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Bad owner or permissions on ~/.ssh/config ssh error
The ~/.ssh/config symlink points to a file in nix store owned by admin user running nix-daemon (not root in my environment). Is it possible to come up with a workaround like create a file with different name then copy/chown/chmod it to what ssh would like?
Sorry about the delay! I'm not sure there is an ideal workaround. I think the most straight-forward would be to clone the repo and change https://github.com/rycee/home-manager/blob/99c900946dbbaf5ba1fd3b1c1fe83b18fb66c84e/modules/programs/ssh.nix#L259-L278 to instead read something like
home.activation.copySshConfig =
let
cfgFile = pkgs.writeText "ssh-config" ''
${concatStringsSep "\n" (
mapAttrsToList (n: v: "${n} ${v}") cfg.extraOptionOverrides)}
${concatStringsSep "\n\n" (
map matchBlockStr (
builtins.attrValues cfg.matchBlocks))}
Host *
ForwardAgent ${yn cfg.forwardAgent}
Compression ${yn cfg.compression}
ServerAliveInterval ${toString cfg.serverAliveInterval}
HashKnownHosts ${yn cfg.hashKnownHosts}
UserKnownHostsFile ${cfg.userKnownHostsFile}
ControlMaster ${cfg.controlMaster}
ControlPath ${cfg.controlPath}
ControlPersist ${cfg.controlPersist}
${replaceStrings ["\n"] ["\n "] cfg.extraConfig}
'';
in
dagEntryAfter ["writeBoundary"] ''
install -m600 -D ${cfgFile} $HOME/.ssh/config
'';
This should copy the configuration file into place, unconditionally overwriting the existing $HOME/.ssh/config
file.
Note, I haven't tested this so I might have missed some detail.
In any case, I hope some day to have a more elegant solution to this problem (and similar problems, like handling key files).
Thanks, that's exactly what I had in mind! I agree this approach would also be useful in other cases where more control over file permissions is desired. I was thinking that some kind of a collection to store all such file paths together with their permissions (and a corresponding function to create a file and add a tuple "source path/target path/permissions" to the collection) would be useful. Then there would be an extra step in the home-manager switch
process to traverse this collection and call install -mXXX
for each tuple.
Do either of you know what are the conditions under which ssh issues "bad owner or permissions"? I have my ~/.ssh/config
in the nix store, managed by home-manager, and I never encountered this… until I tried to use git from within Android Studio (IntelliJ). I configured it to use the native git command-line instead of its built-in, and specified the path as /home/league/.nix-profile/bin/git
, so I think it should behave the same in IntelliJ as on my terminal.
I wonder whether it's picking up a different ssh
in IntelliJ vs. my terminal.
I think the issue surfaces in FHS user envs. Android studio is running in one. I'm having the same issue when using ssh
in a build environment for a project at $WORK.
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Same issues here, git push
command cannot use in Android Studio : (
In case someone else find this issue, another workaround without forking anything would be applying a patch to openssh, like this:
# In configuration.nix
nixpkgs.overlays = [
(final: prev: {
openssh = prev.openssh.overrideAttrs (old: {
patches = (old.patches or [ ]) ++ [ ./openssh.patch ];
doCheck = false;
});
})
];
Patch file:
diff --git a/readconf.h b/readconf.h
index ded13c9..94f489e 100644
--- a/readconf.h
+++ b/readconf.h
@@ -203,7 +203,7 @@ typedef struct {
#define SESSION_TYPE_SUBSYSTEM 1
#define SESSION_TYPE_DEFAULT 2
-#define SSHCONF_CHECKPERM 1 /* check permissions on config file */
+#define SSHCONF_CHECKPERM 0 /* check permissions on config file */
#define SSHCONF_USERCONF 2 /* user provided config file not system */
#define SSHCONF_FINAL 4 /* Final pass over config, after canon. */
#define SSHCONF_NEVERMATCH 8 /* Match/Host never matches; internal only */
If this issue is effecting you, check the dereferenced owner and group e.g ls -Ll ~/.ssh/config
. I have no issues if the symbolic link is owned by the user and user's group and the txt file itself in the Nix store is owned by root:root.
However, if the permissions on the actual Nix store file are incorrect then this error will occur. It's not obvious because many commands will only show the symlink's owner & group not the linked files. The permissions on the Nix store file can be changed if you are using a non-NixOS Nix multi-user setup where Nix store is writable by root. If you ever run a sudo chown baduser:badgroup ~/.ssh
then the Nix store will have incorrect permissions.
You will probably only encounter this if many home-manager users share a common SSH config and therefore the symbolic link resolves to the same Nix store text file.
I'm not sure if a root RW nix store is correct for a Nix multi-user install but I checked a few different systems and all have a root RW store. With my home manager config, both the ssh and git commands are included in the home manager profile but I don't think the upstream Nix packages change this behavior.
I've noticed this when using the vscode.fhs
package. The integrated terminal receives the error.
- From inside the vscode integrated terminal (gets the error)
ls -Ll ~/.ssh/config
-r--r--r-- 1 nobody nogroup 425 Jan 1 1970 /home/mahdtech/.ssh/config
- From other terminals on the system like alacritty,gnome-terminal (no error)
ls -Ll ~/.ssh/config
-r--r--r-- 1 root root 425 Jan 1 1970 /home/mahdtech/.ssh/config
What is it about FHS environments that causes the change?
This issue has been mentioned on NixOS Discourse. There might be relevant details there:
https://discourse.nixos.org/t/nixos-home-manager-ssh-config-permissions/32056/2
This issue has been mentioned on NixOS Discourse. There might be relevant details there:
https://discourse.nixos.org/t/nixos-home-manager-ssh-config-permissions/32056/3
Another workaround if you don't want to mess with openssh (based on Stackoverflow answer).
home.file.".ssh/config" = {
target = ".ssh/config_source";
onChange = ''cat ~/.ssh/config_source > ~/.ssh/config && chmod 400 ~/.ssh/config'';
};