Class RemoteIpValve
- java.lang.Object
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- org.apache.catalina.util.LifecycleBase
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- org.apache.catalina.util.LifecycleMBeanBase
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- org.apache.catalina.valves.ValveBase
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- org.apache.catalina.valves.RemoteIpValve
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- All Implemented Interfaces:
javax.management.MBeanRegistration,Contained,JmxEnabled,Lifecycle,Valve
public class RemoteIpValve extends ValveBase
Tomcat port of mod_remoteip, this valve replaces the apparent client remote IP address and hostname for the request with the IP address list presented by a proxy or a load balancer via a request headers (e.g. "X-Forwarded-For").
Another feature of this valve is to replace the apparent scheme (http/https) and server port with the scheme presented by a proxy or a load balancer via a request header (e.g. "X-Forwarded-Proto").
This valve proceeds as follows:
If the incoming
request.getRemoteAddr()matches the valve's list of internal or trusted proxies:- Loop on the comma delimited list of IPs and hostnames passed by the preceding load balancer or proxy in the given request's Http
header named
$remoteIpHeader(default valuex-forwarded-for). Values are processed in right-to-left order. - For each ip/host of the list:
- if it matches the internal proxies list, the ip/host is swallowed
- if it matches the trusted proxies list, the ip/host is added to the created proxies header
- otherwise, the ip/host is declared to be the remote ip and looping is stopped.
- If the request http header named
$protocolHeader(default valueX-Forwarded-Proto) consists only of forwards that matchprotocolHeaderHttpsValueconfiguration parameter (defaulthttps) thenrequest.isSecure = true,request.scheme = httpsandrequest.serverPort = 443. Note that 443 can be overwritten with the$httpsServerPortconfiguration parameter. - Mark the request with the attribute
Globals.REQUEST_FORWARDED_ATTRIBUTEand valueBoolean.TRUEto indicate that this request has been forwarded by one or more proxies.
Configuration parameters RemoteIpValve property Description Equivalent mod_remoteip directive Format Default Value remoteIpHeader Name of the Http Header read by this valve that holds the list of traversed IP addresses starting from the requesting client RemoteIPHeader Compliant http header name x-forwarded-for internalProxies Regular expression that matches the IP addresses of internal proxies. If they appear in the remoteIpHeadervalue, they will be trusted and will not appear in theproxiesHeadervalueRemoteIPInternalProxy Regular expression (in the syntax supported by java.util.regex)10\.\d{1,3}\.\d{1,3}\.\d{1,3}|192\.168\.\d{1,3}\.\d{1,3}| 169\.254\.\d{1,3}\.\d{1,3}|127\.\d{1,3}\.\d{1,3}\.\d{1,3}| 172\.1[6-9]{1}\.\d{1,3}\.\d{1,3}|172\.2[0-9]{1}\.\d{1,3}\.\d{1,3}| 172\.3[0-1]{1}\.\d{1,3}\.\d{1,3}| 0:0:0:0:0:0:0:1|::1
By default, 10/8, 192.168/16, 169.254/16, 127/8, 172.16/12, and ::1 are allowed.proxiesHeader Name of the http header created by this valve to hold the list of proxies that have been processed in the incoming remoteIpHeaderproxiesHeader Compliant http header name x-forwarded-by trustedProxies Regular expression that matches the IP addresses of trusted proxies. If they appear in the remoteIpHeadervalue, they will be trusted and will appear in theproxiesHeadervalueRemoteIPTrustedProxy Regular expression (in the syntax supported by java.util.regex)protocolHeader Name of the http header read by this valve that holds the flag that this request N/A Compliant http header name like X-Forwarded-Proto,X-Forwarded-SslorFront-End-HttpsX-Forwarded-ProtoprotocolHeaderHttpsValue Value of the protocolHeaderto indicate that it is an Https requestN/A String like httpsorONhttpshttpServerPort Value returned by ServletRequest.getServerPort()when theprotocolHeaderindicateshttpprotocolN/A integer 80 httpsServerPort Value returned by ServletRequest.getServerPort()when theprotocolHeaderindicateshttpsprotocolN/A integer 443 This Valve may be attached to any Container, depending on the granularity of the filtering you wish to perform.
Regular expression vs. IP address blocks:
mod_remoteipallows to use address blocks (e.g.192.168/16) to configureRemoteIPInternalProxyandRemoteIPTrustedProxy; as Tomcat doesn't have a library similar to apr_ipsubnet_test,RemoteIpValveuses regular expression to configureinternalProxiesandtrustedProxiesin the same fashion asRequestFilterValvedoes.
Sample with internal proxies
RemoteIpValve configuration:
<Valve className="org.apache.catalina.valves.RemoteIpValve" internalProxies="192\.168\.0\.10|192\.168\.0\.11" remoteIpHeader="x-forwarded-for" proxiesHeader="x-forwarded-by" protocolHeader="x-forwarded-proto" />Request Values property Value Before RemoteIpValve Value After RemoteIpValve request.remoteAddr 192.168.0.10 140.211.11.130 request.header['x-forwarded-for'] 140.211.11.130, 192.168.0.10 null request.header['x-forwarded-by'] null null request.header['x-forwarded-proto'] https https request.scheme http https request.secure false true request.serverPort 80 443 Note :
x-forwarded-byheader is null because only internal proxies as been traversed by the request.x-forwarded-byis null because all the proxies are trusted or internal.
Sample with trusted proxies
RemoteIpValve configuration:
<Valve className="org.apache.catalina.valves.RemoteIpValve" internalProxies="192\.168\.0\.10|192\.168\.0\.11" remoteIpHeader="x-forwarded-for" proxiesHeader="x-forwarded-by" trustedProxies="proxy1|proxy2" />Request Values property Value Before RemoteIpValve Value After RemoteIpValve request.remoteAddr 192.168.0.10 140.211.11.130 request.header['x-forwarded-for'] 140.211.11.130, proxy1, proxy2 null request.header['x-forwarded-by'] null proxy1, proxy2 Note :
proxy1andproxy2are both trusted proxies that come inx-forwarded-forheader, they both are migrated inx-forwarded-byheader.x-forwarded-byis null because all the proxies are trusted or internal.
Sample with internal and trusted proxies
RemoteIpValve configuration:
<Valve className="org.apache.catalina.valves.RemoteIpValve" internalProxies="192\.168\.0\.10|192\.168\.0\.11" remoteIpHeader="x-forwarded-for" proxiesHeader="x-forwarded-by" trustedProxies="proxy1|proxy2" />Request Values property Value Before RemoteIpValve Value After RemoteIpValve request.remoteAddr 192.168.0.10 140.211.11.130 request.header['x-forwarded-for'] 140.211.11.130, proxy1, proxy2, 192.168.0.10 null request.header['x-forwarded-by'] null proxy1, proxy2 Note :
proxy1andproxy2are both trusted proxies that come inx-forwarded-forheader, they both are migrated inx-forwarded-byheader. As192.168.0.10is an internal proxy, it does not appear inx-forwarded-by.x-forwarded-byis null because all the proxies are trusted or internal.
Sample with an untrusted proxy
RemoteIpValve configuration:
<Valve className="org.apache.catalina.valves.RemoteIpValve" internalProxies="192\.168\.0\.10|192\.168\.0\.11" remoteIpHeader="x-forwarded-for" proxiesHeader="x-forwarded-by" trustedProxies="proxy1|proxy2" />Request Values property Value Before RemoteIpValve Value After RemoteIpValve request.remoteAddr 192.168.0.10 untrusted-proxy request.header['x-forwarded-for'] 140.211.11.130, untrusted-proxy, proxy1 140.211.11.130 request.header['x-forwarded-by'] null proxy1 Note :
x-forwarded-byholds the trusted proxyproxy1.x-forwarded-byholds140.211.11.130becauseuntrusted-proxyis not trusted and thus, we cannot trust thatuntrusted-proxyis the actual remote ip.request.remoteAddrisuntrusted-proxythat is an IP verified byproxy1.
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Nested Class Summary
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Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle
Lifecycle.SingleUse
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Field Summary
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Fields inherited from class org.apache.catalina.valves.ValveBase
asyncSupported, container, containerLog, next, sm
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Fields inherited from class org.apache.catalina.util.LifecycleMBeanBase
mserver
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Fields inherited from interface org.apache.catalina.Lifecycle
AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT
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Constructor Summary
Constructors Constructor Description RemoteIpValve()Default constructor that ensuresValveBase(boolean)is called withtrue.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description protected static java.lang.String[]commaDelimitedListToStringArray(java.lang.String commaDelimitedStrings)Convert a given comma delimited String into an array of Stringjava.lang.StringgetHostHeader()Obtain the name of the HTTP header used to override the value returned byRequest.getServerName()and (optionally depending on {linkisChangeLocalName()Request.getLocalName().intgetHttpServerPort()intgetHttpsServerPort()java.lang.StringgetInternalProxies()java.lang.StringgetPortHeader()Obtain the name of the HTTP header used to override the value returned byRequest.getServerPort()and (optionally depending on {linkisChangeLocalPort()Request.getLocalPort().java.lang.StringgetProtocolHeader()java.lang.StringgetProtocolHeaderHttpsValue()java.lang.StringgetProxiesHeader()java.lang.StringgetRemoteIpHeader()booleangetRequestAttributesEnabled()java.lang.StringgetTrustedProxies()voidinvoke(Request request, Response response)Perform request processing as required by this Valve.booleanisChangeLocalName()booleanisChangeLocalPort()protected static java.lang.StringlistToCommaDelimitedString(java.util.List<java.lang.String> stringList)Deprecated.Unused.voidsetChangeLocalName(boolean changeLocalName)voidsetChangeLocalPort(boolean changeLocalPort)voidsetHostHeader(java.lang.String hostHeader)Set the name of the HTTP header used to override the value returned byRequest.getServerName()and (optionally depending on {linkisChangeLocalName()Request.getLocalName().voidsetHttpServerPort(int httpServerPort)Server Port value if theprotocolHeaderis notnulland does not indicate HTTPvoidsetHttpsServerPort(int httpsServerPort)Server Port value if theprotocolHeaderindicates HTTPSvoidsetInternalProxies(java.lang.String internalProxies)Regular expression that defines the internal proxies.voidsetPortHeader(java.lang.String portHeader)Set the name of the HTTP header used to override the value returned byRequest.getServerPort()and (optionally depending on {linkisChangeLocalPort()Request.getLocalPort().voidsetProtocolHeader(java.lang.String protocolHeader)Header that holds the incoming protocol, usually namedX-Forwarded-Proto.voidsetProtocolHeaderHttpsValue(java.lang.String protocolHeaderHttpsValue)Case insensitive value of the protocol header to indicate that the incoming http request uses SSL.voidsetProxiesHeader(java.lang.String proxiesHeader)The proxiesHeader directive specifies a header into which mod_remoteip will collect a list of all of the intermediate client IP addresses trusted to resolve the actual remote IP.voidsetRemoteIpHeader(java.lang.String remoteIpHeader)Name of the http header from which the remote ip is extracted.voidsetRequestAttributesEnabled(boolean requestAttributesEnabled)Should this valve set request attributes for IP address, Hostname, protocol and port used for the request?voidsetTrustedProxies(java.lang.String trustedProxies)Regular expression defining proxies that are trusted when they appear in theremoteIpHeaderheader.-
Methods inherited from class org.apache.catalina.valves.ValveBase
backgroundProcess, getContainer, getDomainInternal, getNext, getObjectNameKeyProperties, initInternal, isAsyncSupported, setAsyncSupported, setContainer, setNext, startInternal, stopInternal, toString
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Methods inherited from class org.apache.catalina.util.LifecycleMBeanBase
destroyInternal, getDomain, getObjectName, postDeregister, postRegister, preDeregister, preRegister, register, setDomain, unregister, unregister
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Methods inherited from class org.apache.catalina.util.LifecycleBase
addLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, getThrowOnFailure, init, removeLifecycleListener, setState, setState, setThrowOnFailure, start, stop
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Constructor Detail
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RemoteIpValve
public RemoteIpValve()
Default constructor that ensuresValveBase(boolean)is called withtrue.
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Method Detail
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commaDelimitedListToStringArray
protected static java.lang.String[] commaDelimitedListToStringArray(java.lang.String commaDelimitedStrings)
Convert a given comma delimited String into an array of String- Parameters:
commaDelimitedStrings- The string to convert- Returns:
- array of String (non
null)
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listToCommaDelimitedString
@Deprecated protected static java.lang.String listToCommaDelimitedString(java.util.List<java.lang.String> stringList)
Deprecated.Unused. This will be removed in Tomcat 10.1.x onwards. UseStringUtils.join(java.util.Collection)insteadConvert an array of strings in a comma delimited string- Parameters:
stringList- The string list to convert- Returns:
- The concatenated string
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getHostHeader
public java.lang.String getHostHeader()
Obtain the name of the HTTP header used to override the value returned byRequest.getServerName()and (optionally depending on {linkisChangeLocalName()Request.getLocalName().- Returns:
- The HTTP header name
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setHostHeader
public void setHostHeader(java.lang.String hostHeader)
Set the name of the HTTP header used to override the value returned byRequest.getServerName()and (optionally depending on {linkisChangeLocalName()Request.getLocalName().- Parameters:
hostHeader- The HTTP header name
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isChangeLocalName
public boolean isChangeLocalName()
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setChangeLocalName
public void setChangeLocalName(boolean changeLocalName)
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getHttpServerPort
public int getHttpServerPort()
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getHttpsServerPort
public int getHttpsServerPort()
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getPortHeader
public java.lang.String getPortHeader()
Obtain the name of the HTTP header used to override the value returned byRequest.getServerPort()and (optionally depending on {linkisChangeLocalPort()Request.getLocalPort().- Returns:
- The HTTP header name
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setPortHeader
public void setPortHeader(java.lang.String portHeader)
Set the name of the HTTP header used to override the value returned byRequest.getServerPort()and (optionally depending on {linkisChangeLocalPort()Request.getLocalPort().- Parameters:
portHeader- The HTTP header name
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isChangeLocalPort
public boolean isChangeLocalPort()
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setChangeLocalPort
public void setChangeLocalPort(boolean changeLocalPort)
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getInternalProxies
public java.lang.String getInternalProxies()
- Returns:
- Regular expression that defines the internal proxies
- See Also:
setInternalProxies(String)
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getProtocolHeader
public java.lang.String getProtocolHeader()
- Returns:
- the protocol header (e.g. "X-Forwarded-Proto")
- See Also:
setProtocolHeader(String)
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getProtocolHeaderHttpsValue
public java.lang.String getProtocolHeaderHttpsValue()
- Returns:
- the value of the protocol header for incoming https request (e.g. "https")
- See Also:
setProtocolHeaderHttpsValue(String)
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getProxiesHeader
public java.lang.String getProxiesHeader()
- Returns:
- the proxies header name (e.g. "X-Forwarded-By")
- See Also:
setProxiesHeader(String)
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getRemoteIpHeader
public java.lang.String getRemoteIpHeader()
- Returns:
- the remote IP header name (e.g. "X-Forwarded-For")
- See Also:
setRemoteIpHeader(String)
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getRequestAttributesEnabled
public boolean getRequestAttributesEnabled()
- Returns:
trueif the attributes will be logged, otherwisefalse- See Also:
setRequestAttributesEnabled(boolean)
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getTrustedProxies
public java.lang.String getTrustedProxies()
- Returns:
- Regular expression that defines the trusted proxies
- See Also:
setTrustedProxies(String)
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invoke
public void invoke(Request request, Response response) throws java.io.IOException, ServletException
Perform request processing as required by this Valve.
An individual Valve MAY perform the following actions, in the specified order:
- Examine and/or modify the properties of the specified Request and Response.
- Examine the properties of the specified Request, completely generate the corresponding Response, and return control to the caller.
- Examine the properties of the specified Request and Response, wrap either or both of these objects to supplement their functionality, and pass them on.
- If the corresponding Response was not generated (and control was not
returned, call the next Valve in the pipeline (if there is one) by
executing
getNext().invoke(). - Examine, but not modify, the properties of the resulting Response (which was created by a subsequently invoked Valve or Container).
A Valve MUST NOT do any of the following things:
- Change request properties that have already been used to direct the flow of processing control for this request (for instance, trying to change the virtual host to which a Request should be sent from a pipeline attached to a Host or Context in the standard implementation).
- Create a completed Response AND pass this Request and Response on to the next Valve in the pipeline.
- Consume bytes from the input stream associated with the Request, unless it is completely generating the response, or wrapping the request before passing it on.
- Modify the HTTP headers included with the Response after the
getNext().invoke()method has returned. - Perform any actions on the output stream associated with the
specified Response after the
getNext().invoke()method has returned.
- Parameters:
request- The servlet request to be processedresponse- The servlet response to be created- Throws:
java.io.IOException- if an input/output error occurs, or is thrown by a subsequently invoked Valve, Filter, or ServletServletException- if a servlet error occurs, or is thrown by a subsequently invoked Valve, Filter, or Servlet
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setHttpServerPort
public void setHttpServerPort(int httpServerPort)
Server Port value if the
protocolHeaderis notnulland does not indicate HTTPDefault value : 80
- Parameters:
httpServerPort- The server port
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setHttpsServerPort
public void setHttpsServerPort(int httpsServerPort)
Server Port value if the
protocolHeaderindicates HTTPSDefault value : 443
- Parameters:
httpsServerPort- The server port
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setInternalProxies
public void setInternalProxies(java.lang.String internalProxies)
Regular expression that defines the internal proxies.
Default value : 10\.\d{1,3}\.\d{1,3}\.\d{1,3}|192\.168\.\d{1,3}\.\d{1,3}|169\.254.\d{1,3}.\d{1,3}|127\.\d{1,3}\.\d{1,3}\.\d{1,3}|0:0:0:0:0:0:0:1
- Parameters:
internalProxies- The proxy regular expression
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setProtocolHeader
public void setProtocolHeader(java.lang.String protocolHeader)
Header that holds the incoming protocol, usually named
X-Forwarded-Proto. Ifnull, request.scheme and request.secure will not be modified.Default value :
X-Forwarded-Proto- Parameters:
protocolHeader- The header name
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setProtocolHeaderHttpsValue
public void setProtocolHeaderHttpsValue(java.lang.String protocolHeaderHttpsValue)
Case insensitive value of the protocol header to indicate that the incoming http request uses SSL.
Default value :
https- Parameters:
protocolHeaderHttpsValue- The header name
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setProxiesHeader
public void setProxiesHeader(java.lang.String proxiesHeader)
The proxiesHeader directive specifies a header into which mod_remoteip will collect a list of all of the intermediate client IP addresses trusted to resolve the actual remote IP. Note that intermediate RemoteIPTrustedProxy addresses are recorded in this header, while any intermediate RemoteIPInternalProxy addresses are discarded.
Name of the http header that holds the list of trusted proxies that has been traversed by the http request.
The value of this header can be comma delimited.
Default value :
X-Forwarded-By- Parameters:
proxiesHeader- The header name
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setRemoteIpHeader
public void setRemoteIpHeader(java.lang.String remoteIpHeader)
Name of the http header from which the remote ip is extracted.
The value of this header can be comma delimited.
Default value :
X-Forwarded-For- Parameters:
remoteIpHeader- The header name
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setRequestAttributesEnabled
public void setRequestAttributesEnabled(boolean requestAttributesEnabled)
Should this valve set request attributes for IP address, Hostname, protocol and port used for the request? This are typically used in conjunction with theAccessLogwhich will otherwise log the original values. Default istrue. The attributes set are:- org.apache.catalina.AccessLog.RemoteAddr
- org.apache.catalina.AccessLog.RemoteHost
- org.apache.catalina.AccessLog.Protocol
- org.apache.catalina.AccessLog.ServerPort
- org.apache.tomcat.remoteAddr
- Parameters:
requestAttributesEnabled-truecauses the attributes to be set,falsedisables the setting of the attributes.
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setTrustedProxies
public void setTrustedProxies(java.lang.String trustedProxies)
Regular expression defining proxies that are trusted when they appear in the
remoteIpHeaderheader.Default value : empty list, no external proxy is trusted.
- Parameters:
trustedProxies- The regular expression
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