The password could only be given through the PASSWORD variable, so Docker
Compose and Swarm secrets were unusable and the password sat in the container
environment.
PASSWORD_FILE and TOKEN_FILE read a secret from a mounted file. Only trailing
newlines are stripped, since secret files are usually written with one and a
password that silently carries it just fails to authenticate; everything else,
including surrounding spaces, belongs to the secret. Setting both a variable
and a file for one secret is rejected rather than resolved by precedence,
because the two are meant to be the same value and quietly picking one hides
the mistake until authentication fails.
The installed seaf-cli supports token authentication and ignores the password
when a token is given, so sync now passes -T instead of -p. The account
password no longer appears in any command line. The token does, because
seaf-cli accepts credentials only as arguments, but a token can be revoked on
the server. This is documented in the README.
Both secrets are masked before a command is logged.
Tests cover newline handling, empty and missing files, conflicting sources,
and that neither secret reaches the logs. Requests are now blocked in tests:
the client retries with backoff, so a test that reached the network appeared
to hang instead of failing.
Commands were joined into a string and passed to "su -c", so a login shell
parsed every interpolated value. A library name is chosen on the server, and
"sync -d /dsc/seafile/<name>" put it straight into that string: a library
named 'Docs; touch /tmp/pwned; #' ran as an arbitrary command. Confirmed
against the built image before and after this change.
Every command is now an argument list executed by "runuser --", which execs
directly with no shell. runuser -u sets the same HOME and a PATH that still
finds the seaf-cli wrapper, so the daemon environment is unchanged.
The password no longer needs its surrounding quotes, which also fixes
passwords containing quotes, dollar signs, and backticks.
Library names are untrusted, so dsc/paths.py reduces each one to a single
path component and proves the result stays under the libraries directory
with symlinks resolved. Empty, ".", "..", and names containing a separator
are skipped with a warning; names that would collide are suffixed with their
library ID rather than sharing a directory.
Tests cover quotes, command substitutions, separators, newlines, absolute
paths, parent traversal, Unicode, and colliding names. They run in a separate
CI job so application failures stay distinguishable from packaging failures.
Maxim Shulga