* add sshd.sandbox_dir config option
Sanitize SSH profile paths (ssh.go:514,683,719) — restrict os.Create(a[0]) to a safe directory.
Add a config option in the config file to specify the sandbox directory. For backwards compatibility, if the config is not specified, keep the current behavior.
* update default and example
* use os.TempDir() for sshd.sandbox_dir default
* split sandbox path validation into separate conditionals
Separate the combined && check in sshSanitizeFilePath into two distinct
conditionals with specific error messages: one for paths resolving to the
sandbox directory itself, and one for paths outside the sandbox.
Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>
* fix: trim leading zeros from p256 signature swap result
bigmod.Nat.Bytes() returns fixed-size 32-byte slices, but ASN.1 INTEGER
parsing strips leading zeros. This caused a flaky test failure (~1/256
chance) when the S value's high byte was zero.
Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>
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Co-authored-by: Claude <svc-devxp-claude@slack-corp.com>
