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fix potential DoS vulnerability (through memory exhaustion) by restricting maximum line length

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This commit is contained in:
Guenter Obiltschnig
2017-01-24 13:13:13 +01:00
parent 3577724efd
commit 4392f13b9c
2 changed files with 16 additions and 10 deletions
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18
Net/src/DialogSocket.cpp
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@@ -15,6 +15,7 @@
#include "Poco/Net/DialogSocket.h"
#include "Poco/Exception.h"
#include "Poco/Ascii.h"
#include <cstring>
@@ -149,20 +150,20 @@ void DialogSocket::sendMessage(const std::string& message, const std::string& ar
bool DialogSocket::receiveMessage(std::string& message)
{
message.clear();
return receiveLine(message);
return receiveLine(message, MAX_LINE_LENGTH);
}
int DialogSocket::receiveStatusMessage(std::string& message)
{
message.clear();
int status = receiveStatusLine(message);
int status = receiveStatusLine(message, MAX_LINE_LENGTH);
if (status < 0)
{
while (status <= 0)
{
message += '\n';
status = receiveStatusLine(message);
status = receiveStatusLine(message, MAX_LINE_LENGTH);
}
}
return status;
@@ -236,14 +237,17 @@ void DialogSocket::allocBuffer()
}
bool DialogSocket::receiveLine(std::string& line)
bool DialogSocket::receiveLine(std::string& line, std::size_t lineLengthLimit)
{
// An old wisdom goes: be strict in what you emit
// and generous in what you accept.
int ch = get();
while (ch != EOF_CHAR && ch != '\r' && ch != '\n')
{
line += (char) ch;
if (lineLengthLimit == 0 || line.size() < lineLengthLimit)
line += (char) ch;
else
throw Poco::IOException("Line too long");
ch = get();
}
if (ch == '\r' && peek() == '\n')
@@ -254,7 +258,7 @@ bool DialogSocket::receiveLine(std::string& line)
}
int DialogSocket::receiveStatusLine(std::string& line)
int DialogSocket::receiveStatusLine(std::string& line, std::size_t lineLengthLimit)
{
int status = 0;
int ch = get();
@@ -274,7 +278,7 @@ int DialogSocket::receiveStatusLine(std::string& line)
status = -status;
}
else status = 0;
if (ch != EOF_CHAR) receiveLine(line);
if (ch != EOF_CHAR) receiveLine(line, lineLengthLimit);
return status;
}