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Improve parsing

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To make the logic more resilient towards potential errors or future
output changes, not only consider the string index but also validate
it against a set of expected positions.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
This commit is contained in:
Georg Pfuetzenreuter 2024-09-16 16:14:25 +02:00
parent 3f58651401
commit 48b54bbd71
Signed by untrusted user: Georg
GPG Key ID: 1ED2F138E7E6FF57
1 changed files with 18 additions and 8 deletions
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pyacl/acl.py
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@ -43,22 +43,32 @@ def parse_permission(strpermission):
if len(strpermission) != MAX_PERMBITS:
return ValueError('Invalid permission')
permap = {
permap_i = {
0: 'read',
1: 'write',
2: 'execute',
}
permap_s = {
'r': 'read',
'w': 'write',
'e': 'execute',
}
outmap = DEFAULT_PERMISSIONS.copy()
for i, perm in permap.items():
permval = strpermission[i]
if permval in ['r', 'w', 'x']:
outmap[perm] = True
elif permval == '-':
outmap[perm] = False
for i, spval in enumerate(strpermission):
permval = permap_i[i]
if spval == '-':
outmap[permval] = False
else:
return ValueError('Invalid permission flag')
spermval = permap_s.get(spval)
if spermval and spermval in outmap:
if spermval != permval:
raise ValueError('Unexpected permission mismatch')
outmap[spermval] = True
else:
return ValueError('Invalid permission flag')
return outmap