tailscale

Commit Graph

Author	SHA1	Message	Date
Joe Tsai	61886e031e	ssh/tailssh: fix double race condition with non-pty command (#8405 ) There are two race conditions in output handling. The first race condition is due to a misuse of exec.Cmd.StdoutPipe. The documentation explicitly forbids concurrent use of StdoutPipe with exec.Cmd.Wait (see golang/go#60908) because Wait will close both sides of the pipe once the process ends without any guarantees that all data has been read from the pipe. To fix this, we allocate the os.Pipes ourselves and manage cleanup ourselves when the process has ended. The second race condition is because sshSession.run waits upon exec.Cmd to finish and then immediately proceeds to call ss.Exit, which will close all output streams going to the SSH client. This may interrupt any asynchronous io.Copy still copying data. To fix this, we close the write-side of the os.Pipes after the process has finished (and before calling ss.Exit) and synchronously wait for the io.Copy routines to finish. Fixes #7601 Signed-off-by: Joe Tsai <joetsai@digital-static.net> Co-authored-by: Maisem Ali <maisem@tailscale.com>	1 year ago
Maisem Ali	2e0aa151c9	ssh/tailssh: add support for remote/reverse port forwarding This basically allows running services on the SSH client and reaching them from the SSH server during the session. Updates #6575 Signed-off-by: Maisem Ali <maisem@tailscale.com>	1 year ago
Charlotte Brandhorst-Satzkorn	4e86857313	ssh/tailssh: add ssh session recording failed event type This change introduces a SSHSessionRecordingFailed event type that is used when a session recording fails to start or fails during a session, and the on failure indicates that it should fail open. Updates tailscale/corp#9967 Signed-off-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>	2 years ago
Maisem Ali	0ca8bf1e26	ssh/tailssh: close tty on session close We were only closing on side of the pty/tty pair. Close the other side too. Thanks to @fritterhoff for reporting and debugging the issue! Fixes #8119 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Brad Fitzpatrick	58ab66ec51	ssh/tailssh: support LDAP users for Tailscale SSH Fixes #4945 Change-Id: Ie013cb47684cb87928a44f92c66352310bfe53f1 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Charlotte Brandhorst-Satzkorn	29ded8f9f9	ssh/tailssh,tailcfg: add connID to ssheventnotifyrequest and castheader This change adds a ConnectionID field to both SSHEventNotifyRequest and CastHeader that identifies the ID of a connection to the SSH server. Updates tailscale/corp#9967 Signed-off-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>	2 years ago
Charlotte Brandhorst-Satzkorn	68307c1411	ssh/tailssh: send ssh event notifications on recording failures This change sends an SSHEventNotificationRequest over noise when a SSH session is set to fail closed and the session is unable to start because a recorder is not available or a session is terminated because connection to the recorder is ended. Each of these scenarios have their own event type. Updates tailscale/corp#9967 Signed-off-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>	2 years ago
Maisem Ali	be190e990f	ssh/tailssh: restore support for recording locally We removed it earlier in `916aa782af`, but we still want to support it for some time longer. Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Tom DNetto	c5bf868940	ssh/tailssh: improve debug logging around revoked sessions Updates https://github.com/tailscale/corp/issues/10943 Signed-off-by: Tom DNetto <tom@tailscale.com>	2 years ago
Maisem Ali	1b8a0dfe5e	ssh/tailssh: also handle recording upload failure during writes Previously we would error out when the recording server disappeared after the in memory buffer filled up for the io.Copy. This makes it so that we handle failing open correctly in that path. Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	7778d708a6	ssh/tailssh: handle dialing multiple recorders and failing open This adds support to try dialing out to multiple recorders each with a 5s timeout and an overall 30s timeout. It also starts respecting the actions `OnRecordingFailure` field if set, if it is not set it fails open. Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Andrew Dunham	280255acae	various: add golangci-lint, fix issues (#7905 ) This adds an initial and intentionally minimal configuration for golang-ci, fixes the issues reported, and adds a GitHub Action to check new pull requests against this linter configuration. Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I8f38fbc315836a19a094d0d3e986758b9313f163	2 years ago
Brad Fitzpatrick	2c0bda6e2e	ssh/tailssh: make Tailscale SSH work on gokrazy Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Maisem Ali	e04acabfde	ssh/tailssh: fix race in errors returned when starting recorder There were two code paths that could fail depending on how fast the recorder responses. This fixes that by returning the correct error from both paths. Fixes #7707 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	5ba57e4661	ssh/tailssh: add tests for recording failure Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	583e86b7df	ssh/tailssh: handle session recording when running in userspace mode Previously it would dial out using the http.DefaultClient, however that doesn't work when tailscaled is running in userspace mode (e.g. when testing). Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	8a246487c2	ssh/tailssh: enable recording of non-pty sessions Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	8765568373	ssh/tailssh: add docs to CastHeader fields Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	c350cd1f06	ssh/tailssh: use background context for uploading recordings Otherwise we see errors like ``` ssh-session(sess-20230322T005655-5562985593): recording: error sending recording to <addr>:80: Post "http://<addr>:80/record": context canceled ``` The ss.ctx is closed when the session closes, but we don't want to break the upload at that time. Instead we want to wait for the session to close the writer when it finishes, which it is already doing. Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	d92047cc30	ssh/tailssh: allow recorders to be configured on the first or final action Currently we only send down recorders in first action, allow the final action to replace them but not to drop them. Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	7a97e64ef0	ssh/tailssh: add more metadata to recording header Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	916aa782af	ssh/tailssh: stream SSH recordings to configured recorders Updates tailscale/corp#9967 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	e69682678f	ssh/tailssh: use context.WithCancelCause It was using a custom implmentation of the context.WithCancelCause, replace usage with stdlib. Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Will Norris	71029cea2d	all: update copyright and license headers This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>	2 years ago
Brad Fitzpatrick	1116602d4c	ssh/tailssh: add OpenBSD support for Tailscale SSH And bump go.mod for https://github.com/u-root/u-root/pull/2593 Change-Id: I36ec94c5b2b76d671cb739f1e9a1a43ca1d9d1b1 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	f837d179b9	ssh/tailssh: fix typo in error message "look up" is the verb. "lookup" is a noun. Change-Id: I81c99e12c236488690758fb5c121e7e4e1622a36 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Maisem Ali	2d653230ef	ssh/tailssh: only call CloseWrite when both stdout and stderr are done Updates #5209 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Pat Maddox	9bf3ef4167	ssh/tailssh: add Tailscale SSH (server) support on FreeBSD Change-Id: I607194b6ef99205e777f3df93a74ffe1a2e0344c Signed-off-by: Pat Maddox <pat@ratiopbc.com>	2 years ago
Brad Fitzpatrick	da8def8e13	all: remove old +build tags The //go:build syntax was introduced in Go 1.17: https://go.dev/doc/go1.17#build-lines gofmt has kept the +build and go:build lines in sync since then, but enough time has passed. Time to remove them. Done with: perl -i -npe 's,^// \+build.*\n,,' $(git grep -l -F '+build') Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	e24de8a617	ssh/tailssh: add password-forcing workaround for buggy SSH clients If the username includes a suffix of +password, then we accept password auth and just let them in like it were no auth. This exists purely for SSH clients that get confused by seeing success to their initial auth type "none". Co-authored-by: Maisem Ali <maisem@tailscale.com> Change-Id: I616d4c64d042449fb164f615012f3bae246e91ec Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Emmanuel T Odeke	680f8d9793	all: fix more resource leaks found by staticmajor Updates #5706 Signed-off-by: Emmanuel T Odeke <emmanuel@orijtech.com>	2 years ago
Maisem Ali	f172fc42f7	ssh/tailssh: close sshContext on context cancellation This was preventing tailscaled from shutting down properly if there were active sessions in certain states (e.g. waiting in check mode). Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	4de1601ef4	ssh/tailssh: add support for sending multiple banners Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	ecf6cdd830	ssh/tailssh: add TestSSHAuthFlow Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	f16b77de5d	ssh/tailssh: do the full auth flow during ssh auth Fixes #5091 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	b84ec521bf	ssh/tailssh: do not send EOT on session disconnection This was assumed to be the fix for mosh not working, however turns out all we really needed was the duplicate fd also introduced in the same commit (`af412e8874`). Fixes #5103 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Brad Fitzpatrick	b1bd96f114	go.mod, ssh/tailssh: fix ImplictAuthMethod typo Fixes #5745 Change-Id: Ie8bc88bd465a9cb35b0ae7782d61ce96480473ee Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Josh Soref	d4811f11a0	all: fix spelling mistakes Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>	2 years ago
Eng Zer Jun	f0347e841f	refactor: move from io/ioutil to io and os packages The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit replaces the existing io/ioutil functions with their new definitions in io and os packages. Reference: https://golang.org/doc/go1.16#ioutil Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>	2 years ago
Brad Fitzpatrick	74674b110d	envknob: support changing envknobs post-init Updates #5114 Change-Id: Ia423fc7486e1b3f3180a26308278be0086fae49b Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	4950fe60bd	syncs, all: move to using Go's new atomic types instead of ours Fixes #5185 Change-Id: I850dd532559af78c3895e2924f8237ccc328449d Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	8725b14056	all: migrate more code code to net/netip directly Instead of going through the tailscale.com/net/netaddr transitional wrappers. Updates #5162 Change-Id: I3dafd1c2effa1a6caa9b7151ecf6edd1a3fda3dd Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Maisem Ali	02a765743e	ssh/tailssh: fix deadlock in expandDelegateURL Also rename it to expandDelegateURLLocked, previously it was trying to acquire the mutex while holding the mutex. Fixes #5235 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Brad Fitzpatrick	a12aad6b47	all: convert more code to use net/netip directly perl -i -npe 's,netaddr.IPPrefixFrom,netip.PrefixFrom,' $(git grep -l -F netaddr.) perl -i -npe 's,netaddr.IPPortFrom,netip.AddrPortFrom,' $(git grep -l -F netaddr. ) perl -i -npe 's,netaddr.IPPrefix,netip.Prefix,g' $(git grep -l -F netaddr. ) perl -i -npe 's,netaddr.IPPort,netip.AddrPort,g' $(git grep -l -F netaddr. ) perl -i -npe 's,netaddr.IP\b,netip.Addr,g' $(git grep -l -F netaddr. ) perl -i -npe 's,netaddr.IPv6Raw\b,netip.AddrFrom16,g' $(git grep -l -F netaddr. ) goimports -w . Then delete some stuff from the net/netaddr shim package which is no longer neeed. Updates #5162 Change-Id: Ia7a86893fe21c7e3ee1ec823e8aba288d4566cd8 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	6a396731eb	all: use various net/netip parse funcs directly Mechanical change with perl+goimports. Changed {Must,}Parse{IP,IPPrefix,IPPort} to their netip variants, then goimports -d . Finally, removed the net/netaddr wrappers, to prevent future use. Updates #5162 Change-Id: I59c0e38b5fbca5a935d701645789cddf3d7863ad Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	7eaf5e509f	net/netaddr: start migrating to net/netip via new netaddr adapter package Updates #5162 Change-Id: Id7bdec303b25471f69d542f8ce43805328d56c12 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Maisem Ali	3e06b9ea7a	ssh/tailssh: add "ssh" to conn logs Fixes #5089 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	480fd6c797	ssh/tailssh: handle not-authenticated-yet connections in matchRule Also make more fields in conn.info thread safe, there was previously a data race here. Fixes #5110 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	af412e8874	ssh/tailssh: better handling of signals and exits We were not handling errors occurred while copying data between the subprocess and the connection. This makes it so that we pass the appropriate signals when to the process and the connection. This also fixes mosh. Updates #4919 Co-authored-by: James Tucker <raggi@tailscale.com> Co-authored-by: Brad Fitzpatrick <bradfitz@tailscale.com> Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	40503ef07a	ssh/tailssh: fix logging typo Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago

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104 Commits (2c782d742cd63098c8d54cdae67b9e29ea65337f)