Here are some notes on the Kerio Mailserver, version 6.1. My interest lays on the storage as I’m going to do some data injection :-)
kerio/$ ls
store/mail/domain.tld/username/ - that's it. see below. store/mail/domain.tld/#public/ - shared user? store/logs/ - ascii text log files and index for each of them store/queue/nn/* - hashes or maildir or somewhat? store/queue/pickup/ - working directory? store/spamassassin/* - uninteresting store/tmp/* - not interesting
kerio/store/mail/domain.tld/username/$ ls
Calendar - Calendar data, vcal + index Contacts - Contacts, vcard + index Deleted Items - All types + index Drafts - mail? INBOX - mail? Junk E-mail - mail? Sent Items - mail? Tasks - unknown filter.siv - mail filters, perl-like syntax folder.map - shared folders mapping, simple xml settings.usr - serialized php structure stats.usr - unknown sub.fld - optional (mail) folders
kerio/store/mail/domain.tld/username/Folder/$ ls
#assoc/ - unknown #msgs/*.eml - VCALENDAR, VCARD, Mail, whatever subfolders/ - like Folder, unsure where they are linked deleted.fld - ??? unix timestamp + filename index.fld - see below. properties.fld - unknown search.fld - sqlite2 database, somewhat broken; useless (or other format???) sort.fld - unknown, may be cache status.fld - unknown
kerio/store/mail/domain.tld/username/Folder/$ cat index.fld
U00000001 F80000001 S1133 D43032abf M4305f1b7 I0001 CIPM.Appointment
Format:
Unnnnnnnn = file name (#msg/nnnnnnnn.eml)
Fnnnnnnnn = unknown (assuming signed int, always? -2^31+1)
Snnnn = unknown
Dnnnnnnnn = create date (hex encoded unix timestamp)
Mnnnnnnnn = modify date (hex encoded unix timestamp)
Innnn = incremental counter
CIPM.* = file type
… = optional data behind
kerio/store/mail/domain.tld/username/Folder/$ cat deleted.fld
431d8fa3 00000005
Format:
timestamp (hex encoded) + filename
kerio/store/mail/domain.tld/username/Folder/$ cat status.fld
T2 G64590354-03bc-46fa-9d94-b5c19be217d7 V430adb2c U0000000c C00000001 M6 D0 R0 N0 S7514 Auser@domain.tld lrswicda
Format:
T – unknown
G – unique id, probably used to identify folder
V – timestamp, folder create date
U – next filename to use
C – counter?
M – folder type?
D – unknown, some delete flag?
R – unknown
N – unknown
S – unknown
A – mail address / user id + permissions?
That’s all. May be it helps you to tinker with the backend.