rsync-ssl - a helper script for connecting to an ssl rsync daemon
rsync-ssl [--type=SSL_TYPE] RSYNC_ARGS
The online version of this man page (that includes cross-linking of topics) is available at https://download.samba.org/pub/rsync/rsync-ssl.1.
The rsync-ssl script helps you to run an rsync copy to/from an rsync daemon that requires ssl connections.
The script requires that you specify an rsync-daemon arg in the style of either
hostname:: (with 2 colons) or
rsync://hostname/. The default port used for
connecting is 874 (one higher than the normal 873) unless overridden in the
environment. You can specify an overriding port via
--port or by including
it in the normal spot in the URL format, though both of those require your
rsync version to be at least 3.2.0.
If the first arg is a
--type=SSL_TYPE option, the script will only use
that particular program to open an ssl connection instead of trying to find an
openssl or stunnel executable via a simple heuristic (assuming that the
RSYNC_SSL_TYPE environment variable is not set as well -- see below). This
option must specify one of
stunnel. The equal sign is
required for this particular option.
All the other options are passed through to the rsync command, so consult the rsync(1) manpage for more information on how it works.
The ssl helper scripts are affected by the following environment variables:
Specifies the program type that should be used to open the ssl connection.
It must be one of
overrides this, when specified.
If specified, the value is the port number that is used as the default when the user does not specify a port in their rsync command. When not specified, the default port number is 874. (Note that older rsync versions (prior to 3.2.0) did not communicate an overriding port number value to the helper script.)
If specified, the value is a filename that contains a certificate to use for the connection.
If specified, the value is a filename that contains a key for the provided certificate to use for the connection.
If specified, the value is a filename that contains a certificate authority certificate that is used to validate the connection.
Specifies the openssl executable to run when the connection type is set to openssl. If unspecified, the $PATH is searched for "openssl".
Specifies the gnutls-cli executable to run when the connection type is set to gnutls. If unspecified, the $PATH is searched for "gnutls-cli".
Specifies the stunnel executable to run when the connection type is set to stunnel. If unspecified, the $PATH is searched first for "stunnel4" and then for "stunnel".
rsync-ssl -aiv example.com::mod/ dest
rsync-ssl --type=openssl -aiv example.com::mod/ dest
rsync-ssl -aiv --port 9874 example.com::mod/ dest
rsync-ssl -aiv rsync://example.com:9874/mod/ dest
Note that using an stunnel connection requires at least version 4 of stunnel, which should be the case on modern systems. Also, it does not verify a connection against the CA certificate collection, so it only encrypts the connection without any cert validation unless you have specified the certificate environment options.
This script also supports a
--type=gnutls option, but at the time of this
release the gnutls-cli command was dropping output, making it unusable. If
that bug has been fixed in your version, feel free to put gnutls into an
exported RSYNC_SSL_TYPE environment variable to make its use the default.
Please report bugs! See the web site at https://rsync.samba.org/.
This man page is current for version 3.2.4pre3 of rsync.
Rsync is distributed under the GNU General Public License. See the file COPYING for details.
A web site is available at https://rsync.samba.org/. The site includes an FAQ-O-Matic which may cover questions unanswered by this manual page.
This manpage was written by Wayne Davison.
Mailing lists for support and development are available at https://lists.samba.org/.
18 Jan 2022