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+//-*- 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 "curl.h"
+
+#include <apti18n.h>
+ /*}}}*/
+using namespace std;
+
+struct APT_HIDDEN CURLUserPointer {
+ HttpsMethod * const https;
+ HttpsMethod::FetchResult * const Res;
+ HttpsMethod::FetchItem const * const Itm;
+ RequestState * const Req;
+ CURLUserPointer(HttpsMethod * const https, HttpsMethod::FetchResult * const Res,
+ HttpsMethod::FetchItem const * const Itm, RequestState * const Req) : https(https), Res(Res), Itm(Itm), Req(Req) {}
+};
+
+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)
+ {
+ if (me->Req->File.Open(me->Itm->DestFile, FileFd::WriteAny) == false)
+ return ERROR_NOT_FROM_SERVER;
+
+ me->Req->JunkSize = 0;
+ if (me->Req->Result != 416 && me->Req->StartPos != 0)
+ ;
+ else if (me->Req->Result == 416)
+ {
+ bool partialHit = false;
+ if (me->Itm->ExpectedHashes.usable() == true)
+ {
+ Hashes resultHashes(me->Itm->ExpectedHashes);
+ FileFd file(me->Itm->DestFile, FileFd::ReadOnly);
+ me->Req->TotalFileSize = file.FileSize();
+ me->Req->Date = file.ModificationTime();
+ resultHashes.AddFD(file);
+ HashStringList const hashList = resultHashes.GetHashStringList();
+ partialHit = (me->Itm->ExpectedHashes == hashList);
+ }
+ else if (me->Req->Result == 416 && me->Req->TotalFileSize == me->Req->File.FileSize())
+ partialHit = true;
+
+ if (partialHit == true)
+ {
+ me->Req->Result = 200;
+ me->Req->StartPos = me->Req->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->Req->JunkSize = std::numeric_limits<unsigned long long>::max();
+ }
+ else
+ me->Req->StartPos = 0;
+ }
+ else
+ me->Req->StartPos = 0;
+
+ me->Res->LastModified = me->Req->Date;
+ me->Res->Size = me->Req->TotalFileSize;
+ me->Res->ResumePoint = me->Req->StartPos;
+
+ // we expect valid data, so tell our caller we get the file now
+ if (me->Req->Result >= 200 && me->Req->Result < 300)
+ {
+ if (me->Res->Size != 0 && me->Res->Size > me->Res->ResumePoint)
+ me->https->URIStart(*me->Res);
+ if (me->Req->AddPartialFileToHashes(me->Req->File) == false)
+ return 0;
+ }
+ else
+ me->Req->JunkSize = std::numeric_limits<decltype(me->Req->JunkSize)>::max();
+ }
+ else if (me->Req->HeaderLine(line) == false)
+ return 0;
+
+ return size*nmemb;
+}
+
+size_t
+HttpsMethod::write_data(void *buffer, size_t size, size_t nmemb, void *userp)
+{
+ CURLUserPointer *me = static_cast<CURLUserPointer *>(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->Req->JunkSize != 0)
+ return buffer_size;
+
+ if(me->Req->File.Write(buffer, buffer_size) != true)
+ return 0;
+
+ if(me->https->Queue->MaximumSize > 0)
+ {
+ unsigned long long const TotalWritten = me->Req->File.Tell();
+ if (TotalWritten > me->https->Queue->MaximumSize)
+ {
+ me->https->SetFailReason("MaximumSizeExceeded");
+ _error->Error("Writing more data than expected (%llu > %llu)",
+ TotalWritten, me->https->Queue->MaximumSize);
+ return 0;
+ }
+ }
+
+ if (me->https->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"));
+ if (Server == nullptr || Server->Comp(Itm->Uri) == false)
+ Server = CreateServerState(Itm->Uri);
+
+ // The "+" is encoded as a workaround for a amazon S3 bug
+ // see LP bugs #1003633 and #1086997. (taken from http method)
+ Uri.Path = QuoteString(Uri.Path, "+~ ");
+
+ FetchResult Res;
+ RequestState Req(this, Server.get());
+ CURLUserPointer userp(this, &Res, Itm, &Req);
+ // 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, &userp);
+ // 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);
+
+ if(_config->FindB("Acquire::ForceIPv4", false) == true)
+ curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
+ else if(_config->FindB("Acquire::ForceIPv6", false) == true)
+ curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V6);
+
+ // 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/*");
+ }
+
+ // 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)
+ Req.Result = 304;
+
+ Req.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, Req))
+ {
+ case BaseHttpMethod::IMS_HIT:
+ URIDone(Res);
+ break;
+
+ case BaseHttpMethod::ERROR_WITH_CONTENT_PAGE:
+ // unlink, no need keep 401/404 page content in partial/
+ RemoveFile(Binary.c_str(), Req.File.Name());
+ // Fall through.
+ case BaseHttpMethod::ERROR_UNRECOVERABLE:
+ case BaseHttpMethod::ERROR_NOT_FROM_SERVER:
+ return false;
+
+ case BaseHttpMethod::TRY_AGAIN_OR_REDIRECT:
+ Redirect(NextURI);
+ break;
+
+ case BaseHttpMethod::FILE_IS_OPEN:
+ struct stat resultStat;
+ if (unlikely(stat(Req.File.Name().c_str(), &resultStat) != 0))
+ {
+ _error->Errno("stat", "Unable to access file %s", Req.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(Req.File.Name().c_str(), times);
+ }
+ else
+ Res.LastModified = resultStat.st_mtime;
+
+ // take hashes
+ Res.TakeHashes(*(Server->GetHashes()));
+
+ // keep apt updated
+ URIDone(Res);
+ break;
+ }
+ 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) : BaseHttpMethod(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();
+}
+ /*}}}*/
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