Github private repo with custom ssh key - Repository not found-CodePudding

Using OSX Montery.

I'm trying to access my private repo using a custom ssh key.

I have a custom ssh key "mykey" and "mykey.pub" using

ssh-keygen -t rsa -C "[email protected]"

I have added this key to the ssh agent using

ssh-add ~/.ssh/mykey

I have added the key from mykey.pub to my github account with read/write permissions

My ~/.ssh/config looks as follows:

Host gmail
    IdentityFile ~/.ssh/mykey
    User git
    HostName github.com
    UseKeychain yes

When I run ssh gmail I get the respone

PTY allocation request failed on channel 0
Hi username! You've successfully authenticated, but GitHub does not provide shell access.
Connection to github.com closed.

This leads me to believe that my setup is working, using the correct credentials.

However when I try to clone my repository (github.com:Username/myrepo.git) via

git clone gmail:Username/myrepo.git

I get

Cloning into 'myrepo'...
ERROR: Repository not found.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

I have tried multiple variations of this:

git clone [email protected]:Username/myrepo.git
git clone git@gmail:Username/myrepo.git
git clone [email protected]:Username/myrepo.git --config core.sshCommand="ssh -i ~/.ssh/mykey"

All to no avail.

GIT_CURL_VERBOSE=1 git clone gmail:Username/myrepo.git Does nothing for me either, I get the same response every time.

I'm at my wits end, not sure what I am doing wrong here. Any advice would be greatly appreciated.

EDIT:

Running GIT_SSH_COMMAND="ssh -vvv" git clone gmail:Username/myrepo.git will yield the following result:

Cloning into 'myrepo'...
OpenSSH_8.6p1, LibreSSL 3.3.6
debug1: Reading configuration data /Users/mylocalusername/.ssh/config
debug1: /Users/mylocalusername/.ssh/config line 1: Applying options for gmail
debug1: /Users/mylocalusername/.ssh/config line 39: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files
debug1: /etc/ssh/ssh_config line 54: Applying options for *
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/Users/mylocalusername/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/Users/mylocalusername/.ssh/known_hosts2'
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Connecting to github.com port 22.
debug1: Connection established.
debug1: identity file /Users/mylocalusername/.ssh/mykey type 0
debug1: identity file /Users/mylocalusername/.ssh/mykey-cert type -1
debug1: identity file /Users/mylocalusername/.ssh/id_ed25519 type 3
debug1: identity file /Users/mylocalusername/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.6
debug1: Remote protocol version 2.0, remote software version babeld-3d700a2c
debug1: compat_banner: no match: babeld-3d700a2c
debug3: fd 5 is O_NONBLOCK
debug1: Authenticating to github.com:22 as 'git'
debug3: record_hostkey: found key type ED25519 in file /Users/mylocalusername/.ssh/known_hosts:12
debug3: load_hostkeys_file: loaded 1 keys from github.com
debug1: load_hostkeys: fopen /Users/mylocalusername/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug3: order_hostkeyalgs: have matching best-preference key type [email protected], using HostkeyAlgorithms verbatim
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256
debug2: host key algorithms: ssh-ed25519,ecdsa-sha2-nistp256,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],[email protected],[email protected],aes256-ctr,aes192-ctr,aes128-ctr
debug2: ciphers stoc: [email protected],[email protected],[email protected],aes256-ctr,aes192-ctr,aes128-ctr
debug2: MACs ctos: [email protected],[email protected],hmac-sha2-512,hmac-sha2-256
debug2: MACs stoc: [email protected],[email protected],hmac-sha2-512,hmac-sha2-256
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ssh-ed25519 SHA256:[key]
debug3: record_hostkey: found key type ED25519 in file /Users/mylocalusername/.ssh/known_hosts:12
debug3: load_hostkeys_file: loaded 1 keys from github.com
debug1: load_hostkeys: fopen /Users/mylocalusername/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: Host 'github.com' is known and matches the ED25519 host key.
debug1: Found key in /Users/mylocalusername/.ssh/known_hosts:12
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /Users/mylocalusername/.ssh/id_ed25519 ED25519 SHA256:[key] explicit agent
debug1: Will attempt key: /Users/mylocalusername/.ssh/mykey RSA SHA256:[key] explicit agent
debug1: Will attempt key: [email protected] RSA SHA256:[key] agent
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,rsa-sha2-512,rsa-sha2-256,ssh-rsa>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /Users/mylocalusername/.ssh/id_ed25519 ED25519 SHA256:[key] explicit agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /Users/mylocalusername/.ssh/id_ed25519 ED25519 SHA256:[key] explicit agent
debug3: sign_and_send_pubkey: ED25519 SHA256:[jkey]
debug3: sign_and_send_pubkey: signing using ssh-ed25519 SHA256:[key]
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to github.com ([140.82.121.4]:22).
debug2: fd 6 setting O_NONBLOCK
debug2: fd 7 setting O_NONBLOCK
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Entering interactive session.
debug1: pledge: filesystem full
debug3: receive packet: type 80
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug3: client_input_hostkeys: received RSA key SHA256:[key]
debug3: client_input_hostkeys: received ECDSA key SHA256:[key]
debug3: client_input_hostkeys: received ED25519 key SHA256:[key]
debug1: client_input_hostkeys: searching /Users/mylocalusername/.ssh/known_hosts for github.com / (none)
debug3: hostkeys_foreach: reading file "/Users/mylocalusername/.ssh/known_hosts"
debug3: hostkeys_find: found ssh-rsa key under different name/addr at /Users/mylocalusername/.ssh/known_hosts:1
debug3: hostkeys_find: found ssh-rsa key under different name/addr at /Users/mylocalusername/.ssh/known_hosts:2
debug3: hostkeys_find: found ssh-rsa key under different name/addr at /Users/mylocalusername/.ssh/known_hosts:3
debug3: hostkeys_find: found ssh-rsa key under different name/addr at /Users/mylocalusername/.ssh/known_hosts:4
debug3: hostkeys_find: found ssh-rsa key under different name/addr at /Users/mylocalusername/.ssh/known_hosts:5
debug3: hostkeys_find: found ssh-rsa key under different name/addr at /Users/mylocalusername/.ssh/known_hosts:6
debug3: hostkeys_find: found ssh-rsa key under different name/addr at /Users/mylocalusername/.ssh/known_hosts:7
debug3: hostkeys_find: found ssh-ed25519 key at /Users/mylocalusername/.ssh/known_hosts:12
debug1: client_input_hostkeys: searching /Users/mylocalusername/.ssh/known_hosts2 for github.com / (none)
debug1: client_input_hostkeys: hostkeys file /Users/mylocalusername/.ssh/known_hosts2 does not exist
debug3: client_input_hostkeys: 3 server keys: 2 new, 18446744073709551615 retained, 2 incomplete match. 0 to remove
debug1: client_input_hostkeys: host key found matching a different name/address, skipping UserKnownHostsFile update
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 5 setting TCP_NODELAY
debug3: set_sock_tos: set socket 5 IP_TOS 0x20
debug2: client_session2_setup: id 0
debug1: Sending environment.
debug3: Ignored env TERM_PROGRAM
debug3: Ignored env TERM
debug3: Ignored env SHELL
debug3: Ignored env TMPDIR
debug3: Ignored env TERM_PROGRAM_VERSION
debug3: Ignored env TERM_SESSION_ID
debug3: Ignored env USER
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env __CF_USER_TEXT_ENCODING
debug3: Ignored env nvm_current_version
debug3: Ignored env PATH
debug1: channel 0: setting env GIT_PROTOCOL = "version=2"
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env __CFBundleIdentifier
debug3: Ignored env PWD
debug3: Ignored env XPC_FLAGS
debug3: Ignored env XPC_SERVICE_NAME
debug3: Ignored env SHLVL
debug3: Ignored env HOME
debug3: Ignored env GIT_SSH_COMMAND
debug3: Ignored env LOGNAME
debug1: channel 0: setting env LC_CTYPE = "UTF-8"
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env GIT_EXEC_PATH
debug3: Ignored env _
debug1: Sending command: git-upload-pack 'Username/myrepo.git'
debug2: channel 0: request exec confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 32000 rmax 35000
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: exec request accepted on channel 0
debug2: channel 0: rcvd ext data 29
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug3: receive packet: type 96
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug3: receive packet: type 97
debug2: channel 0: rcvd close
debug2: chan_shutdown_read: channel 0: (i0 o1 sock -1 wfd 6 efd 8 [write])
debug2: channel 0: input open -> closed
debug3: channel 0: will not send data after close
debug2: channel 0: obuf_empty delayed efd 8/(29)
ERROR: Repository not found.
debug2: channel 0: written 29 to efd 8
debug3: channel 0: will not send data after close
debug2: channel 0: obuf empty
debug2: chan_shutdown_write: channel 0: (i3 o1 sock -1 wfd 7 efd 8 [write])
debug2: channel 0: output drain -> closed
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug3: send packet: type 97
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 client-session (t4 r43 i3/0 o3/0 e[write]/0 fd -1/-1/8 sock -1 cc -1)

debug3: send packet: type 1
debug1: fd 0 clearing O_NONBLOCK
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
debug3: fd 1 is not O_NONBLOCK
Transferred: sent 2248, received 2280 bytes, in 0.3 seconds
Bytes per second: sent 7842.5, received 7954.1
debug1: Exit status 1

So for some reason my id_ed25519 will be used. I have it in my config file as my default key:

Host *
    AddKeysToAgent yes
    UseKeychain yes
    IdentityFile ~/.ssh/id_ed25519

Normally I would want to use that key, however it is already associated with another Github account (which is why I want to use a different key in the first place).

Even though my "mykey" key gets recognized first:

debug1: identity file /Users/mylocalusername/.ssh/mykey type 0
debug1: identity file /Users/mylocalusername/.ssh/mykey-cert type -1
debug1: identity file /Users/mylocalusername/.ssh/id_ed25519 type 3
debug1: identity file /Users/mylocalusername/.ssh/id_ed25519-cert type -1

Later on the id_ed25519 key is used first:

debug1: Will attempt key: /Users/mylocalusername/.ssh/id_ed25519 ED25519 SHA256:[key] explicit agent
debug1: Will attempt key: /Users/mylocalusername/.ssh/mykey RSA SHA256:[key] explicit agent
debug1: Will attempt key: [email protected] RSA SHA256:[key] agent

I'm assuming whats happening is that github recognizes the ed25519 key, but of course that key has no access to that repository and so I'm denied.

I thought this might be because of my known_hosts file, which contained an entry for github.com referring to my id_ed25519 key, but even after deleting it the id_ed25519 key will be used first, only that it asks me to add it to my known hosts:

Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'github.com' (ED25519) to the list of known hosts.

The only reason I could think of was that my key was RSA, so I regenerated it as ed25519, but I get the same result. Can I somehow force git to use the "mykey" key and not look for others?

CodePudding user response：

If the authentication is valid (ssh gmail works), but the repository URL cannot be "read", it can only means:

the URL is incorrect (case sensitive, or typo)
the username is not the same as the one authenticated, and is not a collaborator of the target private repository.

CodePudding user response：

You pointed me in the right direction. IdentitiesOnly yes was indeed what I was looking for. After that only the matching rules in the config applied, which still lead to the id_ed25519 being preferenced (regardless of wether it was on the top or the bottom of my config file, not sure why that is, but whatever).

To prevent this from happening I had to exclude it from being applied to the gmail host.

https://superuser.com/questions/859661/how-can-i-force-ssh-to-ignore-the-identityfile-listed-in-host-for-one-specif answered that for me.

So to get it working my ~/.ssh/config had to look like this:

Host * !gmail
    AddKeysToAgent yes
    UseKeychain yes
    IdentityFile ~/.ssh/id_ed25519
Host gmail
    IdentityFile ~/.ssh/mykey
    User git
    HostName github.com
    UseKeychain yes
    IdentitiesOnly yes

With that the following command (and all subsequent git commands) will work:

git clone gmail:Username/myrepo.git