diff options
| -rw-r--r-- | changelog.d/11209.docker | 1 | ||||
| -rw-r--r-- | docker/README.md | 13 | ||||
| -rwxr-xr-x | docker/start.py | 37 |
3 files changed, 28 insertions, 23 deletions
diff --git a/changelog.d/11209.docker b/changelog.d/11209.docker new file mode 100644 index 0000000000..838b165ac9 --- /dev/null +++ b/changelog.d/11209.docker @@ -0,0 +1 @@ +Avoid changing userid when started as a non-root user, and no explicit `UID` is set. diff --git a/docker/README.md b/docker/README.md index 38d182bf45..4349e71f87 100644 --- a/docker/README.md +++ b/docker/README.md @@ -65,7 +65,8 @@ The following environment variables are supported in `generate` mode: * `SYNAPSE_DATA_DIR`: where the generated config will put persistent data such as the database and media store. Defaults to `/data`. * `UID`, `GID`: the user id and group id to use for creating the data - directories. Defaults to `991`, `991`. + directories. If unset, and no user is set via `docker run --user`, defaults + to `991`, `991`. ## Running synapse @@ -97,7 +98,9 @@ The following environment variables are supported in `run` mode: `<SYNAPSE_CONFIG_DIR>/homeserver.yaml`. * `SYNAPSE_WORKER`: module to execute, used when running synapse with workers. Defaults to `synapse.app.homeserver`, which is suitable for non-worker mode. -* `UID`, `GID`: the user and group id to run Synapse as. Defaults to `991`, `991`. +* `UID`, `GID`: the user and group id to run Synapse as. If unset, and no user + is set via `docker run --user`, defaults to `991`, `991`. Note that this user + must have permission to read the config files, and write to the data directories. * `TZ`: the [timezone](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) the container will run with. Defaults to `UTC`. For more complex setups (e.g. for workers) you can also pass your args directly to synapse using `run` mode. For example like this: @@ -186,7 +189,7 @@ point to another Dockerfile. ## Disabling the healthcheck If you are using a non-standard port or tls inside docker you can disable the healthcheck -whilst running the above `docker run` commands. +whilst running the above `docker run` commands. ``` --no-healthcheck @@ -212,7 +215,7 @@ If you wish to point the healthcheck at a different port with docker command, ad ## Setting the healthcheck in docker-compose file You can add the following to set a custom healthcheck in a docker compose file. -You will need docker-compose version >2.1 for this to work. +You will need docker-compose version >2.1 for this to work. ``` healthcheck: @@ -226,5 +229,5 @@ healthcheck: ## Using jemalloc Jemalloc is embedded in the image and will be used instead of the default allocator. -You can read about jemalloc by reading the Synapse +You can read about jemalloc by reading the Synapse [README](https://github.com/matrix-org/synapse/blob/HEAD/README.rst#help-synapse-is-slow-and-eats-all-my-ram-cpu). diff --git a/docker/start.py b/docker/start.py index 16d6a8208a..ec9eeb49ae 100755 --- a/docker/start.py +++ b/docker/start.py @@ -120,6 +120,7 @@ def generate_config_from_template(config_dir, config_path, environ, ownership): ] if ownership is not None: + log(f"Setting ownership on /data to {ownership}") subprocess.check_output(["chown", "-R", ownership, "/data"]) args = ["gosu", ownership] + args @@ -144,12 +145,18 @@ def run_generate_config(environ, ownership): config_path = environ.get("SYNAPSE_CONFIG_PATH", config_dir + "/homeserver.yaml") data_dir = environ.get("SYNAPSE_DATA_DIR", "/data") + if ownership is not None: + # make sure that synapse has perms to write to the data dir. + log(f"Setting ownership on {data_dir} to {ownership}") + subprocess.check_output(["chown", ownership, data_dir]) + # create a suitable log config from our template log_config_file = "%s/%s.log.config" % (config_dir, server_name) if not os.path.exists(log_config_file): log("Creating log config %s" % (log_config_file,)) convert("/conf/log.config", log_config_file, environ) + # generate the main config file, and a signing key. args = [ "python", "-m", @@ -168,29 +175,23 @@ def run_generate_config(environ, ownership): "--open-private-ports", ] # log("running %s" % (args, )) - - if ownership is not None: - # make sure that synapse has perms to write to the data dir. - subprocess.check_output(["chown", ownership, data_dir]) - - args = ["gosu", ownership] + args - os.execv("/usr/sbin/gosu", args) - else: - os.execv("/usr/local/bin/python", args) + os.execv("/usr/local/bin/python", args) def main(args, environ): mode = args[1] if len(args) > 1 else "run" - desired_uid = int(environ.get("UID", "991")) - desired_gid = int(environ.get("GID", "991")) - synapse_worker = environ.get("SYNAPSE_WORKER", "synapse.app.homeserver") - if (desired_uid == os.getuid()) and (desired_gid == os.getgid()): - ownership = None - else: - ownership = "{}:{}".format(desired_uid, desired_gid) - if ownership is None: - log("Will not perform chmod/gosu as UserID already matches request") + # if we were given an explicit user to switch to, do so + ownership = None + if "UID" in environ: + desired_uid = int(environ["UID"]) + desired_gid = int(environ.get("GID", "991")) + ownership = f"{desired_uid}:{desired_gid}" + elif os.getuid() == 0: + # otherwise, if we are running as root, use user 991 + ownership = "991:991" + + synapse_worker = environ.get("SYNAPSE_WORKER", "synapse.app.homeserver") # In generate mode, generate a configuration and missing keys, then exit if mode == "generate": |