Am exploring ssh on my el capitan laptop and have managed to get key-based login to work (using an account called adminuser). I now want to see if I can get another administrator account (called pwtest) to work using password-based login.
I've just discovered Match User and added it sshd_config but when I ssh and then enter the password I just get "Permission denied, please try again."
sshd_config:
# $OpenBSD: sshd_config,v 1.95 2015/04/27 21:42:48 djm Exp $ # This is the sshd server system-wide configuration file. See # sshd_config(5) for more information. # This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin # The strategy used for options in the default sshd_config shipped with # OpenSSH is to specify options with their default value where # possible, but leave them commented. Uncommented options override the # default value. # See sshd_config(5) for details on setting the Port and Listen values on Mac OS X #Port 22 #AddressFamily any #ListenAddress 0.0.0.0 #ListenAddress :: # The default requires explicit activation of protocol 1 #Protocol 2 # HostKey for protocol version 1 #HostKey /etc/ssh/ssh_host_key # HostKeys for protocol version 2 #HostKey /etc/ssh/ssh_host_rsa_key #HostKey /etc/ssh/ssh_host_dsa_key #HostKey /etc/ssh/ssh_host_ecdsa_key #HostKey /etc/ssh/ssh_host_ed25519_key # Lifetime and size of ephemeral version 1 server key #KeyRegenerationInterval 1h #ServerKeyBits 1024 # Ciphers and keying #RekeyLimit default none # Logging # obsoletes QuietMode and FascistLogging SyslogFacility AUTHPRIV #LogLevel INFO # Authentication: #LoginGraceTime 2m #PermitRootLogin no #StrictModes yes #MaxAuthTries 6 #MaxSessions 10 #RSAAuthentication yes #PubkeyAuthentication yes # The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2 # but this is overridden so installations will only check .ssh/authorized_keys AuthorizedKeysFile .ssh/authorized_keys #AuthorizedPrincipalsFile none #AuthorizedKeysCommand none #AuthorizedKeysCommandUser nobody # For this to work you will also need host keys in /etc/ssh/ssh_known_hosts #RhostsRSAAuthentication no # similar for protocol version 2 #HostbasedAuthentication no # Change to yes if you don't trust ~/.ssh/known_hosts for # RhostsRSAAuthentication and HostbasedAuthentication #IgnoreUserKnownHosts no # Don't read the user's ~/.rhosts and ~/.shosts files #IgnoreRhosts yes # To disable tunneled clear text passwords both PasswordAuthentication and # ChallengeResponseAuthentication must be set to "no". PasswordAuthentication no #PermitEmptyPasswords no # Change to no to disable s/key passwords ChallengeResponseAuthentication no # Kerberos options #KerberosAuthentication no #KerberosOrLocalPasswd yes #KerberosTicketCleanup yes #KerberosGetAFSToken no # GSSAPI options #GSSAPIAuthentication no #GSSAPICleanupCredentials yes #GSSAPIStrictAcceptorCheck yes #GSSAPIKeyExchange no # Set this to 'yes' to enable PAM authentication, account processing, # and session processing. If this is enabled, PAM authentication will # be allowed through the ChallengeResponseAuthentication and # PasswordAuthentication. Depending on your PAM configuration, # PAM authentication via ChallengeResponseAuthentication may bypass # the setting of "PermitRootLogin without-password". # If you just want the PAM account and session checks to run without # PAM authentication, then enable this but set PasswordAuthentication # and ChallengeResponseAuthentication to 'no'. # Also, PAM will deny null passwords by default. If you need to allow # null passwords, add the " nullok" option to the end of the # securityserver.so line in /etc/pam.d/sshd. UsePAM no #AllowAgentForwarding yes #AllowTcpForwarding yes #GatewayPorts no #X11Forwarding no #XauthLocation xauth # Default is to search $PATH (set by launchd(8)). It is recommended that a full path be provided. #X11DisplayOffset 10 #X11UseLocalhost yes #PermitTTY yes #PrintMotd yes #PrintLastLog yes #TCPKeepAlive yes #UseLogin no UsePrivilegeSeparation sandbox # Default for new installations. #PermitUserEnvironment no #Compression delayed #ClientAliveInterval 0 #ClientAliveCountMax 3 #UseDNS no #PidFile /var/run/sshd.pid #MaxStartups 10:30:100 #PermitTunnel no #ChrootDirectory none #VersionAddendum none # pass locale information AcceptEnv LANG LC_* # no default banner path #Banner none # override default of no subsystems Subsystem sftp /usr/libexec/sftp-server # Example of overriding settings on a per-user basis #Match User anoncvs # X11Forwarding no # AllowTcpForwarding no # PermitTTY no # ForceCommand cvs server Match User pwtest PasswordAuthentication yes ssh -vv output:
Unknown-58-b0-35-63-5c-67:~ davidpark$ ssh -vv OpenSSH_6.9p1, LibreSSL 2.1.7 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 20: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to dplaptop.local [fe80::5ab0:35ff:fe63:5c67%en1] port 22. debug1: Connection established. debug1: key_load_public: No such file or directory debug1: identity file /Users/davidpark/.ssh/id_rsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/davidpark/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/davidpark/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/davidpark/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/davidpark/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/davidpark/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/davidpark/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/davidpark/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.9 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.9 debug1: match: OpenSSH_6.9 pat OpenSSH* compat 0x04000000 debug2: fd 5 setting O_NONBLOCK debug1: Authenticating to dplaptop.local:22 as 'pwtest' debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: ,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ,,,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,,,,,,ssh-ed25519,ssh-rsa,ssh-dss debug2: kex_parse_kexinit: ,aes128-ctr,aes192-ctr,aes256-ctr,,,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour, debug2: kex_parse_kexinit: ,aes128-ctr,aes192-ctr,aes256-ctr,,,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour, debug2: kex_parse_kexinit: ,,,,,,,hmac-sha2-256,hmac-sha2-512,hmac-sha1,,,,,hmac-md5,hmac-ripemd160,,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: ,,,,,,,hmac-sha2-256,hmac-sha2-512,hmac-sha1,,,,,hmac-md5,hmac-ripemd160,,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,,zlib debug2: kex_parse_kexinit: none,,zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: ,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 debug2: kex_parse_kexinit: ,aes128-ctr,aes192-ctr,aes256-ctr,, debug2: kex_parse_kexinit: ,aes128-ctr,aes192-ctr,aes256-ctr,, debug2: kex_parse_kexinit: ,,,,,,,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: kex_parse_kexinit: ,,,,,,,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: kex_parse_kexinit: none, debug2: kex_parse_kexinit: none, debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug1: kex: server->client <implicit> none debug1: kex: client->server <implicit> none debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ecdsa-sha2-nistp256 SHA256:pZ9I3OlB5kUmeKHq4PWADSigAPIAmO7VWK10Pn5Vau4 debug1: Host 'dplaptop.local' is known and matches the ECDSA host key. debug1: Found key in /Users/davidpark/.ssh/known_hosts:1 debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /Users/davidpark/.ssh/id_rsa (0x0), debug2: key: /Users/davidpark/.ssh/id_dsa (0x0), debug2: key: /Users/davidpark/.ssh/id_ecdsa (0x0), debug2: key: /Users/davidpark/.ssh/id_ed25519 (0x0), debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/davidpark/.ssh/id_rsa debug2: we sent a publickey packet, wait for reply debug1: Authentications that can continue: publickey,password debug1: Trying private key: /Users/davidpark/.ssh/id_dsa debug1: Trying private key: /Users/davidpark/.ssh/id_ecdsa debug1: Trying private key: /Users/davidpark/.ssh/id_ed25519 debug2: we did not send a packet, disable method debug1: Next authentication method: password 's password: debug2: we sent a password packet, wait for reply debug1: Authentications that can continue: publickey,password Permission denied, please try again. 's password: debug2: we sent a password packet, wait for reply debug1: Authentications that can continue: publickey,password Permission denied, please try again. 's password: debug2: we sent a password packet, wait for reply debug1: Authentications that can continue: publickey,password debug2: we did not send a packet, disable method debug1: No more authentication methods to try. Permission denied (publickey,password). ssh_config:
# $OpenBSD: ssh_config,v 1.28 2013/09/16 11:35:43 sthen Exp $ # This is the ssh client system-wide configuration file. See # ssh_config(5) for more information. This file provides defaults for # users, and the values can be changed in per-user configuration files # or on the command line. # Configuration data is parsed as follows: # 1. command line options # 2. user-specific file # 3. system-wide file # Any configuration value is only changed the first time it is set. # Thus, host-specific definitions should be at the beginning of the # configuration file, and defaults at the end. # Site-wide defaults for some commonly used options. For a comprehensive # list of available options, their meanings and defaults, please see the # ssh_config(5) man page. # Apple: Host * SendEnv LANG LC_* # AskPassGUI yes # ForwardAgent no # ForwardX11 no # RhostsRSAAuthentication no # RSAAuthentication yes # PasswordAuthentication no # HostbasedAuthentication yes # GSSAPIAuthentication no # GSSAPIDelegateCredentials no # BatchMode no # CheckHostIP yes # AddressFamily any # ConnectTimeout 0 # StrictHostKeyChecking ask # IdentityFile ~/.ssh/identity # IdentityFile ~/.ssh/id_rsa # IdentityFile ~/.ssh/id_dsa # Port 22 # Protocol 2,1 # Cipher 3des # Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc # MACs hmac-md5,hmac-sha1,,hmac-ripemd160 # EscapeChar ~ # Tunnel no # TunnelDevice any:any # PermitLocalCommand no # VisualHostKey no # ProxyCommand ssh -q -W %h:%p gateway.example.com # RekeyLimit 1G 1h system.log content:
Nov 9 15:07:28 Unknown-58-b0-35-63-5c-67 sshd[1868]: Failed password for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49985 ssh2 Nov 9 15:07:51 --- last message repeated 2 times --- Nov 9 15:07:51 Unknown-58-b0-35-63-5c-67 sshd[1868]: Connection closed by fe80::5ab0:35ff:fe63:5c67%en1 [preauth] Nov 9 15:07:51 Unknown-58-b0-35-63-5c-67 com.apple.xpc.launchd[1] (com.openssh.sshd.CC0FA77D-7484-4138-96BA-7BC748771FA1[1868]): Service exited with abnormal code: 255 Following @Otheus suggestions:
When I use a plain vanilla sshd_config file i.e. sudo /usr/sbin/sshd -D -d -f /etc/ssh/sshd_config.plain -p 2020 I can successfully ssh -p 2020 - see debug output below:
... debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth] debug1: SSH2_MSG_NEWKEYS sent [preauth] debug1: expecting SSH2_MSG_NEWKEYS [preauth] debug1: SSH2_MSG_NEWKEYS received [preauth] debug1: KEX done [preauth] debug1: userauth-request for user pwtest service ssh-connection method none [preauth] debug1: attempt 0 failures 0 [preauth] debug1: PAM: initializing for "pwtest" debug1: PAM: setting PAM_RHOST to "fe80::5ab0:35ff:fe63:5c67%en1" debug1: userauth-request for user pwtest service ssh-connection method publickey [preauth] debug1: attempt 1 failures 0 [preauth] debug1: temporarily_use_uid: 503/20 (e=0/0) debug1: trying public key file /Users/pwtest/.ssh/authorized_keys debug1: Could not open authorized keys '/Users/pwtest/.ssh/authorized_keys': No such file or directory debug1: restore_uid: 0/0 Failed publickey for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49288 ssh2: RSA SHA256:Y4oh+ZwNsE9hrnD+kCGYUkl48TypV0oQxXi9osTozE4 debug1: audit_event: unhandled event 6 debug1: userauth-request for user pwtest service ssh-connection method keyboard-interactive [preauth] debug1: attempt 2 failures 1 [preauth] debug1: keyboard-interactive devs [preauth] debug1: auth2_challenge: user=pwtest devs= [preauth] debug1: kbdint_alloc: devices 'pam' [preauth] debug1: auth2_challenge_start: trying authentication method 'pam' [preauth] Postponed keyboard-interactive for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49288 ssh2: RSA SHA256:Y4oh+ZwNsE9hrnD+kCGYUkl48TypV0oQxXi9osTozE4 [preauth] debug1: do_pam_account: called debug1: PAM: num PAM env strings 2 Postponed keyboard-interactive/pam for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49288 ssh2 [preauth] debug1: do_pam_account: called Accepted keyboard-interactive/pam for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49288 ssh2 debug1: monitor_child_preauth: pwtest has been authenticated by privileged process debug1: monitor_read_log: child log fd closed debug1: PAM: establishing credentials User child is on pid 473 debug1: PAM: establishing credentials debug1: permanently_set_uid: 503/20 debug1: ssh_packet_set_postauth: called debug1: Entering interactive session for SSH2. debug1: server_init_dispatch_20 debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384 debug1: input_session_request debug1: channel 0: new [server-session] debug1: session_new: session 0 debug1: session_open: channel 0 debug1: session_open: session 0: link with channel 0 debug1: server_input_channel_open: confirm session debug1: server_input_global_request: rtype want_reply 0 debug1: server_input_channel_req: channel 0 request pty-req reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req pty-req debug1: Allocating pty. debug1: session_new: session 0 debug1: session_pty_req: session 0 alloc /dev/ttys002 debug1: server_input_channel_req: channel 0 request env reply 0 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req env debug1: server_input_channel_req: channel 0 request shell reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req shell Starting session: shell on ttys002 for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49288 debug1: Setting controlling tty using TIOCSCTTY. But when I use my modified ssh_config sudo /usr/sbin/sshd -D -d -f /etc/ssh/sshd_config -p 2020, ssh -p 2020 doesn't work - debug output below:
... debug1: Client protocol version 2.0; client software version OpenSSH_6.9 debug1: match: OpenSSH_6.9 pat OpenSSH* compat 0x04000000 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.9 debug1: permanently_set_uid: 75/75 [preauth] debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 [preauth] debug1: SSH2_MSG_KEXINIT sent [preauth] debug1: SSH2_MSG_KEXINIT received [preauth] debug1: kex: client->server <implicit> none [preauth] debug1: kex: server->client <implicit> none [preauth] debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth] debug1: SSH2_MSG_NEWKEYS sent [preauth] debug1: expecting SSH2_MSG_NEWKEYS [preauth] debug1: SSH2_MSG_NEWKEYS received [preauth] debug1: KEX done [preauth] debug1: userauth-request for user pwtest service ssh-connection method none [preauth] debug1: attempt 0 failures 0 [preauth] debug1: user pwtest matched 'User pwtest' at line 146 debug1: userauth-request for user pwtest service ssh-connection method publickey [preauth] debug1: attempt 1 failures 0 [preauth] debug1: temporarily_use_uid: 503/20 (e=0/0) debug1: trying public key file /Users/pwtest/.ssh/authorized_keys debug1: Could not open authorized keys '/Users/pwtest/.ssh/authorized_keys': No such file or directory debug1: restore_uid: 0/0 Failed publickey for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49290 ssh2: RSA SHA256:Y4oh+ZwNsE9hrnD+kCGYUkl48TypV0oQxXi9osTozE4 debug1: audit_event: unhandled event 6 debug1: userauth-request for user pwtest service ssh-connection method password [preauth] debug1: attempt 2 failures 1 [preauth] Failed password for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49290 ssh2 debug1: userauth-request for user pwtest service ssh-connection method password [preauth] debug1: attempt 3 failures 2 [preauth] Failed password for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49290 ssh2 debug1: userauth-request for user pwtest service ssh-connection method password [preauth] debug1: attempt 4 failures 3 [preauth] Failed password for pwtest from fe80::5ab0:35ff:fe63:5c67%en1 port 49290 ssh2 Connection closed by fe80::5ab0:35ff:fe63:5c67%en1 [preauth] debug1: do_cleanup [preauth] debug1: monitor_read_log: child log fd closed debug1: do_cleanup debug1: Killing privsep child 497 debug1: audit_event: unhandled event 12 1 Answer
See @Otheus comments for the solution - in order to have one user use key login and another user (pwtest) password login, the relevant parameters in /etc/ssh/sshd_config are below. Previously I had UsePAM no and when pwtest entered their password they would get the message: Permission denied, please try again.
ChallengeResponseAuthentication no PasswordAuthentication no UsePAM yes UsePrivilegeSeparation sandbox # default setting Match User pwtest PasswordAuthentication yes 
