Error connecting to an SSH server running on behalf of an unprivileged user #2403
Description
Prerequisites
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- Make sure you are able to repro it on the latest version
- Search the existing issues.
Steps to reproduce
I am running sshd directly from powershell as an unprivileged local user Admin_1475. It is assumed that I will be able to connect under the same user via SSH.
The configuration is the standard sshd_config_default, which is stored in the release archive. However, the HostKey parameter has only been changed there to point to the RSA key.
The sshd is launched via .\sshd.exe -f .\sshd_config_default.
The connection to the server takes place via .\ssh.exe Admin_1475@localhost -vvv
Expected behavior
It is expected that I get SSH access on behalf of the user with whom SSH is running.Actual behavior
Getting error and reset connection (see detailed log)Error details
OpenSSH_for_Windows_9.8p2 Win32-OpenSSH-GitHub, LibreSSL 4.0.0
debug3: Failed to open file:C:/Users/user/.ssh/config error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_config error:2
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> 'C:\\Users\\user/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> 'C:\\Users\\user/.ssh/known_hosts2'
debug2: resolving "localhost" port 22
debug3: resolve_host: lookup localhost:22
debug3: channel_clear_timeouts: clearing
debug3: ssh_connect_direct: entering
debug1: Connecting to localhost [::1] port 22.
debug1: Connection established.
debug3: Failed to open file:C:/Users/user/.ssh/id_rsa error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_rsa.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_rsa error:2
debug1: identity file C:\\Users\\user/.ssh/id_rsa type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_rsa-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_rsa-cert.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_rsa-cert error:2
debug1: identity file C:\\Users\\user/.ssh/id_rsa-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_ecdsa error:2
debug1: identity file C:\\Users\\user/.ssh/id_ecdsa type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa-cert.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_ecdsa-cert error:2
debug1: identity file C:\\Users\\user/.ssh/id_ecdsa-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa_sk error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa_sk.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_ecdsa_sk error:2
debug1: identity file C:\\Users\\user/.ssh/id_ecdsa_sk type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa_sk-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ecdsa_sk-cert.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_ecdsa_sk-cert error:2
debug1: identity file C:\\Users\\user/.ssh/id_ecdsa_sk-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519 error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_ed25519 error:2
debug1: identity file C:\\Users\\user/.ssh/id_ed25519 type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519-cert.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_ed25519-cert error:2
debug1: identity file C:\\Users\\user/.ssh/id_ed25519-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519_sk error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519_sk.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_ed25519_sk error:2
debug1: identity file C:\\Users\\user/.ssh/id_ed25519_sk type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519_sk-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_ed25519_sk-cert.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_ed25519_sk-cert error:2
debug1: identity file C:\\Users\\user/.ssh/id_ed25519_sk-cert type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_xmss error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_xmss.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_xmss error:2
debug1: identity file C:\\Users\\user/.ssh/id_xmss type -1
debug3: Failed to open file:C:/Users/user/.ssh/id_xmss-cert error:2
debug3: Failed to open file:C:/Users/user/.ssh/id_xmss-cert.pub error:2
debug3: failed to open file:C:/Users/user/.ssh/id_xmss-cert error:2
debug1: identity file C:\\Users\\user/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_for_Windows_9.8 Win32-OpenSSH-GitHub
debug1: Remote protocol version 2.0, remote software version OpenSSH_for_Windows_9.8 Win32-OpenSSH-GitHub
debug1: compat_banner: match: OpenSSH_for_Windows_9.8 Win32-OpenSSH-GitHub pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to localhost:22 as 'Admin_1475'
debug3: record_hostkey: found key type RSA in file C:\\Users\\user/.ssh/known_hosts:2
debug3: load_hostkeys_file: loaded 1 keys from localhost
debug3: Failed to open file:C:/Users/user/.ssh/known_hosts2 error:2
debug1: load_hostkeys: fopen C:\\Users\\user/.ssh/known_hosts2: No such file or directory
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2
debug1: load_hostkeys: fopen __PROGRAMDATA__\\ssh/ssh_known_hosts: No such file or directory
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2
debug1: load_hostkeys: fopen __PROGRAMDATA__\\ssh/ssh_known_hosts2: No such file or directory
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],rsa-sha2-512,rsa-sha2-256
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,[email protected]
debug2: host key algorithms: [email protected],[email protected],rsa-sha2-512,rsa-sha2-256,[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]
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],hmac-sha2-256,hmac-sha2-512
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512
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,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-s,[email protected]
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256
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],hmac-sha2-256,hmac-sha2-512
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug3: kex_choose_conf: will use strict KEX ordering
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: rsa-sha2-512
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-rsa SHA256:t4QE3P3L8EgUfmtJJI3RPj3lcnRGiT5pu2LW9As6Ues
debug3: record_hostkey: found key type RSA in file C:\\Users\\user/.ssh/known_hosts:2
debug3: load_hostkeys_file: loaded 1 keys from localhost
debug3: Failed to open file:C:/Users/user/.ssh/known_hosts2 error:2
debug1: load_hostkeys: fopen C:\\Users\\user/.ssh/known_hosts2: No such file or directory
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2
debug1: load_hostkeys: fopen __PROGRAMDATA__\\ssh/ssh_known_hosts: No such file or directory
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2
debug1: load_hostkeys: fopen __PROGRAMDATA__\\ssh/ssh_known_hosts2: No such file or directory
debug1: Host 'localhost' is known and matches the RSA host key.
debug1: Found key in C:\\Users\\user/.ssh/known_hosts:2
debug3: send packet: type 21
debug1: ssh_packet_send2_wrapped: resetting send seqnr 3
debug2: ssh_set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: Sending SSH2_MSG_EXT_INFO
debug3: send packet: type 7
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: ssh_packet_read_poll2: resetting read seqnr 3
debug1: SSH2_MSG_NEWKEYS received
debug2: ssh_set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
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,[email protected]
debug2: host key algorithms: [email protected],[email protected],rsa-sha2-512,rsa-sha2-256,[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]
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],hmac-sha2-256,hmac-sha2-512
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512
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
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug3: kex_input_ext_info: extension server-sig-algs
debug1: kex_ext_info_client_parse: server-sig-algs=<ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],rsa-sha2-512,rsa-sha2-256>
debug3: kex_input_ext_info: extension [email protected]
debug1: kex_ext_info_check_ver: [email protected]=<0>
debug3: kex_input_ext_info: extension [email protected]
debug1: kex_ext_info_check_ver: [email protected]=<0>
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 7
debug1: SSH2_MSG_EXT_INFO received
debug3: kex_input_ext_info: extension server-sig-algs
debug1: kex_ext_info_client_parse: server-sig-algs=<ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],rsa-sha2-512,rsa-sha2-256>
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug3: start over, passed a different list publickey,password,keyboard-interactive
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
debug3: ssh_get_authentication_socket_path: path '\\\\.\\pipe\\openssh-ssh-agent'
debug2: get_agent_identities: ssh_agent_bind_hostkey: communication with agent failed
debug3: write ERROR from cb(2):232, io:00000226CDFB94E0
debug1: get_agent_identities: ssh_fetch_identitylist: communication with agent failed
debug1: Will attempt key: C:\\Users\\user/.ssh/id_rsa
debug1: Will attempt key: C:\\Users\\user/.ssh/id_ecdsa
debug1: Will attempt key: C:\\Users\\user/.ssh/id_ecdsa_sk
debug1: Will attempt key: C:\\Users\\user/.ssh/id_ed25519
debug1: Will attempt key: C:\\Users\\user/.ssh/id_ed25519_sk
debug1: Will attempt key: C:\\Users\\user/.ssh/id_xmss
debug2: pubkey_prepare: done
debug1: Trying private key: C:\\Users\\user/.ssh/id_rsa
debug3: no such identity: C:\\Users\\user/.ssh/id_rsa: No such file or directory
debug1: Trying private key: C:\\Users\\user/.ssh/id_ecdsa
debug3: no such identity: C:\\Users\\user/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: C:\\Users\\user/.ssh/id_ecdsa_sk
debug3: no such identity: C:\\Users\\user/.ssh/id_ecdsa_sk: No such file or directory
debug1: Trying private key: C:\\Users\\user/.ssh/id_ed25519
debug3: no such identity: C:\\Users\\user/.ssh/id_ed25519: No such file or directory
debug1: Trying private key: C:\\Users\\user/.ssh/id_ed25519_sk
debug3: no such identity: C:\\Users\\user/.ssh/id_ed25519_sk: No such file or directory
debug1: Trying private key: C:\\Users\\user/.ssh/id_xmss
debug3: no such identity: C:\\Users\\user/.ssh/id_xmss: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug3: send packet: type 50
debug2: we sent a keyboard-interactive packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug3: userauth_kbdint: disable: no info_req_seen
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred:
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
Admin_1475@localhost's password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 52
Authenticated to localhost ([::1]:22) using "password".
debug1: channel 0: new session [client-session] (inactive timeout: 0)
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: filesystem
debug3: client_repledge: enter
debug1: ENABLE_VIRTUAL_TERMINAL_INPUT is supported. Reading the VTSequence from console
debug3: This windows OS supports conpty
debug1: ENABLE_VIRTUAL_TERMINAL_PROCESSING is supported. Console supports the ansi parsing
debug3: Successfully set console output code page from:65001 to 65001
debug3: Successfully set console input code page from:437 to 65001
debug3: pselect: installing signal handler for 0, previous 00007FF628551370
debug3: pselect: installing signal handler for 3, previous 00007FF628571290
debug3: pselect: installing signal handler for 6, previous 00007FF628551370
debug3: pselect: installing signal handler for 7, previous 00007FF628551370
debug3: pselect: installing signal handler for 8, previous 00007FF628551370
debug3: pselect: installing signal handler for 11, previous 00007FF628551360
debug3: pselect_notify_setup: initializing
debug2: fd 9 setting O_NONBLOCK
debug2: fd 7 setting O_NONBLOCK
debug3: pselect_notify_setup: pid 3216 saved 3216 pipe0 9 pipe1 7
debug3: WSARecv - WSARecv() ERROR: io:00000226CDFB1150 10054
debug3: recv - from CB ERROR:108, io:00000226CDFB1150
Read from remote host localhost: Unknown error
Connection to localhost closed.
debug3: send packet: type 1
debug3: send - WSASend() ERROR:10054, io:00000226CDFB1150
client_loop: send disconnect: Connection reset
debug3: Successfully set console output code page from 65001 to 65001
debug3: Successfully set console input code page from 65001 to 437Here log from server.
But when I run sshd with the -d flag, the server shuts down at the stage when I try to connect, before the password is asked.
.\sshd.exe -f .\sshd_config_default -ddd
debug2: load_server_config: filename .\\sshd_config_default
debug2: load_server_config: done config len = 2164
debug2: parse_server_config_depth: config .\\sshd_config_default len 2164
debug3: .\\sshd_config_default:15 setting HostKey ssh_host_rsa_key
debug3: .\\sshd_config_default:39 setting AuthorizedKeysFile .ssh/authorized_keys
debug3: .\\sshd_config_default:79 setting Subsystem sftp sftp-server.exe
debug3: checking syntax for 'Match Group administrators'
debug1: sshd version OpenSSH_for_Windows_9.8 Win32-OpenSSH-GitHub, LibreSSL 4.0.0
debug1: private host key #0: ssh-rsa SHA256:t4QE3P3L8EgUfmtJJI3RPj3lcnRGiT5pu2LW9As6Ues
debug1: get_passwd: lookup_sid() failed: 1788.
debug1: rexec_argv[1]='-f'
debug1: rexec_argv[2]='.\\sshd_config_default'
debug1: rexec_argv[3]='-ddd'
debug3: using c:\\users\\admin_1475\\desktop\\ossh\\openssh-win64/sshd-session.exe for re-exec
debug2: fd 7 setting O_NONBLOCK
debug3: sock_set_v6only: set socket 7 IPV6_V6ONLY
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug2: fd 8 setting O_NONBLOCK
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug3: pselect: installing signal handler for 3, previous 00007FF66287F860
debug3: pselect: installing signal handler for 6, previous 00007FF66287F840
debug3: pselect: installing signal handler for 7, previous 00007FF66287F850
debug3: pselect: installing signal handler for 8, previous 00007FF66287F850
debug3: pselect_notify_setup: initializing
debug2: fd 11 setting O_NONBLOCK
debug2: fd 9 setting O_NONBLOCK
debug3: pselect_notify_setup: pid 12688 saved 12688 pipe0 11 pipe1 9
debug3: fd 10 is not O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: spawning "c:\\users\\admin_1475\\desktop\\ossh\\openssh-win64/sshd-session.exe" -f .\\sshd_config_default -ddd -R as subprocess
debug3: send_rexec_state: entering fd = 14 config len 2164
debug3: ssh_msg_send: type 0 len 3989
debug3: ssh_msg_send: done
debug3: send_rexec_state: doneEnvironment data
Name Value
---- -----
PSVersion 5.1.19041.3930
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.19041.3930
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1Version
OpenSSH_for_Windows_9.8p2 Win32-OpenSSH-GitHub, LibreSSL 4.0.0
Visuals
No response