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v1.0.2

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This commit is contained in:
Graeme Walker 2003-05-17 12:00:00 +00:00
parent 3ce0ea8b14
commit ae6c79ec56
18 changed files with 237 additions and 64 deletions
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7
ChangeLog
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@ -1,6 +1,13 @@
E-MailRelay Change Log
======================
1.0.0 -> 1.0.2
--------------
* Support for trusted IP addresses, allowing certain clients to avoid authentication.
* Address verifier interface extended to include authentication information.
* New public mail relay section added to the user guide.
* Example verifier scripts etc. added to the reference guide.
1.0.0 -> 1.0.1
--------------
* In proxy mode unexpected client-side disconnects and timeouts result in ".bad" files [bug-id 659039].

2
configure vendored
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@ -1453,7 +1453,7 @@ fi
# Define the identity of the package.
PACKAGE=emailrelay
VERSION=1.0.1
VERSION=1.0.2
cat >>confdefs.h <<_ACEOF

2
configure.ac
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@ -21,7 +21,7 @@ dnl
dnl Process this file with autoconf to produce a configure script.
AC_INIT(src/gsmtp/gsmtp.h)
AM_INIT_AUTOMAKE(emailrelay,1.0.1)
AM_INIT_AUTOMAKE(emailrelay,1.0.2)
AM_CONFIG_HEADER(config.h)
dnl ===

54
doc/reference.txt
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@ -201,8 +201,11 @@ verifier program, using the "--verifier" command-line switch.
The verifier program is passed a command-line containing the full address, the
user-name part of the address, the host-name part, the local host's fully
qualified domain name, and the current "MAIL" command's "FROM:" address or the
empty string for the "VRFY" command.
qualified domain name, the current "MAIL" command's "FROM:" address or the
empty string for the "VRFY" command, the IP address of the client connection,
the authentication mechanism used by the client ("NONE" if trusted), and either
the authentication name or the fourth field from authentication secrets file if
a trusted IP address.
For valid local mailbox addresses the verifier is expected to write two lines to
the standard output -- the full name associated with the mailbox, and the
@ -215,6 +218,40 @@ written to the standard output is taken as the failure reason.
(Only the few few thousand characters are read from the verifier's standard
output stream; any more is thrown away.)
In this simple example script all addresses are accepted as long as they contain
an at sign. This has the effect of removing the normal "postmaster" functionality,
which is in any case not very useful when running in proxy mode:
#!/bin/sh
# verifier.sh
# An address verifier script for E-MailRelay.
address="${1}"
user="${2}"
host="${3}"
if test "${address}" != "${user}@${host}" ; then exit 2 ; fi
echo "${address}"
echo "${address}" # again
exit 1 # accept
As another example, the following address verifier script accepts all recipient
addresses by default, but rejects remote addresses if the client has bypassed
authentication by connecting on a trusted IP address:
#!/bin/sh
# verifier.sh
# An address verifier script for E-MailRelay.
host="$3"
local_domain="$4"
auth_mechanism="$7"
if test "${auth_mechanism}" = "NONE" -a "${host}" != "${local_domain}"
then
echo "cannot relay without authentication"
exit 2 # reject the recipient address
fi
echo "${address}"
echo "${address}" # again
exit 1 # accept the recipient address
Administration interface
------------------------
If enabled, the server will provide a network interface for performing
@ -373,17 +410,24 @@ least make sure that the secrets file has tight permissions, and that the
passwords in it are not also used for anything important (such as root access).
On the server side authentication is advertised in the response to the SMTP
"EHLO" command if the "--auth-server" command-line switch is used, but
authentication by the client is optional. If the client does authenticate then
"EHLO" command if the "--auth-server" command-line switch is used, and
authentication by the client is mandatory unless the client's IP address is
configured as a trusted address. If the client does authenticate then
the authenticated user-id is stored with the message and then passed on to a
next-hop server using an "AUTH=userid" parameter on the SMTP "MAIL FROM"
command. If the client chooses not to authenticate then the submitted messages
command. If the client does not to authenticate then the submitted messages
will be forwarded using "AUTH=<>" on the "MAIL FROM" command. Note that any
"AUTH=userid" information on incoming submitted messages is ignored and
discarded: it is the authorised userid from the AUTH command which is
propagated, not the userid from the incoming "MAIL FROM" command's "AUTH="
parameter.
Trusted IP addresses are configured with lines in the secrets file having "NONE"
in the first field, "server" in the second field, a wildcarded IP address in
the third field, and an arbitrary keyword in the fourth field. The keyword
is passed to any external address verifier program specified by the "--verifier"
command-line switch.
On the client side authentication is performed when the client has connected to
a server which supports the AUTH extension with the LOGIN or CRAM-MD5 mechanism.
If client authentication is enabled (with the "--auth-client" switch) but the

20
doc/userguide.txt
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@ -297,6 +297,26 @@ from cygwin/bash on Win98 keeps stderr open (albeit with dreadful performance),
whereas the standard command prompt does not. If necessary the environment
variable "GLOGOUTPUT_FILE" can be defined as the name of a log file.
Preventing public mail relay
----------------------------
If you are running E-MailRelay as a server with a permanent connection to the
Internet it is important to prevent public mail relay. By default public mail
relaying is not possible because E-MailRelay does not accept IP connections from
remote clients. However, if the "--remote-clients" switch is used then you need
to be more careful. One option is to require all clients to authenticate, by
using the "--server-auth" switch. But if you need local clients, such as your
own e-mail front-end, to connect without authentication then you will need to
put those trusted IP addresses in the secrets file with an authentication
mechanism of "NONE". Refer to the reference guide for more information.
Taking it one stage further, you may want to allow clients to connect from any
IP address without authentication, but only allow them to send mail to local
users. You can do this by requiring authentication with the "--server-auth"
switch but then exempting all clients from authentication with a "NONE server *.*.*.* x"
line in the secrets file. To complete the solution you must have an address
verifier script ("--verifier") which rejects remote addresses if the client has
not authenticated. Again, refer to the reference guide for further details.
Glossary
--------

4
emailrelay.spec
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@ -1,10 +1,10 @@
Summary: Simple e-mail message transfer agent using SMTP
Name: emailrelay
Version: 1.0.1
Version: 1.0.2
Release: 1
Copyright: GPL
Group: System Environment/Daemons
Source: http://emailrelay.sourceforge.net/.../emailrelay-src-1.0.1.tar.gz
Source: http://emailrelay.sourceforge.net/.../emailrelay-src-1.0.2.tar.gz
BuildRoot: /tmp/emailrelay-install
%define prefix /usr

13
src/gsmtp/gsasl.h
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@ -28,6 +28,7 @@
#include "gsmtp.h"
#include "gsecrets.h"
#include "gexception.h"
#include "gaddress.h"
#include "gstrings.h"
#include "gpath.h"
#include <map>
@ -132,6 +133,10 @@ public:
// Initialiser. Returns true if a supported mechanism.
// May be used more than once.
std::string mechanism() const ;
// Returns the mechanism, as passed to the last init()
// call to return true.
bool mustChallenge() const ;
// Returns true if the mechanism must start with
// a non-empty server challenge.
@ -149,12 +154,16 @@ public:
// Precondition: apply() returned empty
std::string id() const ;
// Returns the authenticated identity. Returns the
// empty string if not authenticated.
// Returns the authenticated or trusted identity. Returns the
// empty string if not authenticated and not trusted.
std::string mechanisms( char sep = ' ' ) const ;
// Returns a list of supported mechanisms.
bool trusted( GNet::Address ) ;
// Returns true if a trusted client that
// does not need to authenticate.
private:
SaslServer( const SaslServer & ) ; // not implemented
void operator=( const SaslServer & ) ; // not implemented

75
src/gsmtp/gsasl_native.cpp
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@ -52,9 +52,12 @@ public:
std::string m_challenge ;
bool m_authenticated ;
std::string m_id ;
std::string m_trustee ;
SaslServerImp() ;
void init( const std::string & mechanism ) ;
bool init( const std::string & mechanism ) ;
bool validate( const std::string & secret , const std::string & response ) const ;
bool trusted( GNet::Address ) ;
bool trustedCore( const std::string & , const std::string & ) ;
static std::string clientResponse( const std::string & secret ,
const std::string & challenge , bool & error ) ;
} ;
@ -65,19 +68,31 @@ GSmtp::SaslServerImp::SaslServerImp() :
{
}
void GSmtp::SaslServerImp::init( const std::string & mechanism )
bool GSmtp::SaslServerImp::init( const std::string & mechanism )
{
m_mechanism = mechanism ;
m_authenticated = false ;
m_id = std::string() ;
m_trustee = std::string() ;
m_first = true ;
m_challenge = std::string() ;
m_mechanism = std::string() ;
if( m_mechanism == "CRAM-MD5" )
if( mechanism == "LOGIN" )
{
m_mechanism = mechanism ;
return true ;
}
else if( mechanism == "CRAM-MD5" )
{
m_mechanism = mechanism ;
std::ostringstream ss ;
ss << "<" << ::rand() << "." << G::DateTime::now() << "@" << GNet::Local::fqdn() << ">" ;
m_challenge = ss.str() ;
return true ;
}
else
{
return false ;
}
}
@ -120,6 +135,41 @@ std::string GSmtp::SaslServerImp::clientResponse( const std::string & secret ,
return std::string() ;
}
bool GSmtp::SaslServerImp::trusted( GNet::Address address )
{
std::string ip = address.displayString(false) ;
G_DEBUG( "GSmtp::SaslServerImp::trusted: \"" << ip << "\"" ) ;
G::Str::StringArray part ;
G::Str::splitIntoFields( ip , part , "." ) ;
if( part.size() == 4U )
{
return
trustedCore(ip,ip) ||
trustedCore(ip,part[0]+"."+part[1]+"."+part[2]+".*") ||
trustedCore(ip,part[0]+"."+part[1]+".*.*") ||
trustedCore(ip,part[0]+".*.*.*") ||
trustedCore(ip,"*.*.*.*") ;
}
else
{
return trustedCore( ip , ip ) ;
}
}
bool GSmtp::SaslServerImp::trustedCore( const std::string & full , const std::string & key )
{
G_DEBUG( "GSmtp::SaslServerImp::trustedCore: \"" << full << "\", \"" << key << "\"" ) ;
std::string secret = Sasl::instance().serverSecrets().secret("NONE",key) ;
bool trusted = ! secret.empty() ;
if( trusted )
{
G_LOG( "GSmtp::SaslServer::trusted: trusting \"" << full << "\" "
<< "(matched on NONE/server/" << key << "/" << secret << ")" ) ;
m_trustee = secret ;
}
return trusted ;
}
// ===
std::string GSmtp::SaslServer::mechanisms( char c ) const
@ -151,10 +201,19 @@ bool GSmtp::SaslServer::mustChallenge() const
bool GSmtp::SaslServer::init( const std::string & mechanism )
{
m_imp->init( mechanism ) ;
G_DEBUG( "GSmtp::SaslServer::init: mechanism \"" << mechanism << "\"" ) ;
return m_imp->init( mechanism ) ;
}
G_DEBUG( "GSmtp::SaslServer::init: mechanism \"" << m_imp->m_mechanism << "\"" ) ;
return m_imp->m_mechanism == "LOGIN" || m_imp->m_mechanism == "CRAM-MD5" ;
std::string GSmtp::SaslServer::mechanism() const
{
return m_imp->m_mechanism ;
}
bool GSmtp::SaslServer::trusted( GNet::Address a )
{
G_DEBUG( "GSmtp::SaslServer::trusted: checking \"" << a.displayString(false) << "\"" ) ;
return m_imp->trusted(a) ;
}
std::string GSmtp::SaslServer::initialChallenge() const
@ -210,7 +269,7 @@ bool GSmtp::SaslServer::authenticated() const
std::string GSmtp::SaslServer::id() const
{
return m_imp->m_authenticated ? m_imp->m_id : std::string() ;
return m_imp->m_authenticated ? m_imp->m_id : m_imp->m_trustee ;
}
// ===

23
src/gsmtp/gserverprotocol.cpp
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@ -34,7 +34,7 @@
#include <string>
GSmtp::ServerProtocol::ServerProtocol( Sender & sender , Verifier & verifier , ProtocolMessage & pmessage ,
const std::string & thishost , const std::string & peer_address ) :
const std::string & thishost , GNet::Address peer_address ) :
m_sender(sender) ,
m_pmessage(pmessage) ,
m_verifier(verifier) ,
@ -88,7 +88,7 @@ bool GSmtp::ServerProtocol::apply( const std::string & line )
G_LOG( "GSmtp::ServerProtocol: rx<<: [message content not logged]" ) ;
G_LOG( "GSmtp::ServerProtocol: rx<<: \"" << G::Str::toPrintableAscii(line) << "\"" ) ;
m_fsm.reset( sProcessing ) ;
m_pmessage.process( *this , m_sasl.id() , m_peer_address ) ; // -> processDone() callback
m_pmessage.process( *this , m_sasl.id() , m_peer_address.displayString(false) ) ; // -> processDone() callback
}
else
{
@ -145,7 +145,7 @@ void GSmtp::ServerProtocol::doNoop( const std::string & , bool & )
void GSmtp::ServerProtocol::doVrfy( const std::string & line , bool & )
{
std::string mbox = parseMailbox( line ) ;
Verifier::Status rc = m_verifier.verify( mbox ) ;
Verifier::Status rc = verify( mbox , "" ) ;
bool local = rc.is_local ;
if( local && rc.full_name.length() )
sendVerified( rc.full_name ) ;
@ -155,6 +155,15 @@ void GSmtp::ServerProtocol::doVrfy( const std::string & line , bool & )
sendWillAccept( mbox ) ;
}
GSmtp::Verifier::Status GSmtp::ServerProtocol::verify( const std::string & to , const std::string & from ) const
{
std::string mechanism = m_sasl.active() ? m_sasl.mechanism() : std::string() ;
std::string id = m_sasl.active() ? m_sasl.id() : std::string() ;
if( m_sasl.active() && !m_authenticated )
mechanism = "NONE" ;
return m_verifier.verify( to , from , m_peer_address , mechanism , id ) ;
}
std::string GSmtp::ServerProtocol::parseMailbox( const std::string & line ) const
{
std::string user ;
@ -300,7 +309,7 @@ void GSmtp::ServerProtocol::sendChallenge( const std::string & s )
void GSmtp::ServerProtocol::doMail( const std::string & line , bool & predicate )
{
if( m_sasl.active() && ! m_authenticated )
if( m_sasl.active() && !m_sasl.trusted(m_peer_address) && !m_authenticated )
{
predicate = false ;
sendAuthRequired() ;
@ -321,7 +330,7 @@ void GSmtp::ServerProtocol::doMail( const std::string & line , bool & predicate
void GSmtp::ServerProtocol::doRcpt( const std::string & line , bool & predicate )
{
std::string to = parseTo( line ) ;
bool ok = m_pmessage.addTo( to , m_verifier.verify(to,m_pmessage.from()) ) ;
bool ok = m_pmessage.addTo( to , verify(to,m_pmessage.from()) ) ;
predicate = ok ;
if( ok )
sendRcptReply() ;
@ -337,7 +346,7 @@ void GSmtp::ServerProtocol::doUnknown( const std::string & line , bool & )
void GSmtp::ServerProtocol::doRset( const std::string & , bool & )
{
m_pmessage.clear() ;
m_authenticated = false ; // (not clear in the RFCs)
m_sasl.init("") ; m_authenticated = false ; // (not clear in the RFCs)
sendRsetReply() ;
}
@ -575,7 +584,7 @@ std::string GSmtp::ServerProtocol::receivedLine() const
ss
<< "Received: "
<< "FROM " << m_peer_name << " "
<< "([" << m_peer_address << "]) "
<< "([" << m_peer_address.displayString(false) << "]) "
<< "BY " << m_thishost << " "
<< "WITH ESMTP "
<< "; "

6
src/gsmtp/gserverprotocol.h
View File

@ -27,6 +27,7 @@
#include "gdef.h"
#include "gsmtp.h"
#include "gprotocolmessage.h"
#include "gaddress.h"
#include "gverifier.h"
#include "gsasl.h"
#include "gstatemachine.h"
@ -71,7 +72,7 @@ public:
} ;
ServerProtocol( Sender & sender , Verifier & verifier , ProtocolMessage & pmessage ,
const std::string & thishost , const std::string & peer_address ) ;
const std::string & thishost , GNet::Address peer_address ) ;
// Constructor.
//
// The Verifier interface is used to verify recipient
@ -185,6 +186,7 @@ private:
std::string parsePeerName( const std::string & ) const ;
std::string parse( const std::string & ) const ;
std::string receivedLine() const ;
Verifier::Status verify( const std::string & , const std::string & ) const ;
private:
Sender & m_sender ;
@ -193,7 +195,7 @@ private:
Fsm m_fsm ;
std::string m_thishost ;
std::string m_peer_name ;
std::string m_peer_address ;
GNet::Address m_peer_address ;
bool m_authenticated ;
SaslServer m_sasl ;
} ;

2
src/gsmtp/gsmtpserver.cpp
View File

@ -41,7 +41,7 @@ GSmtp::ServerPeer::ServerPeer( GNet::StreamSocket * socket , GNet::Address peer_
m_buffer( crlf() ) ,
m_verifier( verifier ) ,
m_pmessage( pmessage ) ,
m_protocol( *this, m_verifier, *m_pmessage.get(), thishost(), peer_address.displayString(false) )
m_protocol( *this, m_verifier, *m_pmessage.get(), thishost(), peer_address )
{
G_LOG_S( "GSmtp::ServerPeer: smtp connection from " << peer_address.displayString() ) ;
m_protocol.init( ident ) ;

24
src/gsmtp/gverifier.cpp
View File

@ -38,9 +38,13 @@ GSmtp::Verifier::Verifier( const G::Path & path ) :
{
}
GSmtp::Verifier::Status GSmtp::Verifier::verify( const std::string & address , const std::string & from ) const
GSmtp::Verifier::Status GSmtp::Verifier::verify( const std::string & address ,
const std::string & from , const GNet::Address & ip ,
const std::string & mechanism , const std::string & extra ) const
{
G_DEBUG( "GSmtp::ProtocolMessage::verify: to \"" << address << "\": from \"" << from << "\"" ) ;
G_DEBUG( "GSmtp::ProtocolMessage::verify: to \"" << address << "\": from \"" << from << "\": "
<< "ip \"" << ip.displayString(false) << "\": auth-mechanism \"" << mechanism << "\": "
<< "auth-extra \"" << extra << "\"" ) ;
std::string fqdn = GNet::Local::fqdn() ;
std::string host ;
@ -57,14 +61,14 @@ GSmtp::Verifier::Status GSmtp::Verifier::verify( const std::string & address , c
Status status =
m_path == G::Path() ?
verifyInternal( address , user , host , fqdn , from ) :
verifyExternal( address , user , host , fqdn , from ) ;
verifyInternal( address , user , host , fqdn ) :
verifyExternal( address , user , host , fqdn , from , ip , mechanism , extra ) ;
return status ;
}
GSmtp::Verifier::Status GSmtp::Verifier::verifyInternal( const std::string & address , const std::string & user ,
const std::string & host , const std::string & fqdn , const std::string & ) const
const std::string & host , const std::string & fqdn ) const
{
Status status ;
if( user == "POSTMASTER" && ( host.empty() || host == "LOCALHOST" || host == fqdn ) )
@ -93,7 +97,8 @@ GSmtp::Verifier::Status GSmtp::Verifier::verifyInternal( const std::string & add
}
GSmtp::Verifier::Status GSmtp::Verifier::verifyExternal( const std::string & address , const std::string & user ,
const std::string & host , const std::string & fqdn , const std::string & from ) const
const std::string & host , const std::string & fqdn , const std::string & from ,
const GNet::Address & ip , const std::string & mechanism , const std::string & extra ) const
{
G::Strings args ;
args.push_back( address ) ;
@ -101,7 +106,12 @@ GSmtp::Verifier::Status GSmtp::Verifier::verifyExternal( const std::string & add
args.push_back( host ) ;
args.push_back( fqdn ) ;
args.push_back( from ) ;
G_LOG( "GSmtp::Verifier: executing " << m_path << " " << address << " " << user << " " << host << " " << fqdn << " " << from ) ;
args.push_back( ip.displayString(false) ) ;
args.push_back( mechanism ) ;
args.push_back( extra ) ;
G_LOG( "GSmtp::Verifier: executing " << m_path << " " << address << " " << user << " "
<< host << " " << fqdn << " " << from << " " << ip.displayString(false) << " "
<< "\"" << mechanism << "\" \"" << extra << "\"" ) ;
std::string response ;
int rc = G::Process::spawn( G::Root::nobody() , m_path , args , &response ) ;

52
src/gsmtp/gverifier.h
View File

@ -27,6 +27,7 @@
#include "gdef.h"
#include "gsmtp.h"
#include "gpath.h"
#include "gaddress.h"
#include <string>
namespace GSmtp
@ -55,34 +56,37 @@ public:
explicit Verifier( const G::Path & exe ) ;
// Constructor.
Status verify( const std::string & recipient_address , const std::string & from = std::string() ) const ;
// Checks a recipient address returning
// a structure which indicates whether the
// address is local, what the full name is,
// and the canonical address.
//
// If invalid then 'is_valid' is set false
// and a 'reason' is supplied.
//
// If valid and syntactically local then
// 'is_local' is set true, 'full_name' is
// set to the full description
// and 'address' is set to the
// canonical local address (without an
// at sign).
//
// If valid and syntactically remote, then
// 'is_local' is set false, 'full_name' is
// empty, and 'address' is copied from
// 'recipient_address'.
//
// The 'from' address is passed in for
// RCPT commands, but not VRFY.
Status verify( const std::string & rcpt_to_parameter ,
const std::string & mail_from_parameter , const GNet::Address & client_ip ,
const std::string & auth_mechanism , const std::string & auth_extra ) const ;
// Checks a recipient address returning
// a structure which indicates whether the
// address is local, what the full name is,
// and the canonical address.
//
// If invalid then 'is_valid' is set false
// and a 'reason' is supplied.
//
// If valid and syntactically local then
// 'is_local' is set true, 'full_name' is
// set to the full description
// and 'address' is set to the
// canonical local address (without an
// at sign).
//
// If valid and syntactically remote, then
// 'is_local' is set false, 'full_name' is
// empty, and 'address' is copied from
// 'recipient_address'.
//
// The 'from' address is passed in for
// RCPT commands, but not VRFY.
private:
Status verifyInternal( const std::string & , const std::string & , const std::string & ,
const std::string & , const std::string & ) const ;
const std::string & ) const ;
Status verifyExternal( const std::string & , const std::string & , const std::string & ,
const std::string & , const std::string & , const GNet::Address & ,
const std::string & , const std::string & ) const ;
private:

9
src/main/auth.cfg Normal file
View File

@ -0,0 +1,9 @@
NONE server 192.168.0.* local
NONE server 192.168.*.* local
NONE server 192.168.0.3 local
NONE server *.*.*.* any
LOGIN server john secret
LOGIN server jane password

2
src/main/commandline.cpp
View File

@ -66,7 +66,7 @@ std::string Main::CommandLine::switchSpec()
<< "m!immediate!forwards each message as soon as it is received (requires --forward-to)!0!!3|"
<< "I!interface!listen on a specific interface!1!ip-address!3|"
<< "i!pid-file!records the daemon process-id in the given file!1!pid-file!3|"
<< "Z!verifier!!1!program!3|"
<< "Z!verifier!defines an external program for validating recipient addresses!1!program!3|"
;
return ss.str() ;
}

2
src/main/doxygen.cfg
View File

@ -3,7 +3,7 @@
# General configuration options
#---------------------------------------------------------------------------
PROJECT_NAME = E-MailRelay
PROJECT_NUMBER = 1.0.1
PROJECT_NUMBER = 1.0.2
OUTPUT_DIRECTORY =
OUTPUT_LANGUAGE = English
EXTRACT_ALL = YES

2
src/main/run.cpp
View File

@ -80,7 +80,7 @@ Main::Run * Main::Run::m_this = NULL ;
//static
std::string Main::Run::versionNumber()
{
return "1.0.1" ;
return "1.0.2" ;
}
Main::Run::Run( const G::Arg & arg ) :

2
src/main/submit.cpp
View File

@ -89,7 +89,7 @@ static void process( const G::Path & path , std::istream & stream ,
{
std::string to = *to_p ;
G::Str::trim( to , " \t\r\n" ) ;
GSmtp::Verifier::Status status = verifier.verify( to ) ;
GSmtp::Verifier::Status status = verifier.verify( to , "" , GNet::Address::localhost(0U) , "" , "" ) ;
msg->addTo( status.address , status.is_local ) ;
}