[lib-audit] S2-10 LiteLLM config, master key and backend keys written world-readable under /tmp - #2812
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The LiteLLM proxy config, master key, and backend API keys were written at umask mode (664) into a world-shared, pre-creatable /tmp/taos-litellm directory. Any local user could read the master key and every backend key, and a pre-created directory or planted shim .py gave code execution inside the proxy. - Config dir now defaults to <data_dir>/litellm (0700) instead of /tmp/taos-litellm when a data_dir is supplied; app.py passes data_dir so the secure location is used automatically - write_config creates the dir with mkdir(mode=0o700) + chmod(0o700) and writes litellm_config.yaml, taos_callback.py, and taos_auth.py through atomic_write_text(mode=0o600) from tinyagentos.atomic_io - The stderr log file in start() is opened with os.open(mode=0o600) - system_logs.py docstring updated to reflect the new secure location - pre-beta-to-beta.sh now clears both the old /tmp/taos-litellm and the new data_dir/litellm stale directories - Added PrivateTmp=yes and UMask=0077 to scripts/systemd/tinyagentos.service RED tests on origin/dev, green after fix: - test_config_dir_under_data_dir: config_dir is <data_dir>/litellm, not /tmp - test_config_dir_mode_0700: directory mode is 0o700 - test_config_files_mode_0600: all written files are 0o600 - test_unit_has_private_tmp / test_unit_has_umask: unit template has both lines PROVEN: files were mode 664 (umask), dir in world-writable /tmp; after fix all files are 0600 and dir is 0700 under data_dir. 252 affected tests pass. Docs-Reviewed: system_logs.py change is docstring-only, no route behavior altered
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Included review availability: Your plan provides up to 4 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughChangesLiteLLM configuration and generated files now use LiteLLM permission hardening
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to LiteLLM configuration, credentials, and stderr logs are now stored with restricted permissions and secure startup handling. No current merge-blocking risk is identified. Sequence Diagram(s)sequenceDiagram
participant tinyagentos.service
participant LLMProxy
participant LiteLLMConfigDir
participant LiteLLMProcess
tinyagentos.service->>LLMProxy: start service with PrivateTmp=yes
LLMProxy->>LiteLLMConfigDir: create or harden directory to 0700
LLMProxy->>LiteLLMConfigDir: write generated files with mode 0600
LLMProxy->>LiteLLMConfigDir: rotate stderr log and open a fresh 0600 inode
LLMProxy->>LiteLLMProcess: spawn subprocess
LLMProxy->>LLMProxy: close parent stderr handle
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@changelog.d/tsk-rc3f2j-lightllm-config-perms.md`:
- Line 3: Update the changelog description to distinguish the master key at
<data_dir>/.litellm_master_key from generated LiteLLM configuration and
backend-key artifacts under <data_dir>/litellm, so each path is documented
accurately while retaining the stated permissions and systemd hardening details.
In `@tests/test_llm_proxy.py`:
- Around line 822-839: Harden the .litellm_master_key reuse path used by
LLMProxy.write_config: open existing keys with O_NOFOLLOW, require a regular
file, and enforce 0600 before reading; fail closed for symlinks, non-regular
files, or permissions that cannot be repaired. Add tests covering each rejection
case alongside the existing write_config permission tests.
In `@tinyagentos/llm_proxy.py`:
- Around line 515-516: Update the LiteLLM startup flow in start() to close
stderr_handle immediately after subprocess.Popen() succeeds and also when
Popen() raises FileNotFoundError, ensuring every parent-side log handle is
released on both paths.
- Line 515: Update the stderr log setup around stderr_fd to call
os.fchmod(stderr_fd, 0o600) after opening the file and before os.fdopen,
ensuring existing logs receive the restrictive mode. Add a test that pre-creates
the log with mode 0644 and verifies it is changed to 0600.
- Around line 185-188: Update write_config around the os.chmod call so any
OSError is propagated and atomic_write_bytes is not reached when directory
hardening fails; remove the silent pass and add a regression test that forces
chmod failure for an insecure directory and verifies no generated file is
written.
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changelog.d/tsk-rc3f2j-lightllm-config-perms.mdscripts/pre-beta-to-beta.shscripts/systemd/tinyagentos.servicetests/test_llm_proxy.pytinyagentos/llm_proxy.pytinyagentos/routes/system_logs.py
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…arden stderr log UMask=0077 on the controller unit made every freshly downloaded model 0600 taos:taos, unreadable by the llama-cpp/hailo/rk* backend units that install-*.sh runs as a different user — removed, kept PrivateTmp. Per-file modes already cover this PR's secrets. write_config() now raises instead of continuing when it can't chmod the config dir to 0700, so nothing gets written into an insecure directory. The stderr log is fchmod'd to 0600 on every open (not just creation), and the parent's log handle is closed after Popen on both the success and failed-spawn paths.
Owner
Author
Fold pass 2026-09-06Lead finding (merge blocker) — Fixed
Diff: PrivateTmp=yes
-UMask=0077
Environment=PYTHONUNBUFFERED=1Threads — disposition
RED-first evidence
Test run
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Inline comments:
In `@tests/test_llm_proxy.py`:
- Line 998: Update the assertion in the unit test to detect systemd UMask
directives with optional whitespace around the equals sign, using the suggested
multiline regular-expression pattern instead of a literal substring check.
In `@tinyagentos/llm_proxy.py`:
- Line 524: Update the stderr log setup near os.fchmod so stale logs are rotated
or replaced with a newly created 0600 inode before Popen starts LiteLLM; open
the subprocess stderr destination against that new inode rather than appending
to the existing file, and remove the in-place mode-only handling.
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changelog.d/tsk-rc3f2j-lightllm-config-perms.mdscripts/systemd/tinyagentos.servicetests/test_llm_proxy.pytinyagentos/llm_proxy.py
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…tch unit hardening
Owner
Author
Fold pass 2026-09-06 (round 2)Fixed
RED-first testsUMask/PrivateTmp regex blindness: Test results |
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Inline comments:
In `@tests/test_llm_proxy.py`:
- Line 846: Remove the redundant f-string prefixes from the four assertion
messages in the affected test cases, including the assertion near
rotated_content and the additional locations noted by the review, leaving their
message text and assertion behavior unchanged.
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CARD TITLE (intent, not commit subject): [lib-audit] S2-10 LiteLLM config, master key and backend keys written world-readable under /tmp
Autonomous build of board card tsk-rc3f2j.
The LiteLLM proxy config, master key, and backend API keys were written at
umask mode (664) into a world-shared, pre-creatable /tmp/taos-litellm
directory. Any local user could read the master key and every backend key,
and a pre-created directory or planted shim .py gave code execution inside
the proxy.
when a data_dir is supplied; app.py passes data_dir so the secure location
is used automatically
litellm_config.yaml, taos_callback.py, and taos_auth.py through
atomic_write_text(mode=0o600) from tinyagentos.atomic_io
data_dir/litellm stale directories
model store under <data_dir>/models is read by backend units — llama-cpp,
hailo, rk* — that run as a different user than the controller, so a
controller-wide umask would break their access to freshly downloaded models;
per-file modes are the hardening mechanism, not a global umask)
RED tests on origin/dev, green after fix:
against re-adding the model-store-breaking global umask)
PROVEN: files were mode 664 (umask), dir in world-writable /tmp; after fix
all files are 0600 and dir is 0700 under data_dir. 252 affected tests pass.
Docs-Reviewed: system_logs.py change is docstring-only, no route behavior altered
Files:
changelog.d/tsk-rc3f2j-lightllm-config-perms.md | 3 +
scripts/pre-beta-to-beta.sh | 13 +++--
scripts/systemd/tinyagentos.service | 2 +
tests/test_llm_proxy.py | 77 +++++++++++++++++++++++++
tinyagentos/llm_proxy.py | 43 +++++++++++---
tinyagentos/routes/system_logs.py | 7 ++-
6 files changed, 130 insertions(+), 15 deletions(-)
Summary by CodeRabbit
Security
Maintenance