1 The guidelines in this file are the ideals; it's better to send a
2 not-fully-following-guidelines patch than no patch at all, though. We
3 can always polish it up.
8 The D-BUS mailing list is message-bus-list@freedesktop.org; discussion
9 of patches, etc. should go there.
14 Most of D-BUS is security sensitive. Guidelines related to that:
16 - avoid memcpy(), sprintf(), strlen(), snprintf, strlcat(),
17 strstr(), strtok(), or any of this stuff. Use DBusString.
18 If DBusString doesn't have the feature you need, add it
21 There are some exceptions, for example
22 if your strings are just used to index a hash table
23 and you don't do any parsing/modification of them, perhaps
24 DBusString is wasteful and wouldn't help much. But definitely
25 if you're doing any parsing, reallocation, etc. use DBusString.
27 - do not include system headers outside of dbus-memory.c,
28 dbus-sysdeps.c, and other places where they are already
29 included. This gives us one place to audit all external
30 dependencies on features in libc, etc.
32 - do not use libc features that are "complicated"
33 and may contain security holes. For example, you probably shouldn't
34 try to use regcomp() to compile an untrusted regular expression.
35 Regular expressions are just too complicated, and there are many
36 different libc's out there.
38 - we need to design the message bus daemon (and any similar features)
39 to use limited privileges, run in a chroot jail, and so on.
41 http://vsftpd.beasts.org/ has other good security suggestions.
46 - The C library uses GNU coding conventions, with GLib-like
47 extensions (e.g. lining up function arguments). The
48 Qt wrapper uses KDE coding conventions.
50 - Write docs for all non-static functions and structs and so on. try
51 "doxygen Doxyfile" prior to commit and be sure there are no
54 - All external interfaces (network protocols, file formats, etc.)
55 should have documented specifications sufficient to allow an
56 alternative implementation to be written. Our implementation should
57 be strict about specification compliance (should not for example
58 heuristically parse a file and accept not-well-formed
59 data). Avoiding heuristics is also important for security reasons;
60 if it looks funny, ignore it (or exit, or disconnect).