Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 604 insertions, 0 deletions

diff --git a/src/auth/cephx/CephxProtocol.cc b/src/auth/cephx/CephxProtocol.cc
new file mode 100644
index 000000000..87a8b86b9
--- /dev/null
+++ b/src/auth/cephx/CephxProtocol.cc
@@ -0,0 +1,604 @@
+// -*- 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/ceph_context.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: "
+
+using std::dec;
+using std::hex;
+using std::vector;
+
+using ceph::bufferlist;
+using ceph::decode;
+using ceph::encode;
+
+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 ceph_le64 *p = (const ceph_le64 *)enc.c_str();
+  for (int pos = 0; pos + sizeof(k) <= enc.length(); pos+=sizeof(k), p++)
+    k ^= *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()
+		 << " ticket.global_id " << info.ticket.global_id << 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;
+  using ceph::encode;
+  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 (auto 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::const_iterator& indata)
+{
+  using ceph::decode;
+  try {
+    __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) << __func__ << " 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) << __func__ << " got encrypted ticket" << dendl;
+      std::string error;
+      if (decode_decrypt(cct, service_ticket_bl, session_key, indata, error)) {
+	ldout(cct, 10) << __func__ << " decode_decrypt failed "
+		       << "with " << error << dendl;
+	return false;
+      }
+    } else {
+      decode(service_ticket_bl, indata);
+    }
+    auto iter = service_ticket_bl.cbegin();
+    decode(ticket, iter);
+    ldout(cct, 10) << __func__ << " ticket.secret_id=" <<  ticket.secret_id
+		   << dendl;
+
+    ldout(cct, 10) << __func__ << " 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) << __func__ << " ticket expires=" << expires
+		     << " renew_after=" << renew_after << dendl;
+    }
+
+    have_key_flag = true;
+    return true;
+  } catch (ceph::buffer::error& e) {
+    ldout(cct, 1) << __func__ << " decode error: " << e.what() << dendl;
+    return false;
+  }
+}
+
+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)
+{
+  auto 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
+{
+  auto 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)
+{
+  auto 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)
+{
+  auto 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::const_iterator& indata)
+{
+  __u8 service_ticket_reply_v;
+  uint32_t num = 0;
+  try {
+    decode(service_ticket_reply_v, indata);
+    decode(num, indata);
+  } catch (ceph::buffer::error& e) {
+    ldout(cct, 10) << __func__ << " failed to decode ticket v or count: "
+		   << e.what() << dendl;
+  }
+  ldout(cct, 10) << "verify_service_ticket_reply got " << num << " keys" << dendl;
+
+  for (int i=0; i<(int)num; i++) {
+    uint32_t type = 0;
+    try {
+      decode(type, indata);
+    } catch (ceph::buffer::error& e) {
+      ldout(cct, 10) << __func__ << " failed to decode ticket type: " << e.what()
+		     << dendl;
+    }
+    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;
+  }
+
+  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;
+  cct->random()->get_bytes((char*)&a->nonce, sizeof(a->nonce));
+
+  __u8 authorizer_v = 1; // see AUTH_MODE_* in Auth.h
+  encode(authorizer_v, a->bl);
+  encode(global_id, a->bl);
+  encode(service_id, a->bl);
+
+  encode(ticket, a->bl);
+  a->base_bl = 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
+{
+  auto 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,
+			 const 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, const KeyStore& keys,
+			     bufferlist::const_iterator& indata,
+			     size_t connection_secret_required_len,
+			     CephXServiceTicketInfo& ticket_info,
+			     std::unique_ptr<AuthAuthorizerChallenge> *challenge,
+			     std::string *connection_secret,
+			     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 (ceph::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)
+	ceph_abort_msg("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;
+  }
+
+  if (challenge) {
+    auto *c = static_cast<CephXAuthorizeChallenge*>(challenge->get());
+    if (!auth_msg.have_challenge || !c) {
+      c = new CephXAuthorizeChallenge;
+      challenge->reset(c);
+      cct->random()->get_bytes((char*)&c->server_challenge, sizeof(c->server_challenge));
+      ldout(cct,10) << __func__ << " adding server_challenge " << c->server_challenge
+		    << dendl;
+
+      encode_encrypt_enc_bl(cct, *c, ticket_info.session_key, *reply_bl, error);
+      if (!error.empty()) {
+	ldout(cct, 10) << "verify_authorizer: encode_encrypt error: " << error << dendl;
+	return false;
+      }
+      return false;
+    }
+    ldout(cct, 10) << __func__ << " got server_challenge+1 "
+		   << auth_msg.server_challenge_plus_one
+		   << " expecting " << c->server_challenge + 1 << dendl;
+    if (c->server_challenge + 1 != auth_msg.server_challenge_plus_one) {
+      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 (connection_secret) {
+    // generate a connection secret
+    connection_secret->resize(connection_secret_required_len);
+    if (connection_secret_required_len) {
+#ifdef WITH_SEASTAR
+      std::random_device rd;
+      std::generate_n(connection_secret->data(),
+		      connection_secret_required_len,
+		      std::default_random_engine{rd()});
+#else
+      cct->random()->get_bytes(connection_secret->data(),
+			       connection_secret_required_len);
+#endif
+    }
+    reply.connection_secret = *connection_secret;
+  }
+  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::const_iterator& indata,
+				   std::string *connection_secret)
+{
+  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;
+  }
+
+  if (connection_secret &&
+      reply.connection_secret.size()) {
+    *connection_secret = reply.connection_secret;
+  }
+  return true;
+}
+
+bool CephXAuthorizer::add_challenge(CephContext *cct,
+				    const bufferlist& challenge)
+{
+  bl = base_bl;
+
+  CephXAuthorize msg;
+  msg.nonce = nonce;
+
+  auto p = challenge.begin();
+  if (!p.end()) {
+    std::string error;
+    CephXAuthorizeChallenge ch;
+    decode_decrypt_enc_bl(cct, ch, session_key, challenge, error);
+    if (!error.empty()) {
+      ldout(cct, 0) << "failed to decrypt challenge (" << challenge.length() << " bytes): "
+		    << error << dendl;
+      return false;
+    }
+    msg.have_challenge = true;
+    msg.server_challenge_plus_one = ch.server_challenge + 1;
+  }
+
+  std::string error;
+  if (encode_encrypt(cct, msg, session_key, bl, error)) {
+    ldout(cct, 0) << __func__ << " failed to encrypt authorizer: " << error << dendl;
+    return false;
+  }
+  return true;
+}