Bug#806986: exim4: local_user router does not work for mixed-case users

[Sam Morris]

Package: exim4
Version: 4.84-8
Severity: normal

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I noticed that mail sent by needrestart(1) addressed to Debian-exim was
bouncing.

# exim -d -bt Debian-gdm
...
- --------> local_user router <--------
local_part=debian-gdm domain=wintermute
checking domains
cached yes match for +local_domains
cached lookup data = NULL
wintermute in "+local_domains"? yes (matched "+local_domains" - cached)
checking local_parts
Debian-gdm in "! root"? yes (end of list)
checking for local user
seeking password data for user "debian-gdm": using cached result
getpwnam() returned NULL (user not found)
local_user router skipped: debian-gdm is not a local user

I guess this is because exim ends up calling getpwnam(3) with the
lower-cased local_part rather than the original, mixed-case form.

- -- Package-specific info:
Exim version 4.84 #3 built 17-Feb-2015 17:45:49
Copyright (c) University of Cambridge, 1995 - 2014
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2014
Berkeley DB: Berkeley DB 5.3.28: (September  9, 2013)
Support for: crypteq iconv() IPv6 GnuTLS move_frozen_messages DKIM PRDR OCSP
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz dbmnz dnsdb dsearch nis nis0 passwd
Authenticators: cram_md5 plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore autoreply lmtp pipe smtp
Fixed never_users: 0
Size of off_t: 8
Configuration file is /var/lib/exim4/config.autogenerated
# /etc/exim4/update-exim4.conf.conf
#
# Edit this file and /etc/mailname by hand and execute update-exim4.conf
# yourself or use 'dpkg-reconfigure exim4-config'
#
# Please note that this is _not_ a dpkg-conffile and that automatic changes
# to this file might happen. The code handling this will honor your local
# changes, so this is usually fine, but will break local schemes that mess
# around with multiple versions of the file.
#
# update-exim4.conf uses this file to determine variable values to generate
# exim configuration macros for the configuration file.
#
# Most settings found in here do have corresponding questions in the
# Debconf configuration, but not all of them.
#
# This is a Debian specific file

dc_eximconfig_configtype='smarthost'
dc_other_hostnames=''
dc_local_interfaces='127.0.0.1 ; ::1'
dc_readhost=''
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='smtp.robots.org.uk::587'
CFILEMODE='644'
dc_use_split_config='true'
dc_hide_mailname='false'
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool'
mailname:wintermute

- -- System Information:
Debian Release: 8.2
  APT prefers stable-updates
  APT policy: (550, 'stable-updates'), (550, 'stable'), (540, 'testing'), (530, 'unstable'), (520, 'experimental'), (500, 'testing-updates')
Architecture: amd64 (x86_64)

Kernel: Linux 4.2.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages exim4 depends on:
ii  debconf [debconf-2.0]  1.5.56
ii  exim4-base             4.84-8
ii  exim4-daemon-light     4.84-8

exim4 recommends no packages.

exim4 suggests no packages.

- -- debconf information:
  exim4/drec:

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