tailscale

Commit Graph

Author	SHA1	Message	Date
Brad Fitzpatrick	2c0bda6e2e	ssh/tailssh: make Tailscale SSH work on gokrazy Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Andrew Dunham	13377e6458	ssh/tailssh: always assert our final uid/gid Move the assertions about our post-privilege-drop UID/GID out of the conditional if statement and always run them; I haven't been able to find a case where this would fail. Defensively add an envknob to disable this feature, however, which we can remove after the 1.40 release. Updates #7616 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Iaec3dba9248131920204bd6c6d34bbc57a148185	2 years ago
Andrew Dunham	9de8287d47	ssh/tailssh: lock OS thread during incubator This makes it less likely that we trip over bugs like golang/go#1435. Updates #7616 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ic28c03c3ad8ed5274a795c766b767fa876029f0e	2 years ago
Andrew Dunham	39b289578e	ssh/tailssh: make uid an int instead of uint64 Follow-up to #7615 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ib4256bff276f6d5cf95838d8e39c87b3643bde37	2 years ago
Andrew Dunham	ccace1f7df	ssh/tailssh: fix privilege dropping on FreeBSD; add tests On FreeBSD and Darwin, changing a process's supplementary groups with setgroups(2) will also change the egid of the process, setting it to the first entry in the provided list. This is distinct from the behaviour on other platforms (and possibly a violation of the POSIX standard). Because of this, on FreeBSD with no TTY, our incubator code would previously not change the process's gid, because it would read the newly-changed egid, compare it against the expected egid, and since they matched, not change the gid. Because we didn't use the 'login' program on FreeBSD without a TTY, this would propagate to a child process. This could be observed by running "id -p" in two contexts. The expected output, and the output returned when running from a SSH shell, is: andrew@freebsd:~ $ id -p uid andrew groups andrew However, when run via "ssh andrew@freebsd id -p", the output would be: $ ssh andrew@freebsd id -p login root uid andrew rgid wheel groups andrew (this could also be observed via "id -g -r" to print just the gid) We fix this by pulling the details of privilege dropping out into their own function and prepending the expected gid to the start of the list on Darwin and FreeBSD. Finally, we add some tests that run a child process, drop privileges, and assert that the final UID/GID/additional groups are what we expect. More information can be found in the following article: https://www.usenix.org/system/files/login/articles/325-tsafrir.pdf Updates #7616 Alternative to #7609 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I0e6513c31b121108b50fe561c89e5816d84a45b9	2 years ago
Maisem Ali	223713d4a1	tailcfg,all: add and use Node.IsTagged() Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	0582829e00	ssh/tailssh: try launching commands with /usr/bin/login on macOS Updates #4939 Co-authored-by: Adam Eijdenberg <adam@continusec.com> Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	5787989d74	ssh/tailssh: detect user shell correctly on darwin Updates #6213 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Brad Fitzpatrick	b1248442c3	all: update to Go 1.20, use strings.CutPrefix/Suffix instead of our fork Updates #7123 Updates #5309 Change-Id: I90bcd87a2fb85a91834a0dd4be6e03db08438672 Signed-off-by: Brad Fitzpatrick <bradfitz@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	be67b8e75b	ssh/tailssh: fix Tailscale SSH to non-root tailscaled Fix regression from `337c77964b` where tailscaled started calling Setgroups. Prior to that, SSH to a non-root tailscaled was working. Instead, ignore any failure calling Setgroups if the groups are already correct. Fixes #6888 Change-Id: I561991ddb37eaf2620759c6bcaabd36e0fb2a22d Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	8047dfa2dc	ssh/tailssh: unify some of the incubator_* GOOS files into incubator.go In prep for fix for #6888 Change-Id: I79f780c6467a9b7ac03017b27d412d6b0d2f7e6b Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	84eaef0bbb	ssh/tailssh: don't swallow process exit code in be-child Thanks to @nshalman and @Soypete for debugging! Updates #6054 Change-Id: I74550cc31f8a257b37351b8152634c768e1e0a8a Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	651e0d8aad	ssh/tailssh: add envknob for default PATH As backup plan, just in case the earlier fix's logic wasn't correct and we want to experiment in the field or have users have a quicker fix. Updates #5285 Change-Id: I7447466374d11f8f609de6dfbc4d9a944770826d Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	56f7da0cfd	ssh/tailssh: set default Tailscale SSH $PATH for non-interactive commands Fixes #5285 Co-authored-by: Andrew Dunham <andrew@tailscale.com> Change-Id: Ic7e967bf6a53b056cac5f21dd39565d9c31563af Signed-off-by: Brad Fitzpatrick <bradfitz@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
Maisem Ali	1440742a1c	ssh/tailssh: use root / as cmd.Dir when users HomeDir doesn't exist Fixes #5224 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
Josh Soref	d4811f11a0	all: fix spelling mistakes Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.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	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
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
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
David Anderson	a364bf2b62	ssh/tailssh: various typo fixes, clarifications. Signed-off-by: David Anderson <danderson@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
Maisem Ali	695f8a1d7e	ssh/tailssh: add support for sftp Updates #3802 Signed-off-by: Maisem Ali <maisem@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	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	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
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	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
Maisem Ali	6d61b7906e	ssh/tailssh: handle terminal opcodes Updates #3802 #4146 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	da6ce27416	go.mod: move from github.com/gliderlabs/ssh to github.com/tailscale/ssh Updates #4146 Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	ba1adf6c24	ssh/tailssh: make pty termios options match OpenSSH Still not sure the exact rules of how/when/who's supposed to set these, but this works for now on making them match. Baby steps. Will research more and adjust later. Updates #4146 (but not enough to fix it, something's still wrong) Updates #3802 Change-Id: I496d8cd7e31d45fe9ede88fc8894f35dc096de67 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	1dd5cf62a5	ssh/tailssh: start login shell, fix arg passing, width/height mismatch Updates #3802 Change-Id: I137d7a79195ee86d5dd7c8999f2797fc3cb57cec Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	598c7a22e7	ssh/tailssh: use lu.Username not lu.Name. Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Maisem Ali	06c147d848	ssh/tailssh: create login sessions for new connections Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago

45 Commits (2c0bda6e2e46da7a69fdae47e5b9d9e5826a8275)