RelativeResourceManager22

RelativeResourceManager22 - CprE 530 Lecture 18 Topics...

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CprE 530 Lecture 18 Topics Email – POP & IMAP • Protocol • Vulnerabilities and countermeasures – MIME • Vulnerabilities and countermeasures
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Local User Agent User MTA OS dependent Storage OS dependent transfer Mail server Local User agent Remote User Agent Storage Post Office Protocol OS dependent Storage SMTP Authentication Remote User Agent
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Remote access to local UA User WEB or other protocol MTA OS dependent Storage OS dependent transfer Authentication Mail server Remote Access to Local User agent Storage POP Post Office Protocol Used to transfer mail between the mail server and a PC Provides user Authentication
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POP3 protocol POP3 client “logs in” to a POP3 server (TCP port 110) Login name and password in clear text • User can configure how often mail is checked – this means the login and password can be sent many times a day – easy to capture since when there is no mail there are only a few packets exchanged. POP3 block diagram POP3 Server inbound UA SMTP Server outbound
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POP3 Commands USER name Login name PASS string User password STAT returns number of messages LIST [msg] returns the size of msg or all messages if [msg] is not supplied RETR msg send client the full message [msg] DELE msg Delete message from server NOOP No operation RSET Reset deletion indicators POP3 Commands Quit Quit the session APOP name digest Optional authentication TOP msgn return first n lines of message UIDL returns a unique ID string for the requested message, does not change during session. Message ID can used to request message.
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POP3 Responses Two response codes – -ERR message – +OK message POP3 Protocol POP3 Client POP3 Server
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This note was uploaded on 11/22/2009 for the course CPR E 530 taught by Professor Staff during the Spring '08 term at Iowa State.

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RelativeResourceManager22 - CprE 530 Lecture 18 Topics...

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