Implementation for an Issue #70

lib/controller/checks.py

@@ -359,7 +359,7 @@ def checkSqlInjection(place, parameter, value):
 
                                     injectable = True
 
-                            if not injectable and not conf.string and kb.pageStable:
+                            if not injectable and not any((conf.string, conf.notString, conf.regexp)) and kb.pageStable:
                                 trueSet = set(extractTextTagContent(truePage))
                                 falseSet = set(extractTextTagContent(falsePage))
                                 candidates = filter(None, (_.strip() if _.strip() in (kb.pageTemplate or "") and _.strip() not in falsePage else None for _ in (trueSet - falseSet)))
@@ -499,6 +499,7 @@ def checkSqlInjection(place, parameter, value):
                         injection.conf.textOnly = conf.textOnly
                         injection.conf.titles = conf.titles
                         injection.conf.string = conf.string
+                        injection.conf.notString = conf.notString
                         injection.conf.regexp = conf.regexp
                         injection.conf.optimize = conf.optimize
 

lib/controller/controller.py

@@ -357,7 +357,7 @@ def start():
             if (len(kb.injections) == 0 or (len(kb.injections) == 1 and kb.injections[0].place is None)) \
                 and (kb.injection.place is None or kb.injection.parameter is None):
 
-                if not conf.string and not conf.regexp and PAYLOAD.TECHNIQUE.BOOLEAN in conf.tech:
+                if not any((conf.string, conf.notString, conf.regexp)) and PAYLOAD.TECHNIQUE.BOOLEAN in conf.tech:
                     # NOTE: this is not needed anymore, leaving only to display
                     # a warning message to the user in case the page is not stable
                     checkStability()
@@ -527,7 +527,7 @@ def start():
                         errMsg += "Please, consider usage of tampering scripts as "
                         errMsg += "your target might filter the queries."
 
-                    if not conf.string and not conf.regexp:
+                    if not conf.string and not conf.notString and not conf.regexp:
                         errMsg += " Also, you can try to rerun by providing "
                         errMsg += "either a valid value for option '--string' "
                         errMsg += "(or '--regexp')"

lib/core/common.py

@@ -2362,7 +2362,7 @@ def setOptimize():
     #conf.predictOutput = True
     conf.keepAlive = True
     conf.threads = 3 if conf.threads < 3 else conf.threads
-    conf.nullConnection = not any([conf.data, conf.textOnly, conf.titles, conf.string, conf.regexp, conf.tor])
+    conf.nullConnection = not any([conf.data, conf.textOnly, conf.titles, conf.string, conf.notString, conf.regexp, conf.tor])
 
     if not conf.nullConnection:
         debugMsg = "turning off --null-connection switch used indirectly by switch -o"

lib/core/option.py

@@ -1865,6 +1865,14 @@ def __basicOptionValidation():
         errMsg = "option '--string' is incompatible with switch '--null-connection'"
         raise sqlmapSyntaxException, errMsg
 
+    if conf.notString and conf.nullConnection:
+        errMsg = "option '--not-string' is incompatible with switch '--null-connection'"
+        raise sqlmapSyntaxException, errMsg
+
+    if conf.string and conf.notString:
+        errMsg = "option '--string' is incompatible with switch '--not-string'"
+        raise sqlmapSyntaxException, errMsg
+
     if conf.regexp and conf.nullConnection:
         errMsg = "option '--regexp' is incompatible with switch '--null-connection'"
         raise sqlmapSyntaxException, errMsg

lib/core/optiondict.py

@@ -76,6 +76,7 @@ optDict = {
                                "level":             "integer",
                                "risk":              "integer",
                                "string":            "string",
+                               "notString":         "notString",
                                "regexp":            "string",
                                "code":              "integer",
                                "textOnly":          "boolean",

lib/parse/cmdline.py

@@ -245,6 +245,10 @@ def cmdLineParser():
                              help="String to match when "
                                   "query is evaluated to True")
 
+        detection.add_option("--not-string", dest="notString",
+                             help="String to match when "
+                                  "query is evaluated to False")
+
         detection.add_option("--regexp", dest="regexp",
                              help="Regexp to match when "
                                   "query is evaluated to True")

lib/request/comparison.py

@@ -31,7 +31,7 @@ def comparison(page, headers, code=None, getRatioValue=False, pageLength=None):
     return _
 
 def _adjust(condition, getRatioValue):
-    if not any([conf.string, conf.regexp, conf.code]):
+    if not any([conf.string, conf.notString, conf.regexp, conf.code]):
         # Negative logic approach is used in raw page comparison scheme as that what is "different" than original
         # PAYLOAD.WHERE.NEGATIVE response is considered as True; in switch based approach negative logic is not
         # applied as that what is by user considered as True is that what is returned by the comparison mechanism
@@ -54,14 +54,18 @@ def _comparison(page, headers, code, getRatioValue, pageLength):
     seqMatcher = threadData.seqMatcher
     seqMatcher.set_seq1(kb.pageTemplate)
 
-    if any([conf.string, conf.regexp]):
+    if any([conf.string, conf.notString, conf.regexp]):
         rawResponse = "%s%s" % (listToStrValue(headers.headers if headers else ""), page)
 
-        # String to match in page when the query is valid
+        # String to match in page when the query is True and/or valid
         if conf.string:
             return conf.string in rawResponse
 
-        # Regular expression to match in page when the query is valid
+        # String to match in page when the query is False and/or invalid
+        if conf.notString:
+            return conf.notString not in rawResponse
+
+        # Regular expression to match in page when the query is True and/or valid
         if conf.regexp:
             return re.search(conf.regexp, rawResponse, re.I | re.M) is not None
 

sqlmap.conf

@@ -247,6 +247,11 @@ risk = 1
 # Refer to the user's manual for further details.
 string = 
 
+# String to match within the raw response when the query is evaluated to 
+# False, only needed if the page content dynamically changes at each refresh.
+# Refer to the user's manual for further details.
+notString = 
+
 # Regular expression to match within the raw response when the query is
 # evaluated to True, only needed if the needed if the page content
 # dynamically changes at each refresh.