */
238 apr_table_addn(e, "SERVER_ADMIN", s->server_admin); /* Apache */
239 apr_table_addn(e, "SCRIPT_FILENAME", r->filename); /* Apache */
241 rport = c->remote_addr->port;
242 apr_table_addn(e, "REMOTE_PORT", apr_itoa(r->pool, rport));
245 apr_table_addn(e, "REMOTE_USER", r->user);
248 request_rec *back = r->prev;
252 apr_table_addn(e, "REDIRECT_REMOTE_USER", back->user);
258 add_unless_null(e, "AUTH_TYPE", r->ap_auth_type);
259 env_temp = ap_get_remote_logname(r);
261 apr_table_addn(e, "REMOTE_IDENT", apr_pstrdup(r->pool, env_temp));
264 /* Apache custom error responses. If we have redirected set two new vars */
267 add_unless_null(e, "REDIRECT_QUERY_STRING", r->prev->args);
268 add_unless_null(e, "REDIRECT_URL", r->prev->uri);
271 if (e != r->subprocess_env) {
272 apr_table_overlap(r->subprocess_env, e, APR_OVERLAP_TABLES_SET);
276 /* This "cute" little function comes about because the path info on
277 * filenames and URLs aren't always the same. So we take the two,
278 * and find as much of the two that match as possible.
281 AP_DECLARE(int) ap_find_path_info(const char *uri, const char *path_info)
283 int lu = strlen(uri);
284 int lp = strlen(path_info);
286 while (lu-- && lp-- && uri[lu] == path_info[lp]) {
287 if (path_info[lp] == '/') {
288 while (lu && uri[lu-1] == '/') lu--;
296 while (uri[lu] != '\0' && uri[lu] != '/') {
302 /* Obtain the Request-URI from the original request-line, returning
303 * a new string from the request pool containing the URI or "".
305 static char *original_uri(request_rec *r)
309 if (r->the_request == NULL) {
310 return (char *) apr_pcalloc(r->pool, 1);
313 first = r->the_request; /* use the request-line */
315 while (*first && !apr_isspace(*first)) {
316 ++first; /* skip over the method */
318 while (apr_isspace(*first)) {
319 ++first; /* and the space(s) */
323 while (*last && !apr_isspace(*last)) {
324 ++last; /* end at next whitespace */
327 return apr_pstrmemdup(r->pool, first, last - first);
330 AP_DECLARE(void) ap_add_cgi_vars(request_rec *r)
332 apr_table_t *e = r->subprocess_env;
334 apr_table_setn(e, "GATEWAY_INTERFACE", "CGI/1.1");
335 apr_table_setn(e, "SERVER_PROTOCOL", r->protocol);
336 apr_table_setn(e, "REQUEST_METHOD", r->method);
337 apr_table_setn(e, "QUERY_STRING", r->args ? r->args : "");
338 apr_table_setn(e, "REQUEST_URI", original_uri(r));
340 /* Note that the code below special-cases scripts run from includes,
341 * because it "knows" that the sub_request has been hacked to have the
342 * args and path_info of the original request, and not any that may have
343 * come with the script URI in the include command. Ugh.
346 if (!strcmp(r->protocol, "INCLUDED")) {
347 apr_table_setn(e, "SCRIPT_NAME", r->uri);
348 if (r->path_info && *r->path_info) {
349 apr_table_setn(e, "PATH_INFO", r->path_info);
352 else if (!r->path_info || !*r->path_info) {
353 apr_table_setn(e, "SCRIPT_NAME", r->uri);
356 int path_info_start = ap_find_path_info(r->uri, r->path_info);
358 apr_table_setn(e, "SCRIPT_NAME",
359 apr_pstrndup(r->pool, r->uri, path_info_start));
361 apr_table_setn(e, "PATH_INFO", r->path_info);
364 if (r->path_info && r->path_info[0]) {
366 * To get PATH_TRANSLATED, treat PATH_INFO as a URI path.
367 * Need to re-escape it for this, since the entire URI was
368 * un-escaped before we determined where the PATH_INFO began.
372 pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info), r,
375 if (pa_req->filename) {
376 char *pt = apr_pstrcat(r->pool, pa_req->filename, pa_req->path_info,
379 /* We need to make this a real Windows path name */
380 apr_filepath_merge(&pt, "", pt, APR_FILEPATH_NATIVE, r->pool);
382 apr_table_setn(e, "PATH_TRANSLATED", pt);
384 ap_destroy_sub_req(pa_req);
389 static int set_cookie_doo_doo(void *v, const char *key, const char *val)
391 apr_table_addn(v, key, val);
395 #define HTTP_UNSET (-HTTP_OK)
397 AP_DECLARE(int) ap_scan_script_header_err_core(request_rec *r, char *buffer,
398 int (*getsfunc) (char *, int, void *),
401 char x[MAX_STRING_LEN];
404 int cgi_status = HTTP_UNSET;
406 apr_table_t *cookie_table;
411 w = buffer ? buffer : x;
413 /* temporary place to hold headers to merge in later */
414 merge = apr_table_make(r->pool, 10);
416 /* The HTTP specification says that it is legal to merge duplicate
417 * headers into one. Some browsers that support Cookies don't like
418 * merged headers and prefer that each Set-Cookie header is sent
419 * separately. Lets humour those browsers by not merging.
420 * Oh what a pain it is.
422 cookie_table = apr_table_make(r->pool, 2);
423 apr_table_do(set_cookie_doo_doo, cookie_table, r->err_headers_out, "Set-Cookie", NULL);
427 int rv = (*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data);
429 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
430 "Premature end of script headers: %s",
431 apr_filepath_name_get(r->filename));
432 return HTTP_INTERNAL_SERVER_ERROR;
435 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
436 "Script timed out before returning headers: %s",
437 apr_filepath_name_get(r->filename));
438 return HTTP_GATEWAY_TIME_OUT;
441 /* Delete terminal (CR?)LF */
444 /* Indeed, the host's '\n':
445 '\012' for UNIX; '\015' for MacOS; '\025' for OS/390
446 -- whatever the script generates.
448 if (p > 0 && w[p - 1] == '\n') {
449 if (p > 1 && w[p - 2] == CR) {
458 * If we've finished reading the headers, check to make sure any
459 * HTTP/1.1 conditions are met. If so, we're done; normal processing
460 * will handle the script's output. If not, just return the error.
461 * The appropriate thing to do would be to send the script process a
462 * SIGPIPE to let it know we're ignoring it, close the channel to the
463 * script process, and *then* return the failed-to-meet-condition
464 * error. Otherwise we'd be waiting for the script to finish
465 * blithering before telling the client the output was no good.
466 * However, we don't have the information to do that, so we have to
467 * leave it to an upper layer.
470 int cond_status = OK;
472 /* PR#38070: This fails because it gets confused when a
473 * CGI Status header overrides ap_meets_conditions.
475 * We can fix that by dropping ap_meets_conditions when
476 * Status has been set. Since this is the only place
477 * cgi_status gets used, let's test it explicitly.
479 * The alternative would be to ignore CGI Status when
480 * ap_meets_conditions returns anything interesting.
481 * That would be safer wrt HTTP, but would break CGI.
483 if ((cgi_status == HTTP_UNSET) && (r->method_number == M_GET)) {
484 cond_status = ap_meets_conditions(r);
486 apr_table_overlap(r->err_headers_out, merge,
487 APR_OVERLAP_TABLES_MERGE);
488 if (!apr_is_empty_table(cookie_table)) {
489 /* the cookies have already been copied to the cookie_table */
490 apr_table_unset(r->err_headers_out, "Set-Cookie");
491 r->err_headers_out = apr_table_overlay(r->pool,
492 r->err_headers_out, cookie_table);
497 /* if we see a bogus header don't ignore it. Shout and scream */
499 #if APR_CHARSET_EBCDIC
500 /* Chances are that we received an ASCII header text instead of
501 * the expected EBCDIC header lines. Try to auto-detect:
503 if (!(l = strchr(w, ':'))) {
504 int maybeASCII = 0, maybeEBCDIC = 0;
505 unsigned char *cp, native;
506 apr_size_t inbytes_left, outbytes_left;
508 for (cp = w; *cp != '\0'; ++cp) {
509 native = apr_xlate_conv_byte(ap_hdrs_from_ascii, *cp);
510 if (apr_isprint(*cp) && !apr_isprint(native))
512 if (!apr_isprint(*cp) && apr_isprint(native))
515 if (maybeASCII > maybeEBCDIC) {
516 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
517 "CGI Interface Error: Script headers apparently ASCII: (CGI = %s)",
519 inbytes_left = outbytes_left = cp - w;
520 apr_xlate_conv_buffer(ap_hdrs_from_ascii,
521 w, &inbytes_left, w, &outbytes_left);
524 #endif /*APR_CHARSET_EBCDIC*/
525 if (!(l = strchr(w, ':'))) {
526 char malformed[(sizeof MALFORMED_MESSAGE) + 1
527 + MALFORMED_HEADER_LENGTH_TO_SHOW];
529 strcpy(malformed, MALFORMED_MESSAGE);
530 strncat(malformed, w, MALFORMED_HEADER_LENGTH_TO_SHOW);
533 /* Soak up all the script output - may save an outright kill */
534 while ((*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data)) {
539 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, 0, r,
541 apr_filepath_name_get(r->filename));
542 return HTTP_INTERNAL_SERVER_ERROR;
546 while (*l && apr_isspace(*l)) {
550 if (!strcasecmp(w, "Content-type")) {
553 /* Nuke trailing whitespace */
555 char *endp = l + strlen(l) - 1;
556 while (endp > l && apr_isspace(*endp)) {
560 tmp = apr_pstrdup(r->pool, l);
561 ap_content_type_tolower(tmp);
562 ap_set_content_type(r, tmp);
565 * If the script returned a specific status, that's what
566 * we'll use - otherwise we assume 200 OK.
568 else if (!strcasecmp(w, "Status")) {
569 r->status = cgi_status = atoi(l);
570 r->status_line = apr_pstrdup(r->pool, l);
572 else if (!strcasecmp(w, "Location")) {
573 apr_table_set(r->headers_out, w, l);
575 else if (!strcasecmp(w, "Content-Length")) {
576 apr_table_set(r->headers_out, w, l);
578 else if (!strcasecmp(w, "Content-Range")) {
579 apr_table_set(r->headers_out, w, l);
581 else if (!strcasecmp(w, "Transfer-Encoding")) {
582 apr_table_set(r->headers_out, w, l);
584 else if (!strcasecmp(w, "ETag")) {
585 apr_table_set(r->headers_out, w, l);
588 * If the script gave us a Last-Modified header, we can't just
589 * pass it on blindly because of restrictions on future values.
591 else if (!strcasecmp(w, "Last-Modified")) {
592 ap_update_mtime(r, apr_date_parse_http(l));
593 ap_set_last_modified(r);
595 else if (!strcasecmp(w, "Set-Cookie")) {
596 apr_table_add(cookie_table, w, l);
599 apr_table_add(merge, w, l);
602 /* never reached - we leave this function within the while loop above */
606 static int getsfunc_FILE(char *buf, int len, void *f)
608 return apr_file_gets(buf, len, (apr_file_t *) f) == APR_SUCCESS;
611 AP_DECLARE(int) ap_scan_script_header_err(request_rec *r, apr_file_t *f,
614 return ap_scan_script_header_err_core(r, buffer, getsfunc_FILE, f);
617 static int getsfunc_BRIGADE(char *buf, int len, void *arg)
619 apr_bucket_brigade *bb = (apr_bucket_brigade *)arg;
620 const char *dst_end = buf + len - 1; /* leave room for terminating null */
622 apr_bucket *e = APR_BRIGADE_FIRST(bb);
626 while ((dst < dst_end) && !done && !APR_BUCKET_IS_EOS(e)) {
627 const char *bucket_data;
628 apr_size_t bucket_data_len;
633 rv = apr_bucket_read(e, &bucket_data, &bucket_data_len,
635 if (rv != APR_SUCCESS || (bucket_data_len == 0)) {
636 return APR_STATUS_IS_TIMEUP(rv) ? -1 : 0;
639 src_end = bucket_data + bucket_data_len;
640 while ((src < src_end) && (dst < dst_end) && !done) {
644 else if (*src != '\r') {
651 apr_bucket_split(e, src - bucket_data);
653 next = APR_BUCKET_NEXT(e);
654 APR_BUCKET_REMOVE(e);
655 apr_bucket_destroy(e);
662 AP_DECLARE(int) ap_scan_script_header_err_brigade(request_rec *r,
663 apr_bucket_brigade *bb,
666 return ap_scan_script_header_err_core(r, buffer, getsfunc_BRIGADE, bb);
675 static int getsfunc_STRING(char *w, int len, void *pvastrs)
677 struct vastrs *strs = (struct vastrs*) pvastrs;
681 if (!strs->curpos || !*strs->curpos)
683 p = ap_strchr_c(strs->curpos, '\n');
687 p = ap_strchr_c(strs->curpos, '\0');
688 t = p - strs->curpos;
691 strncpy (w, strs->curpos, t);
693 if (!strs->curpos[t]) {
695 strs->curpos = va_arg(strs->args, const char *);
702 /* ap_scan_script_header_err_strs() accepts additional const char* args...
703 * each is treated as one or more header lines, and the first non-header
704 * character is returned to **arg, **data. (The first optional arg is
707 AP_DECLARE_NONSTD(int) ap_scan_script_header_err_strs(request_rec *r,
715 va_start(strs.args, termarg);
717 strs.curpos = va_arg(strs.args, char*);
718 res = ap_scan_script_header_err_core(r, buffer, getsfunc_STRING, (void *) &strs);
720 *termch = strs.curpos;
729 argstr_to_table(char *str, apr_table_t *parms)
739 key = apr_strtok(str, "&", &strtok_state);
741 value = strchr(key, '=');
743 *value = '\0'; /* Split the string in two */
744 value++; /* Skip passed the = */
749 ap_unescape_url(key);
750 ap_unescape_url(value);
751 apr_table_set(parms, key, value);
752 key = apr_strtok(NULL, "&", &strtok_state);
756 AP_DECLARE(void) ap_args_to_table(request_rec *r, apr_table_t **table)
758 apr_table_t *t = apr_table_make(r->pool, 10);
759 argstr_to_table(apr_pstrdup(r->pool, r->args), t);