(eval-and-compile
(autoload 'format-spec "format-spec")
(autoload 'format-spec-make "format-spec"))
(defgroup tls nil
"Transport Layer Security (TLS) parameters."
:group 'comm)
(defcustom tls-program '("gnutls-cli -p %p %h"
"gnutls-cli -p %p %h --protocols ssl3"
"openssl s_client -connect %h:%p -no_ssl2")
"List of strings containing commands to start TLS stream to a host.
Each entry in the list is tried until a connection is successful.
%h is replaced with server hostname, %p with port to connect to.
The program should read input on stdin and write output to
stdout. Also see `tls-success' for what the program should output
after successful negotiation."
:type '(repeat string)
:version "22.1"
:group 'tls)
(defcustom tls-process-connection-type nil
"*Value for `process-connection-type' to use when starting TLS process."
:version "22.1"
:type 'boolean
:group 'tls)
(defcustom tls-success "- Handshake was completed\\|SSL handshake has read "
"*Regular expression indicating completed TLS handshakes.
The default is what GNUTLS's \"gnutls-cli\" or OpenSSL's
\"openssl s_client\" outputs."
:version "22.1"
:type 'regexp
:group 'tls)
(defcustom tls-certtool-program (executable-find "certtool")
"Name of GnuTLS certtool.
Used by `tls-certificate-information'."
:version "22.1"
:type 'string
:group 'tls)
(defun tls-certificate-information (der)
"Parse X.509 certificate in DER format into an assoc list."
(let ((certificate (concat "-----BEGIN CERTIFICATE-----\n"
(base64-encode-string der)
"\n-----END CERTIFICATE-----\n"))
(exit-code 0))
(with-current-buffer (get-buffer-create " *certtool*")
(erase-buffer)
(insert certificate)
(setq exit-code (condition-case ()
(call-process-region (point-min) (point-max)
tls-certtool-program
t (list (current-buffer) nil) t
"--certificate-info")
(error -1)))
(if (/= exit-code 0)
nil
(let ((vals nil))
(goto-char (point-min))
(while (re-search-forward "^\\([^:]+\\): \\(.*\\)" nil t)
(push (cons (match-string 1) (match-string 2)) vals))
(nreverse vals))))))
(defun open-tls-stream (name buffer host port)
"Open a TLS connection for a port to a host.
Returns a subprocess-object to represent the connection.
Input and output work as for subprocesses; `delete-process' closes it.
Args are NAME BUFFER HOST PORT.
NAME is name for process. It is modified if necessary to make it unique.
BUFFER is the buffer (or buffer-name) to associate with the process.
Process output goes at end of that buffer, unless you specify
an output stream or filter function to handle the output.
BUFFER may be also nil, meaning that this process is not associated
with any buffer
Third arg is name of the host to connect to, or its IP address.
Fourth arg PORT is an integer specifying a port to connect to."
(let ((cmds tls-program)
(use-temp-buffer (null buffer))
process cmd done)
(if use-temp-buffer
(setq buffer (generate-new-buffer " TLS")))
(message "Opening TLS connection to `%s'..." host)
(while (and (not done) (setq cmd (pop cmds)))
(message "Opening TLS connection with `%s'..." cmd)
(let ((process-connection-type tls-process-connection-type)
response)
(setq process (start-process
name buffer shell-file-name shell-command-switch
(format-spec
cmd
(format-spec-make
?h host
?p (if (integerp port)
(int-to-string port)
port)))))
(while (and process
(memq (process-status process) '(open run))
(save-excursion
(set-buffer buffer) (goto-char (point-min))
(not (setq done (re-search-forward tls-success nil t)))))
(unless (accept-process-output process 1)
(sit-for 1)))
(message "Opening TLS connection with `%s'...%s" cmd
(if done "done" "failed"))
(if done
(setq done process)
(delete-process process))))
(message "Opening TLS connection to `%s'...%s"
host (if done "done" "failed"))
(when use-temp-buffer
(if done (set-process-buffer process nil))
(kill-buffer buffer))
done))
(provide 'tls)