// transfer.java // ----------------------- // part of YaCy caching proxy // (C) by Michael Peter Christen; mc@anomic.de // first published on http://www.anomic.de // Frankfurt, Germany, 2004 // created 07.11.2005 // // $LastChangedDate$ // $LastChangedRevision$ // $LastChangedBy$ // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 2 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA // // Using this software in any meaning (reading, learning, copying, compiling, // running) means that you agree that the Author(s) is (are) not responsible // for cost, loss of data or any harm that may be caused directly or indirectly // by usage of this softare or this documentation. The usage of this software // is on your own risk. The installation and usage (starting/running) of this // software may allow other people or application to access your computer and // any attached devices and is highly dependent on the configuration of the // software which must be done by the user of the software; the author(s) is // (are) also not responsible for proper configuration and usage of the // software, even if provoked by documentation provided together with // the software. // // Any changes to this file according to the GPL as documented in the file // gpl.txt aside this file in the shipment you received can be done to the // lines that follows this copyright notice here, but changes must not be // done inside the copyright notive above. A re-distribution must contain // the intact and unchanged copyright notice. // Contributions and changes to the program code must be marked as such. import java.io.File; import java.io.IOException; import de.anomic.http.httpHeader; import de.anomic.kelondro.kelondroBase64Order; import de.anomic.plasma.plasmaRankingDistribution; import de.anomic.plasma.plasmaSwitchboard; import de.anomic.server.serverCodings; import de.anomic.server.serverFileUtils; import de.anomic.server.serverObjects; import de.anomic.server.serverSwitch; import de.anomic.yacy.yacyCore; import de.anomic.yacy.yacySeed; public final class transfer { public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) { if (post == null || env == null) return null; plasmaSwitchboard sb = (plasmaSwitchboard) env; serverObjects prop = new serverObjects(); String process = post.get("process", ""); // permission or store //String key = post.get("key", ""); // a transmission key from the client String otherpeer = post.get("iam", ""); // identification of the client (a peer-hash) String purpose = post.get("purpose", ""); // declares how the file shall be treated String filename = post.get("filename", ""); // a name of a file without path //long filesize = Long.parseLong((String) post.get("filesize", "")); // the size of the file prop.put("process", 0); prop.putASIS("response", "denied"); // reject is default and is overwritten if ok prop.putASIS("process_access", ""); prop.putASIS("process_address", ""); prop.putASIS("process_protocol", ""); prop.putASIS("process_path", ""); prop.putASIS("process_maxsize", "0"); if (sb.isRobinsonMode()) { // in a robinson environment, do not answer. We do not do any transfer in a robinson cluster. return prop; } if (!sb.rankingOn) { return prop; } yacySeed otherseed = yacyCore.seedDB.get(otherpeer); if ((otherseed == null) || (filename.indexOf("..") >= 0)) { // reject unknown peers: this does not appear fair, but anonymous senders are dangerous // reject paths that contain '..' because they are dangerous if (otherseed == null) sb.getLog().logFine("RankingTransmission: rejected unknown peer '" + otherpeer + "', current IP " + header.get("CLIENTIP", "unknown")); if (filename.indexOf("..") >= 0) sb.getLog().logFine("RankingTransmission: rejected wrong path '" + filename + "' from peer " + otherseed.getName() + "/" + otherseed.getPublicAddress()+ ", current IP " + header.get("CLIENTIP", "unknown")); return prop; } String otherpeerName = otherseed.hash + ":" + otherseed.getName(); if (process.equals("permission")) { prop.put("process", 0); if (((purpose.equals("crcon")) && (filename.startsWith("CRG")) && (filename.endsWith(".cr.gz"))) || ((filename.startsWith("domlist")) && (filename.endsWith(".txt.gz") || filename.endsWith(".zip")))) { // consolidation of cr files //System.out.println("yacy/transfer:post=" + post.toString()); //String cansendprotocol = (String) post.get("can-send-protocol", "http"); String access = kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(otherpeer + ":" + filename)) + ":" + kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw("" + System.currentTimeMillis())); prop.putASIS("response", "ok"); prop.putASIS("process_access", access); prop.putASIS("process_address", yacyCore.seedDB.mySeed.getPublicAddress()); prop.putASIS("process_protocol", "http"); prop.putASIS("process_path", ""); // currently empty; the store process will find a path prop.putASIS("process_maxsize", "-1"); // if response is too big we return the size of the file sb.rankingPermissions.put(serverCodings.encodeMD5Hex(kelondroBase64Order.standardCoder.encodeString(access)), filename); sb.getLog().logFine("RankingTransmission: granted peer " + otherpeerName + " to send CR file " + filename); } return prop; } if (process.equals("store")) { prop.put("process", 1); if (purpose.equals("crcon")) { byte[] filebytes = (byte[]) post.get("filename$file"); String accesscode = post.get("access", ""); // one-time authentication String md5 = post.get("md5", ""); // one-time authentication //java.util.HashMap perm = sb.rankingPermissions; //System.out.println("PERMISSIONDEBUG: accesscode=" + accesscode + ", permissions=" + perm.toString()); String grantedFile = (String) sb.rankingPermissions.get(accesscode); prop.putASIS("process_tt", ""); if ((grantedFile == null) || (!(grantedFile.equals(filename)))) { // fraud-access of this interface prop.putASIS("response", "denied"); sb.getLog().logFine("RankingTransmission: denied " + otherpeerName + " to send CR file " + filename + ": wrong access code"); } else { sb.rankingPermissions.remove(accesscode); // not needed any more File path = new File(sb.rankingPath, plasmaRankingDistribution.CR_OTHER); path.mkdirs(); File file = new File(path, filename); try { if (file.getCanonicalPath().toString().startsWith(path.getCanonicalPath().toString())){ serverFileUtils.write(filebytes, file); String md5t = serverCodings.encodeMD5Hex(file); if (md5t.equals(md5)) { prop.putASIS("response", "ok"); sb.getLog().logFine("RankingTransmission: received from peer " + otherpeerName + " CR file " + filename); } else { prop.putASIS("response", "transfer failure"); sb.getLog().logFine("RankingTransmission: transfer failure from peer " + otherpeerName + " for CR file " + filename); } }else{ //exploit? prop.putASIS("response", "io error"); return prop; } } catch (IOException e) { prop.putASIS("response", "io error"); } } } return prop; } // wrong access sb.getLog().logFine("RankingTransmission: rejected unknown process " + process + ":" + purpose + " from peer " + otherpeerName); return prop; } }