1/* 2 +----------------------------------------------------------------------+ 3 | PHP Version 7 | 4 +----------------------------------------------------------------------+ 5 | Copyright (c) 1997-2018 The PHP Group | 6 +----------------------------------------------------------------------+ 7 | This source file is subject to version 3.01 of the PHP license, | 8 | that is bundled with this package in the file LICENSE, and is | 9 | available through the world-wide-web at the following url: | 10 | http://www.php.net/license/3_01.txt | 11 | If you did not receive a copy of the PHP license and are unable to | 12 | obtain it through the world-wide-web, please send a note to | 13 | license@php.net so we can mail you a copy immediately. | 14 +----------------------------------------------------------------------+ 15 | Author: Sascha Schumann <sascha@schumann.cx> | 16 | Yasuo Ohgaki <yohgaki@ohgaki.net> | 17 +----------------------------------------------------------------------+ 18*/ 19 20/* $Id$ */ 21 22#include "php.h" 23 24#ifdef HAVE_UNISTD_H 25#include <unistd.h> 26#endif 27#ifdef HAVE_LIMITS_H 28#include <limits.h> 29#endif 30 31#include <stdio.h> 32#include <stdlib.h> 33#include <string.h> 34 35#include "SAPI.h" 36#include "php_ini.h" 37#include "php_globals.h" 38#include "php_string.h" 39#define STATE_TAG SOME_OTHER_STATE_TAG 40#include "basic_functions.h" 41#include "url.h" 42#include "html.h" 43#undef STATE_TAG 44 45#define url_scanner url_scanner_ex 46 47#include "zend_smart_str.h" 48 49static void tag_dtor(zval *zv) 50{ 51 free(Z_PTR_P(zv)); 52} 53 54static int php_ini_on_update_tags(zend_ini_entry *entry, zend_string *new_value, void *mh_arg1, void *mh_arg2, void *mh_arg3, int stage, int type) 55{ 56 url_adapt_state_ex_t *ctx; 57 char *key; 58 char *tmp; 59 char *lasts = NULL; 60 61 if (type) { 62 ctx = &BG(url_adapt_session_ex); 63 } else { 64 ctx = &BG(url_adapt_output_ex); 65 } 66 67 tmp = estrndup(ZSTR_VAL(new_value), ZSTR_LEN(new_value)); 68 69 if (ctx->tags) 70 zend_hash_destroy(ctx->tags); 71 else { 72 ctx->tags = malloc(sizeof(HashTable)); 73 if (!ctx->tags) { 74 efree(tmp); 75 return FAILURE; 76 } 77 } 78 79 zend_hash_init(ctx->tags, 0, NULL, tag_dtor, 1); 80 81 for (key = php_strtok_r(tmp, ",", &lasts); 82 key; 83 key = php_strtok_r(NULL, ",", &lasts)) { 84 char *val; 85 86 val = strchr(key, '='); 87 if (val) { 88 char *q; 89 size_t keylen; 90 91 *val++ = '\0'; 92 for (q = key; *q; q++) { 93 *q = tolower(*q); 94 } 95 keylen = q - key; 96 zend_hash_str_add_mem(ctx->tags, key, keylen, val, strlen(val)+1); 97 } 98 } 99 100 efree(tmp); 101 102 return SUCCESS; 103} 104 105static PHP_INI_MH(OnUpdateSessionTags) 106{ 107 return php_ini_on_update_tags(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage, 1); 108} 109 110static PHP_INI_MH(OnUpdateOutputTags) 111{ 112 return php_ini_on_update_tags(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage, 0); 113} 114 115static int php_ini_on_update_hosts(zend_ini_entry *entry, zend_string *new_value, void *mh_arg1, void *mh_arg2, void *mh_arg3, int stage, int type) 116{ 117 HashTable *hosts; 118 char *key; 119 char *tmp; 120 char *lasts = NULL; 121 122 if (type) { 123 hosts = &BG(url_adapt_session_hosts_ht); 124 } else { 125 hosts = &BG(url_adapt_output_hosts_ht); 126 } 127 zend_hash_clean(hosts); 128 129 /* Use user supplied host whitelist */ 130 tmp = estrndup(ZSTR_VAL(new_value), ZSTR_LEN(new_value)); 131 for (key = php_strtok_r(tmp, ",", &lasts); 132 key; 133 key = php_strtok_r(NULL, ",", &lasts)) { 134 size_t keylen; 135 zend_string *tmp_key; 136 char *q; 137 138 for (q = key; *q; q++) { 139 *q = tolower(*q); 140 } 141 keylen = q - key; 142 if (keylen > 0) { 143 tmp_key = zend_string_init(key, keylen, 0); 144 zend_hash_add_empty_element(hosts, tmp_key); 145 zend_string_release(tmp_key); 146 } 147 } 148 efree(tmp); 149 150 return SUCCESS; 151} 152 153static PHP_INI_MH(OnUpdateSessionHosts) 154{ 155 return php_ini_on_update_hosts(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage, 1); 156} 157 158static PHP_INI_MH(OnUpdateOutputHosts) 159{ 160 return php_ini_on_update_hosts(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage, 0); 161} 162 163/* FIXME: OnUpdate*Hosts cannot set default to $_SERVER['HTTP_HOST'] at startup */ 164PHP_INI_BEGIN() 165 STD_PHP_INI_ENTRY("session.trans_sid_tags", "a=href,area=href,frame=src,form=", PHP_INI_ALL, OnUpdateSessionTags, url_adapt_session_ex, php_basic_globals, basic_globals) 166 STD_PHP_INI_ENTRY("session.trans_sid_hosts", "", PHP_INI_ALL, OnUpdateSessionHosts, url_adapt_session_hosts_ht, php_basic_globals, basic_globals) 167 STD_PHP_INI_ENTRY("url_rewriter.tags", "form=", PHP_INI_ALL, OnUpdateOutputTags, url_adapt_session_ex, php_basic_globals, basic_globals) 168 STD_PHP_INI_ENTRY("url_rewriter.hosts", "", PHP_INI_ALL, OnUpdateOutputHosts, url_adapt_session_hosts_ht, php_basic_globals, basic_globals) 169PHP_INI_END() 170 171/*!re2c 172any = [\000-\377]; 173N = (any\[<]); 174alpha = [a-zA-Z]; 175alphanamespace = [a-zA-Z:]; 176alphadash = ([a-zA-Z] | "-"); 177*/ 178 179#define YYFILL(n) goto done 180#define YYCTYPE unsigned char 181#define YYCURSOR p 182#define YYLIMIT q 183#define YYMARKER r 184 185static inline void append_modified_url(smart_str *url, smart_str *dest, smart_str *url_app, const char *separator) 186{ 187 php_url *url_parts; 188 char *tmp; 189 size_t tmp_len; 190 191 smart_str_0(url); /* FIXME: Bug #70480 php_url_parse_ex() crashes by processing chars exceed len */ 192 url_parts = php_url_parse_ex(ZSTR_VAL(url->s), ZSTR_LEN(url->s)); 193 194 /* Ignore malformed URLs */ 195 if (!url_parts) { 196 smart_str_append_smart_str(dest, url); 197 return; 198 } 199 200 /* Don't modify URLs of the format "#mark" */ 201 if (url_parts->fragment && '#' == ZSTR_VAL(url->s)[0]) { 202 smart_str_append_smart_str(dest, url); 203 php_url_free(url_parts); 204 return; 205 } 206 207 /* Check protocol. Only http/https is allowed. */ 208 if (url_parts->scheme 209 && strcasecmp("http", url_parts->scheme) 210 && strcasecmp("https", url_parts->scheme)) { 211 smart_str_append_smart_str(dest, url); 212 php_url_free(url_parts); 213 return; 214 } 215 216 /* Check host whitelist. If it's not listed, do nothing. */ 217 if (url_parts->host 218 && (tmp_len = strlen(url_parts->host)) 219 && (tmp = php_strtolower(url_parts->host, tmp_len)) 220 && !zend_hash_str_find(&BG(url_adapt_session_hosts_ht), tmp, tmp_len)) { 221 smart_str_append_smart_str(dest, url); 222 php_url_free(url_parts); 223 return; 224 } 225 226 /* 227 * When URL does not have path and query string add "/?". 228 * i.e. If URL is only "?foo=bar", should not add "/?". 229 */ 230 if (!url_parts->path && !url_parts->query && !url_parts->fragment) { 231 /* URL is http://php.net or like */ 232 smart_str_append_smart_str(dest, url); 233 smart_str_appendc(dest, '/'); 234 smart_str_appendc(dest, '?'); 235 smart_str_append_smart_str(dest, url_app); 236 php_url_free(url_parts); 237 return; 238 } 239 240 if (url_parts->scheme) { 241 smart_str_appends(dest, url_parts->scheme); 242 smart_str_appends(dest, "://"); 243 } else if (*(ZSTR_VAL(url->s)) == '/' && *(ZSTR_VAL(url->s)+1) == '/') { 244 smart_str_appends(dest, "//"); 245 } 246 if (url_parts->user) { 247 smart_str_appends(dest, url_parts->user); 248 if (url_parts->pass) { 249 smart_str_appends(dest, url_parts->pass); 250 smart_str_appendc(dest, ':'); 251 } 252 smart_str_appendc(dest, '@'); 253 } 254 if (url_parts->host) { 255 smart_str_appends(dest, url_parts->host); 256 } 257 if (url_parts->port) { 258 smart_str_appendc(dest, ':'); 259 smart_str_append_unsigned(dest, (long)url_parts->port); 260 } 261 if (url_parts->path) { 262 smart_str_appends(dest, url_parts->path); 263 } 264 smart_str_appendc(dest, '?'); 265 if (url_parts->query) { 266 smart_str_appends(dest, url_parts->query); 267 smart_str_appends(dest, separator); 268 smart_str_append_smart_str(dest, url_app); 269 } else { 270 smart_str_append_smart_str(dest, url_app); 271 } 272 if (url_parts->fragment) { 273 smart_str_appendc(dest, '#'); 274 smart_str_appends(dest, url_parts->fragment); 275 } 276 php_url_free(url_parts); 277} 278 279enum { 280 TAG_NORMAL = 0, 281 TAG_FORM 282}; 283 284enum { 285 ATTR_NORMAL = 0, 286 ATTR_ACTION 287}; 288 289#undef YYFILL 290#undef YYCTYPE 291#undef YYCURSOR 292#undef YYLIMIT 293#undef YYMARKER 294 295static inline void tag_arg(url_adapt_state_ex_t *ctx, char quotes, char type) 296{ 297 char f = 0; 298 299 /* arg.s is string WITHOUT NUL. 300 To avoid partial match, NUL is added here */ 301 ZSTR_VAL(ctx->arg.s)[ZSTR_LEN(ctx->arg.s)] = '\0'; 302 if (!strcasecmp(ZSTR_VAL(ctx->arg.s), ctx->lookup_data)) { 303 f = 1; 304 } 305 306 if (quotes) { 307 smart_str_appendc(&ctx->result, type); 308 } 309 if (f) { 310 append_modified_url(&ctx->val, &ctx->result, &ctx->url_app, PG(arg_separator).output); 311 } else { 312 smart_str_append_smart_str(&ctx->result, &ctx->val); 313 } 314 if (quotes) { 315 smart_str_appendc(&ctx->result, type); 316 } 317} 318 319enum { 320 STATE_PLAIN = 0, 321 STATE_TAG, 322 STATE_NEXT_ARG, 323 STATE_ARG, 324 STATE_BEFORE_VAL, 325 STATE_VAL 326}; 327 328#define YYFILL(n) goto stop 329#define YYCTYPE unsigned char 330#define YYCURSOR xp 331#define YYLIMIT end 332#define YYMARKER q 333#define STATE ctx->state 334 335#define STD_PARA url_adapt_state_ex_t *ctx, char *start, char *YYCURSOR 336#define STD_ARGS ctx, start, xp 337 338#if SCANNER_DEBUG 339#define scdebug(x) printf x 340#else 341#define scdebug(x) 342#endif 343 344static inline void passthru(STD_PARA) 345{ 346 scdebug(("appending %d chars, starting with %c\n", YYCURSOR-start, *start)); 347 smart_str_appendl(&ctx->result, start, YYCURSOR - start); 348} 349 350 351static int check_http_host(char *target) 352{ 353 zval *host, *tmp; 354 zend_string *host_tmp; 355 char *colon; 356 357 if ((tmp = zend_hash_str_find(&EG(symbol_table), ZEND_STRL("_SERVER"))) && 358 Z_TYPE_P(tmp) == IS_ARRAY && 359 (host = zend_hash_str_find(Z_ARRVAL_P(tmp), ZEND_STRL("HTTP_HOST"))) && 360 Z_TYPE_P(host) == IS_STRING) { 361 host_tmp = zend_string_init(Z_STRVAL_P(host), Z_STRLEN_P(host), 0); 362 /* HTTP_HOST could be 'localhost:8888' etc. */ 363 colon = strchr(ZSTR_VAL(host_tmp), ':'); 364 if (colon) { 365 ZSTR_LEN(host_tmp) = colon - ZSTR_VAL(host_tmp); 366 ZSTR_VAL(host_tmp)[ZSTR_LEN(host_tmp)] = '\0'; 367 } 368 if (!strcasecmp(ZSTR_VAL(host_tmp), target)) { 369 zend_string_release(host_tmp); 370 return SUCCESS; 371 } 372 zend_string_release(host_tmp); 373 } 374 return FAILURE; 375} 376 377static int check_host_whitelist(url_adapt_state_ex_t *ctx) 378{ 379 php_url *url_parts = NULL; 380 HashTable *allowed_hosts = ctx->type ? &BG(url_adapt_session_hosts_ht) : &BG(url_adapt_output_hosts_ht); 381 382 ZEND_ASSERT(ctx->tag_type == TAG_FORM); 383 384 if (ctx->attr_val.s && ZSTR_LEN(ctx->attr_val.s)) { 385 url_parts = php_url_parse_ex(ZSTR_VAL(ctx->attr_val.s), ZSTR_LEN(ctx->attr_val.s)); 386 } else { 387 return SUCCESS; /* empty URL is valid */ 388 } 389 390 if (!url_parts) { 391 return FAILURE; 392 } 393 if (url_parts->scheme) { 394 /* Only http/https should be handled. 395 A bit hacky check this here, but saves a URL parse. */ 396 if (strcasecmp(url_parts->scheme, "http") && 397 strcasecmp(url_parts->scheme, "https")) { 398 php_url_free(url_parts); 399 return FAILURE; 400 } 401 } 402 if (!url_parts->host) { 403 php_url_free(url_parts); 404 return SUCCESS; 405 } 406 if (!zend_hash_num_elements(allowed_hosts) && 407 check_http_host(url_parts->host) == SUCCESS) { 408 php_url_free(url_parts); 409 return SUCCESS; 410 } 411 if (!zend_hash_str_find(allowed_hosts, 412 url_parts->host, 413 strlen(url_parts->host))) { 414 php_url_free(url_parts); 415 return FAILURE; 416 } 417 php_url_free(url_parts); 418 return SUCCESS; 419} 420 421/* 422 * This function appends a hidden input field after a <form>. 423 */ 424static void handle_form(STD_PARA) 425{ 426 int doit = 0; 427 428 if (ZSTR_LEN(ctx->form_app.s) > 0) { 429 switch (ZSTR_LEN(ctx->tag.s)) { 430 case sizeof("form") - 1: 431 if (!strncasecmp(ZSTR_VAL(ctx->tag.s), "form", ZSTR_LEN(ctx->tag.s)) 432 && check_host_whitelist(ctx) == SUCCESS) { 433 doit = 1; 434 } 435 break; 436 } 437 } 438 439 if (doit) { 440 smart_str_append_smart_str(&ctx->result, &ctx->form_app); 441 } 442} 443 444/* 445 * HANDLE_TAG copies the HTML Tag and checks whether we 446 * have that tag in our table. If we might modify it, 447 * we continue to scan the tag, otherwise we simply copy the complete 448 * HTML stuff to the result buffer. 449 */ 450 451static inline void handle_tag(STD_PARA) 452{ 453 int ok = 0; 454 unsigned int i; 455 456 if (ctx->tag.s) { 457 ZSTR_LEN(ctx->tag.s) = 0; 458 } 459 smart_str_appendl(&ctx->tag, start, YYCURSOR - start); 460 for (i = 0; i < ZSTR_LEN(ctx->tag.s); i++) 461 ZSTR_VAL(ctx->tag.s)[i] = tolower((int)(unsigned char)ZSTR_VAL(ctx->tag.s)[i]); 462 /* intentionally using str_find here, in case the hash value is set, but the string val is changed later */ 463 if ((ctx->lookup_data = zend_hash_str_find_ptr(ctx->tags, ZSTR_VAL(ctx->tag.s), ZSTR_LEN(ctx->tag.s))) != NULL) { 464 ok = 1; 465 if (ZSTR_LEN(ctx->tag.s) == sizeof("form")-1 466 && !strncasecmp(ZSTR_VAL(ctx->tag.s), "form", ZSTR_LEN(ctx->tag.s))) { 467 ctx->tag_type = TAG_FORM; 468 } else { 469 ctx->tag_type = TAG_NORMAL; 470 } 471 } 472 STATE = ok ? STATE_NEXT_ARG : STATE_PLAIN; 473} 474 475static inline void handle_arg(STD_PARA) 476{ 477 if (ctx->arg.s) { 478 ZSTR_LEN(ctx->arg.s) = 0; 479 } 480 smart_str_appendl(&ctx->arg, start, YYCURSOR - start); 481 if (ctx->tag_type == TAG_FORM && 482 strncasecmp(ZSTR_VAL(ctx->arg.s), "action", ZSTR_LEN(ctx->arg.s)) == 0) { 483 ctx->attr_type = ATTR_ACTION; 484 } else { 485 ctx->attr_type = ATTR_NORMAL; 486 } 487} 488 489static inline void handle_val(STD_PARA, char quotes, char type) 490{ 491 smart_str_setl(&ctx->val, start + quotes, YYCURSOR - start - quotes * 2); 492 if (ctx->tag_type == TAG_FORM && ctx->attr_type == ATTR_ACTION) { 493 smart_str_setl(&ctx->attr_val, start + quotes, YYCURSOR - start - quotes * 2); 494 } 495 tag_arg(ctx, quotes, type); 496} 497 498static inline void xx_mainloop(url_adapt_state_ex_t *ctx, const char *newdata, size_t newlen) 499{ 500 char *end, *q; 501 char *xp; 502 char *start; 503 size_t rest; 504 505 smart_str_appendl(&ctx->buf, newdata, newlen); 506 507 YYCURSOR = ZSTR_VAL(ctx->buf.s); 508 YYLIMIT = ZSTR_VAL(ctx->buf.s) + ZSTR_LEN(ctx->buf.s); 509 510 switch (STATE) { 511 case STATE_PLAIN: goto state_plain; 512 case STATE_TAG: goto state_tag; 513 case STATE_NEXT_ARG: goto state_next_arg; 514 case STATE_ARG: goto state_arg; 515 case STATE_BEFORE_VAL: goto state_before_val; 516 case STATE_VAL: goto state_val; 517 } 518 519 520state_plain_begin: 521 STATE = STATE_PLAIN; 522 523state_plain: 524 start = YYCURSOR; 525/*!re2c 526 "<" { passthru(STD_ARGS); STATE = STATE_TAG; goto state_tag; } 527 N+ { passthru(STD_ARGS); goto state_plain; } 528*/ 529 530state_tag: 531 start = YYCURSOR; 532/*!re2c 533 alphanamespace+ { handle_tag(STD_ARGS); /* Sets STATE */; passthru(STD_ARGS); if (STATE == STATE_PLAIN) goto state_plain; else goto state_next_arg; } 534 any { passthru(STD_ARGS); goto state_plain_begin; } 535*/ 536 537state_next_arg_begin: 538 STATE = STATE_NEXT_ARG; 539 540state_next_arg: 541 start = YYCURSOR; 542/*!re2c 543 [/]? [>] { passthru(STD_ARGS); handle_form(STD_ARGS); goto state_plain_begin; } 544 [ \v\r\t\n]+ { passthru(STD_ARGS); goto state_next_arg; } 545 alpha { --YYCURSOR; STATE = STATE_ARG; goto state_arg; } 546 any { passthru(STD_ARGS); goto state_plain_begin; } 547*/ 548 549state_arg: 550 start = YYCURSOR; 551/*!re2c 552 alpha alphadash* { passthru(STD_ARGS); handle_arg(STD_ARGS); STATE = STATE_BEFORE_VAL; goto state_before_val; } 553 any { passthru(STD_ARGS); STATE = STATE_NEXT_ARG; goto state_next_arg; } 554*/ 555 556state_before_val: 557 start = YYCURSOR; 558/*!re2c 559 [ ]* "=" [ ]* { passthru(STD_ARGS); STATE = STATE_VAL; goto state_val; } 560 any { --YYCURSOR; goto state_next_arg_begin; } 561*/ 562 563 564state_val: 565 start = YYCURSOR; 566/*!re2c 567 ["] (any\[">])* ["] { handle_val(STD_ARGS, 1, '"'); goto state_next_arg_begin; } 568 ['] (any\['>])* ['] { handle_val(STD_ARGS, 1, '\''); goto state_next_arg_begin; } 569 (any\[ \r\t\n>'"])+ { handle_val(STD_ARGS, 0, ' '); goto state_next_arg_begin; } 570 any { passthru(STD_ARGS); goto state_next_arg_begin; } 571*/ 572 573stop: 574 if (YYLIMIT < start) { 575 /* XXX: Crash avoidance. Need to work with reporter to figure out what goes wrong */ 576 rest = 0; 577 } else { 578 rest = YYLIMIT - start; 579 scdebug(("stopped in state %d at pos %d (%d:%c) %d\n", STATE, YYCURSOR - ctx->buf.c, *YYCURSOR, *YYCURSOR, rest)); 580 } 581 582 if (rest) memmove(ZSTR_VAL(ctx->buf.s), start, rest); 583 ZSTR_LEN(ctx->buf.s) = rest; 584} 585 586 587PHPAPI char *php_url_scanner_adapt_single_url(const char *url, size_t urllen, const char *name, const char *value, size_t *newlen, int encode) 588{ 589 char *result; 590 smart_str surl = {0}; 591 smart_str buf = {0}; 592 smart_str url_app = {0}; 593 zend_string *encoded; 594 595 smart_str_appendl(&surl, url, urllen); 596 597 if (encode) { 598 encoded = php_raw_url_encode(name, strlen(name)); 599 smart_str_appendl(&url_app, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); 600 zend_string_free(encoded); 601 } else { 602 smart_str_appends(&url_app, name); 603 } 604 smart_str_appendc(&url_app, '='); 605 if (encode) { 606 encoded = php_raw_url_encode(value, strlen(value)); 607 smart_str_appendl(&url_app, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); 608 zend_string_free(encoded); 609 } else { 610 smart_str_appends(&url_app, value); 611 } 612 613 append_modified_url(&surl, &buf, &url_app, PG(arg_separator).output); 614 615 smart_str_0(&buf); 616 if (newlen) *newlen = ZSTR_LEN(buf.s); 617 result = estrndup(ZSTR_VAL(buf.s), ZSTR_LEN(buf.s)); 618 619 smart_str_free(&url_app); 620 smart_str_free(&buf); 621 622 return result; 623} 624 625 626static char *url_adapt_ext(const char *src, size_t srclen, size_t *newlen, zend_bool do_flush, url_adapt_state_ex_t *ctx) 627{ 628 char *retval; 629 630 xx_mainloop(ctx, src, srclen); 631 632 if (!ctx->result.s) { 633 smart_str_appendl(&ctx->result, "", 0); 634 *newlen = 0; 635 } else { 636 *newlen = ZSTR_LEN(ctx->result.s); 637 } 638 smart_str_0(&ctx->result); 639 if (do_flush) { 640 smart_str_append(&ctx->result, ctx->buf.s); 641 *newlen += ZSTR_LEN(ctx->buf.s); 642 smart_str_free(&ctx->buf); 643 smart_str_free(&ctx->val); 644 smart_str_free(&ctx->attr_val); 645 } 646 retval = estrndup(ZSTR_VAL(ctx->result.s), ZSTR_LEN(ctx->result.s)); 647 smart_str_free(&ctx->result); 648 return retval; 649} 650 651static int php_url_scanner_ex_activate(int type) 652{ 653 url_adapt_state_ex_t *ctx; 654 655 if (type) { 656 ctx = &BG(url_adapt_session_ex); 657 } else { 658 ctx = &BG(url_adapt_output_ex); 659 } 660 661 memset(ctx, 0, ((size_t) &((url_adapt_state_ex_t *)0)->tags)); 662 663 return SUCCESS; 664} 665 666static int php_url_scanner_ex_deactivate(int type) 667{ 668 url_adapt_state_ex_t *ctx; 669 670 if (type) { 671 ctx = &BG(url_adapt_session_ex); 672 } else { 673 ctx = &BG(url_adapt_output_ex); 674 } 675 676 smart_str_free(&ctx->result); 677 smart_str_free(&ctx->buf); 678 smart_str_free(&ctx->tag); 679 smart_str_free(&ctx->arg); 680 smart_str_free(&ctx->attr_val); 681 682 return SUCCESS; 683} 684 685static inline void php_url_scanner_session_handler_impl(char *output, size_t output_len, char **handled_output, size_t *handled_output_len, int mode, int type) 686{ 687 size_t len; 688 url_adapt_state_ex_t *url_state; 689 690 if (type) { 691 url_state = &BG(url_adapt_session_ex); 692 } else { 693 url_state = &BG(url_adapt_output_ex); 694 } 695 696 if (ZSTR_LEN(url_state->url_app.s) != 0) { 697 *handled_output = url_adapt_ext(output, output_len, &len, (zend_bool) (mode & (PHP_OUTPUT_HANDLER_END | PHP_OUTPUT_HANDLER_CONT | PHP_OUTPUT_HANDLER_FLUSH | PHP_OUTPUT_HANDLER_FINAL) ? 1 : 0), url_state); 698 if (sizeof(uint) < sizeof(size_t)) { 699 if (len > UINT_MAX) 700 len = UINT_MAX; 701 } 702 *handled_output_len = len; 703 } else if (ZSTR_LEN(url_state->url_app.s) == 0) { 704 url_adapt_state_ex_t *ctx = url_state; 705 if (ctx->buf.s && ZSTR_LEN(ctx->buf.s)) { 706 smart_str_append(&ctx->result, ctx->buf.s); 707 smart_str_appendl(&ctx->result, output, output_len); 708 709 *handled_output = estrndup(ZSTR_VAL(ctx->result.s), ZSTR_LEN(ctx->result.s)); 710 *handled_output_len = ZSTR_LEN(ctx->buf.s) + output_len; 711 712 smart_str_free(&ctx->buf); 713 smart_str_free(&ctx->result); 714 } else { 715 *handled_output = estrndup(output, *handled_output_len = output_len); 716 } 717 } else { 718 *handled_output = NULL; 719 } 720} 721 722static void php_url_scanner_session_handler(char *output, size_t output_len, char **handled_output, size_t *handled_output_len, int mode) 723{ 724 php_url_scanner_session_handler_impl(output, output_len, handled_output, handled_output_len, mode, 1); 725} 726 727static void php_url_scanner_output_handler(char *output, size_t output_len, char **handled_output, size_t *handled_output_len, int mode) 728{ 729 php_url_scanner_session_handler_impl(output, output_len, handled_output, handled_output_len, mode, 0); 730} 731 732static inline int php_url_scanner_add_var_impl(char *name, size_t name_len, char *value, size_t value_len, int encode, int type) 733{ 734 smart_str sname = {0}; 735 smart_str svalue = {0}; 736 smart_str hname = {0}; 737 smart_str hvalue = {0}; 738 zend_string *encoded; 739 url_adapt_state_ex_t *url_state; 740 php_output_handler_func_t handler; 741 742 if (type) { 743 url_state = &BG(url_adapt_session_ex); 744 handler = php_url_scanner_session_handler; 745 } else { 746 url_state = &BG(url_adapt_output_ex); 747 handler = php_url_scanner_output_handler; 748 } 749 750 if (!url_state->active) { 751 php_url_scanner_ex_activate(type); 752 php_output_start_internal(ZEND_STRL("URL-Rewriter"), handler, 0, PHP_OUTPUT_HANDLER_STDFLAGS); 753 url_state->active = 1; 754 } 755 756 if (url_state->url_app.s && ZSTR_LEN(url_state->url_app.s) != 0) { 757 smart_str_appends(&url_state->url_app, PG(arg_separator).output); 758 } 759 760 if (encode) { 761 encoded = php_raw_url_encode(name, name_len); 762 smart_str_appendl(&sname, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); zend_string_free(encoded); 763 encoded = php_raw_url_encode(value, value_len); 764 smart_str_appendl(&svalue, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); zend_string_free(encoded); 765 encoded = php_escape_html_entities_ex((unsigned char*)name, name_len, 0, ENT_QUOTES|ENT_SUBSTITUTE, SG(default_charset), 0); 766 smart_str_appendl(&hname, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); zend_string_free(encoded); 767 encoded = php_escape_html_entities_ex((unsigned char*)value, value_len, 0, ENT_QUOTES|ENT_SUBSTITUTE, SG(default_charset), 0); 768 smart_str_appendl(&hvalue, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); zend_string_free(encoded); 769 } else { 770 smart_str_appendl(&sname, name, name_len); 771 smart_str_appendl(&svalue, value, value_len); 772 smart_str_appendl(&hname, name, name_len); 773 smart_str_appendl(&hvalue, value, value_len); 774 } 775 776 smart_str_append_smart_str(&url_state->url_app, &sname); 777 smart_str_appendc(&url_state->url_app, '='); 778 smart_str_append_smart_str(&url_state->url_app, &svalue); 779 780 smart_str_appends(&url_state->form_app, "<input type=\"hidden\" name=\""); 781 smart_str_append_smart_str(&url_state->form_app, &hname); 782 smart_str_appends(&url_state->form_app, "\" value=\""); 783 smart_str_append_smart_str(&url_state->form_app, &hvalue); 784 smart_str_appends(&url_state->form_app, "\" />"); 785 786 smart_str_free(&sname); 787 smart_str_free(&svalue); 788 smart_str_free(&hname); 789 smart_str_free(&hvalue); 790 791 return SUCCESS; 792} 793 794 795PHPAPI int php_url_scanner_add_session_var(char *name, size_t name_len, char *value, size_t value_len, int encode) 796{ 797 return php_url_scanner_add_var_impl(name, name_len, value, value_len, encode, 1); 798} 799 800 801PHPAPI int php_url_scanner_add_var(char *name, size_t name_len, char *value, size_t value_len, int encode) 802{ 803 return php_url_scanner_add_var_impl(name, name_len, value, value_len, encode, 0); 804} 805 806 807static inline void php_url_scanner_reset_vars_impl(int type) { 808 url_adapt_state_ex_t *url_state; 809 810 if (type) { 811 url_state = &BG(url_adapt_session_ex); 812 } else { 813 url_state = &BG(url_adapt_output_ex); 814 } 815 816 if (url_state->form_app.s) { 817 ZSTR_LEN(url_state->form_app.s) = 0; 818 } 819 if (url_state->url_app.s) { 820 ZSTR_LEN(url_state->url_app.s) = 0; 821 } 822} 823 824 825PHPAPI int php_url_scanner_reset_session_vars(void) 826{ 827 php_url_scanner_reset_vars_impl(1); 828 return SUCCESS; 829} 830 831 832PHPAPI int php_url_scanner_reset_vars(void) 833{ 834 php_url_scanner_reset_vars_impl(0); 835 return SUCCESS; 836} 837 838 839static inline int php_url_scanner_reset_var_impl(zend_string *name, int encode, int type) 840{ 841 char *start, *end, *limit; 842 size_t separator_len; 843 smart_str sname = {0}; 844 smart_str hname = {0}; 845 smart_str url_app = {0}; 846 smart_str form_app = {0}; 847 zend_string *encoded; 848 int ret = SUCCESS; 849 zend_bool sep_removed = 0; 850 url_adapt_state_ex_t *url_state; 851 852 if (type) { 853 url_state = &BG(url_adapt_session_ex); 854 } else { 855 url_state = &BG(url_adapt_output_ex); 856 } 857 858 /* Short circuit check. Only check url_app. */ 859 if (!url_state->url_app.s || !ZSTR_LEN(url_state->url_app.s)) { 860 return SUCCESS; 861 } 862 863 if (encode) { 864 encoded = php_raw_url_encode(ZSTR_VAL(name), ZSTR_LEN(name)); 865 smart_str_appendl(&sname, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); 866 zend_string_free(encoded); 867 encoded = php_escape_html_entities_ex((unsigned char *)ZSTR_VAL(name), ZSTR_LEN(name), 0, ENT_QUOTES|ENT_SUBSTITUTE, SG(default_charset), 0); 868 smart_str_appendl(&hname, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); 869 zend_string_free(encoded); 870 } else { 871 smart_str_appendl(&sname, ZSTR_VAL(name), ZSTR_LEN(name)); 872 smart_str_appendl(&hname, ZSTR_VAL(name), ZSTR_LEN(name)); 873 } 874 smart_str_0(&sname); 875 smart_str_0(&hname); 876 877 smart_str_append_smart_str(&url_app, &sname); 878 smart_str_appendc(&url_app, '='); 879 smart_str_0(&url_app); 880 881 smart_str_appends(&form_app, "<input type=\"hidden\" name=\""); 882 smart_str_append_smart_str(&form_app, &hname); 883 smart_str_appends(&form_app, "\" value=\""); 884 smart_str_0(&form_app); 885 886 /* Short circuit check. Only check url_app. */ 887 start = (char *) php_memnstr(ZSTR_VAL(url_state->url_app.s), 888 ZSTR_VAL(url_app.s), ZSTR_LEN(url_app.s), 889 ZSTR_VAL(url_state->url_app.s) + ZSTR_LEN(url_state->url_app.s)); 890 if (!start) { 891 ret = FAILURE; 892 goto finish; 893 } 894 895 /* Get end of url var */ 896 limit = ZSTR_VAL(url_state->url_app.s) + ZSTR_LEN(url_state->url_app.s); 897 end = start + ZSTR_LEN(url_app.s); 898 separator_len = strlen(PG(arg_separator).output); 899 while (end < limit) { 900 if (!memcmp(end, PG(arg_separator).output, separator_len)) { 901 end += separator_len; 902 sep_removed = 1; 903 break; 904 } 905 end++; 906 } 907 /* Remove all when this is the only rewrite var */ 908 if (ZSTR_LEN(url_state->url_app.s) == end - start) { 909 php_url_scanner_reset_vars_impl(type); 910 goto finish; 911 } 912 /* Check preceeding separator */ 913 if (!sep_removed 914 && start - PG(arg_separator).output >= separator_len 915 && !memcmp(start - separator_len, PG(arg_separator).output, separator_len)) { 916 start -= separator_len; 917 } 918 /* Remove partially */ 919 memmove(start, end, 920 ZSTR_LEN(url_state->url_app.s) - (end - ZSTR_VAL(url_state->url_app.s))); 921 ZSTR_LEN(url_state->url_app.s) -= end - start; 922 ZSTR_VAL(url_state->url_app.s)[ZSTR_LEN(url_state->url_app.s)] = '\0'; 923 924 /* Remove form var */ 925 start = (char *) php_memnstr(ZSTR_VAL(url_state->form_app.s), 926 ZSTR_VAL(form_app.s), ZSTR_LEN(form_app.s), 927 ZSTR_VAL(url_state->form_app.s) + ZSTR_LEN(url_state->form_app.s)); 928 if (!start) { 929 /* Should not happen */ 930 ret = FAILURE; 931 php_url_scanner_reset_vars_impl(type); 932 goto finish; 933 } 934 /* Get end of form var */ 935 limit = ZSTR_VAL(url_state->form_app.s) + ZSTR_LEN(url_state->form_app.s); 936 end = start + ZSTR_LEN(form_app.s); 937 while (end < limit) { 938 if (*end == '>') { 939 end += 1; 940 break; 941 } 942 end++; 943 } 944 /* Remove partially */ 945 memmove(start, end, 946 ZSTR_LEN(url_state->form_app.s) - (end - ZSTR_VAL(url_state->form_app.s))); 947 ZSTR_LEN(url_state->form_app.s) -= end - start; 948 ZSTR_VAL(url_state->form_app.s)[ZSTR_LEN(url_state->form_app.s)] = '\0'; 949 950finish: 951 smart_str_free(&url_app); 952 smart_str_free(&form_app); 953 smart_str_free(&sname); 954 smart_str_free(&hname); 955 return ret; 956} 957 958 959PHPAPI int php_url_scanner_reset_session_var(zend_string *name, int encode) 960{ 961 return php_url_scanner_reset_var_impl(name, encode, 1); 962} 963 964 965PHPAPI int php_url_scanner_reset_var(zend_string *name, int encode) 966{ 967 return php_url_scanner_reset_var_impl(name, encode, 0); 968} 969 970 971PHP_MINIT_FUNCTION(url_scanner) 972{ 973 REGISTER_INI_ENTRIES(); 974 return SUCCESS; 975} 976 977PHP_MSHUTDOWN_FUNCTION(url_scanner) 978{ 979 UNREGISTER_INI_ENTRIES(); 980 981 return SUCCESS; 982} 983 984PHP_RINIT_FUNCTION(url_scanner) 985{ 986 BG(url_adapt_session_ex).active = 0; 987 BG(url_adapt_session_ex).tag_type = 0; 988 BG(url_adapt_session_ex).attr_type = 0; 989 BG(url_adapt_output_ex).active = 0; 990 BG(url_adapt_output_ex).tag_type = 0; 991 BG(url_adapt_output_ex).attr_type = 0; 992 return SUCCESS; 993} 994 995PHP_RSHUTDOWN_FUNCTION(url_scanner) 996{ 997 if (BG(url_adapt_session_ex).active) { 998 php_url_scanner_ex_deactivate(1); 999 BG(url_adapt_session_ex).active = 0; 1000 BG(url_adapt_session_ex).tag_type = 0; 1001 BG(url_adapt_session_ex).attr_type = 0; 1002 } 1003 smart_str_free(&BG(url_adapt_session_ex).form_app); 1004 smart_str_free(&BG(url_adapt_session_ex).url_app); 1005 1006 if (BG(url_adapt_output_ex).active) { 1007 php_url_scanner_ex_deactivate(0); 1008 BG(url_adapt_output_ex).active = 0; 1009 BG(url_adapt_output_ex).tag_type = 0; 1010 BG(url_adapt_output_ex).attr_type = 0; 1011 } 1012 smart_str_free(&BG(url_adapt_output_ex).form_app); 1013 smart_str_free(&BG(url_adapt_output_ex).url_app); 1014 1015 return SUCCESS; 1016} 1017
