readlines and break apart based on letters

[rtilley]

Hi,

While trying to better understand security descriptors on Windows. I've
been examining text-based security descriptors. I have the security
descriptors on individual lines stored in a text file. I want to break
these lines apart based on owner, group, dacl and sacl. These areas are
demarcated by O: G: D: and S:

There are no spaces in the lines. How can I read each line so that each
area is broken out? I'd like output like this:

O: details
G: details or NONE
D: details or NONE
S: details or NONE

Here is an example SD:
O:owner_sidG:gr oup_sidD:dacl_f lags(string_ace 1)(string_ace2) ...(string_acen )S:sacl_flags(s tring_ace1)(str ing_ace2)...(st ring_acen)

I want to read this and break it apart like this:
O:owner_sid
G:group_sid
D:dacl_flags(st ring_ace1)(stri ng_ace2)...(str ing_acen)
S:sacl_flags(st ring_ace1)(stri ng_ace2)...(str ing_acen)

Any tips?
Brad

[rtilley]

Re: readlines and break apart based on letters

I got this to work... just FYI:

s =
'O:owner_sidG:g roup_sidD:dacl_ flags(string_ac e1)(string_ace2 )...(string_ace n)S:sacl_flags( string_ace1)(st ring_ace2)...(s tring_acen)'

SD = {}

S = str.split(s, 'S:')
SD['S_ACL'] = S[1]
D = str.split(S[0], 'D:')
SD['D_ACL'] = D[1]
G = str.split(D[0], 'G:')
SD['G_SID'] = G[1]
O = str.split(G[0], 'O:')
SD['O_SID'] = O[1]

for k,v in SD.iteritems():
print k,v

[Kent Johnson]

Re: readlines and break apart based on letters

rtilley wrote:[color=blue]
> Hi,
>
> While trying to better understand security descriptors on Windows. I've
> been examining text-based security descriptors. I have the security
> descriptors on individual lines stored in a text file. I want to break
> these lines apart based on owner, group, dacl and sacl. These areas are
> demarcated by O: G: D: and S:
>
> There are no spaces in the lines. How can I read each line so that each
> area is broken out? I'd like output like this:
>
> O: details
> G: details or NONE
> D: details or NONE
> S: details or NONE
>
> Here is an example SD:
> O:owner_sidG:gr oup_sidD:dacl_f lags(string_ace 1)(string_ace2) ...(string_acen )S:sacl_flags(s tring_ace1)(str ing_ace2)...(st ring_acen)[/color]

It's a pretty simple regex:[color=blue][color=green][color=darkred]
>>> import re
>>>[/color][/color][/color]
s='O:owner_sidG :group_sidD:dac l_flags(string_ ace1)(string_ac e2)...(string_a cen)S:sacl_flag s(string_ace1)( string_ace2)... (string_acen)'[color=blue][color=green][color=darkred]
>>>
>>> m=re.search(r'O :(.*?)G:(.*?)D: (.*?)S:(.*)', s)
>>> m.group(1,2,3,4 )[/color][/color][/color]
('owner_sid', 'group_sid',
'dacl_flags(str ing_ace1)(strin g_ace2)...(stri ng_acen)',
'sacl_flags(str ing_ace1)(strin g_ace2)...(stri ng_acen)')