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43 lines
2.2 KiB
Go
43 lines
2.2 KiB
Go
// Teleport
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// Copyright (C) 2026 Gravitational, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// Package user provides a thin concurrency safe wrapper around the
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// `os/user` APIs for Linux when CGO is enabled.
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//
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// On Linux, the `os/user` package may call into C-based NSS backends via cgo.
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// Some NSS implementations (or configurations) are not safe for concurrent
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// use and can deadlock or crash when lookups are performed concurrently.
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//
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// To avoid such failures, this package serializes calls to a small set of `os/user`
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// APIs on linux+cgo builds.
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// Non-Linux or non-cgo builds forward calls to the stdlib without locking.
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//
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// References:
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//
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// - Debian bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=831390
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// - Teleport issue: https://github.com/gravitational/teleport/issues/69662
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//
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// Note that this package is placed in `session/host` specifically because the `session` tree
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// is effectively a submodule within Teleport which guards against any imports from Teleport itself.
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// This was done to optimize the session helper load times and avoid bleeding runtime dependencies into the
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// session helper which would incease the load time and degrade latency. Since Teleport still calls
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// into the session helper code in the same process for which a mutex must be shared, the user package
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// is placed here despite less than ideal code organization.
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package user
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// TODO(okraport): revisit this module placement and investigate moving it to lib/utils/user if possible.
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// TODO(okraport): revisit this module to consider replacement with getent process shell out to avoid the mutex.
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