+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-/*
- * Ceph - scalable distributed file system
- *
- * Copyright (C) 2009-2011 New Dream Network
- *
- * This is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software
- * Foundation. See file COPYING.
- *
- */
-
-#include "CephxProtocol.h"
-#include "common/Clock.h"
-#include "common/config.h"
-#include "common/debug.h"
-#include "include/buffer.h"
-
-#define dout_subsys ceph_subsys_auth
-#undef dout_prefix
-#define dout_prefix *_dout << "cephx: "
-
-
-
-void cephx_calc_client_server_challenge(CephContext *cct, CryptoKey& secret, uint64_t server_challenge,
- uint64_t client_challenge, uint64_t *key, std::string &error)
-{
- CephXChallengeBlob b;
- b.server_challenge = server_challenge;
- b.client_challenge = client_challenge;
-
- bufferlist enc;
- if (encode_encrypt(cct, b, secret, enc, error))
- return;
-
- uint64_t k = 0;
- const uint64_t *p = (const uint64_t *)enc.c_str();
- for (int pos = 0; pos + sizeof(k) <= enc.length(); pos+=sizeof(k), p++)
- k ^= mswab(*p);
- *key = k;
-}
-
-
-/*
- * Authentication
- */
-
-bool cephx_build_service_ticket_blob(CephContext *cct, CephXSessionAuthInfo& info,
- CephXTicketBlob& blob)
-{
- CephXServiceTicketInfo ticket_info;
- ticket_info.session_key = info.session_key;
- ticket_info.ticket = info.ticket;
- ticket_info.ticket.caps = info.ticket.caps;
-
- ldout(cct, 10) << "build_service_ticket service " << ceph_entity_type_name(info.service_id)
- << " secret_id " << info.secret_id
- << " ticket_info.ticket.name=" << ticket_info.ticket.name.to_str() << dendl;
- blob.secret_id = info.secret_id;
- std::string error;
- if (!info.service_secret.get_secret().length())
- error = "invalid key"; // Bad key?
- else
- encode_encrypt_enc_bl(cct, ticket_info, info.service_secret, blob.blob, error);
- if (!error.empty()) {
- ldout(cct, -1) << "cephx_build_service_ticket_blob failed with error "
- << error << dendl;
- return false;
- }
- return true;
-}
-
-/*
- * AUTH SERVER: authenticate
- *
- * Authenticate principal, respond with AuthServiceTicketInfo
- *
- * {session key, validity}^principal_secret
- * {principal_ticket, session key}^service_secret ... "enc_ticket"
- */
-bool cephx_build_service_ticket_reply(CephContext *cct,
- CryptoKey& principal_secret,
- vector<CephXSessionAuthInfo> ticket_info_vec,
- bool should_encrypt_ticket,
- CryptoKey& ticket_enc_key,
- bufferlist& reply)
-{
- __u8 service_ticket_reply_v = 1;
- ::encode(service_ticket_reply_v, reply);
-
- uint32_t num = ticket_info_vec.size();
- ::encode(num, reply);
- ldout(cct, 10) << "build_service_ticket_reply encoding " << num
- << " tickets with secret " << principal_secret << dendl;
-
- for (vector<CephXSessionAuthInfo>::iterator ticket_iter = ticket_info_vec.begin();
- ticket_iter != ticket_info_vec.end();
- ++ticket_iter) {
- CephXSessionAuthInfo& info = *ticket_iter;
- ::encode(info.service_id, reply);
-
- __u8 service_ticket_v = 1;
- ::encode(service_ticket_v, reply);
-
- CephXServiceTicket msg_a;
- msg_a.session_key = info.session_key;
- msg_a.validity = info.validity;
- std::string error;
- if (encode_encrypt(cct, msg_a, principal_secret, reply, error)) {
- ldout(cct, -1) << "error encoding encrypted: " << error << dendl;
- return false;
- }
-
- bufferlist service_ticket_bl;
- CephXTicketBlob blob;
- if (!cephx_build_service_ticket_blob(cct, info, blob)) {
- return false;
- }
- ::encode(blob, service_ticket_bl);
-
- ldout(cct, 30) << "service_ticket_blob is ";
- service_ticket_bl.hexdump(*_dout);
- *_dout << dendl;
-
- ::encode((__u8)should_encrypt_ticket, reply);
- if (should_encrypt_ticket) {
- if (encode_encrypt(cct, service_ticket_bl, ticket_enc_key, reply, error)) {
- ldout(cct, -1) << "error encoding encrypted ticket: " << error << dendl;
- return false;
- }
- } else {
- ::encode(service_ticket_bl, reply);
- }
- }
- return true;
-}
-
-/*
- * PRINCIPAL: verify our attempt to authenticate succeeded. fill out
- * this ServiceTicket with the result.
- */
-bool CephXTicketHandler::verify_service_ticket_reply(CryptoKey& secret,
- bufferlist::iterator& indata)
-{
- __u8 service_ticket_v;
- ::decode(service_ticket_v, indata);
-
- CephXServiceTicket msg_a;
- std::string error;
- if (decode_decrypt(cct, msg_a, secret, indata, error)) {
- ldout(cct, 0) << "verify_service_ticket_reply: failed decode_decrypt, error is: " << error << dendl;
- return false;
- }
-
- __u8 ticket_enc;
- ::decode(ticket_enc, indata);
-
- bufferlist service_ticket_bl;
- if (ticket_enc) {
- ldout(cct, 10) << " got encrypted ticket" << dendl;
- std::string error;
- if (decode_decrypt(cct, service_ticket_bl, session_key, indata, error)) {
- ldout(cct, 10) << "verify_service_ticket_reply: decode_decrypt failed "
- << "with " << error << dendl;
- return false;
- }
- } else {
- ::decode(service_ticket_bl, indata);
- }
- bufferlist::iterator iter = service_ticket_bl.begin();
- ::decode(ticket, iter);
- ldout(cct, 10) << " ticket.secret_id=" << ticket.secret_id << dendl;
-
- ldout(cct, 10) << "verify_service_ticket_reply service " << ceph_entity_type_name(service_id)
- << " secret_id " << ticket.secret_id
- << " session_key " << msg_a.session_key
- << " validity=" << msg_a.validity << dendl;
- session_key = msg_a.session_key;
- if (!msg_a.validity.is_zero()) {
- expires = ceph_clock_now();
- expires += msg_a.validity;
- renew_after = expires;
- renew_after -= ((double)msg_a.validity.sec() / 4);
- ldout(cct, 10) << "ticket expires=" << expires << " renew_after=" << renew_after << dendl;
- }
-
- have_key_flag = true;
- return true;
-}
-
-bool CephXTicketHandler::have_key()
-{
- if (have_key_flag) {
- have_key_flag = ceph_clock_now() < expires;
- }
-
- return have_key_flag;
-}
-
-bool CephXTicketHandler::need_key() const
-{
- if (have_key_flag) {
- return (!expires.is_zero()) && (ceph_clock_now() >= renew_after);
- }
-
- return true;
-}
-
-bool CephXTicketManager::have_key(uint32_t service_id)
-{
- map<uint32_t, CephXTicketHandler>::iterator iter = tickets_map.find(service_id);
- if (iter == tickets_map.end())
- return false;
- return iter->second.have_key();
-}
-
-bool CephXTicketManager::need_key(uint32_t service_id) const
-{
- map<uint32_t, CephXTicketHandler>::const_iterator iter = tickets_map.find(service_id);
- if (iter == tickets_map.end())
- return true;
- return iter->second.need_key();
-}
-
-void CephXTicketManager::set_have_need_key(uint32_t service_id, uint32_t& have, uint32_t& need)
-{
- map<uint32_t, CephXTicketHandler>::iterator iter = tickets_map.find(service_id);
- if (iter == tickets_map.end()) {
- have &= ~service_id;
- need |= service_id;
- ldout(cct, 10) << "set_have_need_key no handler for service "
- << ceph_entity_type_name(service_id) << dendl;
- return;
- }
-
- //ldout(cct, 10) << "set_have_need_key service " << ceph_entity_type_name(service_id)
- //<< " (" << service_id << ")"
- //<< " need=" << iter->second.need_key() << " have=" << iter->second.have_key() << dendl;
- if (iter->second.need_key())
- need |= service_id;
- else
- need &= ~service_id;
-
- if (iter->second.have_key())
- have |= service_id;
- else
- have &= ~service_id;
-}
-
-void CephXTicketManager::invalidate_ticket(uint32_t service_id)
-{
- map<uint32_t, CephXTicketHandler>::iterator iter = tickets_map.find(service_id);
- if (iter != tickets_map.end())
- iter->second.invalidate_ticket();
-}
-
-/*
- * PRINCIPAL: verify our attempt to authenticate succeeded. fill out
- * this ServiceTicket with the result.
- */
-bool CephXTicketManager::verify_service_ticket_reply(CryptoKey& secret,
- bufferlist::iterator& indata)
-{
- __u8 service_ticket_reply_v;
- ::decode(service_ticket_reply_v, indata);
-
- uint32_t num;
- ::decode(num, indata);
- ldout(cct, 10) << "verify_service_ticket_reply got " << num << " keys" << dendl;
-
- for (int i=0; i<(int)num; i++) {
- uint32_t type;
- ::decode(type, indata);
- ldout(cct, 10) << "got key for service_id " << ceph_entity_type_name(type) << dendl;
- CephXTicketHandler& handler = get_handler(type);
- if (!handler.verify_service_ticket_reply(secret, indata)) {
- return false;
- }
- handler.service_id = type;
- }
-
- if (!indata.end())
- return false;
-
- return true;
-}
-
-/*
- * PRINCIPAL: build authorizer to access the service.
- *
- * ticket, {timestamp}^session_key
- */
-CephXAuthorizer *CephXTicketHandler::build_authorizer(uint64_t global_id) const
-{
- CephXAuthorizer *a = new CephXAuthorizer(cct);
- a->session_key = session_key;
- a->nonce = ((uint64_t)rand() << 32) + rand();
-
- __u8 authorizer_v = 1;
- ::encode(authorizer_v, a->bl);
- ::encode(global_id, a->bl);
- ::encode(service_id, a->bl);
-
- ::encode(ticket, a->bl);
-
- CephXAuthorize msg;
- msg.nonce = a->nonce;
-
- std::string error;
- if (encode_encrypt(cct, msg, session_key, a->bl, error)) {
- ldout(cct, 0) << "failed to encrypt authorizer: " << error << dendl;
- delete a;
- return 0;
- }
- return a;
-}
-
-/*
- * PRINCIPAL: build authorizer to access the service.
- *
- * ticket, {timestamp}^session_key
- */
-CephXAuthorizer *CephXTicketManager::build_authorizer(uint32_t service_id) const
-{
- map<uint32_t, CephXTicketHandler>::const_iterator iter = tickets_map.find(service_id);
- if (iter == tickets_map.end()) {
- ldout(cct, 0) << "no TicketHandler for service "
- << ceph_entity_type_name(service_id) << dendl;
- return NULL;
- }
-
- const CephXTicketHandler& handler = iter->second;
- return handler.build_authorizer(global_id);
-}
-
-void CephXTicketManager::validate_tickets(uint32_t mask, uint32_t& have, uint32_t& need)
-{
- uint32_t i;
- need = 0;
- for (i = 1; i<=mask; i<<=1) {
- if (mask & i) {
- set_have_need_key(i, have, need);
- }
- }
- ldout(cct, 10) << "validate_tickets want " << mask << " have " << have
- << " need " << need << dendl;
-}
-
-bool cephx_decode_ticket(CephContext *cct, KeyStore *keys, uint32_t service_id,
- CephXTicketBlob& ticket_blob, CephXServiceTicketInfo& ticket_info)
-{
- uint64_t secret_id = ticket_blob.secret_id;
- CryptoKey service_secret;
-
- if (!ticket_blob.blob.length()) {
- return false;
- }
-
- if (secret_id == (uint64_t)-1) {
- if (!keys->get_secret(cct->_conf->name, service_secret)) {
- ldout(cct, 0) << "ceph_decode_ticket could not get general service secret for service_id="
- << ceph_entity_type_name(service_id) << " secret_id=" << secret_id << dendl;
- return false;
- }
- } else {
- if (!keys->get_service_secret(service_id, secret_id, service_secret)) {
- ldout(cct, 0) << "ceph_decode_ticket could not get service secret for service_id="
- << ceph_entity_type_name(service_id) << " secret_id=" << secret_id << dendl;
- return false;
- }
- }
-
- std::string error;
- decode_decrypt_enc_bl(cct, ticket_info, service_secret, ticket_blob.blob, error);
- if (!error.empty()) {
- ldout(cct, 0) << "ceph_decode_ticket could not decrypt ticket info. error:"
- << error << dendl;
- return false;
- }
-
- return true;
-}
-
-/*
- * SERVICE: verify authorizer and generate reply authorizer
- *
- * {timestamp + 1}^session_key
- */
-bool cephx_verify_authorizer(CephContext *cct, KeyStore *keys,
- bufferlist::iterator& indata,
- CephXServiceTicketInfo& ticket_info, bufferlist& reply_bl)
-{
- __u8 authorizer_v;
- uint32_t service_id;
- uint64_t global_id;
- CryptoKey service_secret;
- // ticket blob
- CephXTicketBlob ticket;
-
-
- try {
- ::decode(authorizer_v, indata);
- ::decode(global_id, indata);
- ::decode(service_id, indata);
- ::decode(ticket, indata);
- } catch (buffer::end_of_buffer &e) {
- // Unable to decode!
- return false;
- }
- ldout(cct, 10) << "verify_authorizer decrypted service "
- << ceph_entity_type_name(service_id)
- << " secret_id=" << ticket.secret_id << dendl;
-
- if (ticket.secret_id == (uint64_t)-1) {
- EntityName name;
- name.set_type(service_id);
- if (!keys->get_secret(name, service_secret)) {
- ldout(cct, 0) << "verify_authorizer could not get general service secret for service "
- << ceph_entity_type_name(service_id) << " secret_id=" << ticket.secret_id << dendl;
- return false;
- }
- } else {
- if (!keys->get_service_secret(service_id, ticket.secret_id, service_secret)) {
- ldout(cct, 0) << "verify_authorizer could not get service secret for service "
- << ceph_entity_type_name(service_id) << " secret_id=" << ticket.secret_id << dendl;
- if (cct->_conf->auth_debug && ticket.secret_id == 0)
- assert(0 == "got secret_id=0");
- return false;
- }
- }
- std::string error;
- if (!service_secret.get_secret().length())
- error = "invalid key"; // Bad key?
- else
- decode_decrypt_enc_bl(cct, ticket_info, service_secret, ticket.blob, error);
- if (!error.empty()) {
- ldout(cct, 0) << "verify_authorizer could not decrypt ticket info: error: "
- << error << dendl;
- return false;
- }
-
- if (ticket_info.ticket.global_id != global_id) {
- ldout(cct, 0) << "verify_authorizer global_id mismatch: declared id=" << global_id
- << " ticket_id=" << ticket_info.ticket.global_id << dendl;
- return false;
- }
-
- ldout(cct, 10) << "verify_authorizer global_id=" << global_id << dendl;
-
- // CephXAuthorize
- CephXAuthorize auth_msg;
- if (decode_decrypt(cct, auth_msg, ticket_info.session_key, indata, error)) {
- ldout(cct, 0) << "verify_authorizercould not decrypt authorize request with error: "
- << error << dendl;
- return false;
- }
-
- /*
- * Reply authorizer:
- * {timestamp + 1}^session_key
- */
- CephXAuthorizeReply reply;
- // reply.trans_id = auth_msg.trans_id;
- reply.nonce_plus_one = auth_msg.nonce + 1;
- if (encode_encrypt(cct, reply, ticket_info.session_key, reply_bl, error)) {
- ldout(cct, 10) << "verify_authorizer: encode_encrypt error: " << error << dendl;
- return false;
- }
-
- ldout(cct, 10) << "verify_authorizer ok nonce " << hex << auth_msg.nonce << dec
- << " reply_bl.length()=" << reply_bl.length() << dendl;
- return true;
-}
-
-bool CephXAuthorizer::verify_reply(bufferlist::iterator& indata)
-{
- CephXAuthorizeReply reply;
-
- std::string error;
- if (decode_decrypt(cct, reply, session_key, indata, error)) {
- ldout(cct, 0) << "verify_reply couldn't decrypt with error: " << error << dendl;
- return false;
- }
-
- uint64_t expect = nonce + 1;
- if (expect != reply.nonce_plus_one) {
- ldout(cct, 0) << "verify_authorizer_reply bad nonce got " << reply.nonce_plus_one << " expected " << expect
- << " sent " << nonce << dendl;
- return false;
- }
- return true;
-}
-
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