luci-base: prevent UCI changes in CBI if form is not in submit state

Only process submitted data if the "cbi.submit" parameter is present as the
dispatcher will verify the integrity of the CSRF token in this case.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

diff --git a/modules/luci-base/luasrc/cbi.lua b/modules/luci-base/luasrc/cbi.lua
index f3d4618..a009095 100644 (file)
--- a/modules/luci-base/luasrc/cbi.lua
+++ b/modules/luci-base/luasrc/cbi.lua
@@ -367,63 +367,64 @@ end
 
 -- Use optimized UCI writing
 function Map.parse(self, readinput, ...)
-       self.readinput = (readinput ~= false)
-       self:_run_hooks("on_parse")
-
        if self:formvalue("cbi.skip") then
                self.state = FORM_SKIP
+       elseif not self.save then
+               self.state = FORM_INVALID
+       elseif not self:submitstate() then
+               self.state = FORM_NODATA
+       end
+
+       -- Back out early to prevent unauthorized changes on the subsequent parse
+       if self.state ~= nil then
                return self:state_handler(self.state)
        end
 
+       self.readinput = (readinput ~= false)
+       self:_run_hooks("on_parse")
+
        Node.parse(self, ...)
 
-       if self.save then
-               self:_run_hooks("on_save", "on_before_save")
+       self:_run_hooks("on_save", "on_before_save")
+       for i, config in ipairs(self.parsechain) do
+               self.uci:save(config)
+       end
+       self:_run_hooks("on_after_save")
+       if (not self.proceed and self.flow.autoapply) or luci.http.formvalue("cbi.apply") then
+               self:_run_hooks("on_before_commit")
                for i, config in ipairs(self.parsechain) do
-                       self.uci:save(config)
-               end
-               self:_run_hooks("on_after_save")
-               if self:submitstate() and ((not self.proceed and self.flow.autoapply) or luci.http.formvalue("cbi.apply")) then
-                       self:_run_hooks("on_before_commit")
-                       for i, config in ipairs(self.parsechain) do
-                               self.uci:commit(config)
-
-                               -- Refresh data because commit changes section names
-                               self.uci:load(config)
-                       end
-                       self:_run_hooks("on_commit", "on_after_commit", "on_before_apply")
-                       if self.apply_on_parse then
-                               self.uci:apply(self.parsechain)
-                               self:_run_hooks("on_apply", "on_after_apply")
-                       else
-                               -- This is evaluated by the dispatcher and delegated to the
-                               -- template which in turn fires XHR to perform the actual
-                               -- apply actions.
-                               self.apply_needed = true
-                       end
-
-                       -- Reparse sections
-                       Node.parse(self, true)
+                       self.uci:commit(config)
 
+                       -- Refresh data because commit changes section names
+                       self.uci:load(config)
                end
-               for i, config in ipairs(self.parsechain) do
-                       self.uci:unload(config)
-               end
-               if type(self.commit_handler) == "function" then
-                       self:commit_handler(self:submitstate())
+               self:_run_hooks("on_commit", "on_after_commit", "on_before_apply")
+               if self.apply_on_parse then
+                       self.uci:apply(self.parsechain)
+                       self:_run_hooks("on_apply", "on_after_apply")
+               else
+                       -- This is evaluated by the dispatcher and delegated to the
+                       -- template which in turn fires XHR to perform the actual
+                       -- apply actions.
+                       self.apply_needed = true
                end
+
+               -- Reparse sections
+               Node.parse(self, true)
+       end
+       for i, config in ipairs(self.parsechain) do
+               self.uci:unload(config)
+       end
+       if type(self.commit_handler) == "function" then
+               self:commit_handler(self:submitstate())
        end
 
-       if self:submitstate() then
-               if not self.save then
-                       self.state = FORM_INVALID
-               elseif self.proceed then
-                       self.state = FORM_PROCEED
-               else
-                       self.state = self.changed and FORM_CHANGED or FORM_VALID
-               end
+       if self.proceed then
+               self.state = FORM_PROCEED
+       elseif self.changed then
+               self.state = FORM_CHANGED
        else
-               self.state = FORM_NODATA
+               self.state = FORM_VALID
        end
 
        return self:state_handler(self.state)