1 files changed, 80 insertions, 0 deletions
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