| /* |
| * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "webrtc/p2p/base/stun.h" |
| |
| #include <string.h> |
| |
| #include <memory> |
| |
| #include "webrtc/base/byteorder.h" |
| #include "webrtc/base/common.h" |
| #include "webrtc/base/crc32.h" |
| #include "webrtc/base/logging.h" |
| #include "webrtc/base/messagedigest.h" |
| #include "webrtc/base/stringencode.h" |
| |
| using rtc::ByteBufferReader; |
| using rtc::ByteBufferWriter; |
| |
| namespace cricket { |
| |
| const char STUN_ERROR_REASON_TRY_ALTERNATE_SERVER[] = "Try Alternate Server"; |
| const char STUN_ERROR_REASON_BAD_REQUEST[] = "Bad Request"; |
| const char STUN_ERROR_REASON_UNAUTHORIZED[] = "Unauthorized"; |
| const char STUN_ERROR_REASON_FORBIDDEN[] = "Forbidden"; |
| const char STUN_ERROR_REASON_STALE_CREDENTIALS[] = "Stale Credentials"; |
| const char STUN_ERROR_REASON_ALLOCATION_MISMATCH[] = "Allocation Mismatch"; |
| const char STUN_ERROR_REASON_STALE_NONCE[] = "Stale Nonce"; |
| const char STUN_ERROR_REASON_WRONG_CREDENTIALS[] = "Wrong Credentials"; |
| const char STUN_ERROR_REASON_UNSUPPORTED_PROTOCOL[] = "Unsupported Protocol"; |
| const char STUN_ERROR_REASON_ROLE_CONFLICT[] = "Role Conflict"; |
| const char STUN_ERROR_REASON_SERVER_ERROR[] = "Server Error"; |
| |
| const char TURN_MAGIC_COOKIE_VALUE[] = { '\x72', '\xC6', '\x4B', '\xC6' }; |
| const char EMPTY_TRANSACTION_ID[] = "0000000000000000"; |
| const uint32_t STUN_FINGERPRINT_XOR_VALUE = 0x5354554E; |
| |
| // StunMessage |
| |
| StunMessage::StunMessage() |
| : type_(0), |
| length_(0), |
| transaction_id_(EMPTY_TRANSACTION_ID) { |
| ASSERT(IsValidTransactionId(transaction_id_)); |
| attrs_ = new std::vector<StunAttribute*>(); |
| } |
| |
| StunMessage::~StunMessage() { |
| for (size_t i = 0; i < attrs_->size(); i++) |
| delete (*attrs_)[i]; |
| delete attrs_; |
| } |
| |
| bool StunMessage::IsLegacy() const { |
| if (transaction_id_.size() == kStunLegacyTransactionIdLength) |
| return true; |
| ASSERT(transaction_id_.size() == kStunTransactionIdLength); |
| return false; |
| } |
| |
| bool StunMessage::SetTransactionID(const std::string& str) { |
| if (!IsValidTransactionId(str)) { |
| return false; |
| } |
| transaction_id_ = str; |
| return true; |
| } |
| |
| bool StunMessage::AddAttribute(StunAttribute* attr) { |
| // Fail any attributes that aren't valid for this type of message. |
| if (attr->value_type() != GetAttributeValueType(attr->type())) { |
| return false; |
| } |
| attrs_->push_back(attr); |
| attr->SetOwner(this); |
| size_t attr_length = attr->length(); |
| if (attr_length % 4 != 0) { |
| attr_length += (4 - (attr_length % 4)); |
| } |
| length_ += static_cast<uint16_t>(attr_length + 4); |
| return true; |
| } |
| |
| const StunAddressAttribute* StunMessage::GetAddress(int type) const { |
| switch (type) { |
| case STUN_ATTR_MAPPED_ADDRESS: { |
| // Return XOR-MAPPED-ADDRESS when MAPPED-ADDRESS attribute is |
| // missing. |
| const StunAttribute* mapped_address = |
| GetAttribute(STUN_ATTR_MAPPED_ADDRESS); |
| if (!mapped_address) |
| mapped_address = GetAttribute(STUN_ATTR_XOR_MAPPED_ADDRESS); |
| return reinterpret_cast<const StunAddressAttribute*>(mapped_address); |
| } |
| |
| default: |
| return static_cast<const StunAddressAttribute*>(GetAttribute(type)); |
| } |
| } |
| |
| const StunUInt32Attribute* StunMessage::GetUInt32(int type) const { |
| return static_cast<const StunUInt32Attribute*>(GetAttribute(type)); |
| } |
| |
| const StunUInt64Attribute* StunMessage::GetUInt64(int type) const { |
| return static_cast<const StunUInt64Attribute*>(GetAttribute(type)); |
| } |
| |
| const StunByteStringAttribute* StunMessage::GetByteString(int type) const { |
| return static_cast<const StunByteStringAttribute*>(GetAttribute(type)); |
| } |
| |
| const StunErrorCodeAttribute* StunMessage::GetErrorCode() const { |
| return static_cast<const StunErrorCodeAttribute*>( |
| GetAttribute(STUN_ATTR_ERROR_CODE)); |
| } |
| |
| const StunUInt16ListAttribute* StunMessage::GetUnknownAttributes() const { |
| return static_cast<const StunUInt16ListAttribute*>( |
| GetAttribute(STUN_ATTR_UNKNOWN_ATTRIBUTES)); |
| } |
| |
| // Verifies a STUN message has a valid MESSAGE-INTEGRITY attribute, using the |
| // procedure outlined in RFC 5389, section 15.4. |
| bool StunMessage::ValidateMessageIntegrity(const char* data, size_t size, |
| const std::string& password) { |
| // Verifying the size of the message. |
| if ((size % 4) != 0 || size < kStunHeaderSize) { |
| return false; |
| } |
| |
| // Getting the message length from the STUN header. |
| uint16_t msg_length = rtc::GetBE16(&data[2]); |
| if (size != (msg_length + kStunHeaderSize)) { |
| return false; |
| } |
| |
| // Finding Message Integrity attribute in stun message. |
| size_t current_pos = kStunHeaderSize; |
| bool has_message_integrity_attr = false; |
| while (current_pos + 4 <= size) { |
| uint16_t attr_type, attr_length; |
| // Getting attribute type and length. |
| attr_type = rtc::GetBE16(&data[current_pos]); |
| attr_length = rtc::GetBE16(&data[current_pos + sizeof(attr_type)]); |
| |
| // If M-I, sanity check it, and break out. |
| if (attr_type == STUN_ATTR_MESSAGE_INTEGRITY) { |
| if (attr_length != kStunMessageIntegritySize || |
| current_pos + sizeof(attr_type) + sizeof(attr_length) + attr_length > |
| size) { |
| return false; |
| } |
| has_message_integrity_attr = true; |
| break; |
| } |
| |
| // Otherwise, skip to the next attribute. |
| current_pos += sizeof(attr_type) + sizeof(attr_length) + attr_length; |
| if ((attr_length % 4) != 0) { |
| current_pos += (4 - (attr_length % 4)); |
| } |
| } |
| |
| if (!has_message_integrity_attr) { |
| return false; |
| } |
| |
| // Getting length of the message to calculate Message Integrity. |
| size_t mi_pos = current_pos; |
| std::unique_ptr<char[]> temp_data(new char[current_pos]); |
| memcpy(temp_data.get(), data, current_pos); |
| if (size > mi_pos + kStunAttributeHeaderSize + kStunMessageIntegritySize) { |
| // Stun message has other attributes after message integrity. |
| // Adjust the length parameter in stun message to calculate HMAC. |
| size_t extra_offset = size - |
| (mi_pos + kStunAttributeHeaderSize + kStunMessageIntegritySize); |
| size_t new_adjusted_len = size - extra_offset - kStunHeaderSize; |
| |
| // Writing new length of the STUN message @ Message Length in temp buffer. |
| // 0 1 2 3 |
| // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // |0 0| STUN Message Type | Message Length | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| rtc::SetBE16(temp_data.get() + 2, static_cast<uint16_t>(new_adjusted_len)); |
| } |
| |
| char hmac[kStunMessageIntegritySize]; |
| size_t ret = rtc::ComputeHmac(rtc::DIGEST_SHA_1, |
| password.c_str(), password.size(), |
| temp_data.get(), mi_pos, |
| hmac, sizeof(hmac)); |
| ASSERT(ret == sizeof(hmac)); |
| if (ret != sizeof(hmac)) |
| return false; |
| |
| // Comparing the calculated HMAC with the one present in the message. |
| return memcmp(data + current_pos + kStunAttributeHeaderSize, |
| hmac, |
| sizeof(hmac)) == 0; |
| } |
| |
| bool StunMessage::AddMessageIntegrity(const std::string& password) { |
| return AddMessageIntegrity(password.c_str(), password.size()); |
| } |
| |
| bool StunMessage::AddMessageIntegrity(const char* key, |
| size_t keylen) { |
| // Add the attribute with a dummy value. Since this is a known attribute, it |
| // can't fail. |
| StunByteStringAttribute* msg_integrity_attr = |
| new StunByteStringAttribute(STUN_ATTR_MESSAGE_INTEGRITY, |
| std::string(kStunMessageIntegritySize, '0')); |
| VERIFY(AddAttribute(msg_integrity_attr)); |
| |
| // Calculate the HMAC for the message. |
| ByteBufferWriter buf; |
| if (!Write(&buf)) |
| return false; |
| |
| int msg_len_for_hmac = static_cast<int>( |
| buf.Length() - kStunAttributeHeaderSize - msg_integrity_attr->length()); |
| char hmac[kStunMessageIntegritySize]; |
| size_t ret = rtc::ComputeHmac(rtc::DIGEST_SHA_1, |
| key, keylen, |
| buf.Data(), msg_len_for_hmac, |
| hmac, sizeof(hmac)); |
| ASSERT(ret == sizeof(hmac)); |
| if (ret != sizeof(hmac)) { |
| LOG(LS_ERROR) << "HMAC computation failed. Message-Integrity " |
| << "has dummy value."; |
| return false; |
| } |
| |
| // Insert correct HMAC into the attribute. |
| msg_integrity_attr->CopyBytes(hmac, sizeof(hmac)); |
| return true; |
| } |
| |
| // Verifies a message is in fact a STUN message, by performing the checks |
| // outlined in RFC 5389, section 7.3, including the FINGERPRINT check detailed |
| // in section 15.5. |
| bool StunMessage::ValidateFingerprint(const char* data, size_t size) { |
| // Check the message length. |
| size_t fingerprint_attr_size = |
| kStunAttributeHeaderSize + StunUInt32Attribute::SIZE; |
| if (size % 4 != 0 || size < kStunHeaderSize + fingerprint_attr_size) |
| return false; |
| |
| // Skip the rest if the magic cookie isn't present. |
| const char* magic_cookie = |
| data + kStunTransactionIdOffset - kStunMagicCookieLength; |
| if (rtc::GetBE32(magic_cookie) != kStunMagicCookie) |
| return false; |
| |
| // Check the fingerprint type and length. |
| const char* fingerprint_attr_data = data + size - fingerprint_attr_size; |
| if (rtc::GetBE16(fingerprint_attr_data) != STUN_ATTR_FINGERPRINT || |
| rtc::GetBE16(fingerprint_attr_data + sizeof(uint16_t)) != |
| StunUInt32Attribute::SIZE) |
| return false; |
| |
| // Check the fingerprint value. |
| uint32_t fingerprint = |
| rtc::GetBE32(fingerprint_attr_data + kStunAttributeHeaderSize); |
| return ((fingerprint ^ STUN_FINGERPRINT_XOR_VALUE) == |
| rtc::ComputeCrc32(data, size - fingerprint_attr_size)); |
| } |
| |
| bool StunMessage::AddFingerprint() { |
| // Add the attribute with a dummy value. Since this is a known attribute, |
| // it can't fail. |
| StunUInt32Attribute* fingerprint_attr = |
| new StunUInt32Attribute(STUN_ATTR_FINGERPRINT, 0); |
| VERIFY(AddAttribute(fingerprint_attr)); |
| |
| // Calculate the CRC-32 for the message and insert it. |
| ByteBufferWriter buf; |
| if (!Write(&buf)) |
| return false; |
| |
| int msg_len_for_crc32 = static_cast<int>( |
| buf.Length() - kStunAttributeHeaderSize - fingerprint_attr->length()); |
| uint32_t c = rtc::ComputeCrc32(buf.Data(), msg_len_for_crc32); |
| |
| // Insert the correct CRC-32, XORed with a constant, into the attribute. |
| fingerprint_attr->SetValue(c ^ STUN_FINGERPRINT_XOR_VALUE); |
| return true; |
| } |
| |
| bool StunMessage::Read(ByteBufferReader* buf) { |
| if (!buf->ReadUInt16(&type_)) |
| return false; |
| |
| if (type_ & 0x8000) { |
| // RTP and RTCP set the MSB of first byte, since first two bits are version, |
| // and version is always 2 (10). If set, this is not a STUN packet. |
| return false; |
| } |
| |
| if (!buf->ReadUInt16(&length_)) |
| return false; |
| |
| std::string magic_cookie; |
| if (!buf->ReadString(&magic_cookie, kStunMagicCookieLength)) |
| return false; |
| |
| std::string transaction_id; |
| if (!buf->ReadString(&transaction_id, kStunTransactionIdLength)) |
| return false; |
| |
| uint32_t magic_cookie_int = |
| *reinterpret_cast<const uint32_t*>(magic_cookie.data()); |
| if (rtc::NetworkToHost32(magic_cookie_int) != kStunMagicCookie) { |
| // If magic cookie is invalid it means that the peer implements |
| // RFC3489 instead of RFC5389. |
| transaction_id.insert(0, magic_cookie); |
| } |
| ASSERT(IsValidTransactionId(transaction_id)); |
| transaction_id_ = transaction_id; |
| |
| if (length_ != buf->Length()) |
| return false; |
| |
| attrs_->resize(0); |
| |
| size_t rest = buf->Length() - length_; |
| while (buf->Length() > rest) { |
| uint16_t attr_type, attr_length; |
| if (!buf->ReadUInt16(&attr_type)) |
| return false; |
| if (!buf->ReadUInt16(&attr_length)) |
| return false; |
| |
| StunAttribute* attr = CreateAttribute(attr_type, attr_length); |
| if (!attr) { |
| // Skip any unknown or malformed attributes. |
| if ((attr_length % 4) != 0) { |
| attr_length += (4 - (attr_length % 4)); |
| } |
| if (!buf->Consume(attr_length)) |
| return false; |
| } else { |
| if (!attr->Read(buf)) |
| return false; |
| attrs_->push_back(attr); |
| } |
| } |
| |
| ASSERT(buf->Length() == rest); |
| return true; |
| } |
| |
| bool StunMessage::Write(ByteBufferWriter* buf) const { |
| buf->WriteUInt16(type_); |
| buf->WriteUInt16(length_); |
| if (!IsLegacy()) |
| buf->WriteUInt32(kStunMagicCookie); |
| buf->WriteString(transaction_id_); |
| |
| for (size_t i = 0; i < attrs_->size(); ++i) { |
| buf->WriteUInt16((*attrs_)[i]->type()); |
| buf->WriteUInt16(static_cast<uint16_t>((*attrs_)[i]->length())); |
| if (!(*attrs_)[i]->Write(buf)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| StunAttributeValueType StunMessage::GetAttributeValueType(int type) const { |
| switch (type) { |
| case STUN_ATTR_MAPPED_ADDRESS: return STUN_VALUE_ADDRESS; |
| case STUN_ATTR_USERNAME: return STUN_VALUE_BYTE_STRING; |
| case STUN_ATTR_MESSAGE_INTEGRITY: return STUN_VALUE_BYTE_STRING; |
| case STUN_ATTR_ERROR_CODE: return STUN_VALUE_ERROR_CODE; |
| case STUN_ATTR_UNKNOWN_ATTRIBUTES: return STUN_VALUE_UINT16_LIST; |
| case STUN_ATTR_REALM: return STUN_VALUE_BYTE_STRING; |
| case STUN_ATTR_NONCE: return STUN_VALUE_BYTE_STRING; |
| case STUN_ATTR_XOR_MAPPED_ADDRESS: return STUN_VALUE_XOR_ADDRESS; |
| case STUN_ATTR_SOFTWARE: return STUN_VALUE_BYTE_STRING; |
| case STUN_ATTR_ALTERNATE_SERVER: return STUN_VALUE_ADDRESS; |
| case STUN_ATTR_FINGERPRINT: return STUN_VALUE_UINT32; |
| case STUN_ATTR_ORIGIN: return STUN_VALUE_BYTE_STRING; |
| case STUN_ATTR_RETRANSMIT_COUNT: return STUN_VALUE_UINT32; |
| default: return STUN_VALUE_UNKNOWN; |
| } |
| } |
| |
| StunAttribute* StunMessage::CreateAttribute(int type, size_t length) /*const*/ { |
| StunAttributeValueType value_type = GetAttributeValueType(type); |
| return StunAttribute::Create(value_type, type, static_cast<uint16_t>(length), |
| this); |
| } |
| |
| const StunAttribute* StunMessage::GetAttribute(int type) const { |
| for (size_t i = 0; i < attrs_->size(); ++i) { |
| if ((*attrs_)[i]->type() == type) |
| return (*attrs_)[i]; |
| } |
| return NULL; |
| } |
| |
| bool StunMessage::IsValidTransactionId(const std::string& transaction_id) { |
| return transaction_id.size() == kStunTransactionIdLength || |
| transaction_id.size() == kStunLegacyTransactionIdLength; |
| } |
| |
| // StunAttribute |
| |
| StunAttribute::StunAttribute(uint16_t type, uint16_t length) |
| : type_(type), length_(length) { |
| } |
| |
| void StunAttribute::ConsumePadding(ByteBufferReader* buf) const { |
| int remainder = length_ % 4; |
| if (remainder > 0) { |
| buf->Consume(4 - remainder); |
| } |
| } |
| |
| void StunAttribute::WritePadding(ByteBufferWriter* buf) const { |
| int remainder = length_ % 4; |
| if (remainder > 0) { |
| char zeroes[4] = {0}; |
| buf->WriteBytes(zeroes, 4 - remainder); |
| } |
| } |
| |
| StunAttribute* StunAttribute::Create(StunAttributeValueType value_type, |
| uint16_t type, |
| uint16_t length, |
| StunMessage* owner) { |
| switch (value_type) { |
| case STUN_VALUE_ADDRESS: |
| return new StunAddressAttribute(type, length); |
| case STUN_VALUE_XOR_ADDRESS: |
| return new StunXorAddressAttribute(type, length, owner); |
| case STUN_VALUE_UINT32: |
| return new StunUInt32Attribute(type); |
| case STUN_VALUE_UINT64: |
| return new StunUInt64Attribute(type); |
| case STUN_VALUE_BYTE_STRING: |
| return new StunByteStringAttribute(type, length); |
| case STUN_VALUE_ERROR_CODE: |
| return new StunErrorCodeAttribute(type, length); |
| case STUN_VALUE_UINT16_LIST: |
| return new StunUInt16ListAttribute(type, length); |
| default: |
| return NULL; |
| } |
| } |
| |
| StunAddressAttribute* StunAttribute::CreateAddress(uint16_t type) { |
| return new StunAddressAttribute(type, 0); |
| } |
| |
| StunXorAddressAttribute* StunAttribute::CreateXorAddress(uint16_t type) { |
| return new StunXorAddressAttribute(type, 0, NULL); |
| } |
| |
| StunUInt64Attribute* StunAttribute::CreateUInt64(uint16_t type) { |
| return new StunUInt64Attribute(type); |
| } |
| |
| StunUInt32Attribute* StunAttribute::CreateUInt32(uint16_t type) { |
| return new StunUInt32Attribute(type); |
| } |
| |
| StunByteStringAttribute* StunAttribute::CreateByteString(uint16_t type) { |
| return new StunByteStringAttribute(type, 0); |
| } |
| |
| StunErrorCodeAttribute* StunAttribute::CreateErrorCode() { |
| return new StunErrorCodeAttribute( |
| STUN_ATTR_ERROR_CODE, StunErrorCodeAttribute::MIN_SIZE); |
| } |
| |
| StunUInt16ListAttribute* StunAttribute::CreateUnknownAttributes() { |
| return new StunUInt16ListAttribute(STUN_ATTR_UNKNOWN_ATTRIBUTES, 0); |
| } |
| |
| StunAddressAttribute::StunAddressAttribute(uint16_t type, |
| const rtc::SocketAddress& addr) |
| : StunAttribute(type, 0) { |
| SetAddress(addr); |
| } |
| |
| StunAddressAttribute::StunAddressAttribute(uint16_t type, uint16_t length) |
| : StunAttribute(type, length) { |
| } |
| |
| bool StunAddressAttribute::Read(ByteBufferReader* buf) { |
| uint8_t dummy; |
| if (!buf->ReadUInt8(&dummy)) |
| return false; |
| |
| uint8_t stun_family; |
| if (!buf->ReadUInt8(&stun_family)) { |
| return false; |
| } |
| uint16_t port; |
| if (!buf->ReadUInt16(&port)) |
| return false; |
| if (stun_family == STUN_ADDRESS_IPV4) { |
| in_addr v4addr; |
| if (length() != SIZE_IP4) { |
| return false; |
| } |
| if (!buf->ReadBytes(reinterpret_cast<char*>(&v4addr), sizeof(v4addr))) { |
| return false; |
| } |
| rtc::IPAddress ipaddr(v4addr); |
| SetAddress(rtc::SocketAddress(ipaddr, port)); |
| } else if (stun_family == STUN_ADDRESS_IPV6) { |
| in6_addr v6addr; |
| if (length() != SIZE_IP6) { |
| return false; |
| } |
| if (!buf->ReadBytes(reinterpret_cast<char*>(&v6addr), sizeof(v6addr))) { |
| return false; |
| } |
| rtc::IPAddress ipaddr(v6addr); |
| SetAddress(rtc::SocketAddress(ipaddr, port)); |
| } else { |
| return false; |
| } |
| return true; |
| } |
| |
| bool StunAddressAttribute::Write(ByteBufferWriter* buf) const { |
| StunAddressFamily address_family = family(); |
| if (address_family == STUN_ADDRESS_UNDEF) { |
| LOG(LS_ERROR) << "Error writing address attribute: unknown family."; |
| return false; |
| } |
| buf->WriteUInt8(0); |
| buf->WriteUInt8(address_family); |
| buf->WriteUInt16(address_.port()); |
| switch (address_.family()) { |
| case AF_INET: { |
| in_addr v4addr = address_.ipaddr().ipv4_address(); |
| buf->WriteBytes(reinterpret_cast<char*>(&v4addr), sizeof(v4addr)); |
| break; |
| } |
| case AF_INET6: { |
| in6_addr v6addr = address_.ipaddr().ipv6_address(); |
| buf->WriteBytes(reinterpret_cast<char*>(&v6addr), sizeof(v6addr)); |
| break; |
| } |
| } |
| return true; |
| } |
| |
| StunXorAddressAttribute::StunXorAddressAttribute(uint16_t type, |
| const rtc::SocketAddress& addr) |
| : StunAddressAttribute(type, addr), owner_(NULL) { |
| } |
| |
| StunXorAddressAttribute::StunXorAddressAttribute(uint16_t type, |
| uint16_t length, |
| StunMessage* owner) |
| : StunAddressAttribute(type, length), owner_(owner) { |
| } |
| |
| rtc::IPAddress StunXorAddressAttribute::GetXoredIP() const { |
| if (owner_) { |
| rtc::IPAddress ip = ipaddr(); |
| switch (ip.family()) { |
| case AF_INET: { |
| in_addr v4addr = ip.ipv4_address(); |
| v4addr.s_addr = |
| (v4addr.s_addr ^ rtc::HostToNetwork32(kStunMagicCookie)); |
| return rtc::IPAddress(v4addr); |
| } |
| case AF_INET6: { |
| in6_addr v6addr = ip.ipv6_address(); |
| const std::string& transaction_id = owner_->transaction_id(); |
| if (transaction_id.length() == kStunTransactionIdLength) { |
| uint32_t transactionid_as_ints[3]; |
| memcpy(&transactionid_as_ints[0], transaction_id.c_str(), |
| transaction_id.length()); |
| uint32_t* ip_as_ints = reinterpret_cast<uint32_t*>(&v6addr.s6_addr); |
| // Transaction ID is in network byte order, but magic cookie |
| // is stored in host byte order. |
| ip_as_ints[0] = |
| (ip_as_ints[0] ^ rtc::HostToNetwork32(kStunMagicCookie)); |
| ip_as_ints[1] = (ip_as_ints[1] ^ transactionid_as_ints[0]); |
| ip_as_ints[2] = (ip_as_ints[2] ^ transactionid_as_ints[1]); |
| ip_as_ints[3] = (ip_as_ints[3] ^ transactionid_as_ints[2]); |
| return rtc::IPAddress(v6addr); |
| } |
| break; |
| } |
| } |
| } |
| // Invalid ip family or transaction ID, or missing owner. |
| // Return an AF_UNSPEC address. |
| return rtc::IPAddress(); |
| } |
| |
| bool StunXorAddressAttribute::Read(ByteBufferReader* buf) { |
| if (!StunAddressAttribute::Read(buf)) |
| return false; |
| uint16_t xoredport = port() ^ (kStunMagicCookie >> 16); |
| rtc::IPAddress xored_ip = GetXoredIP(); |
| SetAddress(rtc::SocketAddress(xored_ip, xoredport)); |
| return true; |
| } |
| |
| bool StunXorAddressAttribute::Write(ByteBufferWriter* buf) const { |
| StunAddressFamily address_family = family(); |
| if (address_family == STUN_ADDRESS_UNDEF) { |
| LOG(LS_ERROR) << "Error writing xor-address attribute: unknown family."; |
| return false; |
| } |
| rtc::IPAddress xored_ip = GetXoredIP(); |
| if (xored_ip.family() == AF_UNSPEC) { |
| return false; |
| } |
| buf->WriteUInt8(0); |
| buf->WriteUInt8(family()); |
| buf->WriteUInt16(port() ^ (kStunMagicCookie >> 16)); |
| switch (xored_ip.family()) { |
| case AF_INET: { |
| in_addr v4addr = xored_ip.ipv4_address(); |
| buf->WriteBytes(reinterpret_cast<const char*>(&v4addr), sizeof(v4addr)); |
| break; |
| } |
| case AF_INET6: { |
| in6_addr v6addr = xored_ip.ipv6_address(); |
| buf->WriteBytes(reinterpret_cast<const char*>(&v6addr), sizeof(v6addr)); |
| break; |
| } |
| } |
| return true; |
| } |
| |
| StunUInt32Attribute::StunUInt32Attribute(uint16_t type, uint32_t value) |
| : StunAttribute(type, SIZE), bits_(value) { |
| } |
| |
| StunUInt32Attribute::StunUInt32Attribute(uint16_t type) |
| : StunAttribute(type, SIZE), bits_(0) { |
| } |
| |
| bool StunUInt32Attribute::GetBit(size_t index) const { |
| ASSERT(index < 32); |
| return static_cast<bool>((bits_ >> index) & 0x1); |
| } |
| |
| void StunUInt32Attribute::SetBit(size_t index, bool value) { |
| ASSERT(index < 32); |
| bits_ &= ~(1 << index); |
| bits_ |= value ? (1 << index) : 0; |
| } |
| |
| bool StunUInt32Attribute::Read(ByteBufferReader* buf) { |
| if (length() != SIZE || !buf->ReadUInt32(&bits_)) |
| return false; |
| return true; |
| } |
| |
| bool StunUInt32Attribute::Write(ByteBufferWriter* buf) const { |
| buf->WriteUInt32(bits_); |
| return true; |
| } |
| |
| StunUInt64Attribute::StunUInt64Attribute(uint16_t type, uint64_t value) |
| : StunAttribute(type, SIZE), bits_(value) { |
| } |
| |
| StunUInt64Attribute::StunUInt64Attribute(uint16_t type) |
| : StunAttribute(type, SIZE), bits_(0) { |
| } |
| |
| bool StunUInt64Attribute::Read(ByteBufferReader* buf) { |
| if (length() != SIZE || !buf->ReadUInt64(&bits_)) |
| return false; |
| return true; |
| } |
| |
| bool StunUInt64Attribute::Write(ByteBufferWriter* buf) const { |
| buf->WriteUInt64(bits_); |
| return true; |
| } |
| |
| StunByteStringAttribute::StunByteStringAttribute(uint16_t type) |
| : StunAttribute(type, 0), bytes_(NULL) { |
| } |
| |
| StunByteStringAttribute::StunByteStringAttribute(uint16_t type, |
| const std::string& str) |
| : StunAttribute(type, 0), bytes_(NULL) { |
| CopyBytes(str.c_str(), str.size()); |
| } |
| |
| StunByteStringAttribute::StunByteStringAttribute(uint16_t type, |
| const void* bytes, |
| size_t length) |
| : StunAttribute(type, 0), bytes_(NULL) { |
| CopyBytes(bytes, length); |
| } |
| |
| StunByteStringAttribute::StunByteStringAttribute(uint16_t type, uint16_t length) |
| : StunAttribute(type, length), bytes_(NULL) { |
| } |
| |
| StunByteStringAttribute::~StunByteStringAttribute() { |
| delete [] bytes_; |
| } |
| |
| void StunByteStringAttribute::CopyBytes(const char* bytes) { |
| CopyBytes(bytes, strlen(bytes)); |
| } |
| |
| void StunByteStringAttribute::CopyBytes(const void* bytes, size_t length) { |
| char* new_bytes = new char[length]; |
| memcpy(new_bytes, bytes, length); |
| SetBytes(new_bytes, length); |
| } |
| |
| uint8_t StunByteStringAttribute::GetByte(size_t index) const { |
| ASSERT(bytes_ != NULL); |
| ASSERT(index < length()); |
| return static_cast<uint8_t>(bytes_[index]); |
| } |
| |
| void StunByteStringAttribute::SetByte(size_t index, uint8_t value) { |
| ASSERT(bytes_ != NULL); |
| ASSERT(index < length()); |
| bytes_[index] = value; |
| } |
| |
| bool StunByteStringAttribute::Read(ByteBufferReader* buf) { |
| bytes_ = new char[length()]; |
| if (!buf->ReadBytes(bytes_, length())) { |
| return false; |
| } |
| |
| ConsumePadding(buf); |
| return true; |
| } |
| |
| bool StunByteStringAttribute::Write(ByteBufferWriter* buf) const { |
| buf->WriteBytes(bytes_, length()); |
| WritePadding(buf); |
| return true; |
| } |
| |
| void StunByteStringAttribute::SetBytes(char* bytes, size_t length) { |
| delete [] bytes_; |
| bytes_ = bytes; |
| SetLength(static_cast<uint16_t>(length)); |
| } |
| |
| StunErrorCodeAttribute::StunErrorCodeAttribute(uint16_t type, |
| int code, |
| const std::string& reason) |
| : StunAttribute(type, 0) { |
| SetCode(code); |
| SetReason(reason); |
| } |
| |
| StunErrorCodeAttribute::StunErrorCodeAttribute(uint16_t type, uint16_t length) |
| : StunAttribute(type, length), class_(0), number_(0) { |
| } |
| |
| StunErrorCodeAttribute::~StunErrorCodeAttribute() { |
| } |
| |
| int StunErrorCodeAttribute::code() const { |
| return class_ * 100 + number_; |
| } |
| |
| void StunErrorCodeAttribute::SetCode(int code) { |
| class_ = static_cast<uint8_t>(code / 100); |
| number_ = static_cast<uint8_t>(code % 100); |
| } |
| |
| void StunErrorCodeAttribute::SetReason(const std::string& reason) { |
| SetLength(MIN_SIZE + static_cast<uint16_t>(reason.size())); |
| reason_ = reason; |
| } |
| |
| bool StunErrorCodeAttribute::Read(ByteBufferReader* buf) { |
| uint32_t val; |
| if (length() < MIN_SIZE || !buf->ReadUInt32(&val)) |
| return false; |
| |
| if ((val >> 11) != 0) |
| LOG(LS_ERROR) << "error-code bits not zero"; |
| |
| class_ = ((val >> 8) & 0x7); |
| number_ = (val & 0xff); |
| |
| if (!buf->ReadString(&reason_, length() - 4)) |
| return false; |
| |
| ConsumePadding(buf); |
| return true; |
| } |
| |
| bool StunErrorCodeAttribute::Write(ByteBufferWriter* buf) const { |
| buf->WriteUInt32(class_ << 8 | number_); |
| buf->WriteString(reason_); |
| WritePadding(buf); |
| return true; |
| } |
| |
| StunUInt16ListAttribute::StunUInt16ListAttribute(uint16_t type, uint16_t length) |
| : StunAttribute(type, length) { |
| attr_types_ = new std::vector<uint16_t>(); |
| } |
| |
| StunUInt16ListAttribute::~StunUInt16ListAttribute() { |
| delete attr_types_; |
| } |
| |
| size_t StunUInt16ListAttribute::Size() const { |
| return attr_types_->size(); |
| } |
| |
| uint16_t StunUInt16ListAttribute::GetType(int index) const { |
| return (*attr_types_)[index]; |
| } |
| |
| void StunUInt16ListAttribute::SetType(int index, uint16_t value) { |
| (*attr_types_)[index] = value; |
| } |
| |
| void StunUInt16ListAttribute::AddType(uint16_t value) { |
| attr_types_->push_back(value); |
| SetLength(static_cast<uint16_t>(attr_types_->size() * 2)); |
| } |
| |
| bool StunUInt16ListAttribute::Read(ByteBufferReader* buf) { |
| if (length() % 2) |
| return false; |
| |
| for (size_t i = 0; i < length() / 2; i++) { |
| uint16_t attr; |
| if (!buf->ReadUInt16(&attr)) |
| return false; |
| attr_types_->push_back(attr); |
| } |
| // Padding of these attributes is done in RFC 5389 style. This is |
| // slightly different from RFC3489, but it shouldn't be important. |
| // RFC3489 pads out to a 32 bit boundary by duplicating one of the |
| // entries in the list (not necessarily the last one - it's unspecified). |
| // RFC5389 pads on the end, and the bytes are always ignored. |
| ConsumePadding(buf); |
| return true; |
| } |
| |
| bool StunUInt16ListAttribute::Write(ByteBufferWriter* buf) const { |
| for (size_t i = 0; i < attr_types_->size(); ++i) { |
| buf->WriteUInt16((*attr_types_)[i]); |
| } |
| WritePadding(buf); |
| return true; |
| } |
| |
| int GetStunSuccessResponseType(int req_type) { |
| return IsStunRequestType(req_type) ? (req_type | 0x100) : -1; |
| } |
| |
| int GetStunErrorResponseType(int req_type) { |
| return IsStunRequestType(req_type) ? (req_type | 0x110) : -1; |
| } |
| |
| bool IsStunRequestType(int msg_type) { |
| return ((msg_type & kStunTypeMask) == 0x000); |
| } |
| |
| bool IsStunIndicationType(int msg_type) { |
| return ((msg_type & kStunTypeMask) == 0x010); |
| } |
| |
| bool IsStunSuccessResponseType(int msg_type) { |
| return ((msg_type & kStunTypeMask) == 0x100); |
| } |
| |
| bool IsStunErrorResponseType(int msg_type) { |
| return ((msg_type & kStunTypeMask) == 0x110); |
| } |
| |
| bool ComputeStunCredentialHash(const std::string& username, |
| const std::string& realm, |
| const std::string& password, |
| std::string* hash) { |
| // http://tools.ietf.org/html/rfc5389#section-15.4 |
| // long-term credentials will be calculated using the key and key is |
| // key = MD5(username ":" realm ":" SASLprep(password)) |
| std::string input = username; |
| input += ':'; |
| input += realm; |
| input += ':'; |
| input += password; |
| |
| char digest[rtc::MessageDigest::kMaxSize]; |
| size_t size = rtc::ComputeDigest( |
| rtc::DIGEST_MD5, input.c_str(), input.size(), |
| digest, sizeof(digest)); |
| if (size == 0) { |
| return false; |
| } |
| |
| *hash = std::string(digest, size); |
| return true; |
| } |
| |
| } // namespace cricket |