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Security | mail_crypt (email/storage encryption)
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docker-mailserver
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< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../usage/" class = "md-nav__link" >
Usage
< / a >
< / li >
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< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_4" type = "checkbox" id = "__nav_4" checked >
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< label class = "md-nav__link" for = "__nav_4" >
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Configuration
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Configuration" data-md-level = "1" >
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< label class = "md-nav__title" for = "__nav_4" >
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< span class = "md-nav__icon md-icon" > < / span >
Configuration
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../environment/" class = "md-nav__link" >
Environment Variables
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../setup.sh/" class = "md-nav__link" >
Your Best Friend setup.sh
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< / a >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4_3" type = "checkbox" id = "__nav_4_3" checked >
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< label class = "md-nav__link" for = "__nav_4_3" >
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User Management
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "User Management" data-md-level = "2" >
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< label class = "md-nav__title" for = "__nav_4_3" >
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< span class = "md-nav__icon md-icon" > < / span >
User Management
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../user-management/accounts/" class = "md-nav__link" >
Accounts
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../user-management/aliases/" class = "md-nav__link" >
Aliases
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4_4" type = "checkbox" id = "__nav_4_4" checked >
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< label class = "md-nav__link" for = "__nav_4_4" >
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Best Practices
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Best Practices" data-md-level = "2" >
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< label class = "md-nav__title" for = "__nav_4_4" >
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< span class = "md-nav__icon md-icon" > < / span >
Best Practices
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../best-practices/dkim/" class = "md-nav__link" >
DKIM
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../best-practices/dmarc/" class = "md-nav__link" >
DMARC
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../best-practices/spf/" class = "md-nav__link" >
SPF
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../best-practices/autodiscover/" class = "md-nav__link" >
Auto-discovery
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_4_5" type = "checkbox" id = "__nav_4_5" checked >
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< label class = "md-nav__link" for = "__nav_4_5" >
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Security
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Security" data-md-level = "2" >
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< label class = "md-nav__title" for = "__nav_4_5" >
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< span class = "md-nav__icon md-icon" > < / span >
Security
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../understanding-the-ports/" class = "md-nav__link" >
Understanding the Ports
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../ssl/" class = "md-nav__link" >
SSL/TLS
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../fail2ban/" class = "md-nav__link" >
Fail2Ban
< / a >
< / li >
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< li class = "md-nav__item md-nav__item--active" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "toc" type = "checkbox" id = "__toc" >
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< label class = "md-nav__link md-nav__link--active" for = "__toc" >
Mail Encryption
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< a href = "./" class = "md-nav__link md-nav__link--active" >
Mail Encryption
< / a >
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< nav class = "md-nav md-nav--secondary" aria-label = "Table of contents" >
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< label class = "md-nav__title" for = "__toc" >
< span class = "md-nav__icon md-icon" > < / span >
Table of contents
< / label >
< ul class = "md-nav__list" data-md-component = "toc" data-md-scrollfix >
< li class = "md-nav__item" >
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< a href = "#single-encryption-key-global-method" class = "md-nav__link" >
Single Encryption Key / Global Method
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< / a >
< / li >
< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../rspamd/" class = "md-nav__link" >
Rspamd
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4_6" type = "checkbox" id = "__nav_4_6" checked >
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< label class = "md-nav__link" for = "__nav_4_6" >
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Troubleshooting
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Troubleshooting" data-md-level = "2" >
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< label class = "md-nav__title" for = "__nav_4_6" >
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< span class = "md-nav__icon md-icon" > < / span >
Troubleshooting
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../troubleshooting/debugging/" class = "md-nav__link" >
Debugging
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../../pop3/" class = "md-nav__link" >
Mail Delivery with POP3
< / a >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4_8" type = "checkbox" id = "__nav_4_8" checked >
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< label class = "md-nav__link" for = "__nav_4_8" >
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Advanced Configuration
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Advanced Configuration" data-md-level = "2" >
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< label class = "md-nav__title" for = "__nav_4_8" >
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< span class = "md-nav__icon md-icon" > < / span >
Advanced Configuration
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../advanced/optional-config/" class = "md-nav__link" >
Optional Configuration
< / a >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4_8_2" type = "checkbox" id = "__nav_4_8_2" checked >
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< label class = "md-nav__link" for = "__nav_4_8_2" >
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Maintenance
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Maintenance" data-md-level = "3" >
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< label class = "md-nav__title" for = "__nav_4_8_2" >
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< span class = "md-nav__icon md-icon" > < / span >
Maintenance
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../advanced/maintenance/update-and-cleanup/" class = "md-nav__link" >
Update and Cleanup
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4_8_3" type = "checkbox" id = "__nav_4_8_3" checked >
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< label class = "md-nav__link" for = "__nav_4_8_3" >
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Override the Default Configs
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Override the Default Configs" data-md-level = "3" >
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< label class = "md-nav__title" for = "__nav_4_8_3" >
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< span class = "md-nav__icon md-icon" > < / span >
Override the Default Configs
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../advanced/override-defaults/dovecot/" class = "md-nav__link" >
Dovecot
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/override-defaults/postfix/" class = "md-nav__link" >
Postfix
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/override-defaults/user-patches/" class = "md-nav__link" >
Modifications via Script
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/auth-ldap/" class = "md-nav__link" >
LDAP Authentication
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/mail-sieve/" class = "md-nav__link" >
Email Filtering with Sieve
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/mail-fetchmail/" class = "md-nav__link" >
Email Gathering with Fetchmail
< / a >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4_8_7" type = "checkbox" id = "__nav_4_8_7" checked >
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< label class = "md-nav__link" for = "__nav_4_8_7" >
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Email Forwarding
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Email Forwarding" data-md-level = "3" >
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< label class = "md-nav__title" for = "__nav_4_8_7" >
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< span class = "md-nav__icon md-icon" > < / span >
Email Forwarding
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../advanced/mail-forwarding/relay-hosts/" class = "md-nav__link" >
Relay Hosts
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
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< li class = "md-nav__item" >
< a href = "../../advanced/mail-forwarding/aws-ses/" class = "md-nav__link" >
AWS SES
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/full-text-search/" class = "md-nav__link" >
Full-Text Search
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
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< li class = "md-nav__item" >
< a href = "../../advanced/kubernetes/" class = "md-nav__link" >
Kubernetes
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
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< li class = "md-nav__item" >
< a href = "../../advanced/ipv6/" class = "md-nav__link" >
IPv6
< / a >
< / li >
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< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" > < path d = "M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25Z" / > < / svg >
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< h1 > Mail Encryption< / h1 >
< div class = "admonition info" >
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< p class = "admonition-title" > Info< / p >
< p > The Mail crypt plugin is used to secure email messages stored in a Dovecot system. Messages are encrypted before written to storage and decrypted after reading. Both operations are transparent to the user.< / p >
< p > In case of unauthorized access to the storage backend, the messages will, without access to the decryption keys, be unreadable to the offending party.< / p >
< p > There can be a single encryption key for the whole system or each user can have a key of their own. The used cryptographical methods are widely used standards and keys are stored in portable formats, when possible.< / p >
< / div >
< p > Official Dovecot documentation: < a href = "https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/" > https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/< / a > < / p >
< hr / >
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< h2 id = "single-encryption-key-global-method" > < a class = "toclink" href = "#single-encryption-key-global-method" > Single Encryption Key / Global Method< / a > < / h2 >
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< ol >
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< li >
< p > Create < code > 10-custom.conf< / code > and populate it with the following:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > # Enables mail_crypt for all services (imap, pop3, etc)
mail_plugins = $mail_plugins mail_crypt
plugin {
mail_crypt_global_private_key = < /certs/ecprivkey.pem
mail_crypt_global_public_key = < /certs/ecpubkey.pem
mail_crypt_save_version = 2
}
< / code > < / pre > < / div >
< / li >
< li >
< p > Shutdown your mailserver (< code > docker-compose down< / code > )< / p >
< / li >
< li >
< p > You then need to < a href = "https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#ec-key" > generate your global EC key< / a > . We named them < code > /certs/ecprivkey.pem< / code > and < code > /certs/ecpubkey.pem< / code > in step #1.< / p >
< / li >
< li >
< p > The EC key needs to be available in the container. I prefer to mount a /certs directory into the container:
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > services< / span > < span class = "p" > :< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "nt" > mailserver< / span > < span class = "p" > :< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "nt" > image< / span > < span class = "p" > :< / span > < span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > docker.io/mailserver/docker-mailserver:latest< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "nt" > volumes< / span > < span class = "p" > :< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > . . .< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > - ./certs/:/certs< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > . . .< / span > < span class = "w" > < / span >
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< / code > < / pre > < / div > < / p >
< / li >
< li >
< p > While you're editing the < code > docker-compose.yml< / code > , add the configuration file:
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > services< / span > < span class = "p" > :< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "nt" > mailserver< / span > < span class = "p" > :< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "nt" > image< / span > < span class = "p" > :< / span > < span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > docker.io/mailserver/docker-mailserver:latest< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "nt" > volumes< / span > < span class = "p" > :< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > . . .< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > - ./config/dovecot/10-custom.conf:/etc/dovecot/conf.d/10-custom.conf< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > - ./certs/:/certs< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > . . .< / span > < span class = "w" > < / span >
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< / code > < / pre > < / div > < / p >
< / li >
< li >
< p > Start the container, monitor the logs for any errors, send yourself a message, and then confirm the file on disk is encrypted:
< div class = "highlight" > < pre > < span > < / span > < code > [root@ip-XXXXXXXXXX ~]# cat -A /mnt/efs-us-west-2/maildata/awesomesite.com/me/cur/1623989305.M6v<36> z<EFBFBD> @<40> <> m}<7D> <> ,<2C> <> 9<EFBFBD> <39> <EFBFBD> <EFBFBD> B*<2A> 247.us-west-2.compute.inE<6E> <45> \Ck*<2A> @7795,W=7947:2,
T<EFBFBD> 9<EFBFBD> 8t<EFBFBD> 6<EFBFBD> <EFBFBD> t<> <74> <EFBFBD> e<EFBFBD> W<EFBFBD> <57> S `<60> H<EFBFBD> <48> C<EFBFBD> ڤ <20> yeY<65> <59> XZ<58> <5A> ^<5E> d<EFBFBD> /<2F> <> +<2B> A
< / code > < / pre > < / div > < / p >
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< / li >
< / ol >
< p > This should be the minimum required for encryption of the mail while in storage.< / p >
< / article >
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< script id = "__config" type = "application/json" > { "base" : "../../.." , "features" : [ "navigation.tabs" , "navigation.top" , "navigation.expand" , "navigation.instant" , "content.code.annotate" ] , "search" : "../../../assets/javascripts/workers/search.b97dbffb.min.js" , "translations" : { "clipboard.copied" : "Copied to clipboard" , "clipboard.copy" : "Copy to clipboard" , "search.config.lang" : "en" , "search.config.pipeline" : "trimmer, stopWordFilter" , "search.config.separator" : "[\\s\\-]+" , "search.placeholder" : "Search" , "search.result.more.one" : "1 more on this page" , "search.result.more.other" : "# more on this page" , "search.result.none" : "No matching documents" , "search.result.one" : "1 matching document" , "search.result.other" : "# matching documents" , "search.result.placeholder" : "Type to start searching" , "search.result.term.missing" : "Missing" , "select.version.title" : "Select version" } , "version" : { "provider" : "mike" } } < / script >
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< script src = "../../../assets/javascripts/bundle.6c7ad80a.min.js" > < / script >
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< / body >
< / html >
