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I have discovered that debsum maybe does not work as i thought. I ran

debsum -as

And actually i did not see sshd binary in that list. However md5 of the /usr/sbin/sshd file and the numbers given in /var/lib/dpkg/info/openssh-server.md5sums are different.

cat /var/lib/dpkg/info/openssh-server.md5sums 
968ce0ccc85f3dc64375c689fa165359  usr/lib/openssh/sftp-server
ba856dce069acadff587ca95e8e63551  usr/sbin/sshd
a8f85459802674a416b903c8be7774d6  usr/share/doc/openssh-client/examples/sshd_config
8c5592e0d522fa0f8f55f3c104479ef5  usr/share/lintian/overrides/openssh-server
24e6a2d6f56d5fd52651db030a4124bb  usr/share/man/man5/sshd_config.5.gz
65dbe6d2862940ad7cd945fadaabc2f8  usr/share/man/man8/sftp-server.8.gz
63398534a80e75262e56ac821e2bb3f3  usr/share/man/man8/sshd.8.gz

md5sum /usr/sbin/sshd

What is wrong?

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Which OS and what openssh-server package version? –  mgorven Jun 12 '12 at 5:12
Debian 6.0 and latest openssh-server package: packages.debian.org/squeeze/openssh-server –  Radium Jun 12 '12 at 13:28

1 Answer 1

The MD5 sums should definitely match. I downloaded openssh-server_5.5p1-6+squeeze2_amd64.deb and got the following:

% md5sum usr/sbin/sshd
ba856dce069acadff587ca95e8e63551  usr/sbin/sshd

which matches the openssh-server.md5sums you pasted. I suggest that you reinstall the package.

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I was asking why debsum does not warns me about wrong sshd md5 sum. Finally i found out strange thing. Debsum checks /usr/lib/openssh/sshd file, not /usr/sbin/sshd. /usr/lib/openssh/sshd has correct md5 sum. /var/lib/dpkg/info/openssh-server.md5sums does not contain /usr/lib/openssh/sshd. So why debsum uses wrong paths ... –  Radium Jun 13 '12 at 15:37
@Radium Hrm, that sounds like the file has been diverted with dpkg-divert. Not sure which package would need to do that though. –  mgorven Jun 13 '12 at 16:52

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