Extracting credentials from pcap

I have a large number of pcaps from sensors around a network.  I'd like 
to be able to extract details of authentications (e.g. HTTP, POP, IMAP) 
and credentials from these, with dates and times so I can draw up a 
report for a customer.  Unfortunately they seem to have neglected to 
implement decent logging and now they are stuck.

dsniff is fantastic at pulling out various credentials but it doesn't 
get the dates correct from pcap.  When digging about the source code it 
seems that dsniff just prints the current time/date when it finds a new 
record.  It doesn't even seem that libnids passes the pcap timestamp.

So I'm looking for other ideas to extract credentials along with the 
date and time of their occurrence.  This way I can hopefully have a 
decent log of what happened when and find out "whodunnit".

Any ideas?

David

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