Cutthrough: fix multi-message initiating connections. Bug 2230

[users/heiko/exim.git] / doc / doc-src / FAQ.src

diff --git a/doc/doc-src/FAQ.src b/doc/doc-src/FAQ.src
index b1a1ae7430171adf3a8b661244c6c6c338806a67..1ff867b62fbed819c51a7a56ed1108de0ddb494e 100644 (file)
--- a/doc/doc-src/FAQ.src
+++ b/doc/doc-src/FAQ.src
@@ -1,4 +1,3 @@
-## $Cambridge: exim/doc/doc-src/FAQ.src,v 1.7 2005/05/06 08:28:16 ph10 Exp $

 ##
 ## This file is processed by Perl scripts to produce an ASCII and an HTML
 ## version. Lines starting with ## are omitted. The markup used with paragraphs
 ##
 ## This file is processed by Perl scripts to produce an ASCII and an HTML
 ## version. Lines starting with ## are omitted. The markup used with paragraphs


@@ -467,7 +466,7 @@ A0020: These kinds of delay are usually caused by some kind of network problem
 ==>          deny  hosts = *.x.example
 
            If at all possible, you should use IP addresses instead of host
 ==>          deny  hosts = *.x.example
 
            If at all possible, you should use IP addresses instead of host

-           names in blocking lists in order to to avoid this problem.
+           names in blocking lists in order to avoid this problem.

 
        You can use the \-bh-\ option to get more information about what is
        happening at the start of a connection. However, note that the \-bh-\
 
        You can use the \-bh-\ option to get more information about what is
        happening at the start of a connection. However, note that the \-bh-\


@@ -851,7 +850,9 @@ A0044: Exim has been unable to create a file in its spool area in which to
 
        If you are running Exim with an alternate configuration file using a
        command such as \"exim -C altconfig..."\, remember that the use of -C
 
        If you are running Exim with an alternate configuration file using a
        command such as \"exim -C altconfig..."\, remember that the use of -C

-       takes away Exim's root privilege.
+       takes away Exim's root privilege, unless \\TRUSTED_CONFIG_LIST\\
+       is set in \(Local/Makefile)\ and the corresponding file contains a
+       prefix which matches the alternative configuration file being used.

 
        Check that you have defined the spool directory correctly by running
 
 
        Check that you have defined the spool directory correctly by running
 


@@ -911,7 +912,7 @@ A0047: \-bz-\ is a Sendmail option requesting it to create a `configuration free
 
 ==>      /usr/lib/sendmail -bz
 
 
 ==>      /usr/lib/sendmail -bz
 

-       in some start-up script (e.g. \(/etc/init.d/mail)\) immedately before
+       in some start-up script (e.g. \(/etc/init.d/mail)\) immediately before

 
 ==>      /usr/lib/sendmail -bd -q15m
 
 
 ==>      /usr/lib/sendmail -bd -q15m
 


@@ -1147,25 +1148,17 @@ Q0065: When (as \/root/\) I use -C to run Exim with an alternate configuration
        trying to run an \%autoreply%\ transport. Why is this?
 
 A0065: When Exim is called with -C, it passes on -C to any instances of itself
        trying to run an \%autoreply%\ transport. Why is this?
 
 A0065: When Exim is called with -C, it passes on -C to any instances of itself

-       that it calls (so that the whole sequence uses the same config file). If
-       it's running as \/exim/\ when it does this, all is well. However, if it
-       happens as a consequence of a non-privileged user running \%autoreply%\,
-       the called Exim gives up its root privilege. Then it can't write to the
-       spool.
-
-       This means that you can't use -C (even as \/root/\) to run an instance of
-       Exim that is going to try to run \%autoreply%\ from a process that is
-       neither \/root/\ nor \/exim/\. Because of the architecture of Exim (using
-       re-execs to regain privilege), there isn't any way round this
-       restriction. Therefore, the only way you can make this scenario work is
-       to run the \%autoreply%\ transport as \/exim/\ (that is, the user that
-       owns the Exim spool files). This may be satisfactory for autoreplies
-       that are essentially system-generated, but of course is no good for
-       autoreplies from unprivileged users, where you want the \%autoreply%\
-       transport to be run as the user. To get that to work with an alternate
-       configuration, you'll have to use two Exim binaries, with different
-       configuration file names in each. See S001 for a script that patches
-       the configuration name in an Exim binary.
+       that it calls (so that the whole sequence uses the same config file).
+       However, Exim gives up its root privilege if any user except \/root\/
+       passes a -C option to use a non-default configuration file, and that
+       includes the case where Exim re-execs itself to regain root privilege.
+       Thus it can't write to the spool.
+
+       The fix for this is to use the \\TRUSTED_CONFIG_LIST\\ build-time
+       option. This defines a file containing a list of 'trusted' prefixes for
+       configuration files. Any configuration file specified with -C, if it
+       matches a prefix listed in that file, will be used without dropping root
+       privileges (as long as it is not writeable by a non-root user).

 
 
 Q0066: What does the message \*unable to set gid=xxx or uid=xxx*\ mean?
 
 
 Q0066: What does the message \*unable to set gid=xxx or uid=xxx*\ mean?


@@ -1868,7 +1861,7 @@ A0117: Here! This is a contribution from a RedHat user, somewhat edited. On
 
 ==>      adduser exim
 
 
 ==>      adduser exim
 

-       (3) Now you can prepare to build Exim. Go to \?http://www.exim.org?\ or
+       (3) Now you can prepare to build Exim. Go to \?https://www.exim.org?\ or

        one of its mirrors, or the master ftp site
        \?ftp://ftp.csx.cam.ac.uk/pub/software/email/exim/exim4?\, and download
        \(exim-4.20.tar.gz)\ or whatever the current release is. Then:
        one of its mirrors, or the master ftp site
        \?ftp://ftp.csx.cam.ac.uk/pub/software/email/exim/exim4?\, and download
        \(exim-4.20.tar.gz)\ or whatever the current release is. Then:


@@ -2124,7 +2117,7 @@ A0301: They mean exactly what they say. Exim expected to route an address to a
        with MX records pointing to \"localhost"\ (or other names with A records
        that specify 127.0.0.1), which causes this behaviour. You can use the
        \ignore_target_hosts\ option to get Exim to ignore these records. The
        with MX records pointing to \"localhost"\ (or other names with A records
        that specify 127.0.0.1), which causes this behaviour. You can use the
        \ignore_target_hosts\ option to get Exim to ignore these records. The

-       default contiguration does this. For more discussion, see Q0319. For
+       default configuration does this. For more discussion, see Q0319. For

        other cases:
 
        (1) If the domain is meant to be handled as a local domain, there
        other cases:
 
        (1) If the domain is meant to be handled as a local domain, there


@@ -2323,7 +2316,7 @@ A0310: If a DNS lookup returns no MXs, Exim looks for an address record, in
 
 
 Q0311: When a DNS lookup for MX records fails to complete, why doesn't Exim
 
 
 Q0311: When a DNS lookup for MX records fails to complete, why doesn't Exim

-       send the messsage to the host defined by the A record?
+       send the message to the host defined by the A record?

 
 A0311: The RFCs are quite clear on this. Only if it is known that there are no
        MX records is an MTA allowed to make use of the A record. When an MX
 
 A0311: The RFCs are quite clear on this. Only if it is known that there are no
        MX records is an MTA allowed to make use of the A record. When an MX


@@ -2684,7 +2677,7 @@ A0408: Set the \qualify_preserve_domain\ option on the \%redirect%\ router.
 Q0409: I want mail for any local part at certain virtual domains to go
        to a single address for each domain.
 
 Q0409: I want mail for any local part at certain virtual domains to go
        to a single address for each domain.
 

-A0409: One way to to this is
+A0409: One way to do this is

 
 ==>      virtual:
            driver = redirect
 
 ==>      virtual:
            driver = redirect


@@ -3459,7 +3452,7 @@ A0510: \^elspy^\ is a layer of glue code that enables you to write Python code
        to scan email messages at SMTP time. \^elspy^\ also includes a small
        Python library with common mail-scanning tools, including an interface
        to SpamAssassin and a simple but effective virus detector. You can
        to scan email messages at SMTP time. \^elspy^\ also includes a small
        Python library with common mail-scanning tools, including an interface
        to SpamAssassin and a simple but effective virus detector. You can

-       optain \^elspy^\ from \?http://elspy.sourceforge.net/?\.
+       obtain \^elspy^\ from \?http://elspy.sourceforge.net/?\.

 
 
 Q0511: Whenever my system filter uses a \mail\ command to send a message, I get
 
 
 Q0511: Whenever my system filter uses a \mail\ command to send a message, I get


@@ -3550,7 +3543,7 @@ A0601: Whenever Exim does a local delivery, it runs a process under a specific
 ==>      majordomo: |/local/mail/majordomo ...
 
        then Exim has to be told what uid/gid to use for the delivery. This can
 ==>      majordomo: |/local/mail/majordomo ...
 
        then Exim has to be told what uid/gid to use for the delivery. This can

-       be done either on the routerr that handles the address, or on the
+       be done either on the router that handles the address, or on the

        transport that actually does the delivery. If a pipe is going to run a
        setuid program, then it doesn't matter what uid Exim starts it out with,
        and so the most straightforward thing is to put
        transport that actually does the delivery. If a pipe is going to run a
        setuid program, then it doesn't matter what uid Exim starts it out with,
        and so the most straightforward thing is to put


@@ -3624,7 +3617,7 @@ A0603: Q0601 contains background information on this. If you are using, say, an
 
 
 Q0604: I want to use MMDF-style mailboxes. How can I get Exim to append the
 
 
 Q0604: I want to use MMDF-style mailboxes. How can I get Exim to append the

-       ctrl-A characters that separate indvidual emails?
+       ctrl-A characters that separate individual emails?

 
 A0604: Set the \message_suffix\ option in the \%appendfile%\ transport. In fact,
        for MMDF mailboxes you need a prefix as well as a suffix to get it
 
 A0604: Set the \message_suffix\ option in the \%appendfile%\ transport. In fact,
        for MMDF mailboxes you need a prefix as well as a suffix to get it


@@ -3667,7 +3660,7 @@ Q0606: I'm using tmail to do local deliveries, but when I turned on the
        \use_crlf\ option on the \%pipe%\ transport (tmail prefers \"@\r@\n"\
        terminations) message bodies started to vanish.
 
        \use_crlf\ option on the \%pipe%\ transport (tmail prefers \"@\r@\n"\
        terminations) message bodies started to vanish.
 

-A0606: You need to unset the \mesage_prefix\ option, or change it so that its
+A0606: You need to unset the \message_prefix\ option, or change it so that its

        default \"@\n"\ terminator becomes \"@\r@\n"\. For example, the
        transport could be:
 
        default \"@\n"\ terminator becomes \"@\r@\n"\. For example, the
        transport could be:
 


@@ -5045,7 +5038,7 @@ A0806: The value of \$domain$\ is the actual domain that appears in the address.
        but it is important to some people - especially if by some unfortunate
        accident the lowercased word is something indecent.
 
        but it is important to some people - especially if by some unfortunate
        accident the lowercased word is something indecent.
 

-       You can trivally force lower casing by means of the \"${lc:"\ operator.
+       You can trivially force lower casing by means of the \"${lc:"\ operator.

        Instead of \"$domain"\ write \"${lc:$domain}"\.
 
 
        Instead of \"$domain"\ write \"${lc:$domain}"\.
 
 


@@ -5106,7 +5099,7 @@ A0905: You can only do this in a round about way, using filter commands like
 
 ==>      headers add "New-Subject: SPAM: $h_subject:"
          headers remove subject
 
 ==>      headers add "New-Subject: SPAM: $h_subject:"
          headers remove subject

-         neaders add "Subject: $h_new-subject:"
+         headers add "Subject: $h_new-subject:"

          headers remove new-subject
 
        This trick works only in system filters, where the commands are obeyed
          headers remove new-subject
 
        This trick works only in system filters, where the commands are obeyed


@@ -7129,7 +7122,7 @@ C037:  An elegant way of using ETRN, which does immediate delivery if the host
 C042:  ``Since the Exim 4 configuration needed to get Mailman to work differs a
        little bit from Exim 3 and since I still haven't seen a recipe for
        Mailman with Exim 4, I'm providing my configuration (based heavily on
 C042:  ``Since the Exim 4 configuration needed to get Mailman to work differs a
        little bit from Exim 3 and since I still haven't seen a recipe for
        Mailman with Exim 4, I'm providing my configuration (based heavily on

-       \?http://www.exim.org/howto/mailman.html?\).''
+       \?https://www.exim.org/howto/mailman21.html?\).''

 
 C043:  ``Attached is an Exim 4 config file which is designed for an Exim server
        that is put in front of an Exchange 5.5 system but which verifies the
 
 C043:  ``Attached is an Exim 4 config file which is designed for an Exim server
        that is put in front of an Exchange 5.5 system but which verifies the