tailscale

Commit Graph

Author	SHA1	Message	Date
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
Brad Fitzpatrick	3b1f99ded1	ssh/tailssh: fix Tailscale SSH to Linux Arch machines See https://github.com/tailscale/tailscale/issues/4924#issuecomment-1168201823 Arch uses a different login binary that makes the -h flag set the PAM service to "remote". So if they don't have that configured, don't pass -h. Thanks to @eddiezane for debugging! Updates #4924 Change-Id: I8d33e0afb2dfb99517bcea2f9d5d0c6247519b3c Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Maisem Ali	40503ef07a	ssh/tailssh: fix logging typo Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	c434e47f2d	ssh/tailssh: always use current time for policy evaluation Whenever the SSH policy changes we revaluate all open connections to make sure they still have access. This check was using the wrong timestamp and would match against expired policies, however this really isn't a problem today as we don't have policy that would be impacted by this check. Fixing it for future use. Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	a7d2024e35	ssh/tailssh: allow multiple sessions on the same conn Fixes #4920 Fixes tailscale/corp#5633 Updates #4479 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Adam Eijdenberg	9294a14a37	ssh/tailssh: limit setgroups to 16 on macOS Fixes #4938 Signed-off-by: Adam Eijdenberg <adam@continusec.com>	2 years ago
Adam Eijdenberg	7f807fef6c	ssh/tailssh: fix /usr/bin/login args on macOS Fixes #4931 Signed-off-by: Adam Eijdenberg <adam@continusec.com>	2 years ago
Brad Fitzpatrick	e428bba7a3	ssh/tailssh: add metrics Updates #3802 Change-Id: Ic9a4b8c51cff6dfe148a1c78bc0e5074195b7f80 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	928530a112	ipn/ipnlocal: shutdown sshServer on tailscale down Also lazify SSHServer initialization to allow restarting the server on a subsequent `tailscale up` Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	575aacb1e2	ssh/tailssh: terminate sessions on stdout copy failures Currently, killing a SCP copy with a Ctrl+C leaves the session hanging even though the stdout copy goroutine fails with an io.EOF. Taking a step back, when we are unable to send any more data back to the client we should just terminate the session as the client will stop getting any response from the server anyways. Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	7cd8c3e839	ssh/tailssh: terminate sessions when tailscaled shutsdown Ideally we would re-establish these sessions when tailscaled comes back up, however we do not do that yet so this is better than leaking the sessions. Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	760740905e	ssh/tailssh: only use `login` with TTY sessions Otherwise, the shell exits immediately causing applications like mosh and VSCode to fail. Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	5cd56fe8d5	ssh/tailssh: exec into `login` when launching a shell This has the added benefit of displaying the MOTD and reducing our dependency on the DBus interface. Fixes #4627 Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	a253057fc3	ssh/tailssh: refactor incubator flags Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	c1445155ef	ssh/tailssh: handle Control-C during hold-and-delegate prompt Fixes #4549 Change-Id: Iafc61af5e08cd03564d39cf667e940b2417714cc Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	3012a2e1ca	ssh/tailssh,ipn/ipnlocal: terminate any active sessions on `up --ssh=false` Currently the ssh session isn't terminated cleanly, instead the packets are just are no longer routed to the in-proc SSH server. This makes it so that clients get a disconnection when the `RunSSH` pref changes to `false`. Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	910ae68e0b	util/mak: move tailssh's mapSet into a new package for reuse elsewhere Change-Id: Idfe95db82275fd2be6ca88f245830731a0d5aecf Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
James Tucker	c2eff20008	ssh/tailssh: avoid user ssh configuration in tests Signed-off-by: James Tucker <james@tailscale.com>	3 years ago
David Anderson	a364bf2b62	ssh/tailssh: various typo fixes, clarifications. Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
Brad Fitzpatrick	c994eba763	ssh/tailssh: simplify matchRule with Reject rules Updates #3802 Change-Id: I59fe111eef5ac8abbcbcec922e293712a65a4830 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	31094d557b	ssh/tailssh: chmod the auth socket to be only user accessible Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	337c77964b	ssh/tailssh: set groups and gid in the incubated process Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	8ac4d52b59	ssh/tailssh: filter accepted environment variables Noted by @danderson Updates #3802 Change-Id: Iac70717ed57f11726209ac1ea93ddc6696605f94 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	89832c1a95	tailcfg: fix typo in SessionDuration field name Noted by @danderson. Updates #3802 Change-Id: Ide15f3f28e30f6abb5c94d7dcd218bd9482752a0 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	695f8a1d7e	ssh/tailssh: add support for sftp Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	5b4154342e	ssh/tailssh: fix double SSH-2.0- prefix in greeting banner gliderlabs/ssh was already adding the "SSH-2.0-" prefix. Updates #3802 Change-Id: I19a1cd9308371a2898e7883cf26e94c9b54bab29 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	2b8b887d55	ssh/tailssh: send banner messages during auth, move more to conn (VSCode Live Share between Brad & Maisem!) Updates #3802 Change-Id: Id8edca4481b0811debfdf56d4ccb1a46f71dd6d3 Co-Authored-By: Brad Fitzpatrick <bradfitz@tailscale.com> Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	f74ee80abe	ssh/tailssh: support expansions in public key fetch URL too Updates #3802 Change-Id: I5aa98bdab14fd1c1c00ba63b93f8d7e670f72437 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	14d077fc3a	ssh/tailssh: terminate ssh auth early if no policy can match Also bump github.com/tailscale/golang-x-crypto/ssh Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	8b81254992	ipn/ipnlocal: reject tailscale up --ssh if disabled on tailnet Updates #3802 Change-Id: I3f1e839391fe9b28270f506f4bb8d8e3d36716f5 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	91a187bf87	ssh/tailssh: make checkStillValid also consider username changes Currently if the policy changes and the session is logged in with local user "u1" and the new policy says they can only login with "u2" now, the user doesn't get kicked out because they had requested `rando@<ssh-host>` and the defaulting had made that go to `u1`. Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	93221b4535	ssh/tailssh: cache public keys fetched from URLs Updates #3802 Change-Id: I96715bae02bce6ea19f16b1736d1bbcd7bcf3534 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	ade7bd8745	ssh/tailssh: close sessions on policy change if no longer allowed Updates #3802 Change-Id: I98503c2505b77ac9d0cc792614fcdb691761a70c Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	8ee044ea4a	ssh/tailssh: make the SSH server a singleton, register with LocalBackend Remove the weird netstack -> tailssh dependency and instead have tailssh register itself with ipnlocal when linked. This makes tailssh.server a singleton, so we can have a global map of all sessions. Updates #3802 Change-Id: Iad5caec3a26a33011796878ab66b8e7b49339f29 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	da14e024a8	tailcfg, ssh/tailssh: optionally support SSH public keys in wire policy And clean up logging. Updates #3802 Change-Id: I756dc2d579a16757537142283d791f1d0319f4f0 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	3d180c0376	go.mod, ssh/tailssh, tempfork/gliderlabs: bump x/crypto/ssh fork for NoClientAuthCallback Prep for evaluating SSHPolicy earlier to decide whether certs are required, which requires knowing the target SSH user. Updates #3802 Change-Id: I2753ec8069e7f19c9121300d0fb0813c1c627c36 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	5a44f9f5b5	tempfork: temporarily fork gliderlabs/ssh and x/crypto/ssh While we rearrange/upstream things. gliderlabs/ssh is forked into tempfork from our prior fork at `be8b7add40` x/crypto/ssh OTOH is forked at https://github.com/tailscale/golang-x-crypto because it was gnarlier to vendor with various internal packages, etc. Its git history shows where it starts (2c7772ba30643b7a2026cbea938420dce7c6384d). Updates #3802 Change-Id: I546e5cdf831cfc030a6c42557c0ad2c58766c65f Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	0861923c21	ssh/tailssh, tailcfg: add more HoldAndDelegate expansions, document Updates #3802 Change-Id: I447f06b49e2a917bffe36881d0634c9195085512 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	091ea4a4a5	ssh/tailssh: support placeholders in SSHAction.HoldAndDelegate URL Updates #3802 Change-Id: I60f9827409d14fd4f4824d102ba11db49bf0d365 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	f7e976db55	tailcfg, ssh/tailssh: make SSHUser value '=' map ssh-user to same local-user Updates #3802 Change-Id: Icde60d4150ca15c25d615a4effb3d3c236f020a8 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	f30473211b	ssh/tailssh: start of implementing optional session recording To asciinema cast format. Updates #3802 Change-Id: Ifd3ea31922cd2c99068369cb1650e21f2545b0e1 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Josh Bleecher Snyder	32fd42430b	all: use cibuild.On Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Maisem Ali	b775df0b57	ssh/tailssh_test: skip TestSSH/stdin in CI Updates #4051 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	1e12a29806	ssh/tailssh_test: Skip the env test in CI Updates #4051 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Josh Bleecher Snyder	0868329936	all: use any instead of interface{} My favorite part of generics. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Maisem Ali	45a7f6689c	tailcfg: add field to allow LocalPortForwarding in SSHAction Updates #3802, #4129 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	98b45ef12c	ssh/tailssh: add support for agent forwarding. Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	6e86bbcb06	ssh/tailssh: add a new sshSession type to clean up existing+future code Updates #3802 Change-Id: I7054dca387f5e5aee1185937ecf41b77a5a07f1a Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Co-authored-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	462e75666b	ssh/tailssh: start sending the server version Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	bf3559171f	ssh/tailssh: set DBUS_SESSION_BUS_ADDRESS and SSH_TTY variables Updates #3802 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago

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74 Commits (d8cb5aae1720c3edc5e30f77b5fc7634e940a252)