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ID Category Severity Reproducibility Date Submitted Last Update
0005173 [openssh] other major always 2014-05-22 15:11 2014-10-18 14:59
Reporter schwindt View Status public  
Assigned To yann
Priority normal Resolution open  
Status assigned  
Summary 0005173: Bug in sshd when using ed25519 keys
Description Remember me reporting ed25519 keys not being generated ?
If only I had kept my mouth shut .)

The keys get generated but they can't be used.
On setting up a fresh machine, which consequently did not have the rsa host key,
I was not able to connect to a machine having an ed25519 hostkey.

Removing the key from the server and knownhosts, modifying /opt/csw/sbin/sshd.smf_wrapper not to generate keys,
restarting sshd -> everything changes back to normal.

This happens for solaris clients as well as e.g. archlinux clients.
Additional Information
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-  Notes
(0010856)
yann (manager)
2014-06-10 17:15

Hi Schwindt,

I just tried but wasn't able to reproduce the problem.
Could you launch the ssh daemon and the client in debug mode ("/opt/csw/sbin/sshd -d -d -d" for the daemon, ssh -v -v -v for the client) and send me the log output when it fails ?

Thanks in advance,

Yann
(0010859)
schwindt (reporter)
2014-06-11 10:58

I will try to do that later on this day.

Did you remove the original rsa-pubkey of the target server from your .ssh/known_hosts ? As long as this old key is in place, no new pubkey is requested and everything will work.
(0010860)
schwindt (reporter)
2014-06-11 11:40

The server :

schwindt@isg-1505 [/home/schwindt] /opt/csw/sbin/sshd -p 1025 -d -d -d
debug2: load_server_config: filename /etc/opt/csw/ssh/sshd_config
debug2: load_server_config: done config len = 289
debug2: parse_server_config: config /etc/opt/csw/ssh/sshd_config len 289
debug3: /etc/opt/csw/ssh/sshd_config:54 setting AuthorizedKeysFile .ssh/authorized_keys
debug3: /etc/opt/csw/ssh/sshd_config:99 setting UsePAM yes
debug3: /etc/opt/csw/ssh/sshd_config:104 setting X11Forwarding yes
debug3: /etc/opt/csw/ssh/sshd_config:108 setting PrintMotd no
debug3: /etc/opt/csw/ssh/sshd_config:112 setting UsePrivilegeSeparation sandbox
debug3: /etc/opt/csw/ssh/sshd_config:128 setting Subsystem sftp /opt/csw/libexec/sftp-server
debug1: sshd version OpenSSH_6.6, OpenSSL 1.0.1g 7 Apr 2014
debug3: Incorrect RSA1 identifier
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type RSA
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/opt/csw/ssh/ssh_host_rsa_key" as a RSA1 public key
debug1: private host key: #0 type 1 RSA
debug3: Incorrect RSA1 identifier
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/opt/csw/ssh/ssh_host_dsa_key" as a RSA1 public key
debug1: private host key: 0000001 type 2 DSA
debug3: Incorrect RSA1 identifier
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type RSA
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/opt/csw/ssh/ssh_host_ecdsa_key" as a RSA1 public key
debug1: private host key: 0000002 type 1 RSA
debug3: Incorrect RSA1 identifier
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/opt/csw/ssh/ssh_host_ed25519_key" as a RSA1 public key
debug1: private host key: 0000003 type 4 ED25519
debug1: rexec_argv[0]='/opt/csw/sbin/sshd'
debug1: rexec_argv[1]='-p'
debug1: rexec_argv[2]='1025'
debug1: rexec_argv[3]='-d'
debug1: rexec_argv[4]='-d'
debug1: rexec_argv[5]='-d'
debug2: fd 4 setting O_NONBLOCK
debug3: sock_set_v6only: set socket 4 IPV6_V6ONLY
debug1: Bind to port 1025 on ::.
Server listening on :: port 1025.
debug2: fd 5 setting O_NONBLOCK
debug1: Bind to port 1025 on 0.0.0.0.
Server listening on 0.0.0.0 port 1025.
debug1: fd 6 clearing O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 11 config len 289
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug1: rexec start in 6 out 6 newsock 6 pipe -1 sock 11
debug1: inetd sockets after dupping: 4, 4
Connection from 192.168.15.105 port 50700 on 192.168.15.105 port 1025
debug1: Client protocol version 2.0; client software version OpenSSH_6.6
debug1: match: OpenSSH_6.6 pat OpenSSH* compat 0x04000000
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6
debug2: fd 4 setting O_NONBLOCK
debug2: Network child is on pid 28142
debug3: preauth child monitor started
debug3: privsep user:group 60003:60003 [preauth]
debug1: permanently_set_uid: 60003/60003 [preauth]
debug1: list_hostkey_types: ssh-rsa,ssh-dss,ssh-rsa,ssh-ed25519 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,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 [preauth]
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ssh-rsa,ssh-ed25519 [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se [preauth]
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: none,zlib@openssh.com [preauth]
debug2: kex_parse_kexinit: none,zlib@openssh.com [preauth]
debug2: kex_parse_kexinit: [preauth]
debug2: kex_parse_kexinit: [preauth]
debug2: kex_parse_kexinit: first_kex_follows 0 [preauth]
debug2: kex_parse_kexinit: reserved 0 [preauth]
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,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 [preauth]
debug2: kex_parse_kexinit: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa,ssh-dss [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se [preauth]
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib [preauth]
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib [preauth]
debug2: kex_parse_kexinit: [preauth]
debug2: kex_parse_kexinit: [preauth]
debug2: kex_parse_kexinit: first_kex_follows 0 [preauth]
debug2: kex_parse_kexinit: reserved 0 [preauth]
debug2: mac_setup: setup hmac-md5-etm@openssh.com [preauth]
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none [preauth]
debug2: mac_setup: setup hmac-md5-etm@openssh.com [preauth]
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug3: mm_key_sign entering [preauth]
debug3: mm_request_send entering: type 6 [preauth]
debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN [preauth]
debug3: mm_request_receive_expect entering: type 7 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 6
debug3: mm_answer_sign
debug3: mm_answer_sign: signature 812e1f8(83)
debug3: mm_request_send entering: type 7
debug2: monitor_read: 6 used once, disabling now
debug2: kex_derive_keys [preauth]
debug2: set_newkeys: mode 1 [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
Connection closed by 192.168.15.105 [preauth]
debug1: do_cleanup [preauth]
debug3: PAM: sshpam_thread_cleanup entering [preauth]
debug3: mm_request_receive entering
debug1: do_cleanup
debug3: PAM: sshpam_thread_cleanup entering
debug1: Killing privsep child 28142
(0010861)
schwindt (reporter)
2014-06-11 11:44

The client :

schwindt@isg-1505 [/home/schwindt] ssh -p 1025 isg-1505 -v -v -v
OpenSSH_6.6, OpenSSL 1.0.1g 7 Apr 2014
debug1: Reading configuration data /home/schwindt/.ssh/config
debug1: Reading configuration data /etc/opt/csw/ssh/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to isg-1505 [192.168.15.105] port 1025.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/schwindt/.ssh/id_rsa" as a RSA1 public key
debug1: identity file /home/schwindt/.ssh/id_rsa type 1
debug1: identity file /home/schwindt/.ssh/id_rsa-cert type -1
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/schwindt/.ssh/id_dsa" as a RSA1 public key
debug1: identity file /home/schwindt/.ssh/id_dsa type 2
debug1: identity file /home/schwindt/.ssh/id_dsa-cert type -1
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/schwindt/.ssh/id_ecdsa" as a RSA1 public key
debug1: identity file /home/schwindt/.ssh/id_ecdsa type 3
debug1: identity file /home/schwindt/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/schwindt/.ssh/id_ed25519 type -1
debug1: identity file /home/schwindt/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6
debug1: match: OpenSSH_6.6 pat OpenSSH* compat 0x04000000
debug2: fd 4 setting O_NONBLOCK
debug3: put_host_port: [isg-1505]:1025
debug3: load_hostkeys: loading entries for host "[isg-1505]:1025" from file "/home/schwindt/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,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-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,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-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,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: curve25519-sha256@libssh.org,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: ssh-rsa,ssh-dss,ssh-rsa,ssh-ed25519
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debudebug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: setup hmac-md5-etm@openssh.com
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug2: mac_setup: setup hmac-md5-etm@openssh.com
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ED25519 c1:ad:de:47:7d:ad:a0:36:d3:5c:ed:4c:08:12:24:57
debug3: put_host_port: [192.168.15.105]:1025
debug3: put_host_port: [isg-1505]:1025
debug3: load_hostkeys: loading entries for host "[isg-1505]:1025" from file "/home/schwindt/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug3: load_hostkeys: loading entries for host "[192.168.15.105]:1025" from file "/home/schwindt/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug1: checking without port identifier
debug3: load_hostkeys: loading entries for host "isg-1505" from file "/home/schwindt/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug3: load_hostkeys: loading entries for host "192.168.15.105" from file "/home/schwindt/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
The authenticity of host '[isg-1505]:1025 ([192.168.15.105]:1025)' can't be established.
ED25519 key fingerprint is c1:ad:de:47:7d:ad:a0:36:d3:5c:ed:4c:08:12:24:57.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[isg-1505]:1025,[192.168.15.105]:1025' (ED25519) to the list of known hosts.
debug2: ssh_ed25519_verify: crypto_sign_ed25519_open failed: -1
debug1: ssh_ed25519_verify: signature incorrect
key_verify failed for server_host_key
g2: kex_parse_kexinit: none,zlib@openssh.com
(0010940)
yann (manager)
2014-10-18 14:59

Hi schwindt,

Good news, I was able to reproduce this problem with last openssh test suite.
I opened a bug upstream for the issue: https://bugzilla.mindrot.org/show_bug.cgi?id=2297 [^]

Yann


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