/// <summary>
/// Process event viewer XML
/// </summary>
/// <param name="xml">XML</param>
/// <param name="testing">True if testing, false otherwise</param>
public void ProcessEventViewerXml(string xml, bool testing = false)
{
IPBanLog.Write(LogLevel.Information, "Processing xml: {0}", xml);
XmlDocument doc = ParseXml(xml);
ExtractEventViewerXml(doc, out string ipAddress, out string source, out string userName);
if (AddFailedLoginForEventViewerXml(ipAddress, source, userName, doc) && testing)
{
Console.WriteLine("Found {0}, {1}, {2}", ipAddress, source, userName);
}
}
private HashSet <WatchedFile> UpdateWatchedFiles()
{
HashSet <WatchedFile> watchedFilesCopy = new HashSet <WatchedFile>();
try
{
// read in existing files that match the mask in the directory being watched
if (Directory.Exists(directoryToWatch))
{
foreach (string file in Directory.EnumerateFiles(directoryToWatch, fileMask, SearchOption.TopDirectoryOnly))
{
watchedFilesCopy.Add(new WatchedFile(file, new FileInfo(file).Length));
}
}
}
catch
{
// nothing to do here, something failed enumerating the directory files
}
lock (watchedFiles)
{
// remove files that no longer exist
foreach (WatchedFile existing in watchedFiles.ToArray())
{
if (!watchedFilesCopy.Contains(existing))
{
IPBanLog.Debug("Removing parsed log file {0}", existing.FileName);
watchedFiles.Remove(existing);
}
}
// add new files
foreach (WatchedFile newFile in watchedFilesCopy)
{
// add the file, will fail if it already exists
if (watchedFiles.Add(newFile))
{
IPBanLog.Debug("Adding parsed log file {0}", newFile.FileName);
}
}
// make a copy so we can enumerate outside a lock
watchedFilesCopy.Clear();
foreach (WatchedFile file in watchedFiles)
{
watchedFilesCopy.Add(file);
}
}
return(watchedFilesCopy);
}
public Task <bool> AllowIPAddresses(IEnumerable <string> ipAddresses, CancellationToken cancelToken = default)
{
try
{
allowedIPAddresses = UpdateRule(allowRuleName, "ACCEPT", ipAddresses, allowedIPAddresses, "ip", allowRuleMaxCount, false, null, cancelToken, out bool result);
return(Task.FromResult <bool>(result));
}
catch (Exception ex)
{
IPBanLog.Error(ex);
return(Task.FromResult <bool>(false));
}
}
public Task <bool> BlockIPAddresses(IEnumerable <string> ipAddresses, CancellationToken cancelToken = default)
{
try
{
bannedIPAddresses = UpdateRule(blockRuleName, "DROP", ipAddresses, bannedIPAddresses, "ip", blockRuleMaxCount, false, null, cancelToken, out bool result);
return(Task.FromResult(result));
}
catch (Exception ex)
{
IPBanLog.Error(ex);
return(Task.FromResult(false));
}
}
private int RunProcess(string program, bool requireExitCode, string commandLine, params object[] args)
{
commandLine = program + " " + string.Format(commandLine, args);
commandLine = "-c \"" + commandLine.Replace("\"", "\\\"") + "\"";
IPBanLog.Write(LogLevel.Debug, "Running firewall process: /bin/bash {0}", commandLine);
Process p = Process.Start("/bin/bash", commandLine);
p.WaitForExit();
if (requireExitCode && p.ExitCode != 0)
{
IPBanLog.Write(LogLevel.Error, "Process {0} {1} had exit code {2}", program, commandLine, p.ExitCode);
}
return(p.ExitCode);
}
/// <summary>
/// Update - if the text file path exists, all ip addresses from each line will be unbanned
/// </summary>
public void Update()
{
try
{
if (File.Exists(textFilePath))
{
UnbanIPAddresses(File.ReadLines(textFilePath));
File.Delete(textFilePath);
}
}
catch (Exception ex)
{
IPBanLog.Error(ex);
}
}
public void UnblockIPAddresses(IEnumerable <string> ipAddresses)
{
try
{
lock (policy)
{
for (int i = 0; ; i += MaxIpAddressesPerRule)
{
string ruleName = RulePrefix + i.ToString(CultureInfo.InvariantCulture);
try
{
INetFwRule rule = policy.Rules.Item(ruleName);
if (rule == null)
{
// no more rules to check
break;
}
string remoteIPs = rule.RemoteAddresses;
foreach (string ipAddress in ipAddresses)
{
remoteIPs = Regex.Replace(remoteIPs, ipAddress.Replace(".", "\\.") + "\\/[^,]+,?", ",", RegexOptions.IgnoreCase);
remoteIPs = remoteIPs.Replace(",,", ",");
remoteIPs = remoteIPs.Trim().Trim(',');
}
// ensure we don't have a block rule with no ip addresses, this will block the entire world (WTF Microsoft)...
if (string.IsNullOrWhiteSpace(remoteIPs))
{
policy.Rules.Remove(rule.Name);
}
else
{
rule.RemoteAddresses = remoteIPs;
}
}
catch
{
// no more rules to check
break;
}
}
}
}
catch (Exception ex)
{
IPBanLog.Error(ex);
}
}
/// <summary>
/// Process a line, checking for ip addresses
/// </summary>
/// <param name="line">Line to process</param>
/// <returns>True</returns>
protected override bool OnProcessLine(string line)
{
IPBanLog.Debug("Parsing log file line {0}...", line);
IPAddressLogInfo info = IPBanService.GetIPAddressInfoFromRegex(dns, regex, line);
if (info.FoundMatch)
{
info.Source = info.Source ?? Source;
IPBanLog.Debug("Log file found match, ip: {0}, user: {1}, source: {2}, count: {3}", info.IPAddress, info.UserName, info.Source, info.Count);
failedLogin.AddFailedLogin(info);
}
else
{
IPBanLog.Debug("No match for line {0}", line);
}
return(true);
}
public bool BlockIPAddresses(IReadOnlyList <string> ipAddresses)
{
try
{
int i;
for (i = 0; i < ipAddresses.Count; i += maxIpAddressesPerRule)
{
CreateBlockRule(ipAddresses, i, maxIpAddressesPerRule);
}
DeleteRules(i);
return(true);
}
catch (Exception ex)
{
IPBanLog.Error(ex);
return(false);
}
}
public Task <bool> AllowIPAddresses(IEnumerable <string> ipAddresses, CancellationToken cancelToken = default)
{
try
{
List <string> ipAddressesList = new List <string>();
int i = 0;
foreach (string ipAddress in ipAddresses)
{
if (cancelToken.IsCancellationRequested)
{
throw new OperationCanceledException();
}
ipAddressesList.Add(ipAddress);
if (ipAddressesList.Count == MaxIpAddressesPerRule)
{
string remoteIP = CreateRuleStringForIPAddresses(ipAddressesList, i, MaxIpAddressesPerRule);
GetOrCreateRule(allowRulePrefix + i.ToString(CultureInfo.InvariantCulture), remoteIP, NET_FW_ACTION_.NET_FW_ACTION_ALLOW);
i += MaxIpAddressesPerRule;
ipAddressesList.Clear();
}
}
if (cancelToken.IsCancellationRequested)
{
throw new OperationCanceledException();
}
if (ipAddressesList.Count != 0)
{
string remoteIP = CreateRuleStringForIPAddresses(ipAddressesList, i, MaxIpAddressesPerRule);
GetOrCreateRule(allowRulePrefix + i.ToString(CultureInfo.InvariantCulture), remoteIP, NET_FW_ACTION_.NET_FW_ACTION_ALLOW);
i += MaxIpAddressesPerRule;
}
if (cancelToken.IsCancellationRequested)
{
throw new OperationCanceledException();
}
DeleteRules(allowRulePrefix, i);
return(Task.FromResult <bool>(true));
}
catch (Exception ex)
{
IPBanLog.Error(ex);
return(Task.FromResult <bool>(false));
}
}
public Task <bool> BlockIPAddresses(string ruleNamePrefix, IEnumerable <IPAddressRange> ranges, IEnumerable <PortRange> allowedPorts, CancellationToken cancelToken = default)
{
if (string.IsNullOrWhiteSpace(ruleNamePrefix))
{
return(Task.FromResult(false));
}
try
{
string ruleName = RulePrefix + "_" + ruleNamePrefix + "_0";
UpdateRule(ruleName, "DROP", ranges.Select(r => r.ToCidrString()), null, "net", blockRuleRangesMaxCount, true, allowedPorts, cancelToken, out bool result);
return(Task.FromResult(result));
}
catch (Exception ex)
{
IPBanLog.Error(ex);
return(Task.FromResult(false));
}
}
private static void LoadVersionFromWmiApi()
{
try
{
// WMI API sometimes fails to initialize on .NET core on some systems, not sure why...
// fall-back to WMI, maybe future .NET core versions will fix the bug
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT Caption, Version FROM Win32_OperatingSystem"))
{
foreach (var result in searcher.Get())
{
FriendlyName = result["Caption"] as string;
Version = result["Version"] as string;
break;
}
}
}
catch (Exception ex)
{
IPBanLog.Error(ex, "Unable to load os version from wmi api");
}
}
public Task <bool> BlockIPAddresses(IEnumerable <string> ipAddresses, CancellationToken cancelToken = default)
{
try
{
int i = 0;
List <string> ipAddressesList = new List <string>();
foreach (string ipAddress in ipAddresses)
{
if (cancelToken.IsCancellationRequested)
{
throw new OperationCanceledException(cancelToken);
}
ipAddressesList.Add(ipAddress);
if (ipAddressesList.Count == MaxIpAddressesPerRule)
{
CreateBlockRule(ipAddressesList, 0, MaxIpAddressesPerRule, RulePrefix + i.ToStringInvariant());
i += MaxIpAddressesPerRule;
ipAddressesList.Clear();
}
}
if (cancelToken.IsCancellationRequested)
{
throw new OperationCanceledException(cancelToken);
}
if (ipAddressesList.Count != 0)
{
CreateBlockRule(ipAddressesList, 0, MaxIpAddressesPerRule, RulePrefix + i.ToStringInvariant());
i += MaxIpAddressesPerRule;
}
DeleteRules(RulePrefix, i);
return(Task.FromResult(true));
}
catch (Exception ex)
{
IPBanLog.Error(ex);
return(Task.FromResult(false));
}
}
public bool IsIPAddressAllowed(string ipAddress)
{
try
{
lock (policy)
{
string ruleName = RulePrefix + "AllowIPAddresses";
try
{
INetFwRule rule = policy.Rules.Item(ruleName);
return(rule != null && rule.RemoteAddresses.Contains(ipAddress));
}
catch
{
// OK, rule does not exist
}
}
}
catch (Exception ex)
{
IPBanLog.Error(ex);
}
return(false);
}
public bool IsIPAddressBlocked(string ipAddress)
{
try
{
lock (policy)
{
for (int i = 0; ; i += maxIpAddressesPerRule)
{
string ruleName = RulePrefix + i.ToString(CultureInfo.InvariantCulture);
try
{
INetFwRule rule = policy.Rules.Item(ruleName);
if (rule == null)
{
// no more rules to check
break;
}
else if (rule.RemoteAddresses.Contains(ipAddress))
{
return(true);
}
}
catch
{
// no more rules to check
break;
}
}
}
}
catch (Exception ex)
{
IPBanLog.Error(ex);
}
return(false);
}
/// <summary>
/// Get a firewall ip address, clean and normalize
/// </summary>
/// <param name="ipAddress">IP Address</param>
/// <param name="normalizedIP">The normalized ip ready to go in the firewall or null if invalid ip address</param>
/// <returns>True if ip address can go in the firewall, false otherwise</returns>
public static bool TryGetFirewallIPAddress(this string ipAddress, out string normalizedIP)
{
normalizedIP = ipAddress?.Trim();
if (string.IsNullOrWhiteSpace(normalizedIP) ||
normalizedIP == "0.0.0.0" ||
normalizedIP == "127.0.0.1" ||
normalizedIP == "::0" ||
normalizedIP == "::1" ||
!IPAddressRange.TryParse(normalizedIP, out IPAddressRange range))
{
normalizedIP = null;
return(false);
}
try
{
normalizedIP = (range.Begin.Equals(range.End) ? range.Begin.ToString() : range.ToCidrString());
}
catch (Exception ex)
{
IPBanLog.Debug("Failed to normalize ip {0}, it is not a single ip or cidr range: {1}", ipAddress, ex);
return(false);
}
return(true);
}
static IPBanOS()
{
try
{
Version = Environment.OSVersion.VersionString;
Description = RuntimeInformation.OSDescription;
if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
string tempFile = Path.GetTempFileName();
Process.Start("/bin/bash", "-c \"cat /etc/*release* > " + tempFile + "\"").WaitForExit();
string versionText = File.ReadAllText(tempFile);
File.Delete(tempFile);
Name = IPBanOS.Linux;
FriendlyName = ExtractRegex(versionText, "^(Id|Distrib_Id)=(?<value>.*?)$", string.Empty);
if (FriendlyName.Length != 0)
{
string codeName = ExtractRegex(versionText, "^(Name|Distrib_CodeName)=(?<value>.+)$", string.Empty);
if (codeName.Length != 0)
{
FriendlyName += " - " + codeName;
}
Version = ExtractRegex(versionText, "^Version_Id=(?<value>.+)$", Version);
}
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
Name = IPBanOS.Windows;
string tempFile = Path.GetTempFileName();
// .net core WMI has a strange bug where WMI will not initialize on some systems
// since this is the only place where WMI is used, we can just work-around it
// with the wmic executable, which exists (as of 2018) on all supported Windows.
StartProcessAndWait("cmd", "/C wmic path Win32_OperatingSystem get Caption,Version /format:table > \"" + tempFile + "\"");
if (File.Exists(tempFile))
{
string[] lines = File.ReadAllLines(tempFile);
File.Delete(tempFile);
if (lines.Length > 1)
{
int versionIndex = lines[0].IndexOf("Version");
if (versionIndex >= 0)
{
FriendlyName = lines[1].Substring(0, versionIndex - 1).Trim();
Version = lines[1].Substring(versionIndex).Trim();
}
}
}
else
{
// fall-back to WMI, maybe future .NET core versions will fix the bug
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT Caption, Version FROM Win32_OperatingSystem"))
{
foreach (var result in searcher.Get())
{
FriendlyName = result["Caption"] as string;
Version = result["Version"] as string;
break;
}
}
}
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
// TODO: Implement better for MAC
Name = IPBanOS.Mac;
FriendlyName = "OSX";
}
else
{
Name = IPBanOS.Unknown;
FriendlyName = "Unknown";
}
}
catch (Exception ex)
{
IPBanLog.Error(ex);
}
}
private void ExtractEventViewerXml(XmlDocument doc, out string ipAddress, out string source, out string userName)
{
XmlNode keywordsNode = doc.SelectSingleNode("//Keywords");
string keywordsText = keywordsNode.InnerText;
if (keywordsText.StartsWith("0x"))
{
keywordsText = keywordsText.Substring(2);
}
ulong keywordsULONG = ulong.Parse(keywordsText, NumberStyles.AllowHexSpecifier, CultureInfo.InvariantCulture);
ipAddress = source = userName = null;
if (keywordsNode != null)
{
// we must match on keywords
foreach (ExpressionsToBlockGroup group in service.Config.WindowsEventViewerGetGroupsMatchingKeywords(keywordsULONG))
{
foreach (ExpressionToBlock expression in group.Expressions)
{
// find all the nodes, try and get an ip from any of them, all must match
XmlNodeList nodes = doc.SelectNodes(expression.XPath);
if (nodes.Count == 0)
{
IPBanLog.Write(LogLevel.Information, "No nodes found for xpath {0}", expression.XPath);
ipAddress = null;
break;
}
// if there is a regex, it must match
if (string.IsNullOrWhiteSpace(expression.Regex))
{
// count as a match, do not modify the ip address if it was already set
IPBanLog.Write(LogLevel.Information, "No regex, so counting as a match");
}
else
{
bool foundMatch = false;
// try and find an ip from any of the nodes
foreach (XmlNode node in nodes)
{
// if we get a match, stop checking nodes
if ((foundMatch = IPBanService.GetIPAddressAndUserNameFromRegex(expression.RegexObject, node.InnerText, ref ipAddress, ref userName)))
{
break;
}
}
if (!foundMatch)
{
// match fail, null out ip, we have to match ALL the nodes or we get null ip and do not ban
IPBanLog.Write(LogLevel.Information, "Regex {0} did not match any nodes with xpath {1}", expression.Regex, expression.XPath);
ipAddress = null;
break;
}
}
}
if (ipAddress != null)
{
source = group.Source;
break;
}
ipAddress = source = userName = null; // set null for the next node attempt
}
}
}
private bool GetOrCreateRule(string ruleName, string remoteIPAddresses, NET_FW_ACTION_ action, IEnumerable <PortRange> allowedPorts = null)
{
remoteIPAddresses = (remoteIPAddresses ?? string.Empty).Trim();
bool emptyIPAddressString = string.IsNullOrWhiteSpace(remoteIPAddresses) || remoteIPAddresses == "*";
bool ruleNeedsToBeAdded = false;
lock (policy)
{
recreateRule:
INetFwRule rule = null;
try
{
rule = policy.Rules.Item(ruleName);
}
catch
{
// ignore exception, assume does not exist
}
if (rule == null)
{
rule = Activator.CreateInstance(ruleType) as INetFwRule;
rule.Name = ruleName;
rule.Enabled = true;
rule.Action = action;
rule.Description = "Automatically created by IPBan";
rule.Direction = NET_FW_RULE_DIRECTION_.NET_FW_RULE_DIR_IN;
rule.EdgeTraversal = false;
rule.Grouping = "IPBan";
rule.LocalAddresses = "*";
rule.Profiles = int.MaxValue; // all
ruleNeedsToBeAdded = true;
}
// do not ever set an empty string, Windows treats this as * which means everything
if (!emptyIPAddressString)
{
try
{
PortRange[] allowedPortsArray = (allowedPorts?.ToArray());
if (allowedPortsArray != null && allowedPortsArray.Length != 0)
{
rule.Protocol = (int)NET_FW_IP_PROTOCOL_.NET_FW_IP_PROTOCOL_TCP;
string localPorts;
if (action == NET_FW_ACTION_.NET_FW_ACTION_BLOCK)
{
localPorts = IPBanFirewallUtility.GetPortRangeStringBlockExcept(allowedPortsArray);
}
else
{
localPorts = IPBanFirewallUtility.GetPortRangeStringAllow(allowedPortsArray);
}
rule.LocalPorts = localPorts;
}
else
{
try
{
rule.Protocol = (int)NET_FW_IP_PROTOCOL_.NET_FW_IP_PROTOCOL_ANY;
}
catch
{
// failed to set protocol to any, we are switching from tcp back to any without ports, the only option is to
// recreate the rule
if (!ruleNeedsToBeAdded)
{
policy.Rules.Remove(ruleName);
goto recreateRule;
}
}
}
rule.RemoteAddresses = remoteIPAddresses;
}
catch (Exception ex)
{
// if something failed, do not create the rule
emptyIPAddressString = true;
IPBanLog.Error(ex);
}
}
if (emptyIPAddressString || string.IsNullOrWhiteSpace(rule.RemoteAddresses) || rule.RemoteAddresses == "*")
{
// if no ip addresses, remove the rule as it will allow or block everything with an empty RemoteAddresses string
try
{
rule = null;
policy.Rules.Remove(ruleName);
}
catch
{
}
}
else if (ruleNeedsToBeAdded)
{
policy.Rules.Add(rule);
}
return(rule != null);
}
}
private IPBanConfig(string xml, IDnsLookup dns)
{
this.dns = dns;
// deserialize with XmlDocument, the .net core Configuration class is quite buggy
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
foreach (XmlNode node in doc.SelectNodes("//appSettings/add"))
{
appSettings[node.Attributes["key"].Value] = node.Attributes["value"].Value;
}
GetConfig <int>("FailedLoginAttemptsBeforeBan", ref failedLoginAttemptsBeforeBan);
GetConfig <TimeSpan>("BanTime", ref banTime);
GetConfig <bool>("ClearBannedIPAddressesOnRestart", ref clearBannedIPAddressesOnRestart);
GetConfig <TimeSpan>("ExpireTime", ref expireTime);
GetConfig <TimeSpan>("CycleTime", ref cycleTime);
GetConfig <TimeSpan>("MinimumTimeBetweenFailedLoginAttempts", ref minimumTimeBetweenFailedLoginAttempts);
GetConfig <string>("FirewallRulePrefix", ref firewallRulePrefix);
GetConfig <bool>("CreateWhitelistFirewallRule", ref createWhitelistFirewallRule);
string whiteListString = GetConfig <string>("Whitelist", string.Empty);
string whiteListRegexString = GetConfig <string>("WhitelistRegex", string.Empty);
string blacklistString = GetConfig <string>("Blacklist", string.Empty);
string blacklistRegexString = GetConfig <string>("BlacklistRegex", string.Empty);
PopulateList(whiteList, ref whiteListRegex, whiteListString, whiteListRegexString);
PopulateList(blackList, ref blackListRegex, blacklistString, blacklistRegexString);
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
expressions = new XmlSerializer(typeof(ExpressionsToBlock)).Deserialize(new XmlNodeReader(doc.SelectSingleNode("//ExpressionsToBlock"))) as ExpressionsToBlock;
if (expressions != null)
{
foreach (ExpressionsToBlockGroup group in expressions.Groups)
{
foreach (ExpressionToBlock expression in group.Expressions)
{
expression.Regex = (expression.Regex ?? string.Empty).Trim();
}
}
}
}
else
{
expressions = new ExpressionsToBlock {
Groups = new ExpressionsToBlockGroup[0]
};
}
try
{
LogFilesToParse logFilesToParse = new XmlSerializer(typeof(LogFilesToParse)).Deserialize(new XmlNodeReader(doc.SelectSingleNode("//LogFilesToParse"))) as LogFilesToParse;
logFiles = (logFilesToParse == null ? new LogFileToParse[0] : logFilesToParse.LogFiles);
}
catch (Exception ex)
{
IPBanLog.Error(ex);
logFiles = new LogFileToParse[0];
}
GetConfig <string>("ProcessToRunOnBan", ref processToRunOnBan);
// retrieve firewall configuration
string[] firewallTypes = GetConfig <string>("FirewallType", string.Empty).Split(',', StringSplitOptions.RemoveEmptyEntries);
foreach (string firewallOSAndType in firewallTypes)
{
string[] pieces = firewallOSAndType.Split(':');
if (pieces.Length == 2)
{
osAndFirewallType[pieces[0]] = pieces[1];
}
}
string userNameWhiteListString = GetConfig <string>("UserNameWhiteList", string.Empty);
foreach (string userName in userNameWhiteListString.Split(','))
{
string userNameTrimmed = userName.Normalize().Trim();
if (userNameTrimmed.Length > 0)
{
userNameWhitelist.Add(userNameTrimmed);
}
}
GetConfig <int>("UserNameWhiteListMinimumEditDistance", ref userNameWhitelistMaximumEditDistance);
GetConfig <int>("FailedLoginAttemptsBeforeBanUserNameWhitelist", ref failedLoginAttemptsBeforeBanUserNameWhitelist);
GetConfig <string>("GetUrlUpdate", ref getUrlUpdate);
GetConfig <string>("GetUrlStart", ref getUrlStart);
GetConfig <string>("GetUrlStop", ref getUrlStop);
GetConfig <string>("GetUrlConfig", ref getUrlConfig);
GetConfig <string>("ExternalIPAddressUrl", ref externalIPAddressUrl);
}
/// <summary>
/// Log current log levels
/// </summary>
public static void WriteLogLevels(IPBan.LogLevel level = LogLevel.Warn)
{
IPBanLog.Write(level, "Log levels: {0},{1},{2},{3},{4},{5}", logger.IsFatalEnabled, logger.IsErrorEnabled, logger.IsWarnEnabled, logger.IsInfoEnabled, logger.IsDebugEnabled, logger.IsTraceEnabled);
}
private IPAddressLogInfo ExtractEventViewerXml(XmlDocument doc)
{
XmlNode keywordsNode = doc.SelectSingleNode("//Keywords");
string keywordsText = keywordsNode.InnerText;
if (keywordsText.StartsWith("0x"))
{
keywordsText = keywordsText.Substring(2);
}
ulong keywordsULONG = ulong.Parse(keywordsText, NumberStyles.AllowHexSpecifier, CultureInfo.InvariantCulture);
IPAddressLogInfo info = null;
if (keywordsNode != null)
{
// we must match on keywords
foreach (ExpressionsToBlockGroup group in service.Config.WindowsEventViewerGetGroupsMatchingKeywords(keywordsULONG))
{
foreach (ExpressionToBlock expression in group.Expressions)
{
// find all the nodes, try and get an ip from any of them, all must match
XmlNodeList nodes = doc.SelectNodes(expression.XPath);
if (nodes.Count == 0)
{
IPBanLog.Info("No nodes found for xpath {0}", expression.XPath);
info = null;
break;
}
// if there is a regex, it must match
if (string.IsNullOrWhiteSpace(expression.Regex))
{
// count as a match, do not modify the ip address if it was already set
IPBanLog.Info("No regex, so counting as a match");
}
else
{
info = null;
// try and find an ip from any of the nodes
foreach (XmlNode node in nodes)
{
// if we get a match, stop checking nodes
info = IPBanService.GetIPAddressInfoFromRegex(service.DnsLookup, expression.RegexObject, node.InnerText);
if (info.FoundMatch)
{
break;
}
}
if (info != null && !info.FoundMatch)
{
// match fail, null out ip, we have to match ALL the nodes or we get null ip and do not ban
IPBanLog.Info("Regex {0} did not match any nodes with xpath {1}", expression.Regex, expression.XPath);
info = null;
break;
}
}
}
if (info != null && info.FoundMatch && info.IPAddress != null)
{
info.Source = info.Source ?? group.Source;
break;
}
info = null; // set null for next attempt
}
}
return(info);
}
static IPBanOS()
{
try
{
// start off with built in version info, this is not as detailed or nice as we like,
// so we try some other ways to get more detailed information
Version = Environment.OSVersion.VersionString;
Description = RuntimeInformation.OSDescription;
// attempt to get detailed version info
if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
string tempFile = Path.GetTempFileName();
Process.Start("/bin/bash", "-c \"cat /etc/*release* > " + tempFile + "\"").WaitForExit();
System.Threading.Tasks.Task.Delay(100); // wait a small bit for file to really be closed
string versionText = File.ReadAllText(tempFile).Trim();
File.Delete(tempFile);
if (string.IsNullOrWhiteSpace(versionText))
{
IPBanLog.Error(new IOException("Unable to load os version from /etc/*release* ..."));
}
else
{
Name = IPBanOS.Linux;
FriendlyName = ExtractRegex(versionText, "^(Id|Distrib_Id)=(?<value>.*?)$", string.Empty);
if (FriendlyName.Length != 0)
{
string codeName = ExtractRegex(versionText, "^(Name|Distrib_CodeName)=(?<value>.+)$", string.Empty);
if (codeName.Length != 0)
{
FriendlyName += " - " + codeName;
}
Version = ExtractRegex(versionText, "^Version_Id=(?<value>.+)$", Version);
}
}
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
Name = IPBanOS.Windows;
string tempFile = Path.GetTempFileName();
// .net core WMI has a strange bug where WMI will not initialize on some systems
// since this is the only place where WMI is used, we can just work-around it
// with the wmic executable, which exists (as of 2018) on all supported Windows.
StartProcessAndWait("cmd", "/C wmic path Win32_OperatingSystem get Caption,Version /format:table > \"" + tempFile + "\"");
if (File.Exists(tempFile))
{
// try up to 10 times to read the file
for (int i = 0; i < 10; i++)
{
try
{
string[] lines = File.ReadAllLines(tempFile);
File.Delete(tempFile);
if (lines.Length > 1)
{
int versionIndex = lines[0].IndexOf("Version");
if (versionIndex >= 0)
{
FriendlyName = lines[1].Substring(0, versionIndex - 1).Trim();
Version = lines[1].Substring(versionIndex).Trim();
break;
}
}
throw new IOException("Invalid file generated from wmic");
}
catch (Exception ex)
{
if (i < 9)
{
System.Threading.Tasks.Task.Delay(200).Wait();
}
else
{
IPBanLog.Error(ex, "Unable to load os version using wmic, trying wmi api...");
// last resort, try wmi api
LoadVersionFromWmiApi();
}
}
}
}
else
{
// last resort, try wmi api
LoadVersionFromWmiApi();
}
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
// TODO: Implement better for MAC
Name = IPBanOS.Mac;
FriendlyName = "OSX";
}
else
{
Name = IPBanOS.Unknown;
FriendlyName = "Unknown";
}
}
catch (Exception ex)
{
IPBanLog.Error(ex);
}
}
private bool PingFile(WatchedFile file, FileStream fs)
{
const int maxCountBeforeNewline = 1024;
int b;
long lastNewlinePos = -1;
byte[] bytes;
long end = Math.Min(file.LastLength, fs.Length);
int countBeforeNewline = 0;
fs.Position = file.LastPosition;
while (fs.Position < end && countBeforeNewline++ != maxCountBeforeNewline)
{
// read until last \n is found
b = fs.ReadByte();
if (b == '\n')
{
lastNewlinePos = fs.Position - 1;
countBeforeNewline = 0;
}
}
if (countBeforeNewline == maxCountBeforeNewline)
{
throw new InvalidOperationException("Log file " + this.fileMask + " may not be a plain text new line delimited file");
}
if (lastNewlinePos > -1)
{
// set file position ready for the next read right after the newline
fs.Position = file.LastPosition;
bytes = new BinaryReader(fs).ReadBytes((int)(lastNewlinePos - fs.Position));
// set position for next ping
file.LastPosition = lastNewlinePos + 1;
// read text and run regex to find ip addresses to ban
string subString = Encoding.UTF8.GetString(bytes);
string[] lines = subString.Split('\n');
string ipAddress = null;
string userName = null;
bool foundOne = false;
// find ip and user name from all lines
foreach (string line in lines)
{
IPBanLog.Write(LogLevel.Debug, "Parsing log file line {0}...", line);
bool foundMatch = IPBanService.GetIPAddressAndUserNameFromRegex(Regex, line.Trim(), ref ipAddress, ref userName);
if (foundMatch)
{
IPBanLog.Write(LogLevel.Debug, "Found match, ip: {0}, user: {1}", ipAddress, userName);
service.AddFailedLogin(ipAddress, Source, userName);
foundOne = true;
}
else
{
IPBanLog.Write(LogLevel.Debug, "No match!");
}
}
if (foundOne)
{
// signal that we have found ip addresses
ipEvent.Set();
}
}
return(maxFileSize > 0 && fs.Length > maxFileSize);
}
private void PingFiles()
{
try
{
pingTimer.Enabled = false;
}
catch
{
}
try
{
// re-open files and read one byte to flush disk cache
foreach (WatchedFile file in UpdateWatchedFiles())
{
// if file length has changed, ping the file
bool delete = false;
// ugly hack to force file to flush
using (FileStream fs = new FileStream(file.FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
try
{
fs.Position = fs.Length - 1;
fs.ReadByte();
}
catch
{
}
}
long len = new FileInfo(file.FileName).Length;
// if file has shrunk (deleted and recreated for example) reset positions to 0
if (len < file.LastLength || len < file.LastPosition)
{
file.LastPosition = 0;
}
// use file info for length compare to avoid doing a full file open
if (len != file.LastLength)
{
using (FileStream fs = new FileStream(file.FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
file.LastLength = len;
delete = PingFile(file, fs);
}
}
else
{
IPBanLog.Debug("Watched file {0} length has not changed", file.FileName);
}
if (delete)
{
try
{
File.Delete(file.FileName);
}
catch
{
// OK someone else might have it open, in which case we have no chance to delete
}
}
}
}
catch (Exception ex)
{
IPBanLog.Error(ex);
}
try
{
pingTimer.Enabled = true;
}
catch
{
}
}
private bool PingFile(WatchedFile file, FileStream fs)
{
const int maxCountBeforeNewline = 1024;
int b;
long lastNewlinePos = -1;
byte[] bytes;
long end = Math.Min(file.LastLength, fs.Length);
int countBeforeNewline = 0;
fs.Position = file.LastPosition;
IPBanLog.Info("Processing watched file {0}, len = {1}, pos = {2}", file.FileName, file.LastLength, file.LastPosition);
while (fs.Position < end && countBeforeNewline++ != maxCountBeforeNewline)
{
// read until last \n is found
b = fs.ReadByte();
if (b == '\n')
{
lastNewlinePos = fs.Position - 1;
countBeforeNewline = 0;
}
}
if (countBeforeNewline == maxCountBeforeNewline)
{
throw new InvalidOperationException("Log file " + this.fileMask + " may not be a plain text new line delimited file");
}
if (lastNewlinePos > -1)
{
// set file position ready for the next read right after the newline
fs.Position = file.LastPosition;
bytes = new BinaryReader(fs).ReadBytes((int)(lastNewlinePos - fs.Position));
// set position for next ping
file.LastPosition = lastNewlinePos + 1;
// read text and run regex to find ip addresses to ban
string subString = Encoding.UTF8.GetString(bytes);
string[] lines = subString.Split('\n');
bool foundOne = false;
// find ip and user name from all lines
foreach (string line in lines)
{
string trimmedLine = line.Trim();
IPBanLog.Debug("Parsing log file line {0}...", trimmedLine);
IPAddressLogInfo info = IPBanService.GetIPAddressInfoFromRegex(dns, Regex, trimmedLine);
if (info.FoundMatch)
{
info.Source = info.Source ?? Source;
IPBanLog.Debug("Log file found match, ip: {0}, user: {1}, source: {2}, count: {3}", info.IPAddress, info.UserName, info.Source, info.Count);
failedLogin.AddFailedLogin(info);
foundOne = true;
}
else
{
IPBanLog.Debug("No match for line {0}", line);
}
}
if (foundOne)
{
// signal that we have found ip addresses
ipEvent.Set();
}
}
return(maxFileSize > 0 && fs.Length > maxFileSize);
}