src/errorpage.cc

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /* DEBUG: section 04    Error Generation */
  10
  11 #include "squid.h"
  12 #include "cache_cf.h"
  13 #include "clients/forward.h"
  14 #include "comm/Connection.h"
  15 #include "comm/Write.h"
  16 #include "disk.h"
  17 #include "err_detail_type.h"
  18 #include "errorpage.h"
  19 #include "fde.h"
  20 #include "html_quote.h"
  21 #include "HttpHeaderTools.h"
  22 #include "HttpReply.h"
  23 #include "HttpRequest.h"
  24 #include "MemBuf.h"
  25 #include "MemObject.h"
  26 #include "rfc1738.h"
  27 #include "SquidConfig.h"
  28 #include "Store.h"
  29 #include "tools.h"
  30 #include "URL.h"
  31 #include "wordlist.h"
  32 #if USE_AUTH
  33 #include "auth/UserRequest.h"
  34 #endif
  35 #include "SquidTime.h"
  36 #if USE_OPENSSL
  37 #include "ssl/ErrorDetailManager.h"
  38 #endif
  39
  40 /**
  41  \defgroup ErrorPageInternal Error Page Internals
  42  \ingroup ErrorPageAPI
  43  *
  44  \section Abstract Abstract:
  45  *   These routines are used to generate error messages to be
  46  *   sent to clients.  The error type is used to select between
  47  *   the various message formats. (formats are stored in the
  48  *   Config.errorDirectory)
  49  */
  50
  51 #if !defined(DEFAULT_SQUID_ERROR_DIR)
  52 /** Where to look for errors if config path fails.
  53  \note Please use ./configure --datadir=/path instead of patching
  54  */
  55 #define DEFAULT_SQUID_ERROR_DIR   DEFAULT_SQUID_DATA_DIR"/errors"
  56 #endif
  57
  58 /// \ingroup ErrorPageInternal
  59 CBDATA_CLASS_INIT(ErrorState);
  60
  61 /* local types */
  62
  63 /// \ingroup ErrorPageInternal
  64 typedef struct {
  65     int id;
  66     char *page_name;
  67     Http::StatusCode page_redirect;
  68 } ErrorDynamicPageInfo;
  69
  70 /* local constant and vars */
  71
  72 /**
  73  \ingroup ErrorPageInternal
  74  *
  75  \note  hard coded error messages are not appended with %S
  76  *      automagically to give you more control on the format
  77  */
  78 static const struct {
  79     int type;           /* and page_id */
  80     const char *text;
  81 }
  82
  83 error_hard_text[] = {
  84
  85     {
  86         ERR_SQUID_SIGNATURE,
  87         "\n<br>\n"
  88         "<hr>\n"
  89         "<div id=\"footer\">\n"
  90         "Generated %T by %h (%s)\n"
  91         "</div>\n"
  92         "</body></html>\n"
  93     },
  94     {
  95         TCP_RESET,
  96         "reset"
  97     }
  98 };
  99
 100 /// \ingroup ErrorPageInternal
 101 static std::vector<ErrorDynamicPageInfo *> ErrorDynamicPages;
 102
 103 /* local prototypes */
 104
 105 /// \ingroup ErrorPageInternal
 106 static const int error_hard_text_count = sizeof(error_hard_text) / sizeof(*error_hard_text);
 107
 108 /// \ingroup ErrorPageInternal
 109 static char **error_text = NULL;
 110
 111 /// \ingroup ErrorPageInternal
 112 static int error_page_count = 0;
 113
 114 /// \ingroup ErrorPageInternal
 115 static MemBuf error_stylesheet;
 116
 117 static const char *errorFindHardText(err_type type);
 118 static ErrorDynamicPageInfo *errorDynamicPageInfoCreate(int id, const char *page_name);
 119 static void errorDynamicPageInfoDestroy(ErrorDynamicPageInfo * info);
 120 static IOCB errorSendComplete;
 121
 122 /// \ingroup ErrorPageInternal
 123 /// manages an error page template
 124 class ErrorPageFile: public TemplateFile
 125 {
 126 public:
 127     ErrorPageFile(const char *name, const err_type code) : TemplateFile(name,code) {textBuf.init();}
 128
 129     /// The template text data read from disk
 130     const char *text() { return textBuf.content(); }
 131
 132 private:
 133     /// stores the data read from disk to a local buffer
 134     virtual bool parse(const char *buf, int len, bool) {
 135         if (len)
 136             textBuf.append(buf, len);
 137         return true;
 138     }
 139
 140     MemBuf textBuf; ///< A buffer to store the error page
 141 };
 142
 143 /// \ingroup ErrorPageInternal
 144 err_type &operator++ (err_type &anErr)
 145 {
 146     int tmp = (int)anErr;
 147     anErr = (err_type)(++tmp);
 148     return anErr;
 149 }
 150
 151 /// \ingroup ErrorPageInternal
 152 int operator - (err_type const &anErr, err_type const &anErr2)
 153 {
 154     return (int)anErr - (int)anErr2;
 155 }
 156
 157 void
 158 errorInitialize(void)
 159 {
 160     err_type i;
 161     const char *text;
 162     error_page_count = ERR_MAX + ErrorDynamicPages.size();
 163     error_text = static_cast<char **>(xcalloc(error_page_count, sizeof(char *)));
 164
 165     for (i = ERR_NONE, ++i; i < error_page_count; ++i) {
 166         safe_free(error_text[i]);
 167
 168         if ((text = errorFindHardText(i))) {
 169             /**\par
 170              * Index any hard-coded error text into defaults.
 171              */
 172             error_text[i] = xstrdup(text);
 173
 174         } else if (i < ERR_MAX) {
 175             /**\par
 176              * Index precompiled fixed template files from one of two sources:
 177              *  (a) default language translation directory (error_default_language)
 178              *  (b) admin specified custom directory (error_directory)
 179              */
 180             ErrorPageFile errTmpl(err_type_str[i], i);
 181             error_text[i] = errTmpl.loadDefault() ? xstrdup(errTmpl.text()) : NULL;
 182         } else {
 183             /** \par
 184              * Index any unknown file names used by deny_info.
 185              */
 186             ErrorDynamicPageInfo *info = ErrorDynamicPages.at(i - ERR_MAX);
 187             assert(info && info->id == i && info->page_name);
 188
 189             const char *pg = info->page_name;
 190             if (info->page_redirect != Http::scNone)
 191                 pg = info->page_name +4;
 192
 193             if (strchr(pg, ':') == NULL) {
 194                 /** But only if they are not redirection URL. */
 195                 ErrorPageFile errTmpl(pg, ERR_MAX);
 196                 error_text[i] = errTmpl.loadDefault() ? xstrdup(errTmpl.text()) : NULL;
 197             }
 198         }
 199     }
 200
 201     error_stylesheet.reset();
 202
 203     // look for and load stylesheet into global MemBuf for it.
 204     if (Config.errorStylesheet) {
 205         ErrorPageFile tmpl("StylesSheet", ERR_MAX);
 206         tmpl.loadFromFile(Config.errorStylesheet);
 207         error_stylesheet.Printf("%s",tmpl.text());
 208     }
 209
 210 #if USE_OPENSSL
 211     Ssl::errorDetailInitialize();
 212 #endif
 213 }
 214
 215 void
 216 errorClean(void)
 217 {
 218     if (error_text) {
 219         int i;
 220
 221         for (i = ERR_NONE + 1; i < error_page_count; ++i)
 222             safe_free(error_text[i]);
 223
 224         safe_free(error_text);
 225     }
 226
 227     while (!ErrorDynamicPages.empty()) {
 228         errorDynamicPageInfoDestroy(ErrorDynamicPages.back());
 229         ErrorDynamicPages.pop_back();
 230     }
 231
 232     error_page_count = 0;
 233
 234 #if USE_OPENSSL
 235     Ssl::errorDetailClean();
 236 #endif
 237 }
 238
 239 /// \ingroup ErrorPageInternal
 240 static const char *
 241 errorFindHardText(err_type type)
 242 {
 243     int i;
 244
 245     for (i = 0; i < error_hard_text_count; ++i)
 246         if (error_hard_text[i].type == type)
 247             return error_hard_text[i].text;
 248
 249     return NULL;
 250 }
 251
 252 TemplateFile::TemplateFile(const char *name, const err_type code): silent(false), wasLoaded(false), templateName(name), templateCode(code)
 253 {
 254     assert(name);
 255 }
 256
 257 bool
 258 TemplateFile::loadDefault()
 259 {
 260     if (loaded()) // already loaded?
 261         return true;
 262
 263     /** test error_directory configured location */
 264     if (Config.errorDirectory) {
 265         char path[MAXPATHLEN];
 266         snprintf(path, sizeof(path), "%s/%s", Config.errorDirectory, templateName.termedBuf());
 267         loadFromFile(path);
 268     }
 269
 270 #if USE_ERR_LOCALES
 271     /** test error_default_language location */
 272     if (!loaded() && Config.errorDefaultLanguage) {
 273         if (!tryLoadTemplate(Config.errorDefaultLanguage)) {
 274             debugs(1, (templateCode < TCP_RESET ? DBG_CRITICAL : 3), "Unable to load default error language files. Reset to backups.");
 275         }
 276     }
 277 #endif
 278
 279     /* test default location if failed (templates == English translation base templates) */
 280     if (!loaded()) {
 281         tryLoadTemplate("templates");
 282     }
 283
 284     /* giving up if failed */
 285     if (!loaded()) {
 286         debugs(1, (templateCode < TCP_RESET ? DBG_CRITICAL : 3), "WARNING: failed to find or read error text file " << templateName);
 287         parse("Internal Error: Missing Template ", 33, '\0');
 288         parse(templateName.termedBuf(), templateName.size(), '\0');
 289     }
 290
 291     return true;
 292 }
 293
 294 bool
 295 TemplateFile::tryLoadTemplate(const char *lang)
 296 {
 297     assert(lang);
 298
 299     char path[MAXPATHLEN];
 300     /* TODO: prep the directory path string to prevent snprintf ... */
 301     snprintf(path, sizeof(path), "%s/%s/%s",
 302              DEFAULT_SQUID_ERROR_DIR, lang, templateName.termedBuf());
 303     path[MAXPATHLEN-1] = '\0';
 304
 305     if (loadFromFile(path))
 306         return true;
 307
 308 #if HAVE_GLOB
 309     if ( strlen(lang) == 2) {
 310         /* TODO glob the error directory for sub-dirs matching: <tag> '-*'   */
 311         /* use first result. */
 312         debugs(4,2, HERE << "wildcard fallback errors not coded yet.");
 313     }
 314 #endif
 315
 316     return false;
 317 }
 318
 319 bool
 320 TemplateFile::loadFromFile(const char *path)
 321 {
 322     int fd;
 323     char buf[4096];
 324     ssize_t len;
 325
 326     if (loaded()) // already loaded?
 327         return true;
 328
 329     fd = file_open(path, O_RDONLY | O_TEXT);
 330
 331     if (fd < 0) {
 332         /* with dynamic locale negotiation we may see some failures before a success. */
 333         if (!silent && templateCode < TCP_RESET)
 334             debugs(4, DBG_CRITICAL, HERE << "'" << path << "': " << xstrerror());
 335         wasLoaded = false;
 336         return wasLoaded;
 337     }
 338
 339     while ((len = FD_READ_METHOD(fd, buf, sizeof(buf))) > 0) {
 340         if (!parse(buf, len, false)) {
 341             debugs(4, DBG_CRITICAL, HERE << " parse error while reading template file: " << path);
 342             wasLoaded = false;
 343             return wasLoaded;
 344         }
 345     }
 346     parse(buf, 0, true);
 347
 348     if (len < 0) {
 349         debugs(4, DBG_CRITICAL, HERE << "failed to fully read: '" << path << "': " << xstrerror());
 350     }
 351
 352     file_close(fd);
 353
 354     wasLoaded = true;
 355     return wasLoaded;
 356 }
 357
 358 bool strHdrAcptLangGetItem(const String &hdr, char *lang, int langLen, size_t &pos)
 359 {
 360     while (pos < hdr.size()) {
 361         char *dt = lang;
 362
 363         /* skip any initial whitespace. */
 364         while (pos < hdr.size() && xisspace(hdr[pos]))
 365             ++pos;
 366
 367         /*
 368          * Header value format:
 369          *  - sequence of whitespace delimited tags
 370          *  - each tag may suffix with ';'.* which we can ignore.
 371          *  - IFF a tag contains only two characters we can wildcard ANY translations matching: <it> '-'? .*
 372          *    with preference given to an exact match.
 373          */
 374         bool invalid_byte = false;
 375         while (pos < hdr.size() && hdr[pos] != ';' && hdr[pos] != ',' && !xisspace(hdr[pos]) && dt < (lang + (langLen -1)) ) {
 376             if (!invalid_byte) {
 377 #if USE_HTTP_VIOLATIONS
 378                 // if accepting violations we may as well accept some broken browsers
 379                 //  which may send us the right code, wrong ISO formatting.
 380                 if (hdr[pos] == '_')
 381                     *dt = '-';
 382                 else
 383 #endif
 384                     *dt = xtolower(hdr[pos]);
 385                 // valid codes only contain A-Z, hyphen (-) and *
 386                 if (*dt != '-' && *dt != '*' && (*dt < 'a' || *dt > 'z') )
 387                     invalid_byte = true;
 388                 else
 389                     ++dt; // move to next destination byte.
 390             }
 391             ++pos;
 392         }
 393         *dt = '\0'; // nul-terminated the filename content string before system use.
 394         ++dt;
 395
 396         // if we terminated the tag on garbage or ';' we need to skip to the next ',' or end of header.
 397         while (pos < hdr.size() && hdr[pos] != ',')
 398             ++pos;
 399
 400         if (pos < hdr.size() && hdr[pos] == ',')
 401             ++pos;
 402
 403         debugs(4, 9, HERE << "STATE: dt='" << dt << "', lang='" << lang << "', pos=" << pos << ", buf='" << ((pos < hdr.size()) ? hdr.substr(pos,hdr.size()) : "") << "'");
 404
 405         /* if we found anything we might use, try it. */
 406         if (*lang != '\0' && !invalid_byte)
 407             return true;
 408     }
 409     return false;
 410 }
 411
 412 bool
 413 TemplateFile::loadFor(const HttpRequest *request)
 414 {
 415     String hdr;
 416
 417 #if USE_ERR_LOCALES
 418     if (loaded()) // already loaded?
 419         return true;
 420
 421     if (!request || !request->header.getList(HDR_ACCEPT_LANGUAGE, &hdr) )
 422         return false;
 423
 424     char lang[256];
 425     size_t pos = 0; // current parsing position in header string
 426
 427     debugs(4, 6, HERE << "Testing Header: '" << hdr << "'");
 428
 429     while ( strHdrAcptLangGetItem(hdr, lang, 256, pos) ) {
 430
 431         /* wildcard uses the configured default language */
 432         if (lang[0] == '*' && lang[1] == '\0') {
 433             debugs(4, 6, HERE << "Found language '" << lang << "'. Using configured default.");
 434             return false;
 435         }
 436
 437         debugs(4, 6, HERE << "Found language '" << lang << "', testing for available template");
 438
 439         if (tryLoadTemplate(lang)) {
 440             /* store the language we found for the Content-Language reply header */
 441             errLanguage = lang;
 442             break;
 443         } else if (Config.errorLogMissingLanguages) {
 444             debugs(4, DBG_IMPORTANT, "WARNING: Error Pages Missing Language: " << lang);
 445         }
 446     }
 447 #endif
 448
 449     return loaded();
 450 }
 451
 452 /// \ingroup ErrorPageInternal
 453 static ErrorDynamicPageInfo *
 454 errorDynamicPageInfoCreate(int id, const char *page_name)
 455 {
 456     ErrorDynamicPageInfo *info = new ErrorDynamicPageInfo;
 457     info->id = id;
 458     info->page_name = xstrdup(page_name);
 459     info->page_redirect = static_cast<Http::StatusCode>(atoi(page_name));
 460
 461     /* WARNING on redirection status:
 462      * 2xx are permitted, but not documented officially.
 463      * - might be useful for serving static files (PAC etc) in special cases
 464      * 3xx require a URL suitable for Location: header.
 465      * - the current design does not allow for a Location: URI as well as a local file template
 466      *   although this possibility is explicitly permitted in the specs.
 467      * 4xx-5xx require a local file template.
 468      * - sending Location: on these codes with no body is invalid by the specs.
 469      * - current result is Squid crashing or XSS problems as dynamic deny_info load random disk files.
 470      * - a future redesign of the file loading may result in loading remote objects sent inline as local body.
 471      */
 472     if (info->page_redirect == Http::scNone)
 473         ; // special case okay.
 474     else if (info->page_redirect < 200 || info->page_redirect > 599) {
 475         // out of range
 476         debugs(0, DBG_CRITICAL, "FATAL: status " << info->page_redirect << " is not valid on '" << page_name << "'");
 477         self_destruct();
 478     } else if ( /* >= 200 && */ info->page_redirect < 300 && strchr(&(page_name[4]), ':')) {
 479         // 2xx require a local template file
 480         debugs(0, DBG_CRITICAL, "FATAL: status " << info->page_redirect << " requires a template on '" << page_name << "'");
 481         self_destruct();
 482     } else if (info->page_redirect >= 300 && info->page_redirect <= 399 && !strchr(&(page_name[4]), ':')) {
 483         // 3xx require an absolute URL
 484         debugs(0, DBG_CRITICAL, "FATAL: status " << info->page_redirect << " requires a URL on '" << page_name << "'");
 485         self_destruct();
 486     } else if (info->page_redirect >= 400 /* && <= 599 */ && strchr(&(page_name[4]), ':')) {
 487         // 4xx/5xx require a local template file
 488         debugs(0, DBG_CRITICAL, "FATAL: status " << info->page_redirect << " requires a template on '" << page_name << "'");
 489         self_destruct();
 490     }
 491     // else okay.
 492
 493     return info;
 494 }
 495
 496 /// \ingroup ErrorPageInternal
 497 static void
 498 errorDynamicPageInfoDestroy(ErrorDynamicPageInfo * info)
 499 {
 500     assert(info);
 501     safe_free(info->page_name);
 502     delete info;
 503 }
 504
 505 /// \ingroup ErrorPageInternal
 506 static int
 507 errorPageId(const char *page_name)
 508 {
 509     for (int i = 0; i < ERR_MAX; ++i) {
 510         if (strcmp(err_type_str[i], page_name) == 0)
 511             return i;
 512     }
 513
 514     for (size_t j = 0; j < ErrorDynamicPages.size(); ++j) {
 515         if (strcmp(ErrorDynamicPages[j]->page_name, page_name) == 0)
 516             return j + ERR_MAX;
 517     }
 518
 519     return ERR_NONE;
 520 }
 521
 522 err_type
 523 errorReservePageId(const char *page_name)
 524 {
 525     ErrorDynamicPageInfo *info;
 526     int id = errorPageId(page_name);
 527
 528     if (id == ERR_NONE) {
 529         info = errorDynamicPageInfoCreate(ERR_MAX + ErrorDynamicPages.size(), page_name);
 530         ErrorDynamicPages.push_back(info);
 531         id = info->id;
 532     }
 533
 534     return (err_type)id;
 535 }
 536
 537 /// \ingroup ErrorPageInternal
 538 const char *
 539 errorPageName(int pageId)
 540 {
 541     if (pageId >= ERR_NONE && pageId < ERR_MAX)     /* common case */
 542         return err_type_str[pageId];
 543
 544     if (pageId >= ERR_MAX && pageId - ERR_MAX < (ssize_t)ErrorDynamicPages.size())
 545         return ErrorDynamicPages[pageId - ERR_MAX]->page_name;
 546
 547     return "ERR_UNKNOWN";   /* should not happen */
 548 }
 549
 550 ErrorState *
 551 ErrorState::NewForwarding(err_type type, HttpRequest *request)
 552 {
 553     assert(request);
 554     const Http::StatusCode status = request->flags.needValidation ?
 555                                     Http::scGatewayTimeout : Http::scServiceUnavailable;
 556     return new ErrorState(type, status, request);
 557 }
 558
 559 ErrorState::ErrorState(err_type t, Http::StatusCode status, HttpRequest * req) :
 560     type(t),
 561     page_id(t),
 562     err_language(NULL),
 563     httpStatus(status),
 564 #if USE_AUTH
 565     auth_user_request (NULL),
 566 #endif
 567     request(NULL),
 568     url(NULL),
 569     xerrno(0),
 570     port(0),
 571     dnsError(),
 572     ttl(0),
 573     src_addr(),
 574     redirect_url(NULL),
 575     callback(NULL),
 576     callback_data(NULL),
 577     request_hdrs(NULL),
 578     err_msg(NULL),
 579 #if USE_OPENSSL
 580     detail(NULL),
 581 #endif
 582     detailCode(ERR_DETAIL_NONE)
 583 {
 584     memset(&ftp, 0, sizeof(ftp));
 585
 586     if (page_id >= ERR_MAX && ErrorDynamicPages[page_id - ERR_MAX]->page_redirect != Http::scNone)
 587         httpStatus = ErrorDynamicPages[page_id - ERR_MAX]->page_redirect;
 588
 589     if (req != NULL) {
 590         request = req;
 591         HTTPMSGLOCK(request);
 592         src_addr = req->client_addr;
 593     }
 594 }
 595
 596 void
 597 errorAppendEntry(StoreEntry * entry, ErrorState * err)
 598 {
 599     assert(entry->mem_obj != NULL);
 600     assert (entry->isEmpty());
 601     debugs(4, 4, "Creating an error page for entry " << entry <<
 602            " with errorstate " << err <<
 603            " page id " << err->page_id);
 604
 605     if (entry->store_status != STORE_PENDING) {
 606         debugs(4, 2, "Skipping error page due to store_status: " << entry->store_status);
 607         /*
 608          * If the entry is not STORE_PENDING, then no clients
 609          * care about it, and we don't need to generate an
 610          * error message
 611          */
 612         assert(EBIT_TEST(entry->flags, ENTRY_ABORTED));
 613         assert(entry->mem_obj->nclients == 0);
 614         delete err;
 615         return;
 616     }
 617
 618     if (err->page_id == TCP_RESET) {
 619         if (err->request) {
 620             debugs(4, 2, "RSTing this reply");
 621             err->request->flags.resetTcp = true;
 622         }
 623     }
 624
 625     entry->storeErrorResponse(err->BuildHttpReply());
 626     delete err;
 627 }
 628
 629 void
 630 errorSend(const Comm::ConnectionPointer &conn, ErrorState * err)
 631 {
 632     HttpReply *rep;
 633     debugs(4, 3, HERE << conn << ", err=" << err);
 634     assert(Comm::IsConnOpen(conn));
 635
 636     rep = err->BuildHttpReply();
 637
 638     MemBuf *mb = rep->pack();
 639     AsyncCall::Pointer call = commCbCall(78, 5, "errorSendComplete",
 640                                          CommIoCbPtrFun(&errorSendComplete, err));
 641     Comm::Write(conn, mb, call);
 642     delete mb;
 643
 644     delete rep;
 645 }
 646
 647 /**
 648  \ingroup ErrorPageAPI
 649  *
 650  * Called by commHandleWrite() after data has been written
 651  * to the client socket.
 652  *
 653  \note If there is a callback, the callback is responsible for
 654  *     closing the FD, otherwise we do it ourselves.
 655  */
 656 static void
 657 errorSendComplete(const Comm::ConnectionPointer &conn, char *, size_t size, Comm::Flag errflag, int, void *data)
 658 {
 659     ErrorState *err = static_cast<ErrorState *>(data);
 660     debugs(4, 3, HERE << conn << ", size=" << size);
 661
 662     if (errflag != Comm::ERR_CLOSING) {
 663         if (err->callback) {
 664             debugs(4, 3, "errorSendComplete: callback");
 665             err->callback(conn->fd, err->callback_data, size);
 666         } else {
 667             debugs(4, 3, "errorSendComplete: comm_close");
 668             conn->close();
 669         }
 670     }
 671
 672     delete err;
 673 }
 674
 675 ErrorState::~ErrorState()
 676 {
 677     HTTPMSGUNLOCK(request);
 678     safe_free(redirect_url);
 679     safe_free(url);
 680     safe_free(request_hdrs);
 681     wordlistDestroy(&ftp.server_msg);
 682     safe_free(ftp.request);
 683     safe_free(ftp.reply);
 684 #if USE_AUTH
 685     auth_user_request = NULL;
 686 #endif
 687     safe_free(err_msg);
 688 #if USE_ERR_LOCALES
 689     if (err_language != Config.errorDefaultLanguage)
 690 #endif
 691         safe_free(err_language);
 692 #if USE_OPENSSL
 693     delete detail;
 694 #endif
 695 }
 696
 697 int
 698 ErrorState::Dump(MemBuf * mb)
 699 {
 700     MemBuf str;
 701     char ntoabuf[MAX_IPSTRLEN];
 702
 703     str.reset();
 704     /* email subject line */
 705     str.Printf("CacheErrorInfo - %s", errorPageName(type));
 706     mb->Printf("?subject=%s", rfc1738_escape_part(str.buf));
 707     str.reset();
 708     /* email body */
 709     str.Printf("CacheHost: %s\r\n", getMyHostname());
 710     /* - Err Msgs */
 711     str.Printf("ErrPage: %s\r\n", errorPageName(type));
 712
 713     if (xerrno) {
 714         str.Printf("Err: (%d) %s\r\n", xerrno, strerror(xerrno));
 715     } else {
 716         str.Printf("Err: [none]\r\n");
 717     }
 718 #if USE_AUTH
 719     if (auth_user_request.getRaw() && auth_user_request->denyMessage())
 720         str.Printf("Auth ErrMsg: %s\r\n", auth_user_request->denyMessage());
 721 #endif
 722     if (dnsError.size() > 0)
 723         str.Printf("DNS ErrMsg: %s\r\n", dnsError.termedBuf());
 724
 725     /* - TimeStamp */
 726     str.Printf("TimeStamp: %s\r\n\r\n", mkrfc1123(squid_curtime));
 727
 728     /* - IP stuff */
 729     str.Printf("ClientIP: %s\r\n", src_addr.toStr(ntoabuf,MAX_IPSTRLEN));
 730
 731     if (request && request->hier.host[0] != '\0') {
 732         str.Printf("ServerIP: %s\r\n", request->hier.host);
 733     }
 734
 735     str.Printf("\r\n");
 736     /* - HTTP stuff */
 737     str.Printf("HTTP Request:\r\n");
 738
 739     if (NULL != request) {
 740         String urlpath_or_slash;
 741
 742         if (request->urlpath.size() != 0)
 743             urlpath_or_slash = request->urlpath;
 744         else
 745             urlpath_or_slash = "/";
 746
 747         str.Printf(SQUIDSBUFPH " " SQUIDSTRINGPH " %s/%d.%d\n",
 748                    SQUIDSBUFPRINT(request->method.image()),
 749                    SQUIDSTRINGPRINT(urlpath_or_slash),
 750                    AnyP::ProtocolType_str[request->http_ver.protocol],
 751                    request->http_ver.major, request->http_ver.minor);
 752         request->header.packInto(&str);
 753     }
 754
 755     str.Printf("\r\n");
 756     /* - FTP stuff */
 757
 758     if (ftp.request) {
 759         str.Printf("FTP Request: %s\r\n", ftp.request);
 760         str.Printf("FTP Reply: %s\r\n", (ftp.reply? ftp.reply:"[none]"));
 761         str.Printf("FTP Msg: ");
 762         wordlistCat(ftp.server_msg, &str);
 763         str.Printf("\r\n");
 764     }
 765
 766     str.Printf("\r\n");
 767     mb->Printf("&body=%s", rfc1738_escape_part(str.buf));
 768     str.clean();
 769     return 0;
 770 }
 771
 772 /// \ingroup ErrorPageInternal
 773 #define CVT_BUF_SZ 512
 774
 775 const char *
 776 ErrorState::Convert(char token, bool building_deny_info_url, bool allowRecursion)
 777 {
 778     static MemBuf mb;
 779     const char *p = NULL;   /* takes priority over mb if set */
 780     int do_quote = 1;
 781     int no_urlescape = 0;       /* if true then item is NOT to be further URL-encoded */
 782     char ntoabuf[MAX_IPSTRLEN];
 783
 784     mb.reset();
 785
 786     switch (token) {
 787
 788     case 'a':
 789 #if USE_AUTH
 790         if (request && request->auth_user_request != NULL)
 791             p = request->auth_user_request->username();
 792         if (!p)
 793 #endif
 794             p = "-";
 795         break;
 796
 797     case 'b':
 798         mb.Printf("%d", getMyPort());
 799         break;
 800
 801     case 'B':
 802         if (building_deny_info_url) break;
 803         p = request ? Ftp::UrlWith2f(request) : "[no URL]";
 804         break;
 805
 806     case 'c':
 807         if (building_deny_info_url) break;
 808         p = errorPageName(type);
 809         break;
 810
 811     case 'D':
 812         if (!allowRecursion)
 813             p = "%D";  // if recursion is not allowed, do not convert
 814 #if USE_OPENSSL
 815         // currently only SSL error details implemented
 816         else if (detail) {
 817             detail->useRequest(request);
 818             const String &errDetail = detail->toString();
 819             if (errDetail.size() > 0) {
 820                 MemBuf *detail_mb  = ConvertText(errDetail.termedBuf(), false);
 821                 mb.append(detail_mb->content(), detail_mb->contentSize());
 822                 delete detail_mb;
 823                 do_quote = 0;
 824             }
 825         }
 826 #endif
 827         if (!mb.contentSize())
 828             mb.Printf("[No Error Detail]");
 829         break;
 830
 831     case 'e':
 832         mb.Printf("%d", xerrno);
 833         break;
 834
 835     case 'E':
 836         if (xerrno)
 837             mb.Printf("(%d) %s", xerrno, strerror(xerrno));
 838         else
 839             mb.Printf("[No Error]");
 840         break;
 841
 842     case 'f':
 843         if (building_deny_info_url) break;
 844         /* FTP REQUEST LINE */
 845         if (ftp.request)
 846             p = ftp.request;
 847         else
 848             p = "nothing";
 849         break;
 850
 851     case 'F':
 852         if (building_deny_info_url) break;
 853         /* FTP REPLY LINE */
 854         if (ftp.reply)
 855             p = ftp.reply;
 856         else
 857             p = "nothing";
 858         break;
 859
 860     case 'g':
 861         if (building_deny_info_url) break;
 862         /* FTP SERVER RESPONSE */
 863         if (ftp.listing) {
 864             mb.append(ftp.listing->content(), ftp.listing->contentSize());
 865             do_quote = 0;
 866         } else if (ftp.server_msg) {
 867             wordlistCat(ftp.server_msg, &mb);
 868         }
 869         break;
 870
 871     case 'h':
 872         mb.Printf("%s", getMyHostname());
 873         break;
 874
 875     case 'H':
 876         if (request) {
 877             if (request->hier.host[0] != '\0') // if non-empty string.
 878                 p = request->hier.host;
 879             else
 880                 p = request->GetHost();
 881         } else if (!building_deny_info_url)
 882             p = "[unknown host]";
 883         break;
 884
 885     case 'i':
 886         mb.Printf("%s", src_addr.toStr(ntoabuf,MAX_IPSTRLEN));
 887         break;
 888
 889     case 'I':
 890         if (request && request->hier.tcpServer != NULL)
 891             p = request->hier.tcpServer->remote.toStr(ntoabuf,MAX_IPSTRLEN);
 892         else if (!building_deny_info_url)
 893             p = "[unknown]";
 894         break;
 895
 896     case 'l':
 897         if (building_deny_info_url) break;
 898         mb.append(error_stylesheet.content(), error_stylesheet.contentSize());
 899         do_quote = 0;
 900         break;
 901
 902     case 'L':
 903         if (building_deny_info_url) break;
 904         if (Config.errHtmlText) {
 905             mb.Printf("%s", Config.errHtmlText);
 906             do_quote = 0;
 907         } else
 908             p = "[not available]";
 909         break;
 910
 911     case 'm':
 912         if (building_deny_info_url) break;
 913 #if USE_AUTH
 914         if (auth_user_request.getRaw())
 915             p = auth_user_request->denyMessage("[not available]");
 916         else
 917             p = "[not available]";
 918 #else
 919         p = "-";
 920 #endif
 921         break;
 922
 923     case 'M':
 924         if (request) {
 925             const SBuf &m = request->method.image();
 926             mb.append(m.rawContent(), m.length());
 927         } else if (!building_deny_info_url)
 928             p = "[unknown method]";
 929         break;
 930
 931     case 'o':
 932         p = request ? request->extacl_message.termedBuf() : external_acl_message;
 933         if (!p && !building_deny_info_url)
 934             p = "[not available]";
 935         break;
 936
 937     case 'p':
 938         if (request) {
 939             mb.Printf("%d", (int) request->port);
 940         } else if (!building_deny_info_url) {
 941             p = "[unknown port]";
 942         }
 943         break;
 944
 945     case 'P':
 946         if (request) {
 947             p = request->url.getScheme().c_str();
 948         } else if (!building_deny_info_url) {
 949             p = "[unknown protocol]";
 950         }
 951         break;
 952
 953     case 'R':
 954         if (building_deny_info_url) {
 955             p = (request->urlpath.size() != 0 ? request->urlpath.termedBuf() : "/");
 956             no_urlescape = 1;
 957             break;
 958         }
 959         if (NULL != request) {
 960             String urlpath_or_slash;
 961
 962             if (request->urlpath.size() != 0)
 963                 urlpath_or_slash = request->urlpath;
 964             else
 965                 urlpath_or_slash = "/";
 966
 967             mb.Printf(SQUIDSBUFPH " " SQUIDSTRINGPH " %s/%d.%d\n",
 968                       SQUIDSBUFPRINT(request->method.image()),
 969                       SQUIDSTRINGPRINT(urlpath_or_slash),
 970                       AnyP::ProtocolType_str[request->http_ver.protocol],
 971                       request->http_ver.major, request->http_ver.minor);
 972             request->header.packInto(&mb, true); //hide authorization data
 973         } else if (request_hdrs) {
 974             p = request_hdrs;
 975         } else {
 976             p = "[no request]";
 977         }
 978         break;
 979
 980     case 's':
 981         /* for backward compat we make %s show the full URL. Drop this in some future release. */
 982         if (building_deny_info_url) {
 983             p = request ? urlCanonical(request) : url;
 984             debugs(0, DBG_CRITICAL, "WARNING: deny_info now accepts coded tags. Use %u to get the full URL instead of %s");
 985         } else
 986             p = visible_appname_string;
 987         break;
 988
 989     case 'S':
 990         if (building_deny_info_url) {
 991             p = visible_appname_string;
 992             break;
 993         }
 994         /* signature may contain %-escapes, recursion */
 995         if (page_id != ERR_SQUID_SIGNATURE) {
 996             const int saved_id = page_id;
 997             page_id = ERR_SQUID_SIGNATURE;
 998             MemBuf *sign_mb = BuildContent();
 999             mb.Printf("%s", sign_mb->content());
1000             sign_mb->clean();
1001             delete sign_mb;
1002             page_id = saved_id;
1003             do_quote = 0;
1004         } else {
1005             /* wow, somebody put %S into ERR_SIGNATURE, stop recursion */
1006             p = "[%S]";
1007         }
1008         break;
1009
1010     case 't':
1011         mb.Printf("%s", Time::FormatHttpd(squid_curtime));
1012         break;
1013
1014     case 'T':
1015         mb.Printf("%s", mkrfc1123(squid_curtime));
1016         break;
1017
1018     case 'U':
1019         /* Using the fake-https version of canonical so error pages see https:// */
1020         /* even when the url-path cannot be shown as more than '*' */
1021         if (request)
1022             p = urlCanonicalFakeHttps(request);
1023         else if (url)
1024             p = url;
1025         else if (!building_deny_info_url)
1026             p = "[no URL]";
1027         break;
1028
1029     case 'u':
1030         if (request)
1031             p = urlCanonical(request);
1032         else if (url)
1033             p = url;
1034         else if (!building_deny_info_url)
1035             p = "[no URL]";
1036         break;
1037
1038     case 'w':
1039         if (Config.adminEmail)
1040             mb.Printf("%s", Config.adminEmail);
1041         else if (!building_deny_info_url)
1042             p = "[unknown]";
1043         break;
1044
1045     case 'W':
1046         if (building_deny_info_url) break;
1047         if (Config.adminEmail && Config.onoff.emailErrData)
1048             Dump(&mb);
1049         no_urlescape = 1;
1050         break;
1051
1052     case 'x':
1053 #if USE_OPENSSL
1054         if (detail)
1055             mb.Printf("%s", detail->errorName());
1056         else
1057 #endif
1058             if (!building_deny_info_url)
1059                 p = "[Unknown Error Code]";
1060         break;
1061
1062     case 'z':
1063         if (building_deny_info_url) break;
1064         if (dnsError.size() > 0)
1065             p = dnsError.termedBuf();
1066         else if (ftp.cwd_msg)
1067             p = ftp.cwd_msg;
1068         else
1069             p = "[unknown]";
1070         break;
1071
1072     case 'Z':
1073         if (building_deny_info_url) break;
1074         if (err_msg)
1075             p = err_msg;
1076         else
1077             p = "[unknown]";
1078         break;
1079
1080     case '%':
1081         p = "%";
1082         break;
1083
1084     default:
1085         mb.Printf("%%%c", token);
1086         do_quote = 0;
1087         break;
1088     }
1089
1090     if (!p)
1091         p = mb.buf;     /* do not use mb after this assignment! */
1092
1093     assert(p);
1094
1095     debugs(4, 3, "errorConvert: %%" << token << " --> '" << p << "'" );
1096
1097     if (do_quote)
1098         p = html_quote(p);
1099
1100     if (building_deny_info_url && !no_urlescape)
1101         p = rfc1738_escape_part(p);
1102
1103     return p;
1104 }
1105
1106 void
1107 ErrorState::DenyInfoLocation(const char *name, HttpRequest *, MemBuf &result)
1108 {
1109     char const *m = name;
1110     char const *p = m;
1111     char const *t;
1112
1113     if (m[0] == '3')
1114         m += 4; // skip "3xx:"
1115
1116     while ((p = strchr(m, '%'))) {
1117         result.append(m, p - m);       /* copy */
1118         t = Convert(*++p, true, true);       /* convert */
1119         result.Printf("%s", t);        /* copy */
1120         m = p + 1;                     /* advance */
1121     }
1122
1123     if (*m)
1124         result.Printf("%s", m);        /* copy tail */
1125
1126     assert((size_t)result.contentSize() == strlen(result.content()));
1127 }
1128
1129 HttpReply *
1130 ErrorState::BuildHttpReply()
1131 {
1132     HttpReply *rep = new HttpReply;
1133     const char *name = errorPageName(page_id);
1134     /* no LMT for error pages; error pages expire immediately */
1135
1136     if (name[0] == '3' || (name[0] != '2' && name[0] != '4' && name[0] != '5' && strchr(name, ':'))) {
1137         /* Redirection */
1138         Http::StatusCode status = Http::scFound;
1139         // Use configured 3xx reply status if set.
1140         if (name[0] == '3')
1141             status = httpStatus;
1142         else {
1143             // Use 307 for HTTP/1.1 non-GET/HEAD requests.
1144             if (request->method != Http::METHOD_GET && request->method != Http::METHOD_HEAD && request->http_ver >= Http::ProtocolVersion(1,1))
1145                 status = Http::scTemporaryRedirect;
1146         }
1147
1148         rep->setHeaders(status, NULL, "text/html;charset=utf-8", 0, 0, -1);
1149
1150         if (request) {
1151             MemBuf redirect_location;
1152             redirect_location.init();
1153             DenyInfoLocation(name, request, redirect_location);
1154             httpHeaderPutStrf(&rep->header, HDR_LOCATION, "%s", redirect_location.content() );
1155         }
1156
1157         httpHeaderPutStrf(&rep->header, HDR_X_SQUID_ERROR, "%d %s", httpStatus, "Access Denied");
1158     } else {
1159         MemBuf *content = BuildContent();
1160         rep->setHeaders(httpStatus, NULL, "text/html;charset=utf-8", content->contentSize(), 0, -1);
1161         /*
1162          * include some information for downstream caches. Implicit
1163          * replaceable content. This isn't quite sufficient. xerrno is not
1164          * necessarily meaningful to another system, so we really should
1165          * expand it. Additionally, we should identify ourselves. Someone
1166          * might want to know. Someone _will_ want to know OTOH, the first
1167          * X-CACHE-MISS entry should tell us who.
1168          */
1169         httpHeaderPutStrf(&rep->header, HDR_X_SQUID_ERROR, "%s %d", name, xerrno);
1170
1171 #if USE_ERR_LOCALES
1172         /*
1173          * If error page auto-negotiate is enabled in any way, send the Vary.
1174          * RFC 2616 section 13.6 and 14.44 says MAY and SHOULD do this.
1175          * We have even better reasons though:
1176          * see http://wiki.squid-cache.org/KnowledgeBase/VaryNotCaching
1177          */
1178         if (!Config.errorDirectory) {
1179             /* We 'negotiated' this ONLY from the Accept-Language. */
1180             rep->header.delById(HDR_VARY);
1181             rep->header.putStr(HDR_VARY, "Accept-Language");
1182         }
1183
1184         /* add the Content-Language header according to RFC section 14.12 */
1185         if (err_language) {
1186             rep->header.putStr(HDR_CONTENT_LANGUAGE, err_language);
1187         } else
1188 #endif /* USE_ERROR_LOCALES */
1189         {
1190             /* default templates are in English */
1191             /* language is known unless error_directory override used */
1192             if (!Config.errorDirectory)
1193                 rep->header.putStr(HDR_CONTENT_LANGUAGE, "en");
1194         }
1195
1196         rep->body.setMb(content);
1197         /* do not memBufClean() or delete the content, it was absorbed by httpBody */
1198     }
1199
1200     // Make sure error codes get back to the client side for logging and
1201     // error tracking.
1202     if (request) {
1203         int edc = ERR_DETAIL_NONE; // error detail code
1204 #if USE_OPENSSL
1205         if (detail)
1206             edc = detail->errorNo();
1207         else
1208 #endif
1209             if (detailCode)
1210                 edc = detailCode;
1211             else
1212                 edc = xerrno;
1213         request->detailError(type, edc);
1214     }
1215
1216     return rep;
1217 }
1218
1219 MemBuf *
1220 ErrorState::BuildContent()
1221 {
1222     const char *m = NULL;
1223
1224     assert(page_id > ERR_NONE && page_id < error_page_count);
1225
1226 #if USE_ERR_LOCALES
1227     ErrorPageFile *localeTmpl = NULL;
1228
1229     /** error_directory option in squid.conf overrides translations.
1230      * Custom errors are always found either in error_directory or the templates directory.
1231      * Otherwise locate the Accept-Language header
1232      */
1233     if (!Config.errorDirectory && page_id < ERR_MAX) {
1234         if (err_language && err_language != Config.errorDefaultLanguage)
1235             safe_free(err_language);
1236
1237         localeTmpl = new ErrorPageFile(err_type_str[page_id], static_cast<err_type>(page_id));
1238         if (localeTmpl->loadFor(request)) {
1239             m = localeTmpl->text();
1240             assert(localeTmpl->language());
1241             err_language = xstrdup(localeTmpl->language());
1242         }
1243     }
1244 #endif /* USE_ERR_LOCALES */
1245
1246     /** \par
1247      * If client-specific error templates are not enabled or available.
1248      * fall back to the old style squid.conf settings.
1249      */
1250     if (!m) {
1251         m = error_text[page_id];
1252 #if USE_ERR_LOCALES
1253         if (!Config.errorDirectory)
1254             err_language = Config.errorDefaultLanguage;
1255 #endif
1256         debugs(4, 2, HERE << "No existing error page language negotiated for " << errorPageName(page_id) << ". Using default error file.");
1257     }
1258
1259     MemBuf *result = ConvertText(m, true);
1260 #if USE_ERR_LOCALES
1261     if (localeTmpl)
1262         delete localeTmpl;
1263 #endif
1264     return result;
1265 }
1266
1267 MemBuf *ErrorState::ConvertText(const char *text, bool allowRecursion)
1268 {
1269     MemBuf *content = new MemBuf;
1270     const char *p;
1271     const char *m = text;
1272     assert(m);
1273     content->init();
1274
1275     while ((p = strchr(m, '%'))) {
1276         content->append(m, p - m);  /* copy */
1277         const char *t = Convert(*++p, false, allowRecursion);   /* convert */
1278         content->Printf("%s", t);   /* copy */
1279         m = p + 1;          /* advance */
1280     }
1281
1282     if (*m)
1283         content->Printf("%s", m);   /* copy tail */
1284
1285     content->terminate();
1286
1287     assert((size_t)content->contentSize() == strlen(content->content()));
1288
1289     return content;
1290 }
1291