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The guidelines in this file are the ideals; it's better to send a
not-fully-following-guidelines patch than no patch at all, though.  We
can always polish it up.

Mailing list

The D-BUS mailing list is message-bus-list@freedesktop.org; discussion
of patches, etc. should go there.


Most of D-BUS is security sensitive.  Guidelines related to that:

 - avoid memcpy(), sprintf(), strlen(), snprintf, strlcat(),
   strstr(), strtok(), or any of this stuff. Use DBusString. 
   If DBusString doesn't have the feature you need, add it 
   to DBusString. 

   There are some exceptions, for example
   if your strings are just used to index a hash table 
   and you don't do any parsing/modification of them, perhaps
   DBusString is wasteful and wouldn't help much. But definitely 
   if you're doing any parsing, reallocation, etc. use DBusString.

 - do not include system headers outside of dbus-memory.c, 
   dbus-sysdeps.c, and other places where they are already 
   included. This gives us one place to audit all external 
   dependencies on features in libc, etc.

 - do not use libc features that are "complicated" 
   and may contain security holes. For example, you probably shouldn't
   try to use regcomp() to compile an untrusted regular expression.
   Regular expressions are just too complicated, and there are many 
   different libc's out there.

 - we need to design the message bus daemon (and any similar features)
   to use limited privileges, run in a chroot jail, and so on.

http://vsftpd.beasts.org/ has other good security suggestions.

Coding Style

 - The C library uses GNU coding conventions, with GLib-like
   extensions (e.g. lining up function arguments). The
   Qt wrapper uses KDE coding conventions.

 - Write docs for all non-static functions and structs and so on. try
   "doxygen Doxyfile" prior to commit and be sure there are no
   warnings printed.

 - All external interfaces (network protocols, file formats, etc.)
   should have documented specifications sufficient to allow an
   alternative implementation to be written. Our implementation should
   be strict about specification compliance (should not for example
   heuristically parse a file and accept not-well-formed
   data). Avoiding heuristics is also important for security reasons;
   if it looks funny, ignore it (or exit, or disconnect).