Remove logging functionality

Concerns have been raised that including logging functionality makes it harder
to audit the implementation to ensure that no secret information is leaked. We
are therefore removing it from the master branch.

6 files changed, 0 insertions, 164 deletions

diff --git a/src/account.cpp b/src/account.cpp
index d34110a..e5cbfab 100644
--- a/src/account.cpp
+++ b/src/account.cpp
@@ -14,12 +14,9 @@
  */
 #include "olm/account.hh"
 #include "olm/base64.hh"
-#include "olm/logging.h"
 #include "olm/pickle.hh"
 #include "olm/memory.hh"
 
-static const char *LOG_CATEGORY = "olm::Account";
-
 olm::Account::Account(
 ) : next_one_time_key_id(0),
     last_error(olm::ErrorCode::SUCCESS) {
@@ -45,11 +42,9 @@ std::size_t olm::Account::remove_key(
         if (olm::array_equal(i->key.public_key, public_key.public_key)) {
             std::uint32_t id = i->id;
             one_time_keys.erase(i);
-            olm_logf(OLM_LOG_INFO, LOG_CATEGORY, "removed key id %i", id);
             return id;
         }
     }
-    olm_logf(OLM_LOG_WARNING, LOG_CATEGORY, "Couldn't find key to remove");
     return std::size_t(-1);
 }
 
@@ -69,8 +64,6 @@ std::size_t olm::Account::new_account(
     random += KEY_LENGTH;
     olm::curve25519_generate_key(random, identity_keys.curve25519_key);
 
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Created new account");
-
     return 0;
 }
 
diff --git a/src/logging.c b/src/logging.c
deleted file mode 100644
index ce17167..0000000
--- a/src/logging.c
+++ /dev/null
@@ -1,47 +0,0 @@
-/* Copyright 2016 OpenMarket Ltd
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "olm/logging.h"
-
-#include <stdarg.h>
-#include <stdio.h>
-
-static unsigned int log_level = 1;
-
-void olm_set_log_level(unsigned int level) {
-    log_level = level;
-}
-
-int olm_log_enabled_for(unsigned int level, const char *category)
-{
-    return level <= log_level;
-}
-
-void olm_logf(unsigned int level, const char *category,
-          const char *format, ...) {
-    if (level > log_level) {
-        return;
-    }
-
-    fputs(category, stdout);
-    fputs(": ", stdout);
-
-    va_list ap;
-    va_start(ap, format);
-    vprintf(format, ap);
-    va_end(ap);
-
-    putchar('\n');
-}
diff --git a/src/message.cpp b/src/message.cpp
index ff03903..1c93eb8 100644
--- a/src/message.cpp
+++ b/src/message.cpp
@@ -14,13 +14,10 @@
  */
 #include "olm/message.hh"
 
-#include "olm/logging.h"
 #include "olm/memory.hh"
 
 namespace {
 
-static const char *LOG_CATEGORY = "olm::Message";
-
 template<typename T>
 static std::size_t varint_length(
     T value
@@ -239,13 +236,6 @@ void olm::decode_message(
         }
         unknown = pos;
     }
-    olm_logf(OLM_LOG_TRACE, LOG_CATEGORY,
-              "Decoded message ver=%i ratchet_key=%s chain_idx=%i ciphertext=%s",
-              reader.version,
-              olm::bytes_to_string(reader.ratchet_key, reader.ratchet_key_length).c_str(),
-              reader.has_counter ? reader.counter : -1,
-              olm::bytes_to_string(reader.ciphertext, reader.ciphertext_length).c_str()
-    );
 }
 
 
@@ -334,14 +324,4 @@ void olm::decode_one_time_key_message(
         }
         unknown = pos;
     }
-
-    olm_logf(OLM_LOG_TRACE, LOG_CATEGORY,
-              "Decoded pre-key message ver=%i one_time_key[Eb]=%s "
-              "base_key[Ea]=%s identity_key[Ia]=%s message=%s",
-              reader.version,
-              olm::bytes_to_string(reader.one_time_key, reader.one_time_key_length).c_str(),
-              olm::bytes_to_string(reader.base_key, reader.base_key_length).c_str(),
-              olm::bytes_to_string(reader.identity_key, reader.identity_key_length).c_str(),
-              olm::bytes_to_string(reader.message, reader.message_length).c_str()
-    );
 }
diff --git a/src/olm.cpp b/src/olm.cpp
index afbbbc6..63f3d83 100644
--- a/src/olm.cpp
+++ b/src/olm.cpp
@@ -19,7 +19,6 @@
 #include "olm/base64.hh"
 #include "olm/cipher.hh"
 #include "olm/memory.hh"
-#include "olm/logging.h"
 
 #include <new>
 #include <cstring>
diff --git a/src/ratchet.cpp b/src/ratchet.cpp
index 06912af..b04099f 100644
--- a/src/ratchet.cpp
+++ b/src/ratchet.cpp
@@ -17,14 +17,11 @@
 #include "olm/memory.hh"
 #include "olm/cipher.hh"
 #include "olm/pickle.hh"
-#include "olm/logging.h"
 
 #include <cstring>
 
 namespace {
 
-static const char *LOG_CATEGORY = "olm::Ratchet";
-
 static const std::uint8_t PROTOCOL_VERSION = 3;
 static const std::uint8_t MESSAGE_KEY_SEED[1] = {0x01};
 static const std::uint8_t CHAIN_KEY_SEED[1] = {0x02};
@@ -79,8 +76,6 @@ static void advance_chain_key(
         new_chain_key.key
     );
     new_chain_key.index = chain_key.index + 1;
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Derived chain key C(%i,%i)",
-              chain_index, new_chain_key.index);
 }
 
 
@@ -95,8 +90,6 @@ static void create_message_keys(
         message_key.key
     );
     message_key.index = chain_key.index;
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Created message key with chain key C(%i,%i)",
-              chain_index, message_key.index);
 }
 
 
@@ -176,9 +169,6 @@ static std::size_t verify_mac_and_decrypt_for_new_chain(
         new_chain.ratchet_key, session.kdf_info,
         new_root_key, new_chain.chain_key
     );
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Calculated new receiver chain R(%i)",
-                  chain_index);
-
     std::size_t result = verify_mac_and_decrypt_for_existing_chain(
         session, chain_index, new_chain.chain_key, reader,
         plaintext, max_plaintext_length
@@ -219,7 +209,6 @@ void olm::Ratchet::initialise_as_bob(
     receiver_chains[0].ratchet_key = their_ratchet_key;
     chain_index = 0;
     olm::unset(derived_secrets);
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Initialised receiver chain R(0)");
 }
 
 
@@ -242,7 +231,6 @@ void olm::Ratchet::initialise_as_alice(
     sender_chain[0].ratchet_key = our_ratchet_key;
     chain_index = 0;
     olm::unset(derived_secrets);
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Initialised sender chain R(0)");
 }
 
 namespace olm {
@@ -450,9 +438,6 @@ std::size_t olm::Ratchet::encrypt(
     if (sender_chain.empty()) {
         sender_chain.insert();
         olm::curve25519_generate_key(random, sender_chain[0].ratchet_key);
-        olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Created new ratchet key T(%i) %s",
-                  chain_index + 1,
-                  sender_chain[0].ratchet_key.to_string().c_str());
         create_chain_key(
             root_key,
             sender_chain[0].ratchet_key,
@@ -460,8 +445,6 @@ std::size_t olm::Ratchet::encrypt(
             kdf_info,
             root_key, sender_chain[0].chain_key
         );
-        olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Initialised new sender chain R(%i)",
-                  chain_index + 1);
         chain_index++;
     }
 
@@ -491,14 +474,6 @@ std::size_t olm::Ratchet::encrypt(
         output, output_length
     );
 
-    olm_logf(OLM_LOG_TRACE, LOG_CATEGORY,
-              "Encoded message ver=%i ratchet_key=%s chain_idx=%i ciphertext=%s",
-              PROTOCOL_VERSION,
-              olm::bytes_to_string(writer.ratchet_key, olm::KEY_LENGTH).c_str(),
-              counter,
-              olm::bytes_to_string(writer.ciphertext, ciphertext_length).c_str()
-    );
-
     olm::unset(keys);
     return output_length;
 }
@@ -525,10 +500,6 @@ std::size_t olm::Ratchet::decrypt(
     std::uint8_t const * input, std::size_t input_length,
     std::uint8_t * plaintext, std::size_t max_plaintext_length
 ) {
-    olm_logf(OLM_LOG_TRACE, LOG_CATEGORY,
-              "Decrypting message %s",
-              olm::bytes_to_string(input, input_length).c_str());
-
     olm::MessageReader reader;
     olm::decode_message(
         reader, input, input_length, ratchet_cipher.mac_length()
@@ -580,8 +551,6 @@ std::size_t olm::Ratchet::decrypt(
     std::size_t result = std::size_t(-1);
 
     if (!chain) {
-        olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY,
-                  "Sender ratchet key does not match known chain; starting new one");
         result = verify_mac_and_decrypt_for_new_chain(
             *this, reader, plaintext, max_plaintext_length
         );
@@ -642,8 +611,6 @@ std::size_t olm::Ratchet::decrypt(
         olm::unset(sender_chain[0]);
         sender_chain.erase(sender_chain.begin());
         receiver_chain_index = ++chain_index;
-        olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Initialised new receiver chain R(%i)",
-                  chain_index);
     }
 
     while (chain->chain_key.index < reader.counter) {
diff --git a/src/session.cpp b/src/session.cpp
index 816dd26..86ba63b 100644
--- a/src/session.cpp
+++ b/src/session.cpp
@@ -16,7 +16,6 @@
 #include "olm/cipher.hh"
 #include "olm/crypto.hh"
 #include "olm/account.hh"
-#include "olm/logging.h"
 #include "olm/memory.hh"
 #include "olm/message.hh"
 #include "olm/pickle.hh"
@@ -25,8 +24,6 @@
 
 namespace {
 
-static const char *LOG_CATEGORY = "olm::Session";
-
 static const std::uint8_t PROTOCOL_VERSION = 0x3;
 
 static const std::uint8_t ROOT_KDF_INFO[] = "OLM_ROOT";
@@ -68,21 +65,11 @@ std::size_t olm::Session::new_outbound_session(
         return std::size_t(-1);
     }
 
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY,
-              "Creating new outbound session to receiver identity IB %s, "
-              "receiver ephemeral EB %s", identity_key.to_string().c_str(),
-              one_time_key.to_string().c_str()
-    );
-
     olm::Curve25519KeyPair base_key;
     olm::curve25519_generate_key(random, base_key);
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Created new ephemeral key EA %s",
-              base_key.to_string().c_str());
 
     olm::Curve25519KeyPair ratchet_key;
     olm::curve25519_generate_key(random + olm::KEY_LENGTH, ratchet_key);
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Created new ratchet key T(0) %s",
-              ratchet_key.to_string().c_str());
 
     olm::Curve25519KeyPair const & alice_identity_key_pair = (
         local_account.identity_keys.curve25519_key
@@ -108,7 +95,6 @@ std::size_t olm::Session::new_outbound_session(
     olm::unset(ratchet_key);
     olm::unset(secret);
 
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Initialised outbound session");
     return std::size_t(0);
 }
 
@@ -151,13 +137,6 @@ std::size_t olm::Session::new_inbound_session(
             their_identity_key->public_key, reader.identity_key, olm::KEY_LENGTH
         );
         if (!same) {
-            olm_logf(OLM_LOG_INFO, LOG_CATEGORY,
-                      "Identity key on received message is incorrect "
-                      "(expected %s, got %s)",
-                      their_identity_key->to_string().c_str(),
-                      olm::bytes_to_string(reader.identity_key,
-                                           reader.identity_key + olm::KEY_LENGTH)
-                          .c_str());
             last_error = olm::ErrorCode::BAD_MESSAGE_KEY_ID;
             return std::size_t(-1);
         }
@@ -167,13 +146,6 @@ std::size_t olm::Session::new_inbound_session(
     olm::load_array(alice_base_key.public_key, reader.base_key);
     olm::load_array(bob_one_time_key.public_key, reader.one_time_key);
 
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY,
-              "Creating new inbound session from sender identity IA %s, "
-              "sender ephemeral EA %s, our ephemeral EB %s",
-              alice_identity_key.to_string().c_str(),
-              alice_base_key.to_string().c_str(),
-              bob_one_time_key.to_string().c_str());
-
     olm::MessageReader message_reader;
     decode_message(
         message_reader, reader.message, reader.message_length,
@@ -189,17 +161,11 @@ std::size_t olm::Session::new_inbound_session(
     olm::Curve25519PublicKey ratchet_key;
     olm::load_array(ratchet_key.public_key, message_reader.ratchet_key);
 
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY,
-              "Received ratchet key T(0) %s", ratchet_key.to_string().c_str());
-
     olm::OneTimeKey const * our_one_time_key = local_account.lookup_key(
         bob_one_time_key
     );
 
     if (!our_one_time_key) {
-        olm_logf(OLM_LOG_INFO, LOG_CATEGORY,
-                  "Session uses unknown ephemeral key %s",
-                  bob_one_time_key.to_string().c_str());
         last_error = olm::ErrorCode::BAD_MESSAGE_KEY_ID;
         return std::size_t(-1);
     }
@@ -221,7 +187,6 @@ std::size_t olm::Session::new_inbound_session(
 
     olm::unset(secret);
 
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Initialised inbound session");
     return std::size_t(0);
 }
 
@@ -320,9 +285,6 @@ std::size_t olm::Session::encrypt(
     std::uint8_t const * random, std::size_t random_length,
     std::uint8_t * message, std::size_t message_length
 ) {
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Encrypting '%.*s'",
-              (int)plaintext_length, plaintext);
-
     if (message_length < encrypt_message_length(plaintext_length)) {
         last_error = olm::ErrorCode::OUTPUT_BUFFER_TOO_SMALL;
         return std::size_t(-1);
@@ -349,16 +311,6 @@ std::size_t olm::Session::encrypt(
         olm::store_array(writer.identity_key, alice_identity_key.public_key);
         olm::store_array(writer.base_key, alice_base_key.public_key);
         message_body = writer.message;
-
-
-        olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY,
-                  "Encoded pre-key message ver=%i one_time_key[Eb]=%s "
-                  "base_key[Ea]=%s identity_key[Ia]=%s",
-                  PROTOCOL_VERSION,
-                  olm::bytes_to_string(writer.one_time_key, olm::KEY_LENGTH).c_str(),
-                  olm::bytes_to_string(writer.base_key, olm::KEY_LENGTH).c_str(),
-                  olm::bytes_to_string(writer.identity_key, olm::KEY_LENGTH).c_str()
-        );
     }
 
     std::size_t result = ratchet.encrypt(
@@ -373,9 +325,6 @@ std::size_t olm::Session::encrypt(
         return result;
     }
 
-    olm_logf(OLM_LOG_TRACE, LOG_CATEGORY, "Encrypted message %s",
-              olm::bytes_to_string(message_body, result).c_str());
-
     return result;
 }
 
@@ -417,9 +366,6 @@ std::size_t olm::Session::decrypt(
     std::uint8_t const * message, std::size_t message_length,
     std::uint8_t * plaintext, std::size_t max_plaintext_length
 ) {
-    olm_logf(OLM_LOG_TRACE, LOG_CATEGORY, "Decrypting %smessage",
-              message_type == olm::MessageType::MESSAGE ? "" : "pre-key ");
-
     std::uint8_t const * message_body;
     std::size_t message_body_length;
     if (message_type == olm::MessageType::MESSAGE) {
@@ -447,8 +393,6 @@ std::size_t olm::Session::decrypt(
     }
 
     received_message = true;
-    olm_logf(OLM_LOG_DEBUG, LOG_CATEGORY, "Decrypted '%.*s'",
-              (int)result, plaintext);
     return result;
 }