ceph/src/auth/cephx/CephxClientHandler.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2009 Sage Weil <sage@newdream.net>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15
  16 #include <errno.h>
  17
  18 #include "CephxClientHandler.h"
  19 #include "CephxProtocol.h"
  20
  21 #include "auth/KeyRing.h"
  22 #include "common/config.h"
  23 #include "common/dout.h"
  24
  25 #define dout_subsys ceph_subsys_auth
  26 #undef dout_prefix
  27 #define dout_prefix *_dout << "cephx client: "
  28
  29
  30 int CephxClientHandler::build_request(bufferlist& bl) const
  31 {
  32   ldout(cct, 10) << "build_request" << dendl;
  33
  34   RWLock::RLocker l(lock);
  35
  36   if (need & CEPH_ENTITY_TYPE_AUTH) {
  37     /* authenticate */
  38     CephXRequestHeader header;
  39     header.request_type = CEPHX_GET_AUTH_SESSION_KEY;
  40     ::encode(header, bl);
  41
  42     CryptoKey secret;
  43     const bool got = keyring->get_secret(cct->_conf->name, secret);
  44     if (!got) {
  45       ldout(cct, 20) << "no secret found for entity: " << cct->_conf->name << dendl;
  46       return -ENOENT;
  47     }
  48
  49     // is the key OK?
  50     if (!secret.get_secret().length()) {
  51       ldout(cct, 20) << "secret for entity " << cct->_conf->name << " is invalid" << dendl;
  52       return -EINVAL;
  53     }
  54
  55     CephXAuthenticate req;
  56     get_random_bytes((char *)&req.client_challenge, sizeof(req.client_challenge));
  57     std::string error;
  58     cephx_calc_client_server_challenge(cct, secret, server_challenge,
  59                                        req.client_challenge, &req.key, error);
  60     if (!error.empty()) {
  61       ldout(cct, 20) << "cephx_calc_client_server_challenge error: " << error << dendl;
  62       return -EIO;
  63     }
  64
  65     req.old_ticket = ticket_handler->ticket;
  66
  67     if (req.old_ticket.blob.length()) {
  68       ldout(cct, 20) << "old ticket len=" << req.old_ticket.blob.length() << dendl;
  69     }
  70
  71     ::encode(req, bl);
  72
  73     ldout(cct, 10) << "get auth session key: client_challenge "
  74                    << hex << req.client_challenge << dendl;
  75     return 0;
  76   }
  77
  78   if (_need_tickets()) {
  79     /* get service tickets */
  80     ldout(cct, 10) << "get service keys: want=" << want << " need=" << need << " have=" << have << dendl;
  81
  82     CephXRequestHeader header;
  83     header.request_type = CEPHX_GET_PRINCIPAL_SESSION_KEY;
  84     ::encode(header, bl);
  85
  86     CephXAuthorizer *authorizer = ticket_handler->build_authorizer(global_id);
  87     if (!authorizer)
  88       return -EINVAL;
  89     bl.claim_append(authorizer->bl);
  90     delete authorizer;
  91
  92     CephXServiceTicketRequest req;
  93     req.keys = need;
  94     ::encode(req, bl);
  95   }
  96
  97   return 0;
  98 }
  99
 100 bool CephxClientHandler::_need_tickets() const
 101 {
 102   // do not bother (re)requesting tickets if we *only* need the MGR
 103   // ticket; that can happen during an upgrade and we want to avoid a
 104   // loop.  we'll end up re-requesting it later when the secrets
 105   // rotating.
 106   return need && need != CEPH_ENTITY_TYPE_MGR;
 107 }
 108
 109 int CephxClientHandler::handle_response(int ret, bufferlist::iterator& indata)
 110 {
 111   ldout(cct, 10) << "handle_response ret = " << ret << dendl;
 112   RWLock::WLocker l(lock);
 113
 114   if (ret < 0)
 115     return ret; // hrm!
 116
 117   if (starting) {
 118     CephXServerChallenge ch;
 119     ::decode(ch, indata);
 120     server_challenge = ch.server_challenge;
 121     ldout(cct, 10) << " got initial server challenge "
 122                    << hex << server_challenge << dendl;
 123     starting = false;
 124
 125     tickets.invalidate_ticket(CEPH_ENTITY_TYPE_AUTH);
 126     return -EAGAIN;
 127   }
 128
 129   struct CephXResponseHeader header;
 130   ::decode(header, indata);
 131
 132   switch (header.request_type) {
 133   case CEPHX_GET_AUTH_SESSION_KEY:
 134     {
 135       ldout(cct, 10) << " get_auth_session_key" << dendl;
 136       CryptoKey secret;
 137       const bool got = keyring->get_secret(cct->_conf->name, secret);
 138       if (!got) {
 139         ldout(cct, 0) << "key not found for " << cct->_conf->name << dendl;
 140         return -ENOENT;
 141       }
 142
 143       if (!tickets.verify_service_ticket_reply(secret, indata)) {
 144         ldout(cct, 0) << "could not verify service_ticket reply" << dendl;
 145         return -EPERM;
 146       }
 147       ldout(cct, 10) << " want=" << want << " need=" << need << " have=" << have << dendl;
 148       validate_tickets();
 149       if (_need_tickets())
 150         ret = -EAGAIN;
 151       else
 152         ret = 0;
 153     }
 154     break;
 155
 156   case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 157     {
 158       CephXTicketHandler& ticket_handler = tickets.get_handler(CEPH_ENTITY_TYPE_AUTH);
 159       ldout(cct, 10) << " get_principal_session_key session_key " << ticket_handler.session_key << dendl;
 160
 161       if (!tickets.verify_service_ticket_reply(ticket_handler.session_key, indata)) {
 162         ldout(cct, 0) << "could not verify service_ticket reply" << dendl;
 163         return -EPERM;
 164       }
 165       validate_tickets();
 166       if (!_need_tickets()) {
 167         ret = 0;
 168       }
 169     }
 170     break;
 171
 172   case CEPHX_GET_ROTATING_KEY:
 173     {
 174       ldout(cct, 10) << " get_rotating_key" << dendl;
 175       if (rotating_secrets) {
 176         RotatingSecrets secrets;
 177         CryptoKey secret_key;
 178         const bool got = keyring->get_secret(cct->_conf->name, secret_key);
 179         if (!got) {
 180           ldout(cct, 0) << "key not found for " << cct->_conf->name << dendl;
 181           return -ENOENT;
 182         }
 183         std::string error;
 184         if (decode_decrypt(cct, secrets, secret_key, indata, error)) {
 185           ldout(cct, 0) << "could not set rotating key: decode_decrypt failed. error:"
 186             << error << dendl;
 187           return -EINVAL;
 188         } else {
 189           rotating_secrets->set_secrets(std::move(secrets));
 190         }
 191       }
 192     }
 193     break;
 194
 195   default:
 196    ldout(cct, 0) << " unknown request_type " << header.request_type << dendl;
 197    ceph_abort();
 198   }
 199   return ret;
 200 }
 201
 202
 203
 204 AuthAuthorizer *CephxClientHandler::build_authorizer(uint32_t service_id) const
 205 {
 206   RWLock::RLocker l(lock);
 207   ldout(cct, 10) << "build_authorizer for service " << ceph_entity_type_name(service_id) << dendl;
 208   return tickets.build_authorizer(service_id);
 209 }
 210
 211
 212 bool CephxClientHandler::build_rotating_request(bufferlist& bl) const
 213 {
 214   ldout(cct, 10) << "build_rotating_request" << dendl;
 215   CephXRequestHeader header;
 216   header.request_type = CEPHX_GET_ROTATING_KEY;
 217   ::encode(header, bl);
 218   return true;
 219 }
 220
 221 void CephxClientHandler::prepare_build_request()
 222 {
 223   RWLock::WLocker l(lock);
 224   ldout(cct, 10) << "validate_tickets: want=" << want << " need=" << need
 225                  << " have=" << have << dendl;
 226   validate_tickets();
 227   ldout(cct, 10) << "want=" << want << " need=" << need << " have=" << have
 228                  << dendl;
 229
 230   ticket_handler = &(tickets.get_handler(CEPH_ENTITY_TYPE_AUTH));
 231 }
 232
 233 void CephxClientHandler::validate_tickets()
 234 {
 235   // lock should be held for write
 236   tickets.validate_tickets(want, have, need);
 237 }
 238
 239 bool CephxClientHandler::need_tickets()
 240 {
 241   RWLock::WLocker l(lock);
 242   validate_tickets();
 243
 244   ldout(cct, 20) << "need_tickets: want=" << want
 245                  << " have=" << have
 246                  << " need=" << need
 247                  << dendl;
 248
 249   return _need_tickets();
 250 }
 251