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minor code refactoring in preparation of ticket #75

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This commit is contained in:
Bernardo Damele 2012-07-12 01:12:30 +01:00
parent caeddf6822
commit a5924739f6
2 changed files with 37 additions and 34 deletions
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35
lib/core/agent.py
View File

@ -763,6 +763,41 @@ class Agent:
return limitedQuery
def forgeQueryOutputLength(self, expression):
lengthQuery = queries[Backend.getIdentifiedDbms()].length.query
select = re.search("\ASELECT\s+", expression, re.I)
selectTopExpr = re.search("\ASELECT\s+TOP\s+[\d]+\s+(.+?)\s+FROM", expression, re.I)
selectDistinctExpr = re.search("\ASELECT\s+DISTINCT\((.+?)\)\s+FROM", expression, re.I)
selectFromExpr = re.search("\ASELECT\s+(.+?)\s+FROM", expression, re.I)
selectExpr = re.search("\ASELECT\s+(.+)$", expression, re.I)
if any((selectTopExpr, selectDistinctExpr, selectFromExpr, selectExpr)):
if selectTopExpr:
query = selectTopExpr.group(1)
elif selectDistinctExpr:
query = selectDistinctExpr.group(1)
elif selectFromExpr:
query = selectFromExpr.group(1)
elif selectExpr:
query = selectExpr.group(1)
else:
query = expression
if ( select and re.search("\A(COUNT|LTRIM)\(", query, re.I) ) or len(query) <= 1:
return query
if selectDistinctExpr:
lengthExpr = "SELECT %s FROM (%s)" % (lengthQuery % query, expression)
if Backend.getIdentifiedDbms() in ( DBMS.MYSQL, DBMS.PGSQL ):
lengthExpr += " AS %s" % randomStr(lowercase=True)
elif select:
lengthExpr = expression.replace(query, lengthQuery % query, 1)
else:
lengthExpr = lengthQuery % expression
return unescaper.unescape(lengthExpr)
def forgeCaseStatement(self, expression):
"""
Take in input a query string and return its CASE statement query

36
lib/techniques/blind/inference.py
View File

@ -553,43 +553,11 @@ def queryOutputLength(expression, payload):
Returns the query output length.
"""
lengthQuery = queries[Backend.getIdentifiedDbms()].length.query
select = re.search("\ASELECT\s+", expression, re.I)
selectTopExpr = re.search("\ASELECT\s+TOP\s+[\d]+\s+(.+?)\s+FROM", expression, re.I)
selectDistinctExpr = re.search("\ASELECT\s+DISTINCT\((.+?)\)\s+FROM", expression, re.I)
selectFromExpr = re.search("\ASELECT\s+(.+?)\s+FROM", expression, re.I)
selectExpr = re.search("\ASELECT\s+(.+)$", expression, re.I)
if any((selectTopExpr, selectDistinctExpr, selectFromExpr, selectExpr)):
if selectTopExpr:
query = selectTopExpr.group(1)
elif selectDistinctExpr:
query = selectDistinctExpr.group(1)
elif selectFromExpr:
query = selectFromExpr.group(1)
elif selectExpr:
query = selectExpr.group(1)
else:
query = expression
if ( select and re.search("\A(COUNT|LTRIM)\(", query, re.I) ) or len(query) <= 1:
return None, None, None
if selectDistinctExpr:
lengthExpr = "SELECT %s FROM (%s)" % (lengthQuery % query, expression)
if Backend.getIdentifiedDbms() in ( DBMS.MYSQL, DBMS.PGSQL ):
lengthExpr += " AS %s" % randomStr(lowercase=True)
elif select:
lengthExpr = expression.replace(query, lengthQuery % query, 1)
else:
lengthExpr = lengthQuery % expression
infoMsg = "retrieving the length of query output"
logger.info(infoMsg)
lengthExprUnescaped = agent.forgeQueryOutputLength(expression)
start = time.time()
lengthExprUnescaped = unescaper.unescape(lengthExpr)
count, length = bisection(payload, lengthExprUnescaped, charsetType=CHARSET_TYPE.DIGITS)
debugMsg = "performed %d queries in %d seconds" % (count, calculateDeltaSeconds(start))
@ -598,4 +566,4 @@ def queryOutputLength(expression, payload):
if length == " ":
length = 0
return count, length, query
return length