podman remote fails when .ssh/known_hosts contains outdated ciphers

[tengelmeier]

Issue Description

podman info fails when .ssh/known_hosts contains unknown ciphers

Steps to reproduce the issue

Steps to reproduce the issue

1. add an unknown cipher to .ssh/known_hosts (e.g. for macOS 15 192.168.10.10 SHA256:sv4XrPwL60H)

2. run podman info

Expected: Unknown Ciphers skipped
Real: Error above

Describe the results you received

>podman info           
OS: darwin/arm64
buildOrigin: brew
provider: applehv
version: 5.4.0

Cannot connect to Podman. Please verify your connection to the Linux system using `podman system connection list`, or try `podman machine init` and `podman machine start` to manage a new Linux VM
Error: unable to connect to Podman socket: knownhosts: /Users/xx/.ssh/known_hosts:4: knownhosts: missing key type pattern

Describe the results you expected

>podman info           
podman info
Client:
  APIVersion: 5.4.0
  BuildOrigin: brew
  Built: 1739290083
  BuiltTime: Tue Feb 11 17:08:03 2025
[...]

podman info output

Client:
  APIVersion: 5.4.0
  BuildOrigin: brew
  Built: 1739290083
  BuiltTime: Tue Feb 11 17:08:03 2025
  GitCommit: ""
  GoVersion: go1.23.6
  Os: darwin
  OsArch: darwin/arm64
  Version: 5.4.0
host:
  arch: arm64
  buildahVersion: 1.39.0
  cgroupControllers:
  - cpuset
  - cpu
  - io
  - memory
  - pids
  - rdma
  - misc
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.12-3.fc41.aarch64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.12, commit: '
  cpuUtilization:
    idlePercent: 99.53
    systemPercent: 0.23
    userPercent: 0.25
  cpus: 2
  databaseBackend: sqlite
  distribution:
    distribution: fedora
    variant: coreos
    version: "41"
  eventLogger: journald
  freeLocks: 2047
  hostname: localhost.localdomain
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 6.12.9-200.fc41.aarch64
  linkmode: dynamic
  logDriver: journald
  memFree: 3255861248
  memTotal: 3791171584
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.13.1-1.fc41.aarch64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.13.1
    package: netavark-1.13.1-1.fc41.aarch64
    path: /usr/libexec/podman/netavark
    version: netavark 1.13.1
  ociRuntime:
    name: crun
    package: crun-1.19.1-1.fc41.aarch64
    path: /usr/bin/crun
    version: |-
      crun version 1.19.1
      commit: 3e32a70c93f5aa5fea69b50256cca7fd4aa23c80
      rundir: /run/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +LIBKRUN +WASM:wasmedge +YAJL
  os: linux
  pasta:
    executable: /usr/bin/pasta
    package: passt-0^20241211.g09478d5-1.fc41.aarch64
    version: |
      pasta 0^20241211.g09478d5-1.fc41.aarch64-pasta
      Copyright Red Hat
      GNU General Public License, version 2 or later
        <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
      This is free software: you are free to change and redistribute it.
      There is NO WARRANTY, to the extent permitted by law.
  remoteSocket:
    exists: true
    path: unix:///run/podman/podman.sock
  rootlessNetworkCmd: pasta
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: false
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: true
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.3.1-1.fc41.aarch64
    version: |-
      slirp4netns version 1.3.1
      commit: e5e368c4f5db6ae75c2fce786e31eef9da6bf236
      libslirp: 4.8.0
      SLIRP_CONFIG_VERSION_MAX: 5
      libseccomp: 2.5.5
  swapFree: 0
  swapTotal: 0
  uptime: 1h 32m 32.00s (Approximately 0.04 days)
  variant: v8
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - docker.io
store:
  configFile: /usr/share/containers/storage.conf
  containerStore:
    number: 1
    paused: 0
    running: 0
    stopped: 1
  graphDriverName: overlay
  graphOptions:
    overlay.additionalImageStores:
    - /usr/lib/containers/storage
    overlay.imagestore: /usr/lib/containers/storage
    overlay.mountopt: nodev,metacopy=on
  graphRoot: /var/lib/containers/storage
  graphRootAllocated: 93531090944
  graphRootUsed: 3995615232
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Supports shifting: "true"
    Supports volatile: "true"
    Using metacopy: "true"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 1
  runRoot: /run/containers/storage
  transientStore: false
  volumePath: /var/lib/containers/storage/volumes
version:
  APIVersion: 5.4.0
  BuildOrigin: Fedora Project
  Built: 1739232000
  BuiltTime: Tue Feb 11 01:00:00 2025
  GitCommit: ""
  GoVersion: go1.23.5
  Os: linux
  OsArch: linux/arm64
  Version: 5.4.0

Podman in a container

No

Privileged Or Rootless

None

Upstream Latest Release

Yes

Additional environment details

Additional environment details

Additional information

Additional information like issue happens only occasionally or issue happens with a particular architecture or on a particular setting

[jakecorrenti]

It looks like you installed podman from Homebrew. Can you try installing from the pkginstaller and see if that works? Installing from Homebrew is not a supported method. Thanks!

[baude]

if you repeat it with the installer, can you share the offending line?

[tengelmeier]

uninstalled via homebrew and installed with the installer => same issue

Putting this in line 1 of .ssh/known_hosts

192.168.1.1 SHA256:7b248364ac549a605dc9ee9ef75a3581ec95b58817119d11d01bb2acc7992c8e

results in

podman info
OS: darwin/arm64
buildOrigin: pkginstaller
provider: applehv
version: 5.4.0

Cannot connect to Podman. Please verify your connection to the Linux system using `podman system connection list`, or try `podman machine init` and `podman machine start` to manage a new Linux VM
Error: unable to connect to Podman socket: knownhosts: /Users/xx/.ssh/known_hosts:1: knownhosts: missing key type pattern

[atlemagnussen]

I also get this error now.
Fun thing though - it worked earlier today on the same version 5.3.2 from brew.

Now it does not work on either 5.3.2 or 5.4.0 from pkginstaller

Edit: it works when I removed known_hosts and reconnected and accepted. Did not keep track of before values unfortunately. Key has been the same ed25519 all the time

it adds 3 lines to known hosts:
192.168.1.2 ssh-ed25519
192.168.1.2 ssh-rsa
192.168.1.2 ecdsa-sha2-nistp256

and that is working fine