Closed martin-vitek closed 2 years ago
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I think this bug is somewhat unavoidable. DynamicUsers=
is really not meant to represent real users and are not meant to have persistent data (which is why it implies all sorts of other systemd directives to prevent persisting data). The only reason why HOME
and the working directory are set to /var/lib/<username>
, is because systemdspawner explicitly does this. I don't see an easy way to change the passwd entry that nss-systemd synthesizes, though.
To be honest, I'm not sure the way this is implemented really works, since nothing guarantees, that the UID of the dynamic user will be the same for multiple invocations or another user doesn't receive the UID later on (giving at least readonly access to the wrong user).
Unfortunately, it seems that it is unfixable. There is an issue in systemd, but it doesn't seem to be resolved any time soon.
As explained in this article, systemd is handling UIDs, so there shouldn't be a problem with them.
Unfortunately, it seems that it is unfixable. There is an issue in systemd, but it doesn't seem to be resolved any time soon.
Indeed. I see the point Lennart makes in the issue. The whole situation is somewhat illdefined and most places do seem to go the HOME
then pw->pw_dir
route, so since most everybody seems to do that anyway, the ones who don't are the outliers.
This is obviously a bit difficult for SSH, since the SSH daemon doesn't have access to the environment of the jupyter process, which is the only place where this exists. I do wonder, though, if OpenSSH's behaviour doesn't have edge cases, e.g. I could imagine shenanigans where PAM changes the value of HOME
, granted OpenSSH can be used without PAM (although I don't think most installations do this). I'm not familiar with the OpenSSH codebase, so I can't say, but if that were the case, that is something they should fix.
I'm not entirely sold that DynamicUser=
is the right thing for real users (i.e. people), but even for system users supporting SSH connections might be of value.
Alas, since this is not a systemdspawner issue, i guess this can be closed.
As explained in this article, systemd is handling UIDs, so there shouldn't be a problem with them.
Ah, true, I didn't remember how DynamicUser=
and StateDirectory=
work together.
Bug description
The variable
$HOME
is correctly set to/var/lib/martinv
, but some programs (ssh
) are getting home directory by callinggetent passwd $(whoami)
, which gives them path/
.Expected behaviour
Actual behaviour
How to reproduce
As dynamic user run in terminal:
getent passwd $(whoami)
. Or try to generate ssh keys withssh-keygen
.Your personal set up
Full environment
``` # packages in environment at /home/jupyter/mambaforge: # # Name Version Build Channel _libgcc_mutex 0.1 conda_forge conda-forge _openmp_mutex 4.5 1_gnu conda-forge abseil-cpp 20210324.2 h9c3ff4c_0 conda-forge absl-py 0.15.0 pyhd8ed1ab_0 conda-forge aiohttp 3.8.1 py39h3811e60_0 conda-forge aiosignal 1.2.0 pyhd8ed1ab_0 conda-forge alembic 1.7.5 pyhd8ed1ab_0 conda-forge alsa-lib 1.2.3 h516909a_0 conda-forge anyio 3.5.0 py39hf3d152e_0 conda-forge aom 3.2.0 h9c3ff4c_2 conda-forge appdirs 1.4.4 pyh9f0ad1d_0 conda-forge argon2-cffi 21.3.0 pyhd8ed1ab_0 conda-forge argon2-cffi-bindings 21.2.0 py39h3811e60_1 conda-forge asttokens 2.0.5 pyhd8ed1ab_0 conda-forge astunparse 1.6.3 pyhd8ed1ab_0 conda-forge async-timeout 4.0.2 pyhd8ed1ab_0 conda-forge async_generator 1.10 py_0 conda-forge attrs 21.4.0 pyhd8ed1ab_0 conda-forge autograd 1.3 py_0 conda-forge babel 2.9.1 pyh44b312d_0 conda-forge backcall 0.2.0 pyh9f0ad1d_0 conda-forge backports 1.0 py_2 conda-forge backports.functools_lru_cache 1.6.4 pyhd8ed1ab_0 conda-forge bcrypt 3.2.0 py39h3811e60_2 conda-forge black 21.7b0 pyhd8ed1ab_0 conda-forge bleach 4.1.0 pyhd8ed1ab_0 conda-forge blinker 1.4 py_1 conda-forge brotli 1.0.9 h7f98852_6 conda-forge brotli-bin 1.0.9 h7f98852_6 conda-forge brotlipy 0.7.0 py39h3811e60_1003 conda-forge bzip2 1.0.8 h7f98852_4 conda-forge c-ares 1.18.1 h7f98852_0 conda-forge ca-certificates 2021.10.8 ha878542_0 conda-forge cached-property 1.5.2 hd8ed1ab_1 conda-forge cached_property 1.5.2 pyha770c72_1 conda-forge cachetools 4.2.4 pyhd8ed1ab_0 conda-forge cadquery None py3.9 cadquery certifi 2021.10.8 py39hf3d152e_1 conda-forge certipy 0.1.3 py_0 conda-forge cffi 1.15.0 py39h4bc2ebd_0 conda-forge charset-normalizer 2.0.9 pyhd8ed1ab_0 conda-forge click 8.0.3 py39hf3d152e_1 conda-forge cma 2.7.0 py_0 conda-forge colorama 0.4.4 pyh9f0ad1d_0 conda-forge conda 4.11.0 py39hf3d152e_0 conda-forge conda-package-handling 1.7.3 py39h3811e60_1 conda-forge configurable-http-proxy 4.5.0 node17_h7e777a6_2 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1.1.0 py39hde0f152_1 conda-forge snappy 1.1.8 he1b5a44_3 conda-forge sniffio 1.2.0 py39hf3d152e_2 conda-forge sqlalchemy 1.4.31 py39h3811e60_0 conda-forge sqlite 3.37.0 h9cd32fc_0 conda-forge stack_data 0.1.4 pyhd8ed1ab_0 conda-forge statsmodels 0.13.1 py39hce5d2b2_0 conda-forge svt-av1 0.9.0 h9c3ff4c_0 conda-forge tabulate 0.8.9 pyhd8ed1ab_0 conda-forge tbb 2020.2 h4bd325d_4 conda-forge tbb-devel 2020.2 h4bd325d_4 conda-forge tensorboard 2.6.0 pyhd8ed1ab_1 conda-forge tensorboard-data-server 0.6.0 py39h95dcef6_1 conda-forge tensorboard-plugin-wit 1.8.1 pyhd8ed1ab_0 conda-forge tensorflow 2.6.2 cuda112py39h9333c2f_1 conda-forge tensorflow-base 2.6.2 cuda112py39he9472f8_1 conda-forge tensorflow-estimator 2.6.2 cuda112py39h9333c2f_1 conda-forge termcolor 1.1.0 py_2 conda-forge terminado 0.13.1 py39hf3d152e_0 conda-forge terminaltables 3.1.10 pyhd8ed1ab_0 conda-forge testpath 0.5.0 pyhd8ed1ab_0 conda-forge threadpoolctl 3.0.0 pyh8a188c0_0 conda-forge tk 8.6.11 h27826a3_1 conda-forge toml 0.10.2 pyhd8ed1ab_0 conda-forge tomli 1.2.2 pyhd8ed1ab_0 conda-forge tornado 6.1 py39h3811e60_2 conda-forge tqdm 4.62.3 pyhd8ed1ab_0 conda-forge traitlets 5.1.1 pyhd8ed1ab_0 conda-forge typed-ast 1.5.2 py39h3811e60_0 conda-forge typing-extensions 3.7.4.3 0 conda-forge typing_extensions 3.7.4.3 py_0 conda-forge typish 1.9.3 pyhd8ed1ab_0 conda-forge tzdata 2021e he74cb21_0 conda-forge unicodedata2 14.0.0 py39h3811e60_0 conda-forge urllib3 1.26.7 pyhd8ed1ab_0 conda-forge utfcpp 3.2.1 ha770c72_0 conda-forge vtk 9.0.1 qt_py39hd1b08ba_210 conda-forge wcwidth 0.2.5 pyh9f0ad1d_2 conda-forge webencodings 0.5.1 py_1 conda-forge websocket-client 1.2.3 pyhd8ed1ab_0 conda-forge werkzeug 2.0.2 pyhd8ed1ab_0 conda-forge wheel 0.37.0 pyhd8ed1ab_1 conda-forge wrapt 1.12.1 py39h3811e60_3 conda-forge x264 1!161.3030 h7f98852_1 conda-forge x265 3.5 h4bd325d_1 conda-forge xorg-fixesproto 5.0 h7f98852_1002 conda-forge xorg-kbproto 1.0.7 h7f98852_1002 conda-forge xorg-libice 1.0.10 h7f98852_0 conda-forge xorg-libsm 1.2.3 hd9c2040_1000 conda-forge xorg-libx11 1.7.2 h7f98852_0 conda-forge xorg-libxau 1.0.9 h7f98852_0 conda-forge xorg-libxdmcp 1.1.3 h7f98852_0 conda-forge xorg-libxext 1.3.4 h7f98852_1 conda-forge xorg-libxfixes 5.0.3 h7f98852_1004 conda-forge xorg-libxt 1.2.1 h7f98852_2 conda-forge xorg-xextproto 7.3.0 h7f98852_1002 conda-forge xorg-xproto 7.0.31 h7f98852_1007 conda-forge xz 5.2.5 h516909a_1 conda-forge yaml 0.2.5 h516909a_0 conda-forge yaml-cpp 0.6.3 he1b5a44_4 conda-forge yarl 1.7.2 py39h3811e60_1 conda-forge zeromq 4.3.4 h9c3ff4c_1 conda-forge zipp 3.7.0 pyhd8ed1ab_0 conda-forge zlib 1.2.11 h36c2ea0_1013 conda-forge zstd 1.5.0 ha95c52a_0 conda-forge ```Configuration
```python from oauthenticator.generic import GenericOAuthenticator c.Application.log_level = 10 c.JupyterHub.authenticator_class = GenericOAuthenticator c.GenericOAuthenticator.client_id = 'jupyter.fel.zcu.cz' c.GenericOAuthenticator.userdata_params = {'state': 'state'} c.GenericOAuthenticator.username_key = 'uid' c.GenericOAuthenticator.login_service = 'ORION' c.GenericOAuthenticator.scope = ['openid', 'profile'] c.JupyterHub.spawner_class = 'systemdspawner.SystemdSpawner' c.SystemdSpawner.cpu_limit = 4.0 c.SystemdSpawner.mem_limit = '2G' c.SystemdSpawner.isolate_tmp = True c.SystemdSpawner.isolate_devices = True c.SystemdSpawner.disable_user_sudo = True c.SystemdSpawner.readonly_paths = ['/'] c.SystemdSpawner.dynamic_users = True c.SystemdSpawner.extra_paths = ['/var/lib/private/{USERNAME}/.local/bin', '/home/jupyter/.local/lib'] c.SystemdSpawner.unit_extra_properties = {'RuntimeDirectoryPreserve': 'no'} c.JupyterHub.bind_url = 'https://jupyter.fel.zcu.cz' c.JupyterHub.ssl_cert = '/etc/letsencrypt/live/jupyter.fel.zcu.cz/fullchain.pem' c.JupyterHub.ssl_key = '/etc/letsencrypt/live/jupyter.fel.zcu.cz/privkey.pem' ```