diff options
Diffstat (limited to 'lisp/net/gnutls.el')
| -rw-r--r-- | lisp/net/gnutls.el | 79 |
1 files changed, 69 insertions, 10 deletions
diff --git a/lisp/net/gnutls.el b/lisp/net/gnutls.el index 0929c31b6c4..8b662795665 100644 --- a/lisp/net/gnutls.el +++ b/lisp/net/gnutls.el @@ -25,7 +25,8 @@ ;;; Commentary: ;; This package provides language bindings for the GnuTLS library -;; using the corresponding core functions in gnutls.c. +;; using the corresponding core functions in gnutls.c. It should NOT +;; be used directly, only through open-protocol-stream. ;; Simple test: ;; @@ -59,26 +60,77 @@ Third arg is name of the host to connect to, or its IP address. Fourth arg SERVICE is name of the service desired, or an integer specifying a port number to connect to. +Usage example: + + \(with-temp-buffer + \(open-gnutls-stream \"tls\" + \(current-buffer) + \"your server goes here\" + \"imaps\")) + This is a very simple wrapper around `gnutls-negotiate'. See its documentation for the specific parameters you can use to open a GnuTLS connection, including specifying the credential type, trust and key files, and priority string." - (let ((proc (open-network-stream name buffer host service))) - (gnutls-negotiate proc 'gnutls-x509pki))) + (gnutls-negotiate (open-network-stream name buffer host service) + 'gnutls-x509pki + host)) + +(put 'gnutls-error + 'error-conditions + '(error gnutls-error)) +(put 'gnutls-error + 'error-message "GnuTLS error") (declare-function gnutls-boot "gnutls.c" (proc type proplist)) +(declare-function gnutls-errorp "gnutls.c" (error)) -(defun gnutls-negotiate (proc type &optional priority-string - trustfiles keyfiles) - "Negotiate a SSL/TLS connection. +(defun gnutls-negotiate (proc type hostname &optional priority-string + trustfiles keyfiles verify-flags + verify-error verify-hostname-error) + "Negotiate a SSL/TLS connection. Returns proc. Signals gnutls-error. TYPE is `gnutls-x509pki' (default) or `gnutls-anon'. Use nil for the default. PROC is a process returned by `open-network-stream'. +HOSTNAME is the remote hostname. It must be a valid string. PRIORITY-STRING is as per the GnuTLS docs, default is \"NORMAL\". TRUSTFILES is a list of CA bundles. -KEYFILES is a list of client keys." +KEYFILES is a list of client keys. + +When VERIFY-HOSTNAME-ERROR is not nil, an error will be raised +when the hostname does not match the presented certificate's host +name. The exact verification algorithm is a basic implementation +of the matching described in RFC2818 (HTTPS), which takes into +account wildcards, and the DNSName/IPAddress subject alternative +name PKIX extension. See GnuTLS' gnutls_x509_crt_check_hostname +for details. When VERIFY-HOSTNAME-ERROR is nil, only a warning +will be issued. + +When VERIFY-ERROR is not nil, an error will be raised when the +peer certificate verification fails as per GnuTLS' +gnutls_certificate_verify_peers2. Otherwise, only warnings will +be shown about the verification failure. + +VERIFY-FLAGS is a numeric OR of verification flags only for +`gnutls-x509pki' connections. See GnuTLS' x509.h for details; +here's a recent version of the list. + + GNUTLS_VERIFY_DISABLE_CA_SIGN = 1, + GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT = 2, + GNUTLS_VERIFY_DO_NOT_ALLOW_SAME = 4, + GNUTLS_VERIFY_ALLOW_ANY_X509_V1_CA_CRT = 8, + GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD2 = 16, + GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD5 = 32, + GNUTLS_VERIFY_DISABLE_TIME_CHECKS = 64, + GNUTLS_VERIFY_DISABLE_TRUSTED_TIME_CHECKS = 128, + GNUTLS_VERIFY_DO_NOT_ALLOW_X509_V1_CA_CRT = 256 + +It must be omitted, a number, or nil; if omitted or nil it +defaults to GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT." (let* ((type (or type 'gnutls-x509pki)) + (default-trustfile "/etc/ssl/certs/ca-certificates.crt") (trustfiles (or trustfiles - '("/etc/ssl/certs/ca-certificates.crt"))) + (when (file-exists-p default-trustfile) + (list default-trustfile)))) (priority-string (or priority-string (cond ((eq type 'gnutls-anon) @@ -86,19 +138,26 @@ KEYFILES is a list of client keys." ((eq type 'gnutls-x509pki) "NORMAL")))) (params `(:priority ,priority-string + :hostname ,hostname :loglevel ,gnutls-log-level :trustfiles ,trustfiles :keyfiles ,keyfiles + :verify-flags ,verify-flags + :verify-error ,verify-error + :verify-hostname-error ,verify-hostname-error :callbacks nil)) ret) (gnutls-message-maybe (setq ret (gnutls-boot proc type params)) - "boot: %s") + "boot: %s" params) + + (when (gnutls-errorp ret) + ;; This is a error from the underlying C code. + (signal 'gnutls-error (list proc ret))) proc)) -(declare-function gnutls-errorp "gnutls.c" (error)) (declare-function gnutls-error-string "gnutls.c" (error)) (defun gnutls-message-maybe (doit format &rest params) |