Package: sendmail-bin
Version: 8.14.4-4
Severity: normal
File: /usr/lib/sm.bin/mail.local
The wheezy mail.local is unable to deliver mail. I was getting syslog
lines like:
Jan 26 07:41:37 bari mail.local[11136]: lockmailbox psz failed; error code 75
Jan 26 07:41:37 bari sm-mta[11135]: s0PKfb67011134:
to=<p...@bari.maths.usyd.edu.au>, delay=00:00:00, xdelay=00:00:00,
mailer=local, pri=30977, dsn=4.0.0, stat=Deferred: local mailer
(/usr/lib/sm.bin/mail.local) exited with EX_TEMPFAIL
Looking into the problem with strace, I noticed that running mail.local
with "strace -f" allowed it to succeed. A possible workaround is to move
mail.local to some new name and replacing or wrapping it with a script:
#!/bin/bash -
# mail.local fails, but behind strace it works just fine... weird??!!
# Start by doing:
# mv -i /usr/lib/sm.bin/mail.local /usr/lib/sm.bin/mail.local.REAL
# then create this script in its place.
exec strace -o /dev/null -f /usr/lib/sm.bin/mail.local.REAL "$@"
=====
The following short C code demonstrates the issue.
/*
Testing with code mimicking sendmail mail.local .
Compile with
cc mytest.c -llockfile
Fails when running "plain" or with strace, but succeeds
when running with strace -f as shown below:
root# ./a.out
lockmailbox psz code 2 errno=1
root# strace -o outx ./a.out
lockmailbox psz code 2 errno=1
root# strace -o outy -f ./a.out
root#
Another oddity: in the output of "strace -f" I see
geteuid32() return 0 within the children (in the execed
/usr/bin/dotlockfile): should not that return 1001?
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <maillock.h>
int
main(argc, argv)
int argc;
char *argv[];
{
/* name and UID of some plain user */
char *p = "psz";
uid_t uid = 1001;
int off;
/* use a reasonable umask */
(void) umask(0077);
/* change UID for quota checks */
if (setreuid(0, uid) < 0)
{
printf("450 setreuid(0, %d) errno=%d (r=%d, e=%d)\n",
(int) uid, errno, (int) getuid(), (int) geteuid());
exit(1);
}
if ((off = maillock(p, 15)) != 0)
{
printf("lockmailbox %s code %d errno=%d\n", p, off, errno);
}
mailunlock();
}
=====
Thanks, Paul
Paul Szabo p...@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics University of Sydney Australia
-- Package-specific info:
Ouput of /usr/share/bug/sendmail-bin/script:
ls -alR /etc/mail:
/etc/mail:
total 124
drwxr-sr-x 7 smmta smmsp 1024 Jan 23 07:41 .
drwxr-xr-x 172 root root 10240 Jan 23 11:11 ..
-rwxr-xr-- 1 root smmsp 8043 Jan 23 09:00 Makefile
-rw------- 1 root root 4261 Jan 22 12:35 access
-rw-r----- 1 smmta smmsp 3072 Dec 22 2009 access.db
-rw-r--r-- 1 root smmsp 0 Dec 22 2009 aliases
-rw-r----- 1 smmta smmsp 3072 Jan 23 07:41 aliases.db
-rw-r--r-- 1 root smmsp 2804 Jan 23 09:00 databases
-rw-r--r-- 1 root root 5657 Jul 17 2008 helpfile
-rw-r--r-- 1 root smmsp 33 Dec 22 2009 local-host-names
drwxr-sr-x 2 smmta smmsp 1024 Dec 22 2009 m4
drwxr-xr-x 2 root root 1024 Jan 22 12:35 peers
drwxr-xr-x 2 root smmsp 1024 Jul 16 2008 sasl
-rw-r--r-- 1 root smmsp 9491 Jan 23 07:41 sendmail.cf
-rw-r--r-- 1 root root 8997 Jan 22 12:35 sendmail.cf.old
-rw-r--r-- 1 root root 10032 May 6 2002 sendmail.conf
-rw-r--r-- 1 root smmsp 46 Jan 23 07:41 sendmail.mc
drwxr-sr-x 2 smmta smmsp 1024 Dec 22 2009 smrsh
-rw-r--r-- 1 root smmsp 8844 Jan 23 07:41 submit.cf
-rw-r--r-- 1 root smmsp 55 Jan 22 12:35 submit.cf.errors
-rw-r--r-- 1 root root 8350 Jan 22 12:35 submit.cf.old
-rw-r--r-- 1 root smmsp 59 Jan 23 07:41 submit.mc
drwxr-xr-x 2 smmta smmsp 1024 Dec 22 2009 tls
-rw-r--r-- 1 root smmsp 0 Dec 22 2009 trusted-users
/etc/mail/m4:
total 2
drwxr-sr-x 2 smmta smmsp 1024 Dec 22 2009 .
drwxr-sr-x 7 smmta smmsp 1024 Jan 23 07:41 ..
-rw-r----- 1 root smmsp 0 Dec 22 2009 dialup.m4
-rw-r----- 1 root smmsp 0 Dec 22 2009 provider.m4
/etc/mail/peers:
total 2
drwxr-xr-x 2 root root 1024 Jan 22 12:35 .
drwxr-sr-x 7 smmta smmsp 1024 Jan 23 07:41 ..
/etc/mail/sasl:
total 2
drwxr-xr-x 2 root smmsp 1024 Jul 16 2008 .
drwxr-sr-x 7 smmta smmsp 1024 Jan 23 07:41 ..
/etc/mail/smrsh:
total 2
drwxr-sr-x 2 smmta smmsp 1024 Dec 22 2009 .
drwxr-sr-x 7 smmta smmsp 1024 Jan 23 07:41 ..
lrwxrwxrwx 1 root smmsp 26 Dec 22 2009 mail.local ->
/usr/lib/sm.bin/mail.local
lrwxrwxrwx 1 root smmsp 17 Dec 22 2009 procmail -> /usr/bin/procmail
lrwxrwxrwx 1 root smmsp 17 Dec 22 2009 vacation -> /usr/bin/vacation
/etc/mail/tls:
total 23
drwxr-xr-x 2 smmta smmsp 1024 Dec 22 2009 .
drwxr-sr-x 7 smmta smmsp 1024 Jan 23 07:41 ..
-rw-r--r-- 1 root root 7 Dec 22 2009 no_prompt
-rw------- 1 root root 1191 Dec 22 2009 sendmail-client.cfg
-rw-r--r-- 1 root smmsp 1249 Dec 22 2009 sendmail-client.crt
-rw------- 1 root root 1025 Dec 22 2009 sendmail-client.csr
-rw-r----- 1 root smmsp 1675 Dec 22 2009 sendmail-common.key
-rw-r----- 1 root smmsp 1582 Dec 22 2009 sendmail-common.prm
-rw------- 1 root root 1191 Dec 22 2009 sendmail-server.cfg
-rw-r--r-- 1 root smmsp 1249 Dec 22 2009 sendmail-server.crt
-rw------- 1 root root 1025 Dec 22 2009 sendmail-server.csr
-rwxr--r-- 1 root root 3260 Jan 22 12:35 starttls.m4
sendmail.conf:
DAEMON_MODE="Daemon";
DAEMON_PARMS="";
DAEMON_HOSTSTATS="Yes";
DAEMON_MAILSTATS="No";
QUEUE_MODE="${DAEMON_MODE}";
QUEUE_INTERVAL="10";
QUEUE_PARMS="";
MSP_MODE="${QUEUE_MODE}";
MSP_INTERVAL="${QUEUE_INTERVAL}";
MSP_PARMS="${QUEUE_PARMS}";
MSP_MAILSTATS="No";
MISC_PARMS="";
CRON_MAILTO="root";
CRON_PARMS="";
AGE_DATA="";
DAEMON_STATS="${DAEMON_MAILSTATS}";
MSP_STATS="${MSP_MAILSTATS}";
sendmail.mc:
[trigger for usr/share/sendmail/sm_helper.sh]
submit.mc...
FEATURE(`msp [trigger for usr/share/sendmail/sm_helper.sh]
-- System Information:
Debian Release: 7.3
APT prefers stable
APT policy: (500, 'stable')
Architecture: i386 (x86_64)
Kernel: Linux 3.2.51-pk06.21-amd64 (SMP w/8 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash
Versions of packages sendmail-bin depends on:
ii libc6 2.13-38
ii libdb5.1 5.1.29-5
ii libldap-2.4-2 2.4.31-1+nmu2
ii liblockfile1 1.09-5
ii libsasl2-2 2.1.25.dfsg1-6+deb7u1
ii libssl1.0.0 1.0.1e-2+deb7u3
ii libwrap0 7.6.q-24
ii procps 1:3.3.3-3
ii sendmail-base 8.14.4-4
ii sendmail-cf 8.14.4-4
sendmail-bin recommends no packages.
Versions of packages sendmail-bin suggests:
ii libsasl2-modules 2.1.25.dfsg1-6+deb7u1
ii openssl 1.0.1e-2+deb7u3
pn sasl2-bin <none>
ii sendmail-doc 8.14.4-4
Versions of packages sensible-mda depends on:
ii libc6 2.13-38
ii procmail 3.22-20
Versions of packages rmail depends on:
ii libc6 2.13-38
ii libldap-2.4-2 2.4.31-1+nmu2
-- Configuration Files:
/etc/init.d/sendmail changed [not included]
-- no debconf information
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