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-rw-r--r--contrib/vim/noplaintext.vim46
-rw-r--r--contrib/vim/redact_pass.txt41
-rw-r--r--contrib/vim/redact_pass.vim80
3 files changed, 121 insertions, 46 deletions
diff --git a/contrib/vim/noplaintext.vim b/contrib/vim/noplaintext.vim
deleted file mode 100644
index 9493194..0000000
--- a/contrib/vim/noplaintext.vim
+++ /dev/null
@@ -1,46 +0,0 @@
-"
-" Prevent various Vim features from keeping the contents of pass(1) password
-" files (or any other purely temporary files) in plaintext on the system.
-"
-" Either append this to the end of your .vimrc, or install it as a plugin with
-" a plugin manager like Tim Pope's Pathogen.
-"
-" Author: Tom Ryder <tom@sanctum.geek.nz>
-"
-
-" Don't backup files in temp directories or shm
-if exists('&backupskip')
- set backupskip+=/tmp/*,$TMPDIR/*,$TMP/*,$TEMP/*,*/shm/*
-endif
-
-" Don't keep swap files in temp directories or shm
-if has('autocmd')
- augroup swapskip
- autocmd!
- silent! autocmd BufNewFile,BufReadPre
- \ /tmp/*,$TMPDIR/*,$TMP/*,$TEMP/*,*/shm/*
- \ setlocal noswapfile
- augroup END
-endif
-
-" Don't keep undo files in temp directories or shm
-if has('persistent_undo') && has('autocmd')
- augroup undoskip
- autocmd!
- silent! autocmd BufWritePre
- \ /tmp/*,$TMPDIR/*,$TMP/*,$TEMP/*,*/shm/*
- \ setlocal noundofile
- augroup END
-endif
-
-" Don't keep viminfo for files in temp directories or shm
-if has('viminfo')
- if has('autocmd')
- augroup viminfoskip
- autocmd!
- silent! autocmd BufNewFile,BufReadPre
- \ /tmp/*,$TMPDIR/*,$TMP/*,$TEMP/*,*/shm/*
- \ setlocal viminfo=
- augroup END
- endif
-endif
diff --git a/contrib/vim/redact_pass.txt b/contrib/vim/redact_pass.txt
new file mode 100644
index 0000000..86d8a25
--- /dev/null
+++ b/contrib/vim/redact_pass.txt
@@ -0,0 +1,41 @@
+*redact_pass.txt* For Vim version 6.0 Last change: 2018 June 10
+
+DESCRIPTION *redact_pass*
+
+This plugin switches off the 'viminfo', 'backup', 'writebackup', 'swapfile',
+and 'undofile' options globally when editing a password in `pass(1)`.
+
+This is to prevent anyone being able to extract passwords from your Vim cache
+files in the event of a compromise.
+
+You should test this after installed to ensure you see this message is printed
+whenever you `pass edit`:
+
+> Editing password file--disabled leaky options!
+
+REQUIREMENTS *redact_pass-requirements*
+
+This plugin is only available if 'compatible' is not set. It also requires the
+|+autocmd| feature.
+
+IMPLEMENTATION *redact_pass-implementation*
+
+The options are disabled globally rather than attempting to set them local to
+the buffer only, which was the flawed approach of previous versions. This is
+mostly because of the 'viminfo' option; it's global, and there's no meaningful
+way to exclude information from the sensitive buffer from appearing in it.
+
+Because the typical use case for editing a password file in Vim is that you
+load and change a single short document, and then quit, it's more sensible to
+just turn the relevant options off completely, and makes what the plugin is
+doing more reliable and straightforward to understand.
+
+AUTHOR *redact_pass-author*
+
+Written and maintained by Tom Ryder <tom@sanctum.geek.nz>.
+
+LICENSE *redact_pass-license*
+
+Licensed for distribution under the same terms as the pass(1) project.
+
+ vim:tw=78:ts=8:ft=help:norl:
diff --git a/contrib/vim/redact_pass.vim b/contrib/vim/redact_pass.vim
new file mode 100644
index 0000000..14919bb
--- /dev/null
+++ b/contrib/vim/redact_pass.vim
@@ -0,0 +1,80 @@
+"
+" redact_pass.vim: Switch off the 'viminfo', 'backup', 'writebackup',
+" 'swapfile', and 'undofile' globally when editing a password in pass(1).
+"
+" This is to prevent anyone being able to extract passwords from your Vim
+" cache files in the event of a compromise.
+"
+" Author: Tom Ryder <tom@sanctum.geek.nz>
+" License: Same as Vim itself
+"
+if exists('g:loaded_redact_pass') || &compatible
+ finish
+endif
+if !has('autocmd')
+ finish
+endif
+let g:loaded_redact_pass = 1
+
+" Pattern to match for the portion of the path after the temporary dir,
+" starting with the leading slash
+let s:pattern = '\m\C/pass\.[^/]\+/[^/]\+\.txt$'
+
+" Check whether the given dir name is not an empty string, whether the first
+" file in the argument list is within the named dir, and that the whole path
+" matches the above pattern immediately after that dir name
+function! s:PassPath(root)
+
+ " Check we actually got a value, i.e. this wasn't an empty environment
+ " variable
+ if !strlen(a:root)
+ return 0
+ endif
+
+ " Full resolved path to the root dir with no trailing slashes
+ let l:root = fnamemodify(a:root, ':p:h')
+
+ " Full resolved path to the first file in the arg list
+ let l:path = fnamemodify(argv(0), ':p')
+
+ " Check the string all match and at the expected points
+ return stridx(l:path, l:root) == 0
+ \ && strlen(l:root) == match(l:path, s:pattern)
+
+endfunction
+
+" Check whether we should set redacting options or not
+function! s:CheckArgsRedact()
+
+ " Short-circuit unless we're editing just one file and it looks like a path
+ " in one of the three expected directories; we're trying hard to make sure
+ " this really is a password file and we're not messing with the user's
+ " precious settings unnecessarily
+ if argc() != 1
+ \ || !s:PassPath('/dev/shm')
+ \ && !s:PassPath($TMPDIR)
+ \ && !s:PassPath('/tmp')
+ return
+ endif
+
+ " Disable all the leaky options globally
+ set nobackup
+ set nowritebackup
+ set noswapfile
+ set viminfo=
+ if has('persistent_undo')
+ set noundofile
+ endif
+
+ " Tell the user what we're doing so they know this worked, via a message and
+ " a global variable they can check
+ echomsg 'Editing password file--disabled leaky options!'
+ let g:redact_pass_redacted = 1
+
+endfunction
+
+" Auto function loads only when Vim starts up
+augroup redact_pass
+ autocmd!
+ autocmd VimEnter * call s:CheckArgsRedact()
+augroup END