Bug#237392: sshd priv. seperated process get in infinite loop on logout
On Thu, Mar 11, 2004 at 04:12:36PM +0100, sjoerd wrote:
> On Thu, Mar 11, 2004 at 01:25:42PM +0000, Matthew Vernon wrote:
> > tags 237392 moreinfo
> > quit
> >
> > > We use pam-ldap for authentication. When logging out of an ssh
> > > connection, the sshd process running as user gets stuck in an
> > > infinite loop. The connection of the user is closed nicely, but
> > > his sshd is stuck.
> >
> > Can you provide sshd -ddd output from such a session, please?
>
> It's attached with this mail
Ofcourse i forgot the attachment :(
Sjoerd
--
When the weight of the paperwork equals the weight of the plane, the
plane will fly.
-- Donald Douglas
debug2: read_server_config: filename /etc/ssh/sshd_config
debug1: sshd version OpenSSH_3.8p1 Debian 1:3.8p1-2
debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key.
debug1: read PEM private key done: type RSA
debug1: private host key: #0 type 1 RSA
debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key.
debug1: read PEM private key done: type DSA
debug1: private host key: #1 type 2 DSA
debug1: Bind to port 3022 on ::.
Server listening on :: port 3022.
debug1: Bind to port 3022 on 0.0.0.0.
debug1: Server will not fork when running in debugging mode.
Connection from 2001:888:1d84:0:201:2ff:fee1:4c19 port 55048
debug1: Client protocol version 2.0; client software version OpenSSH_3.8p1 Debian 1:3.8p1-2
debug1: match: OpenSSH_3.8p1 Debian 1:3.8p1-2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8p1 Debian 1:3.8p1-2
debug2: Network child is on pid 14851
debug3: preauth child monitor started
debug3: mm_request_receive entering
debug3: privsep user:group 100:65534
debug1: permanently_set_uid: 100/65534
debug1: list_hostkey_types: ssh-rsa,ssh-dss
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,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: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,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: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received
debug3: mm_request_send entering: type 0
debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI
debug3: mm_request_receive_expect entering: type 1
debug3: mm_request_receive entering
debug3: monitor_read: checking request 0
debug3: mm_answer_moduli: got parameters: 1024 1024 8192
debug3: mm_request_send entering: type 1
debug2: monitor_read: 0 used once, disabling now
debug3: mm_request_receive entering
debug3: mm_choose_dh: remaining 0
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
debug2: dh_gen_key: priv key bits set: 125/256
debug2: bits set: 522/1024
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
debug2: bits set: 493/1024
debug3: mm_key_sign entering
debug3: mm_request_send entering: type 4
debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN
debug3: mm_request_receive_expect entering: type 5
debug3: mm_request_receive entering
debug3: monitor_read: checking request 4
debug3: mm_answer_sign
debug3: mm_answer_sign: signature 0x8097210(143)
debug3: mm_request_send entering: type 5
debug2: monitor_read: 4 used once, disabling now
debug3: mm_request_receive entering
debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent
debug2: kex_derive_keys
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: KEX done
debug1: userauth-request for user sjoerd service ssh-connection method none
debug1: attempt 0 failures 0
debug3: mm_getpwnamallow entering
debug3: mm_request_send entering: type 6
debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM
debug3: mm_request_receive_expect entering: type 7
debug3: mm_request_receive entering
debug3: monitor_read: checking request 6
debug3: mm_answer_pwnamallow
debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
debug3: mm_request_send entering: type 7
debug2: monitor_read: 6 used once, disabling now
debug3: mm_request_receive entering
debug2: input_userauth_request: setting up authctxt for sjoerd
debug3: mm_start_pam entering
debug3: mm_request_send entering: type 45
debug3: mm_inform_authserv entering
debug3: mm_request_send entering: type 3
debug2: input_userauth_request: try method none
debug3: mm_auth_password entering
debug3: mm_request_send entering: type 10
debug3: mm_auth_password: waiting for MONITOR_ANS_AUTHPASSWORD
debug3: mm_request_receive_expect entering: type 11
debug3: mm_request_receive entering
debug3: monitor_read: checking request 45
debug1: PAM: initializing for "sjoerd"
debug3: Trying to reverse map address 2001:888:1d84:0:201:2ff:fee1:4c19.
debug1: PAM: setting PAM_RHOST to "beast.ipv6.luon.net"
debug1: PAM: setting PAM_TTY to "ssh"
debug2: monitor_read: 45 used once, disabling now
debug3: mm_request_receive entering
debug3: monitor_read: checking request 3
debug3: mm_answer_authserv: service=ssh-connection, style=
debug2: monitor_read: 3 used once, disabling now
debug3: mm_request_receive entering
debug3: monitor_read: checking request 10
debug3: mm_answer_authpassword: sending result 0
debug3: mm_request_send entering: type 11
Failed none for sjoerd from 2001:888:1d84:0:201:2ff:fee1:4c19 port 55048 ssh2
debug3: mm_request_receive entering
debug3: mm_auth_password: user not authenticated
Failed none for sjoerd from 2001:888:1d84:0:201:2ff:fee1:4c19 port 55048 ssh2
debug1: userauth-request for user sjoerd service ssh-connection method publickey
debug1: attempt 1 failures 1
debug2: input_userauth_request: try method publickey
debug1: test whether pkalg/pkblob are acceptable
debug3: mm_key_allowed entering
debug3: mm_request_send entering: type 20
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED
debug3: mm_request_receive_expect entering: type 21
debug3: mm_request_receive entering
debug3: monitor_read: checking request 20
debug3: mm_answer_keyallowed entering
debug3: mm_answer_keyallowed: key_from_blob: 0x8096388
debug1: temporarily_use_uid: 2001/2001 (e=0/0)
debug1: trying public key file /home/sjoerd/.ssh/authorized_keys
debug3: secure_filename: checking '/home/sjoerd/.ssh'
debug3: secure_filename: checking '/home/sjoerd'
debug3: secure_filename: terminating check at '/home/sjoerd'
debug1: matching key found: file /home/sjoerd/.ssh/authorized_keys, line 2
Found matching RSA key: 63:cf:77:14:e1:b8:81:14:f7:05:c4:05:20:59:2f:94
debug1: restore_uid: 0/0
debug3: mm_answer_keyallowed: key 0x8096388 is allowed
debug3: mm_request_send entering: type 21
debug3: mm_request_receive entering
debug2: userauth_pubkey: authenticated 0 pkalg ssh-rsa
Postponed publickey for sjoerd from 2001:888:1d84:0:201:2ff:fee1:4c19 port 55048 ssh2
debug1: userauth-request for user sjoerd service ssh-connection method publickey
debug1: attempt 2 failures 1
debug2: input_userauth_request: try method publickey
debug3: mm_key_allowed entering
debug3: mm_request_send entering: type 20
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED
debug3: mm_request_receive_expect entering: type 21
debug3: mm_request_receive entering
debug3: monitor_read: checking request 20
debug3: mm_answer_keyallowed entering
debug3: mm_answer_keyallowed: key_from_blob: 0x80daa58
debug1: temporarily_use_uid: 2001/2001 (e=0/0)
debug1: trying public key file /home/sjoerd/.ssh/authorized_keys
debug3: secure_filename: checking '/home/sjoerd/.ssh'
debug3: secure_filename: checking '/home/sjoerd'
debug3: secure_filename: terminating check at '/home/sjoerd'
debug1: matching key found: file /home/sjoerd/.ssh/authorized_keys, line 2
Found matching RSA key: 63:cf:77:14:e1:b8:81:14:f7:05:c4:05:20:59:2f:94
debug1: restore_uid: 0/0
debug3: mm_answer_keyallowed: key 0x80daa58 is allowed
debug3: mm_request_send entering: type 21
debug3: mm_request_receive entering
debug3: mm_key_verify entering
debug3: mm_request_send entering: type 22
debug3: mm_key_verify: waiting for MONITOR_ANS_KEYVERIFY
debug3: mm_request_receive_expect entering: type 23
debug3: mm_request_receive entering
debug3: monitor_read: checking request 22
debug1: ssh_rsa_verify: signature correct
debug3: mm_answer_keyverify: key 0x8096298 signature verified
debug3: mm_request_send entering: type 23
debug3: mm_request_receive_expect entering: type 46
debug3: mm_request_receive entering
debug2: userauth_pubkey: authenticated 1 pkalg ssh-rsa
debug3: mm_do_pam_account entering
debug3: mm_request_send entering: type 46
debug3: mm_request_receive_expect entering: type 47
debug3: mm_request_receive entering
debug3: PAM: do_pam_account pam_acct_mgmt = 0
debug3: mm_request_send entering: type 47
Accepted publickey for sjoerd from 2001:888:1d84:0:201:2ff:fee1:4c19 port 55048 ssh2
debug1: monitor_child_preauth: sjoerd has been authenticated by privileged process
debug3: mm_get_keystate: Waiting for new keys
debug3: mm_request_receive_expect entering: type 24
debug3: mm_request_receive entering
debug3: mm_do_pam_account returning 1
Accepted publickey for sjoerd from 2001:888:1d84:0:201:2ff:fee1:4c19 port 55048 ssh2
debug3: mm_send_keystate: Sending new keys: 0x8097028 0x8096930
debug3: mm_newkeys_to_blob: converting 0x8097028
debug3: mm_newkeys_to_blob: converting 0x8096930
debug3: mm_send_keystate: New keys have been sent
debug3: mm_send_keystate: Sending compression state
debug3: mm_request_send entering: type 24
debug3: mm_send_keystate: Finished sending state
debug3: mm_newkeys_from_blob: 0x80ddea0(118)
debug2: mac_init: found hmac-md5
debug3: mm_get_keystate: Waiting for second key
debug3: mm_newkeys_from_blob: 0x80ddea0(118)
debug2: mac_init: found hmac-md5
debug3: mm_get_keystate: Getting compression state
debug3: mm_get_keystate: Getting Network I/O buffers
debug3: mm_share_sync: Share sync
debug3: mm_share_sync: Share sync end
debug2: User child is on pid 14852
debug3: mm_request_receive entering
debug3: PAM: opening session
debug1: PAM: reinitializing credentials
debug1: permanently_set_uid: 2001/2001
debug2: set_newkeys: mode 0
debug2: set_newkeys: mode 1
debug1: Entering interactive session for SSH2.
debug2: fd 10 setting O_NONBLOCK
debug2: fd 12 setting O_NONBLOCK
debug1: server_init_dispatch_20
debug1: server_input_channel_open: ctype session rchan 0 win 65536 max 16384
debug1: input_session_request
debug1: channel 0: new [server-session]
debug1: session_new: init
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_channel_req: channel 0 request pty-req reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req pty-req
debug1: Allocating pty.
debug3: mm_request_send entering: type 25
debug3: monitor_read: checking request 25
debug3: mm_answer_pty entering
debug1: session_new: init
debug1: session_new: session 0
debug3: mm_pty_allocate: waiting for MONITOR_ANS_PTY
debug3: mm_request_receive_expect entering: type 26
debug3: mm_request_receive entering
debug3: mm_request_send entering: type 26
debug3: mm_answer_pty: tty /dev/pts/3 ptyfd 8
debug3: mm_request_receive entering
debug1: session_pty_req: session 0 alloc /dev/pts/3
debug3: tty_parse_modes: SSH2 n_bytes 256
debug3: tty_parse_modes: ospeed 38400
debug3: tty_parse_modes: ispeed 38400
debug3: tty_parse_modes: 1 3
debug3: tty_parse_modes: 2 28
debug3: tty_parse_modes: 3 127
debug3: tty_parse_modes: 4 21
debug3: tty_parse_modes: 5 4
debug3: tty_parse_modes: 6 0
debug3: tty_parse_modes: 7 0
debug3: tty_parse_modes: 8 17
debug3: tty_parse_modes: 9 19
debug3: tty_parse_modes: 10 26
debug3: tty_parse_modes: 12 18
debug3: tty_parse_modes: 13 23
debug3: tty_parse_modes: 14 22
debug3: tty_parse_modes: 18 15
debug3: tty_parse_modes: 30 1
debug3: tty_parse_modes: 31 0
debug3: tty_parse_modes: 32 0
debug3: tty_parse_modes: 33 0
debug3: tty_parse_modes: 34 0
debug3: tty_parse_modes: 35 0
debug3: tty_parse_modes: 36 1
debug3: tty_parse_modes: 37 0
debug3: tty_parse_modes: 38 1
debug3: tty_parse_modes: 39 0
debug3: tty_parse_modes: 40 0
debug3: tty_parse_modes: 41 1
debug3: tty_parse_modes: 50 1
debug3: tty_parse_modes: 51 1
debug3: tty_parse_modes: 52 0
debug3: tty_parse_modes: 53 1
debug3: tty_parse_modes: 54 1
debug3: tty_parse_modes: 55 1
debug3: tty_parse_modes: 56 0
debug3: tty_parse_modes: 57 0
debug3: tty_parse_modes: 58 0
debug3: tty_parse_modes: 59 1
debug3: tty_parse_modes: 60 1
debug3: tty_parse_modes: 61 1
debug3: tty_parse_modes: 62 0
debug3: tty_parse_modes: 70 1
debug3: tty_parse_modes: 71 0
debug3: tty_parse_modes: 72 1
debug3: tty_parse_modes: 73 0
debug3: tty_parse_modes: 74 0
debug3: tty_parse_modes: 75 0
debug3: tty_parse_modes: 90 1
debug3: tty_parse_modes: 91 1
debug3: tty_parse_modes: 92 0
debug3: tty_parse_modes: 93 0
debug1: server_input_channel_req: channel 0 request x11-req reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req x11-req
debug2: bind port 6010: Address already in use
debug2: bind port 6010: Address already in use
debug2: fd 15 setting O_NONBLOCK
debug2: fd 15 is O_NONBLOCK
debug1: channel 1: new [X11 inet listener]
debug2: fd 16 setting O_NONBLOCK
debug2: fd 16 is O_NONBLOCK
debug1: channel 2: new [X11 inet listener]
debug1: server_input_channel_req: channel 0 request shell reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req shell
debug1: PAM: setting PAM_TTY to "/dev/pts/3"
debug2: fd 4 setting TCP_NODELAY
debug2: channel 0: rfd 14 isatty
debug2: fd 14 setting O_NONBLOCK
debug2: fd 13 is O_NONBLOCK
debug1: Setting controlling tty using TIOCSCTTY.
debug2: channel 0: read<=0 rfd 14 len -1
debug2: channel 0: read failed
debug2: channel 0: close_read
debug2: channel 0: input open -> drain
debug2: channel 0: ibuf empty
debug2: channel 0: send eof
debug2: channel 0: input drain -> closed
debug1: Received SIGCHLD.
debug1: session_by_pid: pid 14853
debug1: session_exit_message: session 0 channel 0 pid 14853
debug2: channel 0: request exit-status
debug1: session_exit_message: release channel 0
debug2: channel 0: write failed
debug2: channel 0: close_write
debug2: channel 0: output open -> closed
debug1: session_close: session 0 pid 14853
debug3: mm_request_send entering: type 27
debug2: channel 0: send close
debug3: channel 0: will not send data after close
debug2: notify_done: reading
debug3: channel 0: will not send data after close
debug3: monitor_read: checking request 27
debug3: mm_answer_pty_cleanup entering
debug1: session_by_tty: session 0 tty /dev/pts/3
debug3: mm_session_close: session 0 pid 14852
debug3: mm_session_close: tty /dev/pts/3 ptyfd 8
debug1: session_pty_cleanup: session 0 release /dev/pts/3
debug3: mm_request_receive entering
debug2: channel 0: rcvd close
debug3: channel 0: will not send data after close
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: server-session, nchannels 3
debug3: channel 0: status: The following connections are open:
#0 server-session (t4 r0 i3/0 o3/0 fd -1/-1)
debug3: channel 0: close_fds r -1 w -1 e -1
Connection closed by 2001:888:1d84:0:201:2ff:fee1:4c19
debug1: channel 1: free: X11 inet listener, nchannels 2
debug3: channel 1: status: The following connections are open:
debug3: channel 1: close_fds r 15 w 15 e -1
debug1: channel 2: free: X11 inet listener, nchannels 1
debug3: channel 2: status: The following connections are open:
debug3: channel 2: close_fds r 16 w 16 e -1
debug1: do_cleanup
debug1: PAM: cleanup
debug3: PAM: sshpam_thread_cleanup entering
Closing connection to 2001:888:1d84:0:201:2ff:fee1:4c19
debug1: PAM: cleanup
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