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#!/bin/sh -e #----------------------------------------------------------------------------- # $Sendmail: sendmailconfig,v 8.15.2 2021-12-09 00:18:01 cowboy Exp $ # # Interactively configure Sendmail for Debian # # Copyright (c) 1998-2010 Richard Nelson. All Rights Reserved. # # Robert Leslie <rob@mars.org>, # Rick Nelson <cowboy@debian.org> # #----------------------------------------------------------------------------- set -e; PATH='/usr/sbin:/usr/bin:/sbin:/bin'; SENDMAIL_MC="/etc/mail/sendmail.mc"; SUBMIT_MC="/etc/mail/submit.mc"; # Path to other sendmail helpers if [ -x ./update_sendmail ]; then sm_path='.'; elif [ -x $(dirname $0)/update_sendmail ]; then sm_path=$(dirname $0); else sm_path=/usr/share/sendmail; fi; # Bring in sendmail.conf for the network definitions if [ ! -f /etc/mail/sendmail.conf ]; then if [ -x $sm_path/update_conf ]; then $sm_path/update_conf; fi; fi; if [ -f /etc/mail/sendmail.conf ]; then . /etc/mail/sendmail.conf; fi; set +e; reload="yes"; umask 022; #------------------------------------------------------------------------------ while [ $# -gt 0 ]; do case "$1" in --no-reload) reload=""; shift; ;; *) echo "Usage: $0 [--no-reload]" >&2; exit 1; ;; esac; done; #------------------------------------------------------------------------------ descrip() { echo ''; echo "$1"; echo "$1" | sed -e 's/./-/g'; cat -; echo ''; }; yesno() { local N='N' Y='Y'; local q="$1" def=$(eval "echo -n \$$2"); while :; do echo -n "$q? [$def] "; read REPLY; REPLY=$(echo -n "$REPLY" | sed -e "s/^\ *//" -e "s/^\t*//"); test -n "$REPLY" || REPLY="$def"; case "$REPLY" in [Yy]*) echo yes > /dev/null; eval "$2=\"Y\""; return 0; ;; [Nn]*) echo no > /dev/null; eval "$2=\"N\""; return 1; ;; esac; done; }; input() { local q="$1" def="$(eval "echo -n \$$2")"; echo -n "$q? [$def] "; read REPLY REPLY=$(echo "$REPLY" | sed -e 's/^[ ]*//' -e 's/[ ]*$//' | cat); test -n "$REPLY" || REPLY="$def"; if [ "NONE" = "$3" ]; then case "$REPLY" in [Nn][Oo][Nn][Ee]*) REPLY=''; ;; esac; fi; eval "$2=\"$REPLY\""; }; testconfig() { CONFIG=$(grep -Ee "^[[:space:]]*$1" $SENDMAIL_MC 2>/dev/null); }; makecf() { if [ -x $sm_path/update_sendmail ]; then echo "Updating sendmail environment ..."; $sm_path/update_sendmail || true; fi; if [ "$reload" ] && \ yesno \ "Reload the running sendmail now with the new configuration" Y then echo "Reloading sendmail ..."; /etc/init.d/sendmail reload >/dev/null; fi; } #------------------------------------------------------------------------------ if [ -f $SENDMAIL_MC ]; then if yesno "Configure sendmail with the existing /etc/mail/sendmail.conf" Y then if ! $sm_path/update_conf; then echo "Correct /etc/mail/sendmail.conf before continuing."; exit 1; fi; else echo "Edit /etc/mail/sendmail.conf and reissue $0."; exit 0; fi; if yesno "Configure sendmail with the existing $SENDMAIL_MC" Y then makecf; exit 0; fi; fi; ############################################################################### exec 3>$SENDMAIL_MC.new; trap "rm -f $SENDMAIL_MC.new" 0; ############################################################################### descrip "Sendmail Configuration" <<-EOT By answering the following questions, you can configure sendmail for your system. Default values are determined either by your existing configuration or from common usage. EOT echo -n "Press [ENTER] "; read REPLY; cat /usr/share/sendmail/cf/debian/sendmail.mc >&3; cp -a /usr/share/sendmail/cf/debian/submit.mc \ $SUBMIT_MC.new; echo "LOCAL_CONFIG" >&3; ############################################################################### descrip "Mail Name" <<EOT Your \`mail name' is the hostname portion of the address to be shown on outgoing news and mail messages (following the username and @ sign). This name will be used by other programs besides sendmail; it should be the single, full domain name (FQDN) from which mail will appear to originate. EOT mailname=$(cat /etc/mailname 2>/dev/null || hostname --fqdn); input "Mail name" mailname; echo "$mailname" >/etc/mailname; ############################################################################### descrip "Null Client" <<EOT A special configuration known as the "null client" can be created for this host if all mail should be forwarded to a central hub via a local SMTP-based network. This may be a suitable configuration if you want to forward all of your mail to your local Internet service provider (ISP) for delivery. To enable this option, give the name of the host to which all mail should be forwarded. Otherwise leave the option empty to disable it. To remove a prior name, use \`NONE'. EOT nullclient="" ! testconfig "FEATURE\(\`?nullclient" || nullclient=$(echo -n "$CONFIG" | sed -e 's/[^,]*, *\([^)]*\).*/\1/'); input "Null client forward host" nullclient NONE; if [ ! -z "$nullclient" ]; then echo "EXPOSED_USER(root uucp)dnl # users exempt from masquerading" >&3; echo "LOCAL_USER(root)dnl" >&3; echo "MASQUERADE_AS(\`$mailname')dnl" >&3; echo "FEATURE(\`allmasquerade')dnl" >&3; echo "FEATURE(\`masquerade_envelope')dnl" >&3; echo "FEATURE(\`nullclient', $nullclient)dnl" >&3; fi; if [ -z "$nullclient" ]; then ############################################################################### descrip "Smart Host" <<EOT A "Smart Host" is one that can deliver mail to external machines. By using a "Smart Host", we don't need DNS, or good connectivity ourselves. This is most likely what you want if you have a dialup link, or sit behind a firewall. To enable this option, give the name of the host to which all non-local mail should be forwarded. Otherwise leave the option empty. To remove a prior name, use \`NONE'. EOT smarthost=""; #if [ -n "$nullclient" ]; then # smarthost="$nullclient" # fi ! testconfig "define\(\`?SMART_HOST" || smarthost=$(echo -n "$CONFIG" | sed -e 's/[^:]*:*\([^)]*\).*/\1/'); input "Smart Host:" smarthost NONE; if [ -n "$smarthost" ]; then echo "define(\`SMART_HOST', $smarthost)dnl" >&3; echo "MASQUERADE_AS(\`$mailname')dnl" >&3; fi; #if [ -n "$nullclient" ] && [ ! -z "$smarthost" ]; then # echo "undefine(\`ALIAS_FILE')dnl" >&3 # echo "define(\`confFORWARD_PATH', \`')dnl" >&3 # echo "define(\`MAIL_HUB', \`$smarthost')dnl" >&3 # echo "MASQUERADE_AS(\`$smarthost')dnl" >&3 # echo "FEATURE(\`allmasquerade')dnl" >&3 # echo "FEATURE(\`masquerade_envelope')dnl" >&3 # fi ############################################################################### descrip "Address Canonification" <<EOT Usually sendmail will canonify all addresses by consulting a name server and resolving hosts to their fully qualified domain name (FQDN). Under special circumstances you may want to disable this feature, for example if this machine acts only as a mail gateway. EOT test -z "$nullclient" || cat <<EOT Since this host will be configured as a null client, this option controls whether addresses will be qualified with \`$mailname' when sent to the central hub via SMTP. Disabling this feature may cause mail to appear to come from (and be qualified by the domain for) the hub machine rather than this host. EOT nocanonify="N"; ! testconfig "FEATURE\(\`?nocanonify" || nocanonify="Y"; ! yesno "Disable address canonification" nocanonify || \ echo "FEATURE(\`nocanonify')dnl" >&3; ############################################################################### #descrip "SMTP Mailer" <<EOT #If you plan to exchange mail with other computers, you should enable the #SMTP mailer. Even if you don't plan to exchange mail with other computers, #it is still a good idea to enable this so local programs can use it. #EOT smtp="Y"; #if [ -f $SENDMAIL_MC ]; then # testconfig "MAILER\(\`?smtp" || smtp="N"; #fi; #yesno "Enable the SMTP mailer" smtp || true; ############################################################################### descrip "Masquerade Envelope" <<EOT If you want mail envelopes (as well as mail headers) to appear to come from \`$mailname', you can enable this option. EOT masqenvelope="Y"; if [ -f $SENDMAIL_MC ]; then testconfig "FEATURE\(\`?masquerade_envelope" || masqenvelope="N"; fi; ! yesno "Masquerade envelopes" masqenvelope || \ echo "FEATURE(\`masquerade_envelope')dnl" >&3; ############################################################################### descrip "All Masquerade" <<EOT If enabled, this feature will cause recipient addresses to also appear to come from \`$mailname'. Normally they get the local hostname. Although this may be right for ordinary users, it can break local aliases. For example, if you send to "localalias", the originating sendmail will find that alias and send to all members, but send the message with "To: localalias@$mailname". Since that alias likely does not exist, replies will fail. Use this feature ONLY if you can guarantee that the ENTIRE namespace of \`$mailname' supersets all the local entries. If in doubt, it is safe to leave this option disabled. EOT allmasquerade="N"; ! testconfig "FEATURE\(\`?allmasquerade" || allmasquerade="Y"; ! yesno "All masquerade" allmasquerade || \ echo "FEATURE(\`allmasquerade')dnl" >&3; ############################################################################### descrip "Dont masquerade mail to local users" <<EOT Send mail to local recipients without masquerading. EOT local_no_masquerade="N"; ! testconfig "FEATURE\(\`?local_no_masquerade" || local_no_masquerade="Y"; ! yesno "Dont masquerade local" local_no_masquerade || echo "FEATURE(\`local_no_masquerade')dnl" >&3; ############################################################################### descrip "Always Add Domain" <<EOT If enabled, the local host domain is included even on locally delivered mail. Normally it is not added unless it is already present. EOT alwaysdomain="N"; ! testconfig "FEATURE\(\`?always_add_domain" || alwaysdomain="Y"; ! yesno "Always add domain" alwaysdomain || \ echo "FEATURE(\`always_add_domain')dnl" >&3; ############################################################################### descrip "Mail Acceptance" <<EOT Sendmail is usually configured to accept mail for your mail name ($mailname). However, under special circumstances you may not wish sendmail to do this, particularly if (and disabling this option generally requires that) mail for \`$mailname' is MXed to another host. If in doubt, it is safe to leave this option enabled. EOT acceptmailname="Y"; if [ -f $SENDMAIL_MC ]; then testconfig "^Cw.*$mailname" || acceptmailname="N"; fi; yesno "Accept mail for \`$mailname'" acceptmailname || true; test "N" = "$acceptmailname" || \ echo "LOCAL_CONFIG Cw$mailname" >&3; ############################################################################### descrip "Alternate Names" <<EOT In addition to the canonical mail name \`$mailname', you can add any number of additional alternate names to recognize for receiving mail. If other hosts are MXed to you for local mail, this is where you should list them. This list is saved into the file /etc/mail/local-host-names so it can be changed later as needed. To answer this question, separate each alternate name with a space, or answer \`NONE' to eliminate all alternate names. EOT cw_file="/etc/mail/local-host-names"; altnames=$(cat "$cw_file" 2>/dev/null | tr -s '\n \t' ' ' | sed -e 's/^ *//' -e 's/ *$//'); input "Alternate names" altnames NONE; if [ -n "$altnames" ]; then echo "$altnames" | tr -s ' \t' '\n' >$cw_file; else echo "localhost" >$cw_file; fi; chown root:smmsp $cw_file; chmod 0644 $cw_file; echo "FEATURE(\`use_cw_file')dnl" >&3; ############################################################################### descrip "Trusted Users" <<EOT Sendmail allows a special group of users to set their envelope "From" address using the -f option without generating a warning message. If you have software such as Majordomo installed, you will want to include the usernames from such software here. Note that "root", "daemon", and "uucp" are included automatically and do not need to be specified. This list is saved into the file /etc/mail/trusted-users so it can be changed later as needed. To answer this question, separate each username with a space, or answer \`NONE' to eliminate all usernames. EOT ct_file="/etc/mail/trusted-users"; trusted=$(cat "$ct_file" 2>/dev/null | tr -s '\n \t' ' ' | sed -e 's/^ *//' -e 's/ *$//'); input "Trusted users" trusted NONE; if [ -n "$trusted" ]; then echo "$trusted" | tr -s ' \t' '\n' >$ct_file; chown root:smmsp $ct_file; chmod 0644 $ct_file; else cat /dev/null >$ct_file; fi; echo "FEATURE(\`use_ct_file')dnl" >&3; echo "FEATURE(\`use_ct_file')dnl" >> $SUBMIT_MC.new; ############################################################################### descrip "Redirect Feature" <<EOT If enabled, this feature will allow you to alias old names to <new-address>.REDIRECT, causing sendmail to return mail to the sender with an error but indicating the recipient's new address. EOT redirect="N"; ! testconfig "FEATURE\(\`?redirect" || redirect="Y"; ! yesno "Enable redirect option" redirect || \ echo "FEATURE(\`redirect')dnl" >&3; ############################################################################### descrip "UUCP Addresses" <<EOT Sendmail can be configured to be smart about UUCP addresses, or it can do nothing special with UUCP addresses at all. If you care about UUCP, you will need to do some additional configuration, perhaps outside of this script. *** NOTE *** If you use a smart host or do any kind of forwarding (ie LUSER_RELAY and LOCAL_RELAY), it is important that you say "Yes" here to prevent a multi-level relay hole - unless you know for *SURE* that your smart-host does not deal with UUCP addresses. (Be safe and just say Y) EOT uucp="Y"; if [ -f $SENDMAIL_MC ]; then testconfig "FEATURE\(\`?nouucp" || uucp="Y"; fi; yesno "Enable UUCP addressing" uucp || \ echo "FEATURE(\`nouucp', \`reject')dnl" >&3; ############################################################################### descrip "Sticky Host" <<EOT If enabled, mail sent to \`user@$mailname' is marked as "sticky" -- that is, the local addresses aren't matched against UDB and don't go through ruleset 5. This is used if you want a setup where \`user' is not necessarily the same as \`user@$mailname', e.g., to make a distinct domain-wide namespace. If in doubt, it is safe to leave this option disabled. EOT sticky="N"; ! testconfig "FEATURE\(\`?stickyhost" || sticky="Y"; ! yesno "Enable sticky host option" sticky || \ echo "FEATURE(\`stickyhost')dnl" >&3; ############################################################################### descrip "DNS" <<EOT If you are directly connected to the Internet and have access to a domain name server, you should enable this option. EOT dns="Y"; ! testconfig "FEATURE\(\`?nodns" || dns="N"; ! testconfig "HACK\(\`?nodns" || dns="N"; yesno "Enable DNS" dns || \ echo "HACK(\`nodns')dnl" >&3; ############################################################################### if [ Y = "$dns" ]; then ############################################################################### descrip "Best MX is Local" <<EOT If enabled, this option will cause sendmail to accept mail as though locally addressed for any host that lists this machine as the best possible MX record. This generates additional DNS traffic, but should be OK for low-to-medium traffic hosts. N.B.: This feature is fundamentally incompatible with wildcard MX records. If you have a wildcard MX record that matches your domain, you cannot use this feature. EOT bestmxlocal="N"; ! testconfig "FEATURE\(\`?bestmx_is_local" || bestmxlocal="Y"; ! yesno "Assume best MX is local" bestmxlocal || \ echo "FEATURE(\`bestmx_is_local')dnl" >&3; ############################################################################### fi; # finished DNS configuration ############################################################################### descrip "Mailertable" <<EOT If enabled, this option causes sendmail to read mail routing rules from the text file /etc/mail/mailertable. This is needed for unusual mailers like ifmail and fax programs. More information is in /usr/share/doc/sendmail-doc/op/op.txt.gz. EOT mailertable="N"; ! testconfig "FEATURE\(\`?mailertable" || mailertable="Y"; ! yesno "Enable the mailertable feature" mailertable || \ echo "FEATURE(\`mailertable')dnl" >&3; ############################################################################### descrip "Sendmail Restricted Shell" <<EOT If enabled, this option causes sendmail to use the sendmail restricted shell program (smrsh) instead of /bin/sh for mailing to programs. This improves your ability to control what gets run via email; only those programs which appear in a special directory can be run. If you enable this option, please carefully read the smrsh(8) man page for further information. EOT smrsh="Y"; ! testconfig "FEATURE\(\'?smrsh" || smrsh="Y"; ! yesno "Use the Sendmail Restricted Shell (smrsh)" smrsh || \ echo "FEATURE(\`smrsh', \`/usr/libexec/sendmail/smrsh')dnl" >&3; ############################################################################### #descrip "Mailer Name" <<EOT #You can change the name used for internally generated outgoing messages. #Usually this is \`MAILER-DAEMON' but it would not be unreasonable to change #it to something such as \`postmaster'. #EOT #daemon="MAILER-DAEMON"; #! testconfig "define\(\`?confMAILER_NAME" || # daemon=$(echo -n "$CONFIG" | sed -e 's/[^,]*, *`\([^'"'"']*\).*/\1/'); #input "Mailer name" daemon; #test "MAILER-DAEMON" = "$daemon" || # echo "define(\`confMAILER_NAME', \`$daemon')dnl" >&3; ############################################################################### #descrip "Me Too" <<EOT #Sendmail normally excludes the sender address from group expansion. Enabling #this option will cause the sender to be included. #EOT #metoo="N"; #! testconfig "define\(\`?confME_TOO.*True" || metoo="Y"; #! yesno "Enable me too option" metoo || # echo "define(\`confME_TOO', True)dnl" >&3; ############################################################################### descrip "Message Timeouts" <<EOT Sendmail will issue a warning message to the sender if it can't deliver a message within a reasonable amount of time. It will also send a failure notification and give up trying to deliver the message if it can't deliver it after an unreasonable amount of time. You can configure the message timeouts after which warning and failure notifications are sent. Sendmail's defaults are 4 hours and 5 days (4h/5d), respectively, but many people feel warnings after only 4 hours are premature. EOT qw="4h"; ! testconfig "define\(\`?confTO_QUEUEWARN" || qw=$(echo -n "$CONFIG" | sed -e 's/[^,]*, *`\([^'"'"']*\).*/\1/'); qr="5d"; ! testconfig "define\(\`?confTO_QUEUERETURN" || qr=$(echo -n "$CONFIG" | sed -e 's/[^,]*, *`\([^'"'"']*\).*/\1/'); timeouts="$qw/$qr"; input "Message timeouts" timeouts; qw=$(expr "$timeouts" : '\([^/]*\)/'); qr=$(expr "$timeouts" : '[^/]*/\(.*\)'); test "4h" = "$qw" || echo "define(\`confTO_QUEUEWARN', \`$qw')dnl" >&3; test "5d" = "$qr" || echo "define(\`confTO_QUEUERETURN', \`$qr')dnl" >&3; ############################################################################### # Support dialup configuration cat <<-EOT >&3 dnl # dnl # Dialup/LAN connection overrides dnl # include(\`/etc/mail/m4/dialup.m4')dnl include(\`/etc/mail/m4/provider.m4')dnl dnl # EOT ############################################################################### echo "MAILER_DEFINITIONS" >&3 echo "MAILER(local)dnl" >&3 test "N" = "$smtp" || echo "MAILER(smtp)dnl" >&3; ############################################################################### if [ -e /etc/ifmail/config ] && \ [ -e /usr/share/sendmail/cf/mailer/ifmail.m4 ]; then echo "MAILER(ifmail)dnl" >&3; fi; ############################################################################### fi; # finished non-"null client" configuration ############################################################################### echo "" >&3; echo "LOCAL_CONFIG" >&3; #if [ -z $nullclient ]; then # echo "MASQUERADE_AS($mailname)dnl" >&3 # fi if [ -f $SENDMAIL_MC ]; then sed -n -e '/^## Custom/,$p' $SENDMAIL_MC >&3; else echo "## Custom configurations below (will be preserved)" >&3; fi; descrip "Configuration Complete" <<EOT Advanced configuration, such as alternate mailers, the use of mailertables, Bitnet domains, and UUCP domains can be accomplished by manually editing the $SENDMAIL_MC configuration file and rerunning \`$0' to generate the appropriate /etc/mail/sendmail.cf file. (Local changes made at the end of $SENDMAIL_MC will be preserved by \`$0'.) The m4 library files for sendmail configuration are kept in the /usr/share/sendmail/cf directory. You may wish to review the documentation in /usr/share/doc/sendmail to assist in further customization. You may wish to customize your alias database; see the aliases(5) man page for information on the format and use of the /etc/aliases file. EOT ############################################################################### exec 3>&-; if [ -f $SENDMAIL_MC ];then echo "Saving old $SENDMAIL_MC as $SENDMAIL_MC.old ..."; mv -f $SENDMAIL_MC $SENDMAIL_MC.old; fi; chown root:smmsp $SENDMAIL_MC.new; chmod 0644 $SENDMAIL_MC.new; mv -f $SENDMAIL_MC.new $SENDMAIL_MC; if [ ! -f /usr/share/sendmail/cf/feature/msp.m4 ]; then chown root:smmsp $SUBMIT_MC.new; chmod 0644 $SUBMIT_MC.new; mv -f $SUBMIT_MC.new $SUBMIT_MC; fi; trap - 0; makecf; exit 0;