The filesystem permission model The POSIX base caseĮvery file and directory on the system will have a permission related to the file’s owner, the file’s group and everyone. Some of these are very interesting as we will see, as exploitation of them involves “writing” to files owned by root, while we are not root, which is not trivial, and can be very tricky. Symlinker permission denied mac how to#Then I will cover how to find these bugs, and finally I will go through in detail all of the bugs I found. I won’t cover every single detail of the permission model, as it would be a topic in itself, but rather what I found interesting from the exploitation perspective. In the following post I will first go over the permission model of the macOS filesystem, with focus on the POSIX part, discuss some of the non trivial cases it can produce, and also give a brief overview how it is extended. As it turns out it does exists, and not just on macOS directly but also on other apps, it appears to be a very fruitful of issue, without too much effort I found 5 exploitable bugs on macOS, 3 in Adobe installers. That exploit used a symlink to achieve this, so I though I will make a more general approach and see if this type of vulnerability exists in other places as well on macOS systems. Setuid'ing the included docker executable might work, but has the same security elevation issues as sudo.This research started around summer time in 2019, when everything settled down after my talk in 2019, where I detailed how did I gained root privileges via a benign App Store application, that I developed."Add jenkins to the docker group" - UNIX only and probably relies on matching up gids from host to container right?. Symlinker permission denied mac install#Install sudo and let jenkins sudo and run all docker commands with sudo: adds security issues.Other options suggested in questions like Execute docker host command inside jenkins docker container include: I'd love suggested improvements to make this solution work across host systems. Symlinker permission denied mac for mac#This is, however, not portable to other systems (and depends on that docker for mac group staying "staff," which I imagine isn't guaranteed). var/run/docker.sock:/var/run/docker.sock # To allow us to access /var/run/docker.sock on the MacĮNTRYPOINT This lets the jenkins user run docker commands on the host. So what I did was add jenkins to the "staff" group, because on my Mac, /var/run/docker.sock is symlinked down into /Users//Library/Containers//Data/s60 and is uid and gid staff. Plus, you can't do the chown in the Dockerfile because docker.sock doesn't exist yet, and you can't do it in the entrypoint because that runs as jenkins. Chowning /var/run/docker.sock to the jenkins user manually works, and it persists across container restarts and even image regeneration, but not past docker daemon restarts. Docker for Mac has a unique file permission model. I got this working, at least automated but currently only working on docker for Mac. What do I need to do in order to build and run an image that will run external docker containers on my Mac as a non-root user from inside the container? But I'm having trouble coming up with a solution for a distributable container - I can't do that chown in the Dockerfile because the file doesn't exist yet, and shimming in into the entrypoint doesn't help because that runs as jenkins. Per the advice in Permission Denied while trying to connect to Docker Daemon while running Jenkins pipeline in Macbook I chowned the /var/run/docker.sock file inside the container manually to jenkins and now jenkins can run docker. (I also tried running the container as privileged, that didn't help.) I'd rather not run the whole jenkins setup as root if I can help it. I want to distribute this container so answers that go and hack part of my Docker for Mac install won't really help me. I tried adding a docker group and adding jenkins to it inside the ubuntu container but that didn't help, since it's got nothing to do with the outside and Docker for Mac doesn't work like running this on linux where you can do semi easy uid/gid matching. I need the jenkins user to be able to run this. If I connect to the container as root (docker exec -u 0) it works though. Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get dial unix /var/run/docker.sock: connect: permission denied. I mount /var/run/docker.sock into the container, I stick a ubuntu docker binary inside it, and it's able to execute - but from inside the container as user "jenkins" when I run e.g. I'm trying to invoke docker on my OSX host running Docker for Mac 17.06.0-ce-mac17 from inside a running jenkins docker container ( jenkins:latest), per the procedure described at.
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