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[vnet] fix: avoid empty host matchers in generated SSH config#56103

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nklaassen merged 2 commits intomasterfrom
nklaassen/fix-vnet-ssh-empty-hosts
Jun 26, 2025
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[vnet] fix: avoid empty host matchers in generated SSH config#56103
nklaassen merged 2 commits intomasterfrom
nklaassen/fix-vnet-ssh-empty-hosts

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This PR fixes a bug in VNet's SSH config file generator which will currently write a Host block with no matchers if the user is not logged in to any Teleport clusters. The is not valid and breaks the user's SSH configuration. The fix avoids writing the Host block at all if the user is not logged in to any clusters.

@nklaassen nklaassen added backport-required no-changelog Indicates that a PR does not require a changelog entry vnet labels Jun 25, 2025
@github-actions github-actions Bot requested review from bernardjkim and kimlisa June 25, 2025 20:46
@nklaassen nklaassen requested a review from rosstimothy June 25, 2025 20:53
Comment thread lib/vnet/opensshconfig.go Outdated
// To reliably advance the clock and allow runConfigurationLoop to update
// the config the test waits until the loop is blocked on the clock, then
// advances the clock, then waits until the loop is blocked again.
advance := func() {
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Perhaps a good candidate for synctest in the future?

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yes i would love to, already mentioned that in a comment

// strategy doesn't work. In go 1.25 we can use testing/synctest instead.

@nklaassen nklaassen requested a review from rosstimothy June 26, 2025 20:29
@public-teleport-github-review-bot public-teleport-github-review-bot Bot removed the request for review from kimlisa June 26, 2025 22:27
@nklaassen nklaassen added this pull request to the merge queue Jun 26, 2025
Merged via the queue into master with commit a30da08 Jun 26, 2025
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@nklaassen nklaassen deleted the nklaassen/fix-vnet-ssh-empty-hosts branch June 26, 2025 22:49
nklaassen added a commit that referenced this pull request Jun 26, 2025
nklaassen added a commit that referenced this pull request Jun 26, 2025
github-merge-queue Bot pushed a commit that referenced this pull request Jul 22, 2025
* [v17][vnet] feat: TCP dial to SSH targets

Backport #55087 to branch/v17

* [v17][vnet] feat: accept incoming SSH connections

Backport #55155 to branch/v17

* [v17][vnet] feat: forward SSH connections to target

Backport #55156 to branch/v17

* [v17][vnet] feat: write VNet SSH keys to TELEPORT_HOME

Backport #55228 to branch/v17

* [v17][vnet] feat: write OpenSSH-compatible config file for VNet SSH

Backport #55239 to branch/v17

* [v17][vnet] fix: support <hostname>.<leaf-cluster> for VNet SSH

Backport #55688 to branch/v17

* fix BlockUntil API for backport

* [v17][vnet] feat: add "Connect with VNet" button to SSH servers

Backport #55623 to branch/v17

* [v17][vnet] feat: support VNet SSH when cluster name does not match proxy public addr

Backport #55655 to branch/v17

* [v17][vnet] feat: add SSH configuration diagnostic

Backport #55594 to branch/v17

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>

* [v17][vnet] feat: show SSH status in VNet slider

Backport #55755 to branch/v17

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>

* [v17][vnet] feat: support proxy recording mode with VNet SSH

Backport #55788 to branch/v17

* [v17][vnet] feat: support diag checks on windows

Backport #55856 to branch/v17

* [v17] fix: data race in vnet.TestSSH

Backport #55980 to branch/v17

* [v17][vnet] feat: mention SSH on VNet info page

Backport #55973 to branch/v17

* [v17][vnet] feat: serve DNS on IPv4

Backport #55539 to branch/v17

* [v17][vnet] fix: close proxied channel only after data and requests are complete

Backport #56020 to branch/v17

* [v17][vnet] feat: automatic SSH client configuration

Backport #55923 to branch/v17

* VNet docs: Provide clear instructions for getting debug logs (#56068)

* VNet diag notification: Do not show button to open report if there's no workspace selected (#56067)

* VNet diag report: Don't show button in notification if there's no workspace

* Replace deprecated MutableRefObject with RefObject

* Make openReport not depend on value of rootClusterUri

Otherwise the effect that uses setInterval re-runs whenever the user
switches to another workspace.

* [v17][vnet] feat: automatic SSH client configuration in Connect

Backport #55924 to branch/v17

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>
Co-authored-by: Grzegorz Zdunek <grzegorz.zdunek@goteleport.com>

* [v17][vnet] fix: avoid empty host matchers in generated SSH config

Backport #56103 to branch/v17

* avoid t.Context() pre go1.24

* fix cspell lint

* [v17][docs] VNet SSH

Backport #56147 to branch/v17

* [v17][vnet] feat: SSH usage reporting

Backport #56537 to branch/v17

* [v17][vnet] fix: mask default IP route on windows

Backport #56957 to branch/v17

---------

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>
Co-authored-by: Grzegorz Zdunek <grzegorz.zdunek@goteleport.com>
github-merge-queue Bot pushed a commit that referenced this pull request Jul 22, 2025
* [v18][vnet] feat: TCP dial to SSH targets

Backport #55087 to branch/v18

* [v18][vnet] feat: accept incoming SSH connections

Backport #55155 to branch/v18

* [v18][vnet] feat: forward SSH connections to target

Backport #55156 to branch/v18

* [v18][vnet] feat: write VNet SSH keys to TELEPORT_HOME

Backport #55228 to branch/v18

* [v18][vnet] feat: write OpenSSH-compatible config file for VNet SSH

Backport #55239 to branch/v18

* [v18][vnet] fix: support <hostname>.<leaf-cluster> for VNet SSH

Backport #55688 to branch/v18

* [v18][vnet] feat: add "Connect with VNet" button to SSH servers

Backport #55623 to branch/v18

* fix test in backport

* [v18][vnet] feat: support VNet SSH when cluster name does not match proxy public addr

Backport #55655 to branch/v18

* [v18][vnet] feat: add SSH configuration diagnostic

Backport #55594 to branch/v18

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>

* [v18][vnet] feat: show SSH status in VNet slider

Backport #55755 to branch/v18

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>

* [v18][vnet] feat: support proxy recording mode with VNet SSH

Backport #55788 to branch/v18

* [v18][vnet] feat: support diag checks on windows

Backport #55856 to branch/v18

* [v18] fix: data race in vnet.TestSSH

Backport #55980 to branch/v18

* [v18][vnet] feat: mention SSH on VNet info page

Backport #55973 to branch/v18

* [v18][vnet] feat: serve DNS on IPv4

Backport #55539 to branch/v18

* [v18][vnet] fix: close proxied channel only after data and requests are complete

Backport #56020 to branch/v18

* [v18][vnet] feat: automatic SSH client configuration

Backport #55923 to branch/v18

* VNet diag notification: Do not show button to open report if there's no workspace selected (#56067)

* VNet diag report: Don't show button in notification if there's no workspace

* Replace deprecated MutableRefObject with RefObject

* Make openReport not depend on value of rootClusterUri

Otherwise the effect that uses setInterval re-runs whenever the user
switches to another workspace.

* [v18][vnet] feat: automatic SSH client configuration in Connect

Backport #55924 to branch/v18

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>
Co-authored-by: Grzegorz Zdunek <grzegorz.zdunek@goteleport.com>

* [v18][vnet] fix: avoid empty host matchers in generated SSH config

Backport #56103 to branch/v18

* [v18][docs] VNet SSH

Backport #56147 to branch/v18

* [v18][docs] add VNet warnings

Backport #56601 to branch/v18

* [v18][vnet] feat: SSH usage reporting

Backport #56537 to branch/v18

* [v18][vnet] fix: mask default IP route on windows

Backport #56957 to branch/v18

---------

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>
Co-authored-by: Grzegorz Zdunek <grzegorz.zdunek@goteleport.com>
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