Original post: hachyderm.io (Mastodon)
And you all complained when in C we used 1 and 0…
We use 0 and not 0…
Akcshually we use 0 and “not equal 0”, since “not 0” would be 0xFF…FF, and (at least gcc) gives back a 1 for a true expression. No idea about the spec, probably undefined…
Damn you for correcting me correctly! :D
The backend and frontend on the product I work on are like this.
As long as you remember that booleans are not strings and should always be parsed if they are, this won’t be a problem.
I am yet to see a boolean.parse() implementation in the wild that is case sensitive.
The could be using .js and .py files directly as config files and letting the language interpreter so the heavy lifting. Just like ye olde config.php.
And yes this absolutely will allow code injection by a config admin.
Is the backend Python and the frontend JavaScript? Because then that would happen and just be normal, because Boolean true is
Truein python.Can’t they just convert a “true” input to backend to uppercase
Depends on how it’s set up. If the setting is going into the env it’s a string, so I’d expect some sort of
if os.getenv("this_variable", "false").lower() == "true": # or maybe "in true, yes, on, 1" if you want to be weird like yaml this_variable = True else: this_variable = FalseExcept maybe a little more elegant and not typed on my phone.
But if the instructions are telling the user to edit the settings directly, like where I wrote this_variable=True, they’d need to case it correctly there.
Fyi, using a condition to assign a boolean is equivalent to assigning the condition itself. No need for the IF.
true, though sometimes i find the more verbose style easier to read, and more maintainable (eg: you want to do something else in the block, you can just add a line instead of changing your ternary / etc). Small things
Yep they should use a config file format like JSON or TOML or YAML or what have you, and then decode that into python objects. Using an actual programming language for config is dumb as hell IMO. (inb4 pissed off suckless fans)
I refer you to #7 on Bruce Tognazzini’s evergreen top ten list of design bugs.
Probably, but if you’re interpreting user inputs as raw code, you’ve got much much worse problems going on, lol.
Given the warning about capitalization, the best possible case is that they’re using ast.literal_eval() rather than throwing untrusted input into
eval().Err, I guess they might be comparing strings to ‘True’ and are choosing to be really strict about capitalization for some reason.
Yeah. Maybe .to_lower() is really expensive in their environment, lol.
It’s the settiings file… It’s probably supposed to only be written by the system admin.
A good place to put persistent malware. That’s why when using docker images always mount as ro if at all possible.
It’s you can modify the settings file you sure as hell can put the malware anywhere you want
It’s you can modify the settings file you sure as hell can put the malware anywhere you want
True. (But in case it amuses you or others reading along:) But a code settings file still carries it’s own special risk, as an executable file, in a predictable place, that gets run regularly.
An executable settings file is particularly nice for the attacker, as it’s a great place to ensure that any injected code gets executed without much effort.
In particular, if an attacker can force a reboot, they know the settings file will get read reasonably early during the start-up process.
So a settings file that’s written in code can be useful for an attacker who can write to the disk (like through a poorly secured upload prompt), but doesn’t have full shell access yet.
They will typically upload a reverse shell, and use a line added to settings to ensure the reverse shell gets executed and starts listening for connections.
Edit (because it may also amuse anyone reading along): The same attack can be accomplished with a JSON or YAML settings file, but it relies on the JSON or YAML interpreter having a known critical security flaw. Thankfully most of them don’t usually have one, most of the time, if they’re kept up to date.
Every environment has plenty of good places to put persistent malware. Even if you run your docker images as ro.
It’s not User input, it’s config file
[...]®ister=import os; os.system("sudo rm -rf /"); return TrueHey, that’s my username too. Or it was going to be, while the site was still up.
What a coincidence!
I guess I’ll wait for the site to come back, and see if it’s still available…
Searching for the phrase, documentation matches for Taiga so maybe you’re right!
deleted by creator
I curse the sadist who decided True should be uppercase in Python
guido, why did you make python so weird?
In this instance, I think there was some suggestion to write code in mostly lower case, including all user variables, or at least inCamelCaseLikeThis with a leading lower case letter, and so to make True and False stand out, they’ve got to be capitalised.
I mean. They could have been TRUE and FALSE. Would that have been preferable? Or how about a slightly more Pythonic style: __true__ and __false__
i would go with lowercase and just have it be a reserved word like the other ones. but I’m not super picky, i generally like to stick to what people are used to, and i can understand the reasoning behind the choice.
Hear me out, what about using JSON to store the configuration in the Python backend?
I like your idea, but hear me out:
A Python file for configuration is the best way to guarantee that any friendly code I write to help the user with config usually won’t execute. And I hate my users.
You need to use as many different formats as possible, otherwise you look unprofessional
But if it needs to be both why the case difference?
Different programming languages for frontend and backend
Oh duh, I was thinking this was in some configuration where they were set under the same line.
different languages I presume
Could be worse. At least it’s documented
To me the biggest problem, that AI might solve is documentation.
Have you tried to use AI for documentation? It’s pretty shit.
Have you tried to use AI for <thing>? It’s pretty shit.
Translation, proofreading, summarizing, brainstorming, boilerplate code, protein folding…
protein folding
We’re at the point where, due to how b2c tech services work, I think a lot of people think AI === LLM
I’ve had pretty good experience with using AI to find what I’m looking for in documentation, especially if the docs are in context
I think they mean having an AI read code and then write documentation for it. Not having an AI read documentation.
I’ve used AI to give me a good enough guess that I know the right keywords to search for too find the real documentation.
How about this:
Humans (or humans assisted by AI) write documentation
Users (devs included) can either choose to read the manual the old fashioned way or utilize it like a sort of swagger api documentation to give- Information to a question (How to do x)
- Provide a general example
- (Assuming it’s used with an IDE or has information about the project) Provide a personalized example on the implementation.
if publicRegistration.equalsIgnoreCase(“true”)
That makes me think, perhaps, you might be able to set it to
exec("stuff") or True…Why have the options be “frontend”, “backend”, or “none” when you can be this creative?
I’ve always hated case sensitivity. I know that at an ASCII level “variable” != “Variable” but is there really a reason to have a distinction between them?
You stated the reason yourself. Those are different values and matching in a case-insensitive manner is more work under the hood.
We do plenty of stuff for human consumption. Computers work for us, not the other way around. Insensitivity should be the default. It’s okay to give options. I’m not saying take that away.
✋ Case insensitive filesystem
👉 Case insensitive file sortingFor some reason we decided that a lot of formats written by computers and read by computers would use ASCII encoding instead of raw data.
Making a json or XML deserializer case insensitive would just make it slower for almost 0 benefit.
Humans have to make it do the work. And that’s how Mr; DROP TABLE makes his money.
You are thinking it’s easy because you only think of e == E, but I’ll let you look up collation and accents and, you know, Unicode and let you think about it.
There is nothing trivial about case sensitivity, except in trivial cases.
Implying Hell is frontend… yeah, actually, that tracks.
Baseball, huh?
var true = false;var false = true;So we need to be careful with upper- and lowercase. Meanwhile the docs: > settiings
Yes, the settiings are different than the settings. You also need to be careful with those.
no, settings = settings but settings != Settings, as we all know.
There’s a double-i in “settings” in the documentation screenshot
That’s what I get for having sucky vision.
That why you only sidekick. MC need perfect vision.
had to use a different spelliings at backend and frontend, otherwise it wouldn’t work.
They specifically said “this is not a typo”!!!
Cap in the back, low-key up front. Got it.
!!true
