//-*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: http.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $ /* ###################################################################### HTTPS Acquire Method - This is the HTTPS acquire method for APT. It uses libcurl ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <config.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/error.h> #include <apt-pkg/hashes.h> #include <apt-pkg/netrc.h> #include <apt-pkg/configuration.h> #include <apt-pkg/macros.h> #include <apt-pkg/strutl.h> #include <apt-pkg/proxy.h> #include <sys/stat.h> #include <sys/time.h> #include <unistd.h> #include <stdio.h> #include <ctype.h> #include <stdlib.h> #include <array> #include <iostream> #include <sstream> #include "https.h" #include <apti18n.h> /*}}}*/ using namespace std; struct APT_HIDDEN CURLUserPointer { HttpsMethod * const https; HttpsMethod::FetchResult * const Res; HttpsMethod::FetchItem const * const Itm; CURLUserPointer(HttpsMethod * const https, HttpsMethod::FetchResult * const Res, HttpsMethod::FetchItem const * const Itm) : https(https), Res(Res), Itm(Itm) {} }; size_t HttpsMethod::parse_header(void *buffer, size_t size, size_t nmemb, void *userp) { size_t len = size * nmemb; CURLUserPointer *me = static_cast<CURLUserPointer *>(userp); std::string line((char*) buffer, len); for (--len; len > 0; --len) if (isspace_ascii(line[len]) == 0) { ++len; break; } line.erase(len); if (line.empty() == true) { me->https->Server->JunkSize = 0; if (me->https->Server->Result != 416 && me->https->Server->StartPos != 0) ; else if (me->https->Server->Result == 416) { bool partialHit = false; if (me->Itm->ExpectedHashes.usable() == true) { Hashes resultHashes(me->Itm->ExpectedHashes); FileFd file(me->Itm->DestFile, FileFd::ReadOnly); me->https->Server->TotalFileSize = file.FileSize(); me->https->Server->Date = file.ModificationTime(); resultHashes.AddFD(file); HashStringList const hashList = resultHashes.GetHashStringList(); partialHit = (me->Itm->ExpectedHashes == hashList); } else if (me->https->Server->Result == 416 && me->https->Server->TotalFileSize == me->https->File->FileSize()) partialHit = true; if (partialHit == true) { me->https->Server->Result = 200; me->https->Server->StartPos = me->https->Server->TotalFileSize; // the actual size is not important for https as curl will deal with it // by itself and e.g. doesn't bother us with transport-encoding… me->https->Server->JunkSize = std::numeric_limits<unsigned long long>::max(); } else me->https->Server->StartPos = 0; } else me->https->Server->StartPos = 0; me->Res->LastModified = me->https->Server->Date; me->Res->Size = me->https->Server->TotalFileSize; me->Res->ResumePoint = me->https->Server->StartPos; // we expect valid data, so tell our caller we get the file now if (me->https->Server->Result >= 200 && me->https->Server->Result < 300) { if (me->Res->Size != 0 && me->Res->Size > me->Res->ResumePoint) me->https->URIStart(*me->Res); if (me->https->Server->AddPartialFileToHashes(*(me->https->File)) == false) return 0; } else me->https->Server->JunkSize = std::numeric_limits<decltype(me->https->Server->JunkSize)>::max(); } else if (me->https->Server->HeaderLine(line) == false) return 0; return size*nmemb; } size_t HttpsMethod::write_data(void *buffer, size_t size, size_t nmemb, void *userp) { HttpsMethod *me = static_cast<HttpsMethod *>(userp); size_t buffer_size = size * nmemb; // we don't need to count the junk here, just drop anything we get as // we don't always know how long it would be, e.g. in chunked encoding. if (me->Server->JunkSize != 0) return buffer_size; if(me->File->Write(buffer, buffer_size) != true) return 0; if(me->Queue->MaximumSize > 0) { unsigned long long const TotalWritten = me->File->Tell(); if (TotalWritten > me->Queue->MaximumSize) { me->SetFailReason("MaximumSizeExceeded"); _error->Error("Writing more data than expected (%llu > %llu)", TotalWritten, me->Queue->MaximumSize); return 0; } } if (me->Server->GetHashes()->Add((unsigned char const * const)buffer, buffer_size) == false) return 0; return buffer_size; } // HttpsServerState::HttpsServerState - Constructor /*{{{*/ HttpsServerState::HttpsServerState(URI Srv,HttpsMethod * Owner) : ServerState(Srv, Owner), Hash(NULL) { TimeOut = Owner->ConfigFindI("Timeout", TimeOut); Reset(); } /*}}}*/ bool HttpsServerState::InitHashes(HashStringList const &ExpectedHashes) /*{{{*/ { delete Hash; Hash = new Hashes(ExpectedHashes); return true; } /*}}}*/ APT_PURE Hashes * HttpsServerState::GetHashes() /*{{{*/ { return Hash; } /*}}}*/ bool HttpsMethod::SetupProxy() /*{{{*/ { URI ServerName = Queue->Uri; // Determine the proxy setting AutoDetectProxy(ServerName); // Curl should never read proxy settings from the environment, as // we determine which proxy to use. Do this for consistency among // methods and prevent an environment variable overriding a // no-proxy ("DIRECT") setting in apt.conf. curl_easy_setopt(curl, CURLOPT_PROXY, ""); // Determine the proxy setting - try https first, fallback to http and use env at last string UseProxy = ConfigFind("Proxy::" + ServerName.Host, ""); if (UseProxy.empty() == true) UseProxy = ConfigFind("Proxy", ""); // User wants to use NO proxy, so nothing to setup if (UseProxy == "DIRECT") return true; // Parse no_proxy, a comma (,) separated list of domains we don't want to use // a proxy for so we stop right here if it is in the list if (getenv("no_proxy") != 0 && CheckDomainList(ServerName.Host,getenv("no_proxy")) == true) return true; if (UseProxy.empty() == true) { const char* result = nullptr; if (std::find(methodNames.begin(), methodNames.end(), "https") != methodNames.end()) result = getenv("https_proxy"); // FIXME: Fall back to http_proxy is to remain compatible with // existing setups and behaviour of apt.conf. This should be // deprecated in the future (including apt.conf). Most other // programs do not fall back to http proxy settings and neither // should Apt. if (result == nullptr && std::find(methodNames.begin(), methodNames.end(), "http") != methodNames.end()) result = getenv("http_proxy"); UseProxy = result == nullptr ? "" : result; } // Determine what host and port to use based on the proxy settings if (UseProxy.empty() == false) { Proxy = UseProxy; AddProxyAuth(Proxy, ServerName); if (Proxy.Access == "socks5h") curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME); else if (Proxy.Access == "socks5") curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5); else if (Proxy.Access == "socks4a") curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A); else if (Proxy.Access == "socks") curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4); else if (Proxy.Access == "http" || Proxy.Access == "https") curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_HTTP); else return false; if (Proxy.Port != 1) curl_easy_setopt(curl, CURLOPT_PROXYPORT, Proxy.Port); curl_easy_setopt(curl, CURLOPT_PROXY, Proxy.Host.c_str()); if (Proxy.User.empty() == false || Proxy.Password.empty() == false) { curl_easy_setopt(curl, CURLOPT_PROXYUSERNAME, Proxy.User.c_str()); curl_easy_setopt(curl, CURLOPT_PROXYPASSWORD, Proxy.Password.c_str()); } } return true; } /*}}}*/ // HttpsMethod::Fetch - Fetch an item /*{{{*/ // --------------------------------------------------------------------- /* This adds an item to the pipeline. We keep the pipeline at a fixed depth. */ bool HttpsMethod::Fetch(FetchItem *Itm) { struct stat SBuf; struct curl_slist *headers=NULL; char curl_errorstr[CURL_ERROR_SIZE]; URI Uri = Itm->Uri; setPostfixForMethodNames(Uri.Host.c_str()); AllowRedirect = ConfigFindB("AllowRedirect", true); Debug = DebugEnabled(); // TODO: // - http::Pipeline-Depth // - error checking/reporting // - more debug options? (CURLOPT_DEBUGFUNCTION?) { auto const plus = Binary.find('+'); if (plus != std::string::npos) Uri.Access = Binary.substr(plus + 1); } curl_easy_reset(curl); if (SetupProxy() == false) return _error->Error("Unsupported proxy configured: %s", URI::SiteOnly(Proxy).c_str()); maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc")); FetchResult Res; CURLUserPointer userp(this, &Res, Itm); // callbacks curl_easy_setopt(curl, CURLOPT_URL, static_cast<string>(Uri).c_str()); curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, parse_header); curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &userp); curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data); curl_easy_setopt(curl, CURLOPT_WRITEDATA, this); // options curl_easy_setopt(curl, CURLOPT_NOPROGRESS, true); curl_easy_setopt(curl, CURLOPT_FILETIME, true); curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 0); if (std::find(methodNames.begin(), methodNames.end(), "https") != methodNames.end()) { curl_easy_setopt(curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTPS); curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTPS); // File containing the list of trusted CA. std::string const cainfo = ConfigFind("CaInfo", ""); if(cainfo.empty() == false) curl_easy_setopt(curl, CURLOPT_CAINFO, cainfo.c_str()); // Check server certificate against previous CA list ... curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, ConfigFindB("Verify-Peer", true) ? 1 : 0); // ... and hostname against cert CN or subjectAltName curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, ConfigFindB("Verify-Host", true) ? 2 : 0); // Also enforce issuer of server certificate using its cert std::string const issuercert = ConfigFind("IssuerCert", ""); if(issuercert.empty() == false) curl_easy_setopt(curl, CURLOPT_ISSUERCERT, issuercert.c_str()); // For client authentication, certificate file ... std::string const pem = ConfigFind("SslCert", ""); if(pem.empty() == false) curl_easy_setopt(curl, CURLOPT_SSLCERT, pem.c_str()); // ... and associated key. std::string const key = ConfigFind("SslKey", ""); if(key.empty() == false) curl_easy_setopt(curl, CURLOPT_SSLKEY, key.c_str()); // Allow forcing SSL version to SSLv3 or TLSv1 long final_version = CURL_SSLVERSION_DEFAULT; std::string const sslversion = ConfigFind("SslForceVersion", ""); if(sslversion == "TLSv1") final_version = CURL_SSLVERSION_TLSv1; else if(sslversion == "TLSv1.0") final_version = CURL_SSLVERSION_TLSv1_0; else if(sslversion == "TLSv1.1") final_version = CURL_SSLVERSION_TLSv1_1; else if(sslversion == "TLSv1.2") final_version = CURL_SSLVERSION_TLSv1_2; else if(sslversion == "SSLv3") final_version = CURL_SSLVERSION_SSLv3; curl_easy_setopt(curl, CURLOPT_SSLVERSION, final_version); // CRL file std::string const crlfile = ConfigFind("CrlFile", ""); if(crlfile.empty() == false) curl_easy_setopt(curl, CURLOPT_CRLFILE, crlfile.c_str()); } else { curl_easy_setopt(curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP); curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP); } // cache-control if(ConfigFindB("No-Cache", false) == false) { // cache enabled if (ConfigFindB("No-Store", false) == true) headers = curl_slist_append(headers,"Cache-Control: no-store"); std::string ss; strprintf(ss, "Cache-Control: max-age=%u", ConfigFindI("Max-Age", 0)); headers = curl_slist_append(headers, ss.c_str()); } else { // cache disabled by user headers = curl_slist_append(headers, "Cache-Control: no-cache"); headers = curl_slist_append(headers, "Pragma: no-cache"); } curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); // speed limit int const dlLimit = ConfigFindI("Dl-Limit", 0) * 1024; if (dlLimit > 0) curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, dlLimit); // set header curl_easy_setopt(curl, CURLOPT_USERAGENT, ConfigFind("User-Agent", "Debian APT-CURL/1.0 (" PACKAGE_VERSION ")").c_str()); // set timeout int const timeout = ConfigFindI("Timeout", 120); curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, timeout); //set really low lowspeed timeout (see #497983) curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, DL_MIN_SPEED); curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, timeout); // debug if (Debug == true) curl_easy_setopt(curl, CURLOPT_VERBOSE, true); // error handling curl_errorstr[0] = '\0'; curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr); // If we ask for uncompressed files servers might respond with content- // negotiation which lets us end up with compressed files we do not support, // see 657029, 657560 and co, so if we have no extension on the request // ask for text only. As a sidenote: If there is nothing to negotate servers // seem to be nice and ignore it. if (ConfigFindB("SendAccept", true)) { size_t const filepos = Itm->Uri.find_last_of('/'); string const file = Itm->Uri.substr(filepos + 1); if (flExtension(file) == file) headers = curl_slist_append(headers, "Accept: text/*"); } // go for it - if the file exists, append on it File = new FileFd(Itm->DestFile, FileFd::WriteAny); if (Server == nullptr || Server->Comp(Itm->Uri) == false) Server = CreateServerState(Itm->Uri); else Server->Reset(false); // if we have the file send an if-range query with a range header if (Server->RangesAllowed && stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0) { std::string Buf; strprintf(Buf, "Range: bytes=%lli-", (long long) SBuf.st_size); headers = curl_slist_append(headers, Buf.c_str()); strprintf(Buf, "If-Range: %s", TimeRFC1123(SBuf.st_mtime, false).c_str()); headers = curl_slist_append(headers, Buf.c_str()); } else if(Itm->LastModified > 0) { curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE); curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified); } if (Server->InitHashes(Itm->ExpectedHashes) == false) return false; // keep apt updated Res.Filename = Itm->DestFile; // get it! CURLcode success = curl_easy_perform(curl); // If the server returns 200 OK but the If-Modified-Since condition is not // met, CURLINFO_CONDITION_UNMET will be set to 1 long curl_condition_unmet = 0; curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &curl_condition_unmet); if (curl_condition_unmet == 1) Server->Result = 304; File->Close(); curl_slist_free_all(headers); // cleanup if (success != CURLE_OK) { #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wswitch" switch (success) { case CURLE_COULDNT_RESOLVE_PROXY: case CURLE_COULDNT_RESOLVE_HOST: SetFailReason("ResolveFailure"); break; case CURLE_COULDNT_CONNECT: SetFailReason("ConnectionRefused"); break; case CURLE_OPERATION_TIMEDOUT: SetFailReason("Timeout"); break; } #pragma GCC diagnostic pop // only take curls technical errors if we haven't our own // (e.g. for the maximum size limit we have and curls can be confusing) if (_error->PendingError() == false) _error->Error("%s", curl_errorstr); else _error->Warning("curl: %s", curl_errorstr); return false; } switch (DealWithHeaders(Res)) { case ServerMethod::IMS_HIT: URIDone(Res); break; case ServerMethod::ERROR_WITH_CONTENT_PAGE: // unlink, no need keep 401/404 page content in partial/ RemoveFile(Binary.c_str(), File->Name()); case ServerMethod::ERROR_UNRECOVERABLE: case ServerMethod::ERROR_NOT_FROM_SERVER: return false; case ServerMethod::TRY_AGAIN_OR_REDIRECT: Redirect(NextURI); break; case ServerMethod::FILE_IS_OPEN: struct stat resultStat; if (unlikely(stat(File->Name().c_str(), &resultStat) != 0)) { _error->Errno("stat", "Unable to access file %s", File->Name().c_str()); return false; } Res.Size = resultStat.st_size; // Timestamp curl_easy_getinfo(curl, CURLINFO_FILETIME, &Res.LastModified); if (Res.LastModified != -1) { struct timeval times[2]; times[0].tv_sec = Res.LastModified; times[1].tv_sec = Res.LastModified; times[0].tv_usec = times[1].tv_usec = 0; utimes(File->Name().c_str(), times); } else Res.LastModified = resultStat.st_mtime; // take hashes Res.TakeHashes(*(Server->GetHashes())); // keep apt updated URIDone(Res); break; } delete File; return true; } /*}}}*/ std::unique_ptr<ServerState> HttpsMethod::CreateServerState(URI const &uri)/*{{{*/ { return std::unique_ptr<ServerState>(new HttpsServerState(uri, this)); } /*}}}*/ HttpsMethod::HttpsMethod(std::string &&pProg) : ServerMethod(std::move(pProg),"1.2",Pipeline | SendConfig)/*{{{*/ { auto addName = std::inserter(methodNames, methodNames.begin()); addName = "http"; auto const plus = Binary.find('+'); if (plus != std::string::npos) { addName = Binary.substr(plus + 1); auto base = Binary.substr(0, plus); if (base != "https") addName = base; } if (std::find(methodNames.begin(), methodNames.end(), "https") != methodNames.end()) curl_global_init(CURL_GLOBAL_SSL); else curl_global_init(CURL_GLOBAL_NOTHING); curl = curl_easy_init(); } /*}}}*/ HttpsMethod::~HttpsMethod() /*{{{*/ { curl_easy_cleanup(curl); } /*}}}*/ int main(int, const char *argv[]) /*{{{*/ { std::string Binary = flNotDir(argv[0]); if (Binary.find('+') == std::string::npos && Binary != "https") Binary.append("+https"); return HttpsMethod(std::move(Binary)).Run(); } /*}}}*/