diff options
Diffstat (limited to 'tor.cc')
| -rw-r--r-- | tor.cc | 429 |
1 files changed, 429 insertions, 0 deletions
@@ -0,0 +1,429 @@ +//-*- 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/acquire-method.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 <sys/stat.h> +#include <sys/time.h> +#include <unistd.h> +#include <stdio.h> +#include <iostream> +#include <sstream> +#include <ctype.h> +#include <stdlib.h> + +#include "tor.h" + +#include <apti18n.h> + /*}}}*/ +using namespace std; + +size_t +HttpsMethod::parse_header(void *buffer, size_t size, size_t nmemb, void *userp) +{ + size_t len = size * nmemb; + HttpsMethod *me = (HttpsMethod *)userp; + std::string line((char*) buffer, len); + for (--len; len > 0; --len) + if (isspace(line[len]) == 0) + { + ++len; + break; + } + line.erase(len); + + if (line.empty() == true) + { + if (me->Server->Result != 416 && me->Server->StartPos != 0) + ; + else if (me->Server->Result == 416 && me->Server->Size == me->File->FileSize()) + { + me->Server->Result = 200; + me->Server->StartPos = me->Server->Size; + } + else + me->Server->StartPos = 0; + + me->File->Truncate(me->Server->StartPos); + me->File->Seek(me->Server->StartPos); + } + else if (me->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 = (HttpsMethod *)userp; + + if (me->Res.Size == 0) + me->URIStart(me->Res); + if(me->File->Write(buffer, size*nmemb) != true) + return false; + + return size*nmemb; +} + +int +HttpsMethod::progress_callback(void *clientp, double dltotal, double /*dlnow*/, + double /*ultotal*/, double /*ulnow*/) +{ + HttpsMethod *me = (HttpsMethod *)clientp; + if(dltotal > 0 && me->Res.Size == 0) { + me->Res.Size = (unsigned long long)dltotal; + } + return 0; +} + +// HttpsServerState::HttpsServerState - Constructor /*{{{*/ +HttpsServerState::HttpsServerState(URI Srv,HttpsMethod * /*Owner*/) : ServerState(Srv, NULL) +{ + TimeOut = _config->FindI("Acquire::https::Timeout",TimeOut); + Reset(); +} + /*}}}*/ + +void HttpsMethod::SetupProxy() /*{{{*/ +{ + URI ServerName = Queue->Uri; + + // 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 = _config->Find("Acquire::tor::Proxy", _config->Find("Acquire::tor::Proxy").c_str()); + + if (UseProxy.empty() == true) + { + UseProxy = "socks5h://localhost:9050"; + } + + // Determine what host and port to use based on the proxy settings + Proxy = UseProxy; + 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()); + } + + // Set proxy type to SOCKS5, and let proxy do DNS resolution + curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME); +} /*}}}*/ +// 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; + string remotehost = Uri.Host; + + // Undo the "tor" at the start + Uri.Access = "http"; + + // TODO: + // - http::Pipeline-Depth + // - error checking/reporting + // - more debug options? (CURLOPT_DEBUGFUNCTION?) + + curl_easy_reset(curl); + SetupProxy(); + + maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc")); + + // 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, this); + curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data); + curl_easy_setopt(curl, CURLOPT_WRITEDATA, this); + curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback); + curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, this); + // options + curl_easy_setopt(curl, CURLOPT_NOPROGRESS, false); + curl_easy_setopt(curl, CURLOPT_FILETIME, true); + // only allow curl to handle https, not the other stuff it supports + //curl_easy_setopt(curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTPS); + //curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTPS); + + // SSL parameters are set by default to the common (non mirror-specific) value + // if available (or a default one) and gets overload by mirror-specific ones. + + // File containing the list of trusted CA. + string cainfo = _config->Find("Acquire::https::CaInfo",""); + string knob = "Acquire::https::"+remotehost+"::CaInfo"; + cainfo = _config->Find(knob.c_str(),cainfo.c_str()); + if(cainfo.empty() == false) + curl_easy_setopt(curl, CURLOPT_CAINFO,cainfo.c_str()); + + // Check server certificate against previous CA list ... + bool peer_verify = _config->FindB("Acquire::https::Verify-Peer",true); + knob = "Acquire::https::" + remotehost + "::Verify-Peer"; + peer_verify = _config->FindB(knob.c_str(), peer_verify); + curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, peer_verify); + + // ... and hostname against cert CN or subjectAltName + bool verify = _config->FindB("Acquire::https::Verify-Host",true); + knob = "Acquire::https::"+remotehost+"::Verify-Host"; + verify = _config->FindB(knob.c_str(),verify); + int const default_verify = (verify == true) ? 2 : 0; + curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, default_verify); + + // Also enforce issuer of server certificate using its cert + string issuercert = _config->Find("Acquire::https::IssuerCert",""); + knob = "Acquire::https::"+remotehost+"::IssuerCert"; + issuercert = _config->Find(knob.c_str(),issuercert.c_str()); + if(issuercert.empty() == false) + curl_easy_setopt(curl, CURLOPT_ISSUERCERT,issuercert.c_str()); + + // For client authentication, certificate file ... + string pem = _config->Find("Acquire::https::SslCert",""); + knob = "Acquire::https::"+remotehost+"::SslCert"; + pem = _config->Find(knob.c_str(),pem.c_str()); + if(pem.empty() == false) + curl_easy_setopt(curl, CURLOPT_SSLCERT, pem.c_str()); + + // ... and associated key. + string key = _config->Find("Acquire::https::SslKey",""); + knob = "Acquire::https::"+remotehost+"::SslKey"; + key = _config->Find(knob.c_str(),key.c_str()); + if(key.empty() == false) + curl_easy_setopt(curl, CURLOPT_SSLKEY, key.c_str()); + + // Allow forcing SSL version to SSLv3 or TLSv1 (SSLv2 is not + // supported by GnuTLS). + long final_version = CURL_SSLVERSION_DEFAULT; + string sslversion = _config->Find("Acquire::https::SslForceVersion",""); + knob = "Acquire::https::"+remotehost+"::SslForceVersion"; + sslversion = _config->Find(knob.c_str(),sslversion.c_str()); + if(sslversion == "TLSv1") + final_version = CURL_SSLVERSION_TLSv1; + else if(sslversion == "SSLv3") + final_version = CURL_SSLVERSION_SSLv3; + curl_easy_setopt(curl, CURLOPT_SSLVERSION, final_version); + + // CRL file + string crlfile = _config->Find("Acquire::https::CrlFile",""); + knob = "Acquire::https::"+remotehost+"::CrlFile"; + crlfile = _config->Find(knob.c_str(),crlfile.c_str()); + if(crlfile.empty() == false) + curl_easy_setopt(curl, CURLOPT_CRLFILE, crlfile.c_str()); + + // cache-control + if(_config->FindB("Acquire::https::No-Cache", + _config->FindB("Acquire::http::No-Cache",false)) == false) + { + // cache enabled + if (_config->FindB("Acquire::https::No-Store", + _config->FindB("Acquire::http::No-Store",false)) == true) + headers = curl_slist_append(headers,"Cache-Control: no-store"); + stringstream ss; + ioprintf(ss, "Cache-Control: max-age=%u", _config->FindI("Acquire::https::Max-Age", + _config->FindI("Acquire::http::Max-Age",0))); + headers = curl_slist_append(headers, ss.str().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 = _config->FindI("Acquire::https::Dl-Limit", + _config->FindI("Acquire::http::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, + _config->Find("Acquire::https::User-Agent", + _config->Find("Acquire::http::User-Agent", + "Debian APT-CURL/1.0 (" PACKAGE_VERSION ")").c_str()).c_str()); + + // set timeout + int const timeout = _config->FindI("Acquire::https::Timeout", + _config->FindI("Acquire::http::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); + + // set redirect options and default to 10 redirects + bool const AllowRedirect = _config->FindB("Acquire::https::AllowRedirect", + _config->FindB("Acquire::http::AllowRedirect",true)); + curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, AllowRedirect); + curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10); + + // debug + if(_config->FindB("Debug::Acquire::https", false)) + 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 (_config->FindB("Acquire::https::SendAccept", _config->FindB("Acquire::http::SendAccept", true)) == 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 (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0) + { + char Buf[1000]; + sprintf(Buf, "Range: bytes=%li-", (long) SBuf.st_size); + headers = curl_slist_append(headers, Buf); + sprintf(Buf, "If-Range: %s", TimeRFC1123(SBuf.st_mtime).c_str()); + headers = curl_slist_append(headers, Buf); + } + else if(Itm->LastModified > 0) + { + curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE); + curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified); + } + + // go for it - if the file exists, append on it + File = new FileFd(Itm->DestFile, FileFd::WriteAny); + Server = new HttpsServerState(Itm->Uri, this); + + // 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); + + File->Close(); + curl_slist_free_all(headers); + + // cleanup + if (success != 0) + { + _error->Error("%s", curl_errorstr); + unlink(File->Name().c_str()); + return false; + } + + // server says file not modified + if (Server->Result == 304 || curl_condition_unmet == 1) + { + unlink(File->Name().c_str()); + Res.IMSHit = true; + Res.LastModified = Itm->LastModified; + Res.Size = 0; + URIDone(Res); + return true; + } + Res.IMSHit = false; + + if (Server->Result != 200 && // OK + Server->Result != 206 && // Partial + Server->Result != 416) // invalid Range + { + char err[255]; + snprintf(err, sizeof(err) - 1, "HttpError%i", Server->Result); + SetFailReason(err); + _error->Error("%s", err); + // unlink, no need keep 401/404 page content in partial/ + unlink(File->Name().c_str()); + return false; + } + + 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; + + // invalid range-request + if (Server->Result == 416) + { + unlink(File->Name().c_str()); + Res.Size = 0; + delete File; + Redirect(Itm->Uri); + return true; + } + + // 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 + Hashes Hash; + FileFd Fd(Res.Filename, FileFd::ReadOnly); + Hash.AddFD(Fd); + Res.TakeHashes(Hash); + + // keep apt updated + URIDone(Res); + + // cleanup + Res.Size = 0; + delete File; + + return true; +} + +int main() +{ + setlocale(LC_ALL, ""); + + HttpsMethod Mth; + curl_global_init(CURL_GLOBAL_SSL) ; + + return Mth.Run(); +} + |