X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/9c2b45c9eafbcceb99cbcdcc2075088d7a2a74de..e236f915d39e27c89ac6e9ef8dd6bdf38f164a6b:/doc/doc-src/FAQ.src diff --git a/doc/doc-src/FAQ.src b/doc/doc-src/FAQ.src index b53070e07..1d43cbcd2 100644 --- a/doc/doc-src/FAQ.src +++ b/doc/doc-src/FAQ.src @@ -1,4 +1,3 @@ -## $Cambridge: exim/doc/doc-src/FAQ.src,v 1.8 2009/11/05 19:37:00 nm4 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 @@ -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 - 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 @@ -911,7 +912,7 @@ A0047: \-bz-\ is a Sendmail option requesting it to create a `configuration free ==> /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 @@ -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 - 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? @@ -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 - 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 @@ -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 - 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 @@ -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 - 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 @@ -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 - 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 @@ -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 - 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 @@ -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. -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: @@ -5045,7 +5038,7 @@ A0806: The value of \$domain$\ is the actual domain that appears in the address. but it is important to some people - especially if by some unfortunate accident the lowercased word is something indecent. - You can trivally force lower casing by means of the \"${lc:"\ operator. + You can trivially force lower casing by means of the \"${lc:"\ operator. Instead of \"$domain"\ write \"${lc:$domain}"\. @@ -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 - 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