[patch] alpha_strcpy for HEAD

Andrew Bartlett abartlet at pcug.org.au
Fri Jan 18 01:22:02 GMT 2002

Ihar Viarheichyk wrote:
> On Fri, Jan 18, 2002 at 09:09:06AM +1100, Andrew Bartlett wrote:
> > What problem is this patch intended to solve?
> >
> > See my recent samba-technical post on my I think that this is a bad idea
> > - the problem should be solved by certifying certain code-paths as
> > 'stange char safe' rather than changing the definition of 'strange
> > char'.
> Current version of alpha_strcpy does not allow use non-ascii usernames,
> it replaces them with "___". I don't see better way to solve this
> problem than extend 'valid symbols' definition, as usernames are used in
> %U substitutions (so this is surely not 'strange char safe' code path).
> This patch just allow consider _all_ letters (including multibute ones
> in e.g. UTF-8) as valid symbols.

Can you tell me that all letters won't include \ ' / " * @ ! .. within
that multibyte sequence?

Can you tell me that they wont include a byte of value 255?  That it
won't inlude *any shell metacharacter*?

The better way to do this is to allow basic processing of 'unsafe'
usernames, at least to the DC and to the username map.  From this point
we can take the usernames from a 'safe' source, that being what is
recorded in the system.  These are no longer 'tainted' and can be used
for %u variable expansion without an issue.  %U expansion could then
occour on the munged version only.

Andrew Bartlett

Andrew Bartlett                                 abartlet at pcug.org.au
Manager, Authentication Subsystems, Samba Team  abartlet at samba.org
Student Network Administrator, Hawker College   abartlet at hawkerc.net
http://samba.org     http://build.samba.org     http://hawkerc.net

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