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Langue: en

Version: March 2010 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)


gsasl - SASL library command line interface


gsasl [OPTIONS]... [HOST [PORT]]...


GNU SASL 1.4.4

Authenticate user to a server using Simple Authentication and Security Layer. Currently IMAP and SMTP servers are supported. This is a command line interface for the GNU SASL library.

-h, --help
Print help and exit
-V, --version
Print version and exit


-c, --client
Act as client. (default=on)
-s, --server
Act as server. (default=off)
Write name of supported client mechanisms separated by space to stdout. (default=off)
Write name of supported server mechanisms separated by space to stdout. (default=off)

Network options:

Connect to TCP server and negotiate on stream instead of stdin/stdout. PORT is the protocol service, or an integer denoting the port, and defaults to 143 (imap) if not specified. Also sets the --hostname default.

Generic options:

-d, --application-data
After authentication, read data from stdin and run it through the mechanism's security layer and print it base64 encoded to stdout. The default is to terminate after authentication.
Use a IMAP-like logon procedure (client only). Also sets the --service default to 'imap'. (default=off)
Use a SMTP-like logon procedure (client only). Also sets the --service default to 'smtp'. (default=off)
-m, --mechanism=STRING
Mechanism to use.
Disallow client to send data first (client only). (default=off)

SASL mechanism options (they are prompted for when required):

-n, --anonymous-token=STRING
Token for anonymous authentication, usually mail address (ANONYMOUS only).
-a, --authentication-id=STRING
Identity of credential owner.
-z, --authorization-id=STRING Identity to request service for.
-p, --password=STRING
Password for authentication (insecure for non-testing purposes).
-r, --realm=STRING
Realm. Defaults to hostname.
-x, --maxbuf=NUMBER
Indicate maximum buffer size (DIGEST-MD5 only).
Passcode for authentication (SECURID only).
Set the requested service name (should be a registered GSSAPI host based service name).
Set the name of the server with the requested service.
Set the generic server name in case of a replicated server (DIGEST-MD5 only).
Validate CRAM-MD5 challenge and response
Disable cleartext validate hook, forcing server
to prompt for password.
How application payload will be protected.
'qop-auth' means no protection, 'qop-int' means integrity protection, 'qop-conf' means integrity and confidentialiy protection. Currently only used by DIGEST-MD5, where the default is 'qop-int'.

STARTTLS options:

Force use of STARTTLS. The default is to use STARTTLS when available. (default=off)
Unconditionally disable STARTTLS. (default=off)
File containing one or more X.509 Certificate Authorities certificates in PEM format, used to verify the certificate received from the server. If not specified, no verification of the remote server certificate will be done.
File containing client X.509 certificate in PEM format. Used together with --x509-key-file to specify the certificate/key pair.
Private key for the client X.509 certificate in PEM format. Used together with --x509-key-file to specify the certificate/key pair.
Cipher priority string.

Other options:

Produce verbose output. (default=off)
Don't produce any diagnostic output. (default=off)


Written by Simon Josefsson.


Report bugs to:
GNU SASL home page: <>
General help using GNU software: <> Copyright © 2010 Simon Josefsson. License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


The full documentation for gsasl is maintained as a Texinfo manual. If the info and gsasl programs are properly installed at your site, the command
info gsasl

should give you access to the complete manual.

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