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stunnel.conf-sample
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; Sample stunnel configuration file for Unix by Michal Trojnara 1998-2023 ; Some options used here may be inadequate for your particular configuration ; This sample file does *not* represent stunnel.conf defaults ; Please consult the manual for detailed description of available options ; ************************************************************************** ; * Global options * ; ************************************************************************** ; It is recommended to drop root privileges if stunnel is started by root ;setuid = nobody ;setgid = nobody ; PID file is created inside the chroot jail (if enabled) ;pid = /var/run/stunnel.pid ; Debugging stuff (may be useful for troubleshooting) ;foreground = yes ;debug = info ;output = /var/log/stunnel.log ; Enable FIPS 140-2 mode if needed for compliance ;fips = yes ; The pkcs11 engine allows for authentication with cryptographic ; keys isolated in a hardware or software token ; MODULE_PATH specifies the path to the pkcs11 module shared library, ; e.g. softhsm2.dll or opensc-pkcs11.so ; Each section using this feature also needs the "engineId = pkcs11" option ;engine = pkcs11 ;engineCtrl = MODULE_PATH:/usr/lib/softhsm/libsofthsm2.so ;engineCtrl = PIN:1234 ; ************************************************************************** ; * Service defaults may also be specified in individual service sections * ; ************************************************************************** ; Enable support for the insecure SSLv3 protocol ;options = -NO_SSLv3 ; These options provide additional security at some performance degradation ;options = SINGLE_ECDH_USE ;options = SINGLE_DH_USE ; ************************************************************************** ; * Include all configuration file fragments from the specified folder * ; ************************************************************************** ;include = /etc/stunnel/conf.d ; ************************************************************************** ; * Service definitions (remove all services for inetd mode) * ; ************************************************************************** ; ***************************************** Example TLS client mode services ; The following examples use /etc/ssl/certs, which is the common location ; of a hashed directory containing trusted CA certificates. This is not ; a hardcoded path of the stunnel package, as it is not related to the ; stunnel configuration in /etc/stunnel/. [gmail-pop3] client = yes accept = 127.0.0.1:110 connect = pop.gmail.com:995 verifyChain = yes CApath = /etc/ssl/certs checkHost = pop.gmail.com OCSPaia = yes [gmail-imap] client = yes accept = 127.0.0.1:143 connect = imap.gmail.com:993 verifyChain = yes CApath = /etc/ssl/certs checkHost = imap.gmail.com OCSPaia = yes [gmail-smtp] client = yes accept = 127.0.0.1:25 connect = smtp.gmail.com:465 verifyChain = yes CApath = /etc/ssl/certs checkHost = smtp.gmail.com OCSPaia = yes ; Encrypted HTTP proxy authenticated with a client certificate ; located in a cryptographic token ;[example-pkcs11] ;client = yes ;accept = 127.0.0.1:8080 ;connect = example.com:8443 ;engineId = pkcs11 ;cert = pkcs11:token=MyToken;object=MyCert ;key = pkcs11:token=MyToken;object=MyKey ; ***************************************** Example TLS server mode services ;[pop3s] ;accept = 995 ;connect = 110 ;cert = /etc/stunnel/stunnel.pem ;[imaps] ;accept = 993 ;connect = 143 ;cert = /etc/stunnel/stunnel.pem ; Either only expose this service to trusted networks, or require ; authentication when relaying emails originated from loopback. ; Otherwise the following configuration creates an open relay. ;[ssmtp] ;accept = 465 ;connect = 25 ;cert = /etc/stunnel/stunnel.pem ; TLS front-end to a web server ;[https] ;accept = 443 ;connect = 80 ;cert = /etc/stunnel/stunnel.pem ; "TIMEOUTclose = 0" is a workaround for a design flaw in Microsoft SChannel ; Microsoft implementations do not use TLS close-notify alert and thus they ; are vulnerable to truncation attacks ;TIMEOUTclose = 0 ; Remote shell protected with PSK-authenticated TLS ; Create "/etc/stunnel/secrets.txt" containing IDENTITY:KEY pairs ;[shell] ;accept = 1337 ;exec = /bin/sh ;execArgs = sh -i ;PSKsecrets = /etc/stunnel/secrets.txt ; Non-standard MySQL-over-TLS encapsulation connecting the Unix socket ;[mysql] ;cert = /etc/stunnel/stunnel.pem ;accept = 3307 ;connect = /run/mysqld/mysqld.sock ; vim:ft=dosini