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emacs/lisp/net/nsm.el

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Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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;;; nsm.el --- Network Security Manager
;; Copyright (C) 2014 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: encryption, security, network
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'cl-lib)
(defvar nsm-permanent-host-settings nil)
(defvar nsm-temporary-host-settings nil)
(defgroup nsm nil
"Network Security Manager"
:version "25.1"
:group 'comm)
* net/nsm.el (network-security-level): Change the default to `medium'.
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(defcustom network-security-level 'medium
Rename `nsm-security-level' to `network-security-level' * net/nsm.el (network-security-level): Rename from `nsm-security-level' and documented.
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"How secure the network should be.
If a potential problem with the security of the network
connection is found, the user is asked to give input into how the
connection should be handled.
The following values are possible:
`low': Absolutely no checks are performed.
`network-security-level' documentation simplification * lisp/net/nsm.el (network-security-level): Remove the detailed description, which was already outdated, and refer the users to the manual.
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`medium': This is the default level, should be reasonable for most usage.
`high': This warns about additional things that many people would
not find useful.
`paranoid': On this level, the user is queried for most new connections.
Rename `nsm-security-level' to `network-security-level' * net/nsm.el (network-security-level): Rename from `nsm-security-level' and documented.
2014-11-23 14:13:13 +00:00
`network-security-level' documentation simplification * lisp/net/nsm.el (network-security-level): Remove the detailed description, which was already outdated, and refer the users to the manual.
2014-12-08 19:06:50 +00:00
See the Emacs manual for a description of all things that are
checked and warned against."
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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:version "25.1"
:group 'nsm
:type '(choice (const :tag "Low" low)
(const :tag "Medium" medium)
(const :tag "High" high)
(const :tag "Paranoid" paranoid)))
(defcustom nsm-settings-file (expand-file-name "network-security.data"
user-emacs-directory)
"The file the security manager settings will be stored in."
:version "25.1"
:group 'nsm
:type 'file)
(defcustom nsm-save-host-names nil
"If non-nil, always save host names in the structures in `nsm-settings-file'.
By default, only hosts that have exceptions have their names
stored in plain text."
:version "25.1"
:group 'nsm
:type 'boolean)
(defvar nsm-noninteractive nil
"If non-nil, the connection is opened in a non-interactive context.
This means that no queries should be performed.")
(defun nsm-verify-connection (process host port &optional
save-fingerprint warn-unencrypted)
"Verify the security status of PROCESS that's connected to HOST:PORT.
If PROCESS is a gnutls connection, the certificate validity will
be examined. If it's a non-TLS connection, it may be compared
against previous connections. If the function determines that
there is something odd about the connection, the user will be
queried about what to do about it.
The process it returned if everything is OK, and otherwise, the
process will be deleted and nil is returned.
If SAVE-FINGERPRINT, always save the fingerprint of the
server (if the connection is a TLS connection). This is useful
to keep track of the TLS status of STARTTLS servers.
If WARN-UNENCRYPTED, query the user if the connection is
unencrypted."
Rename `nsm-security-level' to `network-security-level' * net/nsm.el (network-security-level): Rename from `nsm-security-level' and documented.
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(if (eq network-security-level 'low)
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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process
(let* ((status (gnutls-peer-status process))
(id (nsm-id host port))
(settings (nsm-host-settings id)))
(cond
((not (process-live-p process))
nil)
((not status)
;; This is a non-TLS connection.
(nsm-check-plain-connection process host port settings
warn-unencrypted))
(t
(let ((process
(nsm-check-tls-connection process host port status settings)))
(when (and process save-fingerprint
(null (nsm-host-settings id)))
(nsm-save-host host port status 'fingerprint 'always))
process))))))
(defun nsm-check-tls-connection (process host port status settings)
(nsm-check-protocol): Check for weak Diffie-Hellman prime bits. Fixes: debbugs:19153
2014-12-08 19:41:05 +00:00
(let ((process (nsm-check-certificate process host port status settings)))
(if (and process
(>= (nsm-level network-security-level) (nsm-level 'high)))
;; Do further protocol-level checks if the security is high.
(nsm-check-protocol process host port status settings)
process)))
(defun nsm-check-certificate (process host port status settings)
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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(let ((warnings (plist-get status :warnings)))
(cond
;; The certificate validated, but perhaps we want to do
;; certificate pinning.
((null warnings)
(cond
Rename `nsm-security-level' to `network-security-level' * net/nsm.el (network-security-level): Rename from `nsm-security-level' and documented.
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((< (nsm-level network-security-level) (nsm-level 'high))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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process)
;; The certificate is fine, but if we're paranoid, we might
;; want to check whether it's changed anyway.
Rename `nsm-security-level' to `network-security-level' * net/nsm.el (network-security-level): Rename from `nsm-security-level' and documented.
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((and (>= (nsm-level network-security-level) (nsm-level 'high))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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(not (nsm-fingerprint-ok-p host port status settings)))
(delete-process process)
nil)
;; We haven't seen this before, and we're paranoid.
Rename `nsm-security-level' to `network-security-level' * net/nsm.el (network-security-level): Rename from `nsm-security-level' and documented.
2014-11-23 14:13:13 +00:00
((and (eq network-security-level 'paranoid)
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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(null settings)
(not (nsm-new-fingerprint-ok-p host port status)))
(delete-process process)
nil)
Rename `nsm-security-level' to `network-security-level' * net/nsm.el (network-security-level): Rename from `nsm-security-level' and documented.
2014-11-23 14:13:13 +00:00
((>= (nsm-level network-security-level) (nsm-level 'high))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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;; Save the host fingerprint so that we can check it the
;; next time we connect.
(nsm-save-host host port status 'fingerprint 'always)
process)
(t
process)))
;; The certificate did not validate.
Rename `nsm-security-level' to `network-security-level' * net/nsm.el (network-security-level): Rename from `nsm-security-level' and documented.
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((not (equal network-security-level 'low))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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;; We always want to pin the certificate of invalid connections
;; to track man-in-the-middle or the like.
(if (not (nsm-fingerprint-ok-p host port status settings))
(progn
(delete-process process)
nil)
;; We have a warning, so query the user.
(if (and (not (nsm-warnings-ok-p status settings))
(not (nsm-query
host port status 'conditions
"The TLS connection to %s:%s is insecure\nfor the following reason%s:\n\n%s"
host port
(if (> (length warnings) 1)
"s" "")
net/nsm.el: Use `gnutls-peer-status-warning-describe'. * net/nsm.el (nsm-check-tls-connection, nsm-save-host) (nsm-warnings-ok-p): Use `gnutls-peer-status-warning-describe'.
2014-11-25 14:09:11 +00:00
(mapconcat #'gnutls-peer-status-warning-describe
warnings
"\n"))))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
2014-11-23 13:56:43 +00:00
(progn
(delete-process process)
nil)
process))))))
(nsm-check-protocol): Check for weak Diffie-Hellman prime bits. Fixes: debbugs:19153
2014-12-08 19:41:05 +00:00
(defun nsm-check-protocol (process host port status settings)
* lisp/net/nsm.el (nsm-check-protocol): Test for RC4 on `high'.
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(let ((prime-bits (plist-get status :diffie-hellman-prime-bits))
(encryption (format "%s-%s-%s"
(plist-get status :key-exchange)
(plist-get status :cipher)
(plist-get status :mac))))
(nsm-check-protocol): Check for weak Diffie-Hellman prime bits. Fixes: debbugs:19153
2014-12-08 19:41:05 +00:00
(cond
((and prime-bits
(< prime-bits 1024)
(not (memq :diffie-hellman-prime-bits
(plist-get settings :conditions)))
(not
(nsm-query
host port status :diffie-hellman-prime-bits
* lisp/net/nsm.el (nsm-check-protocol): Test for RC4 on `high'.
2014-12-08 21:23:41 +00:00
"The Diffie-Hellman prime bits (%s) used for this connection to\n%s:%s\nis less than what is considered safe (%s)."
(nsm-check-protocol): Check for weak Diffie-Hellman prime bits. Fixes: debbugs:19153
2014-12-08 19:41:05 +00:00
prime-bits host port 1024)))
(delete-process process)
nil)
* lisp/net/nsm.el (nsm-check-protocol): Test for RC4 on `high'.
2014-12-08 21:23:41 +00:00
((and (string-match "\\bRC4\\b" encryption)
(not (memq :rc4 (plist-get settings :conditions)))
(not
(nsm-query
host port status :rc4
"The connection to %s:%s uses the RC4 algorithm (%s), which is believed to be unsafe."
host port encryption))))
(nsm-check-protocol): Check for weak Diffie-Hellman prime bits. Fixes: debbugs:19153
2014-12-08 19:41:05 +00:00
(t
process))))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
2014-11-23 13:56:43 +00:00
(defun nsm-fingerprint (status)
(plist-get (plist-get status :certificate) :public-key-id))
(defun nsm-fingerprint-ok-p (host port status settings)
(let ((did-query nil))
(if (and settings
(not (eq (plist-get settings :fingerprint) :none))
(not (equal (nsm-fingerprint status)
(plist-get settings :fingerprint)))
(not
(setq did-query
(nsm-query
host port status 'fingerprint
"The fingerprint for the connection to %s:%s has changed from\n%s to\n%s"
host port
(plist-get settings :fingerprint)
(nsm-fingerprint status)))))
;; Not OK.
nil
(when did-query
;; Remove any exceptions that have been set on the previous
;; certificate.
(plist-put settings :conditions nil))
t)))
(defun nsm-new-fingerprint-ok-p (host port status)
(nsm-query
Better display for `paranoid' `network-security-level' * net/nsm.el (nsm-new-fingerprint-ok-p): Display the certificate when querying about new certificates.
2014-11-26 23:44:54 +00:00
host port status 'fingerprint
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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"The fingerprint for the connection to %s:%s is new:\n%s"
host port
(nsm-fingerprint status)))
(defun nsm-check-plain-connection (process host port settings warn-unencrypted)
;; If this connection used to be TLS, but is now plain, then it's
;; possible that we're being Man-In-The-Middled by a proxy that's
;; stripping out STARTTLS announcements.
(cond
((and (plist-get settings :fingerprint)
(not (eq (plist-get settings :fingerprint) :none))
(not
(nsm-query
host port nil 'conditions
"The connection to %s:%s used to be an encrypted\nconnection, but is now unencrypted. This might mean that there's a\nman-in-the-middle tapping this connection."
host port)))
(delete-process process)
nil)
((and warn-unencrypted
(not (memq :unencrypted (plist-get settings :conditions)))
(not (nsm-query
host port nil 'conditions
"The connection to %s:%s is unencrypted."
host port)))
(delete-process process)
nil)
(t
process)))
(defun nsm-query (host port status what message &rest args)
;; If there is no user to answer queries, then say `no' to everything.
(if (or noninteractive
nsm-noninteractive)
nil
(let ((response
(condition-case nil
(nsm-query-user message args (nsm-format-certificate status))
;; Make sure we manage to close the process if the user hits
;; `C-g'.
(quit 'no)
(error 'no))))
(if (eq response 'no)
nil
(nsm-save-host host port status what response)
t))))
(defun nsm-query-user (message args cert)
(let ((buffer (get-buffer-create "*Network Security Manager*")))
(with-help-window buffer
(with-current-buffer buffer
(erase-buffer)
(when (> (length cert) 0)
(insert cert "\n"))
(insert (apply 'format message args))))
(let ((responses '((?n . no)
(?s . session)
(?a . always)))
(prefix "")
response)
(while (not response)
(setq response
(cdr
(assq (downcase
(read-char
(concat prefix
"Continue connecting? (No, Session only, Always)")))
responses)))
(unless response
(ding)
(setq prefix "Invalid choice. ")))
(kill-buffer buffer)
;; If called from a callback, `read-char' will insert things
;; into the pending input. Clear that.
(clear-this-command-keys)
response)))
(defun nsm-save-host (host port status what permanency)
(let* ((id (nsm-id host port))
(saved
(list :id id
:fingerprint (or (nsm-fingerprint status)
;; Plain connection.
:none))))
(when (or (eq what 'conditions)
nsm-save-host-names)
(nconc saved (list :host (format "%s:%s" host port))))
;; We either want to save/update the fingerprint or the conditions
;; of the certificate/unencrypted connection.
(nsm-check-protocol): Check for weak Diffie-Hellman prime bits. Fixes: debbugs:19153
2014-12-08 19:41:05 +00:00
(cond
((eq what 'conditions)
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
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(nconc saved (list :host (format "%s:%s" host port)))
(cond
((not status)
(nsm-check-protocol): Check for weak Diffie-Hellman prime bits. Fixes: debbugs:19153
2014-12-08 19:41:05 +00:00
(nconc saved '(:conditions (:unencrypted))))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
2014-11-23 13:56:43 +00:00
((plist-get status :warnings)
(nconc saved
(nsm-check-protocol): Check for weak Diffie-Hellman prime bits. Fixes: debbugs:19153
2014-12-08 19:41:05 +00:00
(list :conditions (plist-get status :warnings))))))
((not (eq what 'fingerprint))
;; Store additional protocol settings.
(let ((settings (nsm-host-settings id)))
(when settings
(setq saved settings))
(if (plist-get saved :conditions)
(nconc (plist-get saved :conditions) (list what))
(nconc saved (list :conditions (list what)))))))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
2014-11-23 13:56:43 +00:00
(if (eq permanency 'always)
(progn
(nsm-remove-temporary-setting id)
(nsm-remove-permanent-setting id)
(push saved nsm-permanent-host-settings)
(nsm-write-settings))
(nsm-remove-temporary-setting id)
(push saved nsm-temporary-host-settings))))
(defun nsm-write-settings ()
(with-temp-file nsm-settings-file
(insert "(\n")
(dolist (setting nsm-permanent-host-settings)
(insert " ")
(prin1 setting (current-buffer))
(insert "\n"))
(insert ")\n")))
(defun nsm-read-settings ()
(setq nsm-permanent-host-settings
(with-temp-buffer
(insert-file-contents nsm-settings-file)
(goto-char (point-min))
(ignore-errors (read (current-buffer))))))
(defun nsm-id (host port)
(concat "sha1:" (sha1 (format "%s:%s" host port))))
(defun nsm-host-settings (id)
(when (and (not nsm-permanent-host-settings)
(file-exists-p nsm-settings-file))
(nsm-read-settings))
(let ((result nil))
(dolist (elem (append nsm-temporary-host-settings
nsm-permanent-host-settings))
(when (and (not result)
(equal (plist-get elem :id) id))
(setq result elem)))
result))
(defun nsm-warnings-ok-p (status settings)
Fix previous version of nsm-warnings-ok-p * net/nsm.el (nsm-format-certificate): Don't bug out on missing elements. (nsm-warnings-ok-p): The new version of this function always returned nil when everything was OK.
2014-11-25 15:30:36 +00:00
(let ((ok t)
(conditions (plist-get settings :conditions)))
(dolist (warning (plist-get status :warnings))
(unless (memq warning conditions)
(setq ok nil)))
ok))
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
2014-11-23 13:56:43 +00:00
(defun nsm-remove-permanent-setting (id)
(setq nsm-permanent-host-settings
(cl-delete-if
(lambda (elem)
(equal (plist-get elem :id) id))
nsm-permanent-host-settings)))
(defun nsm-remove-temporary-setting (id)
(setq nsm-temporary-host-settings
(cl-delete-if
(lambda (elem)
(equal (plist-get elem :id) id))
nsm-temporary-host-settings)))
(defun nsm-format-certificate (status)
(let ((cert (plist-get status :certificate)))
(when cert
(with-temp-buffer
(insert
"Certificate information\n"
"Issued by:"
(nsm-certificate-part (plist-get cert :issuer) "CN" t) "\n"
"Issued to:"
(or (nsm-certificate-part (plist-get cert :subject) "O")
(nsm-certificate-part (plist-get cert :subject) "OU" t))
"\n"
"Hostname:"
* net/nsm.el (nsm-format-certificate): Don't bug out on missing elements
2014-11-25 15:12:47 +00:00
(nsm-certificate-part (plist-get cert :subject) "CN" t) "\n")
(when (and (plist-get cert :public-key-algorithm)
(plist-get cert :signature-algorithm))
(insert
"Public key:" (plist-get cert :public-key-algorithm)
", signature: " (plist-get cert :signature-algorithm) "\n"))
(when (plist-get cert :certificate-security-level)
(insert
"Security level:"
(propertize (plist-get cert :certificate-security-level)
'face 'bold)
"\n"))
(insert
Implement a Network Security Manager * processes.texi (Network): Mention the new :warn-unless-encrypted parameter to `open-network-stream'. (Network): Mention the Network Security Manager. * net/nsm.el: New file that implements a Network Security Manager. * net/network-stream.el (open-network-stream): Add a new :warn-unless-encrypted parameter. (network-stream-open-plain): Allow warning unless encrypted. (network-stream-open-starttls): Call the Network Security Manager. (network-stream-open-tls): Ditto.
2014-11-23 13:56:43 +00:00
"Valid:From " (plist-get cert :valid-from)
" to " (plist-get cert :valid-to) "\n\n")
(goto-char (point-min))
(while (re-search-forward "^[^:]+:" nil t)
(insert (make-string (- 20 (current-column)) ? )))
(buffer-string)))))
(defun nsm-certificate-part (string part &optional full)
(let ((part (cadr (assoc part (nsm-parse-subject string)))))
(cond
(part part)
(full string)
(t nil))))
(defun nsm-parse-subject (string)
(with-temp-buffer
(insert string)
(goto-char (point-min))
(let ((start (point))
(result nil))
(while (not (eobp))
(push (replace-regexp-in-string
"[\\]\\(.\\)" "\\1"
(buffer-substring start
(if (re-search-forward "[^\\]," nil 'move)
(1- (point))
(point))))
result)
(setq start (point)))
(mapcar
(lambda (elem)
(let ((pos (cl-position ?= elem)))
(if pos
(list (substring elem 0 pos)
(substring elem (1+ pos)))
elem)))
(nreverse result)))))
(defun nsm-level (symbol)
"Return a numerical level for SYMBOL for easier comparison."
(cond
((eq symbol 'low) 0)
((eq symbol 'medium) 1)
((eq symbol 'high) 2)
(t 3)))
(provide 'nsm)
;;; nsm.el ends here
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