// transfer.java // ----------------------- // part of YaCy caching proxy // (C) by Michael Peter Christen; mc@yacy.net // 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 import java.io.File; import java.io.IOException; import de.anomic.http.httpHeader; import de.anomic.http.httpRequestHeader; import de.anomic.kelondro.order.Base64Order; import de.anomic.kelondro.order.Digest; import de.anomic.kelondro.util.FileUtils; import de.anomic.plasma.plasmaRankingDistribution; import de.anomic.plasma.plasmaSwitchboard; import de.anomic.server.serverObjects; import de.anomic.server.serverSwitch; import de.anomic.yacy.yacyNetwork; import de.anomic.yacy.yacySeed; public final class transfer { public static serverObjects respond(final httpRequestHeader header, final serverObjects post, final serverSwitch env) { final plasmaSwitchboard sb = (plasmaSwitchboard) env; final serverObjects prop = new serverObjects(); if ((post == null) || (env == null)) return prop; if (!yacyNetwork.authentifyRequest(post, env)) return prop; final String process = post.get("process", ""); // permission or store //String key = post.get("key", ""); // a transmission key from the client final String otherpeer = post.get("iam", ""); // identification of the client (a peer-hash) final String purpose = post.get("purpose", ""); // declares how the file shall be treated final 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.put("response", "denied"); // reject is default and is overwritten if ok prop.put("process_access", ""); prop.put("process_address", ""); prop.put("process_protocol", ""); prop.put("process_path", ""); prop.put("process_maxsize", "0"); if (sb.isRobinsonMode() || !sb.rankingOn) { // in a robinson environment, do not answer. We do not do any transfer in a robinson cluster. return prop; } final yacySeed otherseed = sb.peers.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 (sb.getLog().isFine()) { if (otherseed == null) sb.getLog().logFine("RankingTransmission: rejected unknown peer '" + otherpeer + "', current IP " + header.get(httpHeader.CONNECTION_PROP_CLIENTIP, "unknown")); if (filename.indexOf("..") >= 0) sb.getLog().logFine("RankingTransmission: rejected wrong path '" + filename + "' from peer " + (otherseed == null ? "null" : otherseed.getName() + "/" + otherseed.getPublicAddress()) + ", current IP " + header.get(httpHeader.CONNECTION_PROP_CLIENTIP, "unknown")); } return prop; } final 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"); final String access = Base64Order.enhancedCoder.encode(Digest.encodeMD5Raw(otherpeer + ":" + filename)) + ":" + Base64Order.enhancedCoder.encode(Digest.encodeMD5Raw("" + System.currentTimeMillis())); prop.put("response", "ok"); prop.put("process_access", access); prop.put("process_address", sb.peers.mySeed().getPublicAddress()); prop.put("process_protocol", "http"); prop.put("process_path", ""); // currently empty; the store process will find a path prop.put("process_maxsize", "-1"); // if response is too big we return the size of the file sb.rankingPermissions.put(Digest.encodeMD5Hex(Base64Order.standardCoder.encodeString(access)), filename); if (sb.getLog().isFine()) 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")) { final String fileString = post.get("filename$file"); final String accesscode = post.get("access", ""); // one-time authentication final String md5 = post.get("md5", ""); // one-time authentication //java.util.HashMap perm = sb.rankingPermissions; //System.out.println("PERMISSIONDEBUG: accesscode=" + accesscode + ", permissions=" + perm.toString()); final String grantedFile = sb.rankingPermissions.get(accesscode); prop.put("process_tt", ""); if ((grantedFile == null) || (!(grantedFile.equals(filename)))) { // fraud-access of this interface prop.put("response", "denied"); if (sb.getLog().isFine()) sb.getLog().logFine("RankingTransmission: denied " + otherpeerName + " to send CR file " + filename + ": wrong access code"); } else { sb.rankingPermissions.remove(accesscode); // not needed any more final File path = new File(sb.rankingPath, plasmaRankingDistribution.CR_OTHER); path.mkdirs(); final File file = new File(path, filename); try { if (file.getCanonicalPath().startsWith(path.getCanonicalPath())){ FileUtils.copy(fileString.getBytes(), file); final String md5t = Digest.encodeMD5Hex(file); if (md5t.equals(md5)) { prop.put("response", "ok"); if (sb.getLog().isFine()) sb.getLog().logFine("RankingTransmission: received from peer " + otherpeerName + " CR file " + filename); } else { prop.put("response", "transfer failure"); if (sb.getLog().isFine()) sb.getLog().logFine("RankingTransmission: transfer failure from peer " + otherpeerName + " for CR file " + filename); } }else{ //exploit? prop.put("response", "io error"); return prop; } } catch (final IOException e) { prop.put("response", "io error"); } } } return prop; } // wrong access if (sb.getLog().isFine()) sb.getLog().logFine("RankingTransmission: rejected unknown process " + process + ":" + purpose + " from peer " + otherpeerName); return prop; } }