1/* 2 +----------------------------------------------------------------------+ 3 | Copyright (c) The PHP Group | 4 +----------------------------------------------------------------------+ 5 | This source file is subject to version 3.01 of the PHP license, | 6 | that is bundled with this package in the file LICENSE, and is | 7 | available through the world-wide-web at the following url: | 8 | https://www.php.net/license/3_01.txt | 9 | If you did not receive a copy of the PHP license and are unable to | 10 | obtain it through the world-wide-web, please send a note to | 11 | license@php.net so we can mail you a copy immediately. | 12 +----------------------------------------------------------------------+ 13 | Author: Sascha Schumann <sascha@schumann.cx> | 14 | Yasuo Ohgaki <yohgaki@ohgaki.net> | 15 +----------------------------------------------------------------------+ 16*/ 17 18#include "php.h" 19 20#ifdef HAVE_UNISTD_H 21#include <unistd.h> 22#endif 23 24#include <limits.h> 25#include <stdio.h> 26#include <stdlib.h> 27#include <string.h> 28 29#include "SAPI.h" 30#include "php_ini.h" 31#include "php_globals.h" 32#include "php_string.h" 33#define STATE_TAG SOME_OTHER_STATE_TAG 34#include "basic_functions.h" 35#include "url.h" 36#include "html.h" 37#undef STATE_TAG 38 39#define url_scanner url_scanner_ex 40 41#include "zend_smart_str.h" 42 43static void tag_dtor(zval *zv) 44{ 45 free(Z_PTR_P(zv)); 46} 47 48static 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) 49{ 50 url_adapt_state_ex_t *ctx; 51 char *key; 52 char *tmp; 53 char *lasts = NULL; 54 55 if (type) { 56 ctx = &BG(url_adapt_session_ex); 57 } else { 58 ctx = &BG(url_adapt_output_ex); 59 } 60 61 tmp = estrndup(ZSTR_VAL(new_value), ZSTR_LEN(new_value)); 62 63 if (ctx->tags) 64 zend_hash_destroy(ctx->tags); 65 else { 66 ctx->tags = malloc(sizeof(HashTable)); 67 if (!ctx->tags) { 68 efree(tmp); 69 return FAILURE; 70 } 71 } 72 73 zend_hash_init(ctx->tags, 0, NULL, tag_dtor, 1); 74 75 for (key = php_strtok_r(tmp, ",", &lasts); 76 key; 77 key = php_strtok_r(NULL, ",", &lasts)) { 78 char *val; 79 80 val = strchr(key, '='); 81 if (val) { 82 char *q; 83 size_t keylen; 84 zend_string *str; 85 86 *val++ = '\0'; 87 for (q = key; *q; q++) { 88 *q = tolower(*q); 89 } 90 keylen = q - key; 91 str = zend_string_init(key, keylen, 1); 92 GC_MAKE_PERSISTENT_LOCAL(str); 93 zend_hash_add_mem(ctx->tags, str, val, strlen(val)+1); 94 zend_string_release_ex(str, 1); 95 } 96 } 97 98 efree(tmp); 99 100 return SUCCESS; 101} 102 103static PHP_INI_MH(OnUpdateSessionTags) 104{ 105 return php_ini_on_update_tags(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage, 1); 106} 107 108static PHP_INI_MH(OnUpdateOutputTags) 109{ 110 return php_ini_on_update_tags(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage, 0); 111} 112 113static 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) 114{ 115 HashTable *hosts; 116 char *key; 117 char *tmp; 118 char *lasts = NULL; 119 120 if (type) { 121 hosts = &BG(url_adapt_session_hosts_ht); 122 } else { 123 hosts = &BG(url_adapt_output_hosts_ht); 124 } 125 zend_hash_clean(hosts); 126 127 /* Use user supplied host whitelist */ 128 tmp = estrndup(ZSTR_VAL(new_value), ZSTR_LEN(new_value)); 129 for (key = php_strtok_r(tmp, ",", &lasts); 130 key; 131 key = php_strtok_r(NULL, ",", &lasts)) { 132 size_t keylen; 133 zend_string *tmp_key; 134 char *q; 135 136 for (q = key; *q; q++) { 137 *q = tolower(*q); 138 } 139 keylen = q - key; 140 if (keylen > 0) { 141 /* Note: the hash table is persistently allocated, so the strings must be too! */ 142 tmp_key = zend_string_init(key, keylen, true); 143 GC_MAKE_PERSISTENT_LOCAL(tmp_key); 144 zend_hash_add_empty_element(hosts, tmp_key); 145 zend_string_release_ex(tmp_key, true); 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; 188 189 smart_str_0(url); /* FIXME: Bug #70480 php_url_parse_ex() crashes by processing chars exceed len */ 190 url_parts = php_url_parse_ex(ZSTR_VAL(url->s), ZSTR_LEN(url->s)); 191 192 /* Ignore malformed URLs */ 193 if (!url_parts) { 194 smart_str_append_smart_str(dest, url); 195 return; 196 } 197 198 /* Don't modify URLs of the format "#mark" */ 199 if (url_parts->fragment && '#' == ZSTR_VAL(url->s)[0]) { 200 smart_str_append_smart_str(dest, url); 201 php_url_free(url_parts); 202 return; 203 } 204 205 /* Check protocol. Only http/https is allowed. */ 206 if (url_parts->scheme 207 && !zend_string_equals_literal_ci(url_parts->scheme, "http") 208 && !zend_string_equals_literal_ci(url_parts->scheme, "https")) { 209 smart_str_append_smart_str(dest, url); 210 php_url_free(url_parts); 211 return; 212 } 213 214 /* Check host whitelist. If it's not listed, do nothing. */ 215 if (url_parts->host) { 216 zend_string *tmp = zend_string_tolower(url_parts->host); 217 if (!zend_hash_exists(&BG(url_adapt_session_hosts_ht), tmp)) { 218 zend_string_release_ex(tmp, 0); 219 smart_str_append_smart_str(dest, url); 220 php_url_free(url_parts); 221 return; 222 } 223 zend_string_release_ex(tmp, 0); 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, ZSTR_VAL(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, ZSTR_VAL(url_parts->user)); 248 if (url_parts->pass) { 249 smart_str_appends(dest, ZSTR_VAL(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, ZSTR_VAL(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, ZSTR_VAL(url_parts->path)); 263 } 264 smart_str_appendc(dest, '?'); 265 if (url_parts->query) { 266 smart_str_appends(dest, ZSTR_VAL(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, ZSTR_VAL(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#ifdef 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_find(&EG(symbol_table), ZSTR_KNOWN(ZEND_STR_AUTOGLOBAL_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_ex(host_tmp, 0); 370 return SUCCESS; 371 } 372 zend_string_release_ex(host_tmp, 0); 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 (!zend_string_equals_literal_ci(url_parts->scheme, "http") && 397 !zend_string_equals_literal_ci(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(ZSTR_VAL(url_parts->host)) == SUCCESS) { 408 php_url_free(url_parts); 409 return SUCCESS; 410 } 411 if (!zend_hash_find(allowed_hosts, url_parts->host)) { 412 php_url_free(url_parts); 413 return FAILURE; 414 } 415 php_url_free(url_parts); 416 return SUCCESS; 417} 418 419/* 420 * This function appends a hidden input field after a <form>. 421 */ 422static void handle_form(STD_PARA) 423{ 424 int doit = 0; 425 426 if (ZSTR_LEN(ctx->form_app.s) > 0) { 427 switch (ZSTR_LEN(ctx->tag.s)) { 428 case sizeof("form") - 1: 429 if (!strncasecmp(ZSTR_VAL(ctx->tag.s), "form", ZSTR_LEN(ctx->tag.s)) 430 && check_host_whitelist(ctx) == SUCCESS) { 431 doit = 1; 432 } 433 break; 434 } 435 } 436 437 if (doit) { 438 smart_str_append_smart_str(&ctx->result, &ctx->form_app); 439 } 440} 441 442/* 443 * HANDLE_TAG copies the HTML Tag and checks whether we 444 * have that tag in our table. If we might modify it, 445 * we continue to scan the tag, otherwise we simply copy the complete 446 * HTML stuff to the result buffer. 447 */ 448 449static inline void handle_tag(STD_PARA) 450{ 451 int ok = 0; 452 unsigned int i; 453 454 if (ctx->tag.s) { 455 ZSTR_LEN(ctx->tag.s) = 0; 456 } 457 smart_str_appendl(&ctx->tag, start, YYCURSOR - start); 458 for (i = 0; i < ZSTR_LEN(ctx->tag.s); i++) 459 ZSTR_VAL(ctx->tag.s)[i] = tolower((int)(unsigned char)ZSTR_VAL(ctx->tag.s)[i]); 460 /* intentionally using str_find here, in case the hash value is set, but the string val is changed later */ 461 if ((ctx->lookup_data = zend_hash_str_find_ptr(ctx->tags, ZSTR_VAL(ctx->tag.s), ZSTR_LEN(ctx->tag.s))) != NULL) { 462 ok = 1; 463 if (ZSTR_LEN(ctx->tag.s) == sizeof("form")-1 464 && !strncasecmp(ZSTR_VAL(ctx->tag.s), "form", ZSTR_LEN(ctx->tag.s))) { 465 ctx->tag_type = TAG_FORM; 466 } else { 467 ctx->tag_type = TAG_NORMAL; 468 } 469 } 470 STATE = ok ? STATE_NEXT_ARG : STATE_PLAIN; 471} 472 473static inline void handle_arg(STD_PARA) 474{ 475 if (ctx->arg.s) { 476 ZSTR_LEN(ctx->arg.s) = 0; 477 } 478 smart_str_appendl(&ctx->arg, start, YYCURSOR - start); 479 if (ctx->tag_type == TAG_FORM && 480 strncasecmp(ZSTR_VAL(ctx->arg.s), "action", ZSTR_LEN(ctx->arg.s)) == 0) { 481 ctx->attr_type = ATTR_ACTION; 482 } else { 483 ctx->attr_type = ATTR_NORMAL; 484 } 485} 486 487static inline void handle_val(STD_PARA, char quotes, char type) 488{ 489 smart_str_setl(&ctx->val, start + quotes, YYCURSOR - start - quotes * 2); 490 if (ctx->tag_type == TAG_FORM && ctx->attr_type == ATTR_ACTION) { 491 smart_str_setl(&ctx->attr_val, start + quotes, YYCURSOR - start - quotes * 2); 492 } 493 tag_arg(ctx, quotes, type); 494} 495 496static inline void xx_mainloop(url_adapt_state_ex_t *ctx, const char *newdata, size_t newlen) 497{ 498 char *end, *q; 499 char *xp; 500 char *start; 501 size_t rest; 502 503 smart_str_appendl(&ctx->buf, newdata, newlen); 504 505 YYCURSOR = ZSTR_VAL(ctx->buf.s); 506 YYLIMIT = ZSTR_VAL(ctx->buf.s) + ZSTR_LEN(ctx->buf.s); 507 508 switch (STATE) { 509 case STATE_PLAIN: goto state_plain; 510 case STATE_TAG: goto state_tag; 511 case STATE_NEXT_ARG: goto state_next_arg; 512 case STATE_ARG: goto state_arg; 513 case STATE_BEFORE_VAL: goto state_before_val; 514 case STATE_VAL: goto state_val; 515 } 516 517 518state_plain_begin: 519 STATE = STATE_PLAIN; 520 521state_plain: 522 start = YYCURSOR; 523/*!re2c 524 "<" { passthru(STD_ARGS); STATE = STATE_TAG; goto state_tag; } 525 N+ { passthru(STD_ARGS); goto state_plain; } 526*/ 527 528state_tag: 529 start = YYCURSOR; 530/*!re2c 531 alphanamespace+ { handle_tag(STD_ARGS); /* Sets STATE */; passthru(STD_ARGS); if (STATE == STATE_PLAIN) goto state_plain; else goto state_next_arg; } 532 any { passthru(STD_ARGS); goto state_plain_begin; } 533*/ 534 535state_next_arg_begin: 536 STATE = STATE_NEXT_ARG; 537 538state_next_arg: 539 start = YYCURSOR; 540/*!re2c 541 [/]? [>] { passthru(STD_ARGS); handle_form(STD_ARGS); goto state_plain_begin; } 542 [ \v\r\t\n]+ { passthru(STD_ARGS); goto state_next_arg; } 543 alpha { --YYCURSOR; STATE = STATE_ARG; goto state_arg; } 544 any { passthru(STD_ARGS); goto state_plain_begin; } 545*/ 546 547state_arg: 548 start = YYCURSOR; 549/*!re2c 550 alpha alphadash* { passthru(STD_ARGS); handle_arg(STD_ARGS); STATE = STATE_BEFORE_VAL; goto state_before_val; } 551 any { passthru(STD_ARGS); STATE = STATE_NEXT_ARG; goto state_next_arg; } 552*/ 553 554state_before_val: 555 start = YYCURSOR; 556/*!re2c 557 [ ]* "=" [ ]* { passthru(STD_ARGS); STATE = STATE_VAL; goto state_val; } 558 any { --YYCURSOR; goto state_next_arg_begin; } 559*/ 560 561 562state_val: 563 start = YYCURSOR; 564/*!re2c 565 ["] (any\[">])* ["] { handle_val(STD_ARGS, 1, '"'); goto state_next_arg_begin; } 566 ['] (any\['>])* ['] { handle_val(STD_ARGS, 1, '\''); goto state_next_arg_begin; } 567 (any\[ \r\t\n>'"])+ { handle_val(STD_ARGS, 0, ' '); goto state_next_arg_begin; } 568 any { passthru(STD_ARGS); goto state_next_arg_begin; } 569*/ 570 571stop: 572 if (YYLIMIT < start) { 573 /* XXX: Crash avoidance. Need to work with reporter to figure out what goes wrong */ 574 rest = 0; 575 } else { 576 rest = YYLIMIT - start; 577 scdebug(("stopped in state %d at pos %d (%d:%c) %d\n", STATE, YYCURSOR - ctx->buf.c, *YYCURSOR, *YYCURSOR, rest)); 578 } 579 580 if (rest) memmove(ZSTR_VAL(ctx->buf.s), start, rest); 581 ZSTR_LEN(ctx->buf.s) = rest; 582} 583 584 585PHPAPI char *php_url_scanner_adapt_single_url(const char *url, size_t urllen, const char *name, const char *value, size_t *newlen, int encode) 586{ 587 char *result; 588 smart_str surl = {0}; 589 smart_str buf = {0}; 590 smart_str url_app = {0}; 591 zend_string *encoded; 592 593 smart_str_appendl(&surl, url, urllen); 594 595 if (encode) { 596 encoded = php_raw_url_encode(name, strlen(name)); 597 smart_str_appendl(&url_app, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); 598 zend_string_free(encoded); 599 } else { 600 smart_str_appends(&url_app, name); 601 } 602 smart_str_appendc(&url_app, '='); 603 if (encode) { 604 encoded = php_raw_url_encode(value, strlen(value)); 605 smart_str_appendl(&url_app, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); 606 zend_string_free(encoded); 607 } else { 608 smart_str_appends(&url_app, value); 609 } 610 611 append_modified_url(&surl, &buf, &url_app, PG(arg_separator).output); 612 613 smart_str_0(&buf); 614 if (newlen) *newlen = ZSTR_LEN(buf.s); 615 result = estrndup(ZSTR_VAL(buf.s), ZSTR_LEN(buf.s)); 616 617 smart_str_free(&url_app); 618 smart_str_free(&buf); 619 620 return result; 621} 622 623 624static char *url_adapt_ext(const char *src, size_t srclen, size_t *newlen, bool do_flush, url_adapt_state_ex_t *ctx) 625{ 626 char *retval; 627 628 xx_mainloop(ctx, src, srclen); 629 630 if (!ctx->result.s) { 631 smart_str_appendl(&ctx->result, "", 0); 632 *newlen = 0; 633 } else { 634 *newlen = ZSTR_LEN(ctx->result.s); 635 } 636 smart_str_0(&ctx->result); 637 if (do_flush) { 638 smart_str_append(&ctx->result, ctx->buf.s); 639 *newlen += ZSTR_LEN(ctx->buf.s); 640 smart_str_free(&ctx->buf); 641 smart_str_free(&ctx->val); 642 smart_str_free(&ctx->attr_val); 643 } 644 retval = estrndup(ZSTR_VAL(ctx->result.s), ZSTR_LEN(ctx->result.s)); 645 smart_str_free(&ctx->result); 646 return retval; 647} 648 649static int php_url_scanner_ex_activate(int type) 650{ 651 url_adapt_state_ex_t *ctx; 652 653 if (type) { 654 ctx = &BG(url_adapt_session_ex); 655 } else { 656 ctx = &BG(url_adapt_output_ex); 657 } 658 659 memset(ctx, 0, XtOffsetOf(url_adapt_state_ex_t, tags)); 660 661 return SUCCESS; 662} 663 664static int php_url_scanner_ex_deactivate(int type) 665{ 666 url_adapt_state_ex_t *ctx; 667 668 if (type) { 669 ctx = &BG(url_adapt_session_ex); 670 } else { 671 ctx = &BG(url_adapt_output_ex); 672 } 673 674 smart_str_free(&ctx->result); 675 smart_str_free(&ctx->buf); 676 smart_str_free(&ctx->tag); 677 smart_str_free(&ctx->arg); 678 smart_str_free(&ctx->attr_val); 679 680 return SUCCESS; 681} 682 683static 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) 684{ 685 size_t len; 686 url_adapt_state_ex_t *url_state; 687 688 if (type) { 689 url_state = &BG(url_adapt_session_ex); 690 } else { 691 url_state = &BG(url_adapt_output_ex); 692 } 693 694 if (ZSTR_LEN(url_state->url_app.s) != 0) { 695 *handled_output = url_adapt_ext(output, output_len, &len, (bool) (mode & (PHP_OUTPUT_HANDLER_END | PHP_OUTPUT_HANDLER_CONT | PHP_OUTPUT_HANDLER_FLUSH | PHP_OUTPUT_HANDLER_FINAL) ? 1 : 0), url_state); 696 if (sizeof(unsigned int) < sizeof(size_t)) { 697 if (len > UINT_MAX) 698 len = UINT_MAX; 699 } 700 *handled_output_len = len; 701 } else if (ZSTR_LEN(url_state->url_app.s) == 0) { 702 url_adapt_state_ex_t *ctx = url_state; 703 if (ctx->buf.s && ZSTR_LEN(ctx->buf.s)) { 704 smart_str_append(&ctx->result, ctx->buf.s); 705 smart_str_appendl(&ctx->result, output, output_len); 706 707 *handled_output = estrndup(ZSTR_VAL(ctx->result.s), ZSTR_LEN(ctx->result.s)); 708 *handled_output_len = ZSTR_LEN(ctx->buf.s) + output_len; 709 710 smart_str_free(&ctx->buf); 711 smart_str_free(&ctx->result); 712 } else { 713 *handled_output = estrndup(output, *handled_output_len = output_len); 714 } 715 } else { 716 *handled_output = NULL; 717 } 718} 719 720static void php_url_scanner_session_handler(char *output, size_t output_len, char **handled_output, size_t *handled_output_len, int mode) 721{ 722 php_url_scanner_session_handler_impl(output, output_len, handled_output, handled_output_len, mode, 1); 723} 724 725static void php_url_scanner_output_handler(char *output, size_t output_len, char **handled_output, size_t *handled_output_len, int mode) 726{ 727 php_url_scanner_session_handler_impl(output, output_len, handled_output, handled_output_len, mode, 0); 728} 729 730static inline int php_url_scanner_add_var_impl(const char *name, size_t name_len, const char *value, size_t value_len, int encode, int type) 731{ 732 smart_str sname = {0}; 733 smart_str svalue = {0}; 734 smart_str hname = {0}; 735 smart_str hvalue = {0}; 736 zend_string *encoded; 737 url_adapt_state_ex_t *url_state; 738 php_output_handler_func_t handler; 739 bool should_start = false; 740 741 if (type) { 742 url_state = &BG(url_adapt_session_ex); 743 handler = php_url_scanner_session_handler; 744 } else { 745 url_state = &BG(url_adapt_output_ex); 746 handler = php_url_scanner_output_handler; 747 } 748 749 if (!url_state->active) { 750 php_url_scanner_ex_activate(type); 751 should_start = true; 752 url_state->active = 1; 753 } 754 755 if (url_state->url_app.s && ZSTR_LEN(url_state->url_app.s) != 0) { 756 smart_str_appends(&url_state->url_app, PG(arg_separator).output); 757 } 758 759 if (encode) { 760 encoded = php_raw_url_encode(name, name_len); 761 smart_str_appendl(&sname, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); zend_string_free(encoded); 762 encoded = php_raw_url_encode(value, value_len); 763 smart_str_appendl(&svalue, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); zend_string_free(encoded); 764 encoded = php_escape_html_entities_ex((const unsigned char *) name, name_len, 0, ENT_QUOTES|ENT_SUBSTITUTE, NULL, /* double_encode */ 0, /* quiet */ 1); 765 smart_str_appendl(&hname, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); zend_string_free(encoded); 766 encoded = php_escape_html_entities_ex((const unsigned char *) value, value_len, 0, ENT_QUOTES|ENT_SUBSTITUTE, NULL, /* double_encode */ 0, /* quiet */ 1); 767 smart_str_appendl(&hvalue, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); zend_string_free(encoded); 768 } else { 769 smart_str_appendl(&sname, name, name_len); 770 smart_str_appendl(&svalue, value, value_len); 771 smart_str_appendl(&hname, name, name_len); 772 smart_str_appendl(&hvalue, value, value_len); 773 } 774 775 smart_str_append_smart_str(&url_state->url_app, &sname); 776 smart_str_appendc(&url_state->url_app, '='); 777 smart_str_append_smart_str(&url_state->url_app, &svalue); 778 779 smart_str_appends(&url_state->form_app, "<input type=\"hidden\" name=\""); 780 smart_str_append_smart_str(&url_state->form_app, &hname); 781 smart_str_appends(&url_state->form_app, "\" value=\""); 782 smart_str_append_smart_str(&url_state->form_app, &hvalue); 783 smart_str_appends(&url_state->form_app, "\" />"); 784 785 smart_str_free(&sname); 786 smart_str_free(&svalue); 787 smart_str_free(&hname); 788 smart_str_free(&hvalue); 789 790 if (should_start) { 791 php_output_start_internal(ZEND_STRL("URL-Rewriter"), handler, 0, PHP_OUTPUT_HANDLER_STDFLAGS); 792 } 793 794 return SUCCESS; 795} 796 797 798PHPAPI int php_url_scanner_add_session_var(const char *name, size_t name_len, const char *value, size_t value_len, int encode) 799{ 800 return php_url_scanner_add_var_impl(name, name_len, value, value_len, encode, 1); 801} 802 803 804PHPAPI int php_url_scanner_add_var(const char *name, size_t name_len, const char *value, size_t value_len, int encode) 805{ 806 return php_url_scanner_add_var_impl(name, name_len, value, value_len, encode, 0); 807} 808 809 810static inline void php_url_scanner_reset_vars_impl(int type) { 811 url_adapt_state_ex_t *url_state; 812 813 if (type) { 814 url_state = &BG(url_adapt_session_ex); 815 } else { 816 url_state = &BG(url_adapt_output_ex); 817 } 818 819 if (url_state->form_app.s) { 820 ZSTR_LEN(url_state->form_app.s) = 0; 821 } 822 if (url_state->url_app.s) { 823 ZSTR_LEN(url_state->url_app.s) = 0; 824 } 825} 826 827 828PHPAPI int php_url_scanner_reset_session_vars(void) 829{ 830 php_url_scanner_reset_vars_impl(1); 831 return SUCCESS; 832} 833 834 835PHPAPI int php_url_scanner_reset_vars(void) 836{ 837 php_url_scanner_reset_vars_impl(0); 838 return SUCCESS; 839} 840 841 842static inline int php_url_scanner_reset_var_impl(zend_string *name, int encode, int type) 843{ 844 char *start, *end, *limit; 845 size_t separator_len; 846 smart_str sname = {0}; 847 smart_str hname = {0}; 848 smart_str url_app = {0}; 849 smart_str form_app = {0}; 850 zend_string *encoded; 851 int ret = SUCCESS; 852 bool sep_removed = 0; 853 url_adapt_state_ex_t *url_state; 854 855 if (type) { 856 url_state = &BG(url_adapt_session_ex); 857 } else { 858 url_state = &BG(url_adapt_output_ex); 859 } 860 861 /* Short circuit check. Only check url_app. */ 862 if (!url_state->url_app.s || !ZSTR_LEN(url_state->url_app.s)) { 863 return SUCCESS; 864 } 865 866 if (encode) { 867 encoded = php_raw_url_encode(ZSTR_VAL(name), ZSTR_LEN(name)); 868 smart_str_appendl(&sname, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); 869 zend_string_free(encoded); 870 encoded = php_escape_html_entities_ex((const unsigned char *) ZSTR_VAL(name), ZSTR_LEN(name), 0, ENT_QUOTES|ENT_SUBSTITUTE, SG(default_charset), /* double_encode */ 0, /* quiet */ 1); 871 smart_str_appendl(&hname, ZSTR_VAL(encoded), ZSTR_LEN(encoded)); 872 zend_string_free(encoded); 873 } else { 874 smart_str_appendl(&sname, ZSTR_VAL(name), ZSTR_LEN(name)); 875 smart_str_appendl(&hname, ZSTR_VAL(name), ZSTR_LEN(name)); 876 } 877 smart_str_0(&sname); 878 smart_str_0(&hname); 879 880 smart_str_append_smart_str(&url_app, &sname); 881 smart_str_appendc(&url_app, '='); 882 smart_str_0(&url_app); 883 884 smart_str_appends(&form_app, "<input type=\"hidden\" name=\""); 885 smart_str_append_smart_str(&form_app, &hname); 886 smart_str_appends(&form_app, "\" value=\""); 887 smart_str_0(&form_app); 888 889 /* Short circuit check. Only check url_app. */ 890 start = (char *) php_memnstr(ZSTR_VAL(url_state->url_app.s), 891 ZSTR_VAL(url_app.s), ZSTR_LEN(url_app.s), 892 ZSTR_VAL(url_state->url_app.s) + ZSTR_LEN(url_state->url_app.s)); 893 if (!start) { 894 ret = FAILURE; 895 goto finish; 896 } 897 898 /* Get end of url var */ 899 limit = ZSTR_VAL(url_state->url_app.s) + ZSTR_LEN(url_state->url_app.s); 900 end = start + ZSTR_LEN(url_app.s); 901 separator_len = strlen(PG(arg_separator).output); 902 while (end < limit) { 903 if (!memcmp(end, PG(arg_separator).output, separator_len)) { 904 end += separator_len; 905 sep_removed = 1; 906 break; 907 } 908 end++; 909 } 910 /* Remove all when this is the only rewrite var */ 911 if (ZSTR_LEN(url_state->url_app.s) == end - start) { 912 php_url_scanner_reset_vars_impl(type); 913 goto finish; 914 } 915 /* Check preceding separator */ 916 if (!sep_removed 917 && (size_t)(start - PG(arg_separator).output) >= separator_len 918 && !memcmp(start - separator_len, PG(arg_separator).output, separator_len)) { 919 start -= separator_len; 920 } 921 /* Remove partially */ 922 memmove(start, end, 923 ZSTR_LEN(url_state->url_app.s) - (end - ZSTR_VAL(url_state->url_app.s))); 924 ZSTR_LEN(url_state->url_app.s) -= end - start; 925 ZSTR_VAL(url_state->url_app.s)[ZSTR_LEN(url_state->url_app.s)] = '\0'; 926 927 /* Remove form var */ 928 start = (char *) php_memnstr(ZSTR_VAL(url_state->form_app.s), 929 ZSTR_VAL(form_app.s), ZSTR_LEN(form_app.s), 930 ZSTR_VAL(url_state->form_app.s) + ZSTR_LEN(url_state->form_app.s)); 931 if (!start) { 932 /* Should not happen */ 933 ret = FAILURE; 934 php_url_scanner_reset_vars_impl(type); 935 goto finish; 936 } 937 /* Get end of form var */ 938 limit = ZSTR_VAL(url_state->form_app.s) + ZSTR_LEN(url_state->form_app.s); 939 end = start + ZSTR_LEN(form_app.s); 940 while (end < limit) { 941 if (*end == '>') { 942 end += 1; 943 break; 944 } 945 end++; 946 } 947 /* Remove partially */ 948 memmove(start, end, 949 ZSTR_LEN(url_state->form_app.s) - (end - ZSTR_VAL(url_state->form_app.s))); 950 ZSTR_LEN(url_state->form_app.s) -= end - start; 951 ZSTR_VAL(url_state->form_app.s)[ZSTR_LEN(url_state->form_app.s)] = '\0'; 952 953finish: 954 smart_str_free(&url_app); 955 smart_str_free(&form_app); 956 smart_str_free(&sname); 957 smart_str_free(&hname); 958 return ret; 959} 960 961 962PHPAPI int php_url_scanner_reset_session_var(zend_string *name, int encode) 963{ 964 return php_url_scanner_reset_var_impl(name, encode, 1); 965} 966 967 968PHPAPI int php_url_scanner_reset_var(zend_string *name, int encode) 969{ 970 return php_url_scanner_reset_var_impl(name, encode, 0); 971} 972 973 974PHP_MINIT_FUNCTION(url_scanner) 975{ 976 REGISTER_INI_ENTRIES(); 977 return SUCCESS; 978} 979 980PHP_MSHUTDOWN_FUNCTION(url_scanner) 981{ 982 UNREGISTER_INI_ENTRIES(); 983 984 return SUCCESS; 985} 986 987PHP_RINIT_FUNCTION(url_scanner) 988{ 989 BG(url_adapt_session_ex).active = 0; 990 BG(url_adapt_session_ex).tag_type = 0; 991 BG(url_adapt_session_ex).attr_type = 0; 992 BG(url_adapt_output_ex).active = 0; 993 BG(url_adapt_output_ex).tag_type = 0; 994 BG(url_adapt_output_ex).attr_type = 0; 995 return SUCCESS; 996} 997 998PHP_RSHUTDOWN_FUNCTION(url_scanner) 999{ 1000 if (BG(url_adapt_session_ex).active) { 1001 php_url_scanner_ex_deactivate(1); 1002 BG(url_adapt_session_ex).active = 0; 1003 BG(url_adapt_session_ex).tag_type = 0; 1004 BG(url_adapt_session_ex).attr_type = 0; 1005 } 1006 smart_str_free(&BG(url_adapt_session_ex).form_app); 1007 smart_str_free(&BG(url_adapt_session_ex).url_app); 1008 1009 if (BG(url_adapt_output_ex).active) { 1010 php_url_scanner_ex_deactivate(0); 1011 BG(url_adapt_output_ex).active = 0; 1012 BG(url_adapt_output_ex).tag_type = 0; 1013 BG(url_adapt_output_ex).attr_type = 0; 1014 } 1015 smart_str_free(&BG(url_adapt_output_ex).form_app); 1016 smart_str_free(&BG(url_adapt_output_ex).url_app); 1017 1018 return SUCCESS; 1019} 1020
