Client-side public key causing mess

Fri Apr 22 23:06:14 AEST 2016

On Apr 19, 2016 8:11 AM, "Elouan Keryell-Even" <elouan.keryell at gmail.com>
wrote:
>
> Hello,
>
>
>
> I have a client machine and a server machine. I generated a pair of
> private-public rsa keys using ssh-keygen.
>
>
>
> On the client-machine, I uploaded my private key onto ~/.ssh/id_rsa
>
> On the server machine, I appended the content of the public key to
> .ssh/authorized_keys
>
>
>
> I can successfully connect from the client to the server with that config.
>
>
>
> However, on the client-side, if I add a ~/.ssh/id_rsa.pub public key file
> that doesn’t match  the private key file ~/.ssh/id_rsa, it will fail with
> “Permission denied (publickey).”
>
>
>
> Error on the server-side (sshd logs):
>
> error: RSA_public_decrypt failed:
> error:0407006A:lib(4):func(112):reason(106)
>
>
>
>
>
> # openssl errstr 0407006A
>
> error:0407006A:rsa routines:RSA_padding_check_PKCS1_type_1:block type is
> not 01
>
>
>
> It seems weird to me that a public key on the client side is taken into
> account, when it works well without.
>
>
>
> Linux distrib: CentOS 7
>
> ssh version on the client side: OpenSSH_6.6.1p1, OpenSSL 1.0.1e-fips 11
Feb
> 2013
>
> ssh version on the server side: OpenSSH_6.6.1p1, OpenSSL 1.0.1e-fips 11
Feb
> 2013
>
>
>
> Full verbose output of ssh-client:
>
> # ssh -vvv <server-ip>
>
      What happens if you specify the private key (as in -i
/root/.ssh/id_rsa)?

> OpenSSH_6.6.1, OpenSSL 1.0.1e-fips 11 Feb 2013
>
> debug1: Reading configuration data /etc/ssh/ssh_config
>
> debug1: /etc/ssh/ssh_config line 56: Applying options for *
>
> debug2: ssh_connect: needpriv 0
>
> debug1: Connecting to <server-ip> [<server-ip>] port 22.
>
> debug1: Connection established.
>
> debug1: permanently_set_uid: 0/0
>
> debug3: Incorrect RSA1 identifier
>
> debug3: Could not load "/root/.ssh/id_rsa" as a RSA1 public key
>
> debug1: identity file /root/.ssh/id_rsa type 1
>
> debug1: identity file /root/.ssh/id_rsa-cert type -1
>
> debug1: identity file /root/.ssh/id_dsa type -1
>
> debug1: identity file /root/.ssh/id_dsa-cert type -1
>
> debug1: identity file /root/.ssh/id_ecdsa type -1
>
> debug1: identity file /root/.ssh/id_ecdsa-cert type -1
>
> debug1: identity file /root/.ssh/id_ed25519 type -1
>
> debug1: identity file /root/.ssh/id_ed25519-cert type -1
>
> debug1: Enabling compatibility mode for protocol 2.0
>
> debug1: Local version string SSH-2.0-OpenSSH_6.6.1
>
> debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1
>
> debug1: match: OpenSSH_6.6.1 pat OpenSSH_6.6.1* compat 0x04000000
>
> debug2: fd 3 setting O_NONBLOCK
>
> debug3: load_hostkeys: loading entries for host "<server-ip>" from file
> "/root/.ssh/known_hosts"
>
> debug3: load_hostkeys: found key type ECDSA in file
/root/.ssh/known_hosts:1
>
> debug3: load_hostkeys: loaded 1 keys
>
> debug3: order_hostkeyalgs: prefer hostkeyalgs:
> ecdsa-sha2-nistp256-cert-v01 at openssh.com,
ecdsa-sha2-nistp384-cert-v01 at openssh.com,
ecdsa-sha2-nistp521-cert-v01 at openssh.com
,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
>
> debug1: SSH2_MSG_KEXINIT sent
>
> debug1: SSH2_MSG_KEXINIT received
>
> debug2: kex_parse_kexinit:
> curve25519-sha256 at 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 at openssh.com,
ecdsa-sha2-nistp384-cert-v01 at openssh.com,
ecdsa-sha2-nistp521-cert-v01 at openssh.com
,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,
ssh-ed25519-cert-v01 at openssh.com,ssh-rsa-cert-v01 at openssh.com,
ssh-dss-cert-v01 at openssh.com,ssh-rsa-cert-v00 at openssh.com,
ssh-dss-cert-v00 at openssh.com,ssh-ed25519,ssh-rsa,ssh-dss
>
> debug2: kex_parse_kexinit:
> aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,
> aes128-gcm at openssh.com,aes256-gcm at openssh.com,
chacha20-poly1305 at openssh.com
>
,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,
> rijndael-cbc at lysator.liu.se
>
> debug2: kex_parse_kexinit:
> aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,
> aes128-gcm at openssh.com,aes256-gcm at openssh.com,
chacha20-poly1305 at openssh.com
>
,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,
> rijndael-cbc at lysator.liu.se
>
> debug2: kex_parse_kexinit:
> hmac-md5-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64-etm at openssh.com
,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,
hmac-sha2-512-etm at openssh.com,hmac-ripemd160-etm at openssh.com,
hmac-sha1-96-etm at openssh.com,hmac-md5-96-etm at openssh.com,hmac-md5,hmac-sha1,
umac-64 at openssh.com,umac-128 at openssh.com
,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 at openssh.com
,hmac-sha1-96,hmac-md5-96
>
> debug2: kex_parse_kexinit:
> hmac-md5-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64-etm at openssh.com
,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,
hmac-sha2-512-etm at openssh.com,hmac-ripemd160-etm at openssh.com,
hmac-sha1-96-etm at openssh.com,hmac-md5-96-etm at openssh.com,hmac-md5,hmac-sha1,
umac-64 at openssh.com,umac-128 at openssh.com
,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 at openssh.com
,hmac-sha1-96,hmac-md5-96
>
> debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib
>
> debug2: kex_parse_kexinit: none,zlib at 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 at 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,ecdsa-sha2-nistp256
>
> debug2: kex_parse_kexinit:
> aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,
> aes128-gcm at openssh.com,aes256-gcm at openssh.com,
chacha20-poly1305 at openssh.com
>
,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,
> rijndael-cbc at lysator.liu.se
>
> debug2: kex_parse_kexinit:
> aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,
> aes128-gcm at openssh.com,aes256-gcm at openssh.com,
chacha20-poly1305 at openssh.com
>
,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,
> rijndael-cbc at lysator.liu.se
>
> debug2: kex_parse_kexinit:
> hmac-md5-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64-etm at openssh.com
,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,
hmac-sha2-512-etm at openssh.com,hmac-ripemd160-etm at openssh.com,
hmac-sha1-96-etm at openssh.com,hmac-md5-96-etm at openssh.com,hmac-md5,hmac-sha1,
umac-64 at openssh.com,umac-128 at openssh.com
,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 at openssh.com
,hmac-sha1-96,hmac-md5-96
>
> debug2: kex_parse_kexinit:
> hmac-md5-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64-etm at openssh.com
,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,
hmac-sha2-512-etm at openssh.com,hmac-ripemd160-etm at openssh.com,
hmac-sha1-96-etm at openssh.com,hmac-md5-96-etm at openssh.com,hmac-md5,hmac-sha1,
umac-64 at openssh.com,umac-128 at openssh.com
,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 at openssh.com
,hmac-sha1-96,hmac-md5-96
>
> debug2: kex_parse_kexinit: none,zlib at openssh.com
>
> debug2: kex_parse_kexinit: none,zlib at openssh.com
>
> debug2: 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 at openssh.com
>
> debug1: kex: server->client aes128-ctr hmac-md5-etm at openssh.com none
>
> debug2: mac_setup: setup hmac-md5-etm at openssh.com
>
> debug1: kex: client->server aes128-ctr hmac-md5-etm at openssh.com none
>
> debug1: kex: curve25519-sha256 at libssh.org need=16 dh_need=16
>
> debug1: kex: curve25519-sha256 at libssh.org need=16 dh_need=16
>
> debug1: sending SSH2_MSG_KEX_ECDH_INIT
>
> debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
>
> debug1: Server host key: ECDSA <fingerprint>
>
> debug3: load_hostkeys: loading entries for host "<server-ip>" from file
> "/root/.ssh/known_hosts"
>
> debug3: load_hostkeys: found key type ECDSA in file
/root/.ssh/known_hosts:1
>
> debug3: load_hostkeys: loaded 1 keys
>
> debug1: Host '<server-ip>' is known and matches the ECDSA host key.
>
> debug1: Found key in /root/.ssh/known_hosts:1
>
> debug1: ssh_ecdsa_verify: signature correct
>
> 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: SSH2_MSG_SERVICE_REQUEST sent
>
> debug2: service_accept: ssh-userauth
>
> debug1: SSH2_MSG_SERVICE_ACCEPT received
>
> debug2: key: /root/.ssh/id_rsa (0x7fb0334d5fd0),
>
> debug2: key: /root/.ssh/id_dsa ((nil)),
>
> debug2: key: /root/.ssh/id_ecdsa ((nil)),
>
> debug2: key: /root/.ssh/id_ed25519 ((nil)),
>
> debug1: Authentications that can continue: publickey
>
> debug3: start over, passed a different list publickey
>
> debug3: preferred
> gssapi-keyex,gssapi-with-mic,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 RSA public key: /root/.ssh/id_rsa
>
> debug3: send_pubkey_test
>
> debug2: we sent a publickey packet, wait for reply
>
> debug1: Authentications that can continue: publickey
>
> debug1: Trying private key: /root/.ssh/id_dsa
>
> debug3: no such identity: /root/.ssh/id_dsa: No such file or directory
>
> debug1: Trying private key: /root/.ssh/id_ecdsa
>
> debug3: no such identity: /root/.ssh/id_ecdsa: No such file or directory
>
> debug1: Trying private key: /root/.ssh/id_ed25519
>
> debug3: no such identity: /root/.ssh/id_ed25519: No such file or directory
>
> debug2: we did not send a packet, disable method
>
> debug1: No more authentication methods to try.
>
> Permission denied (publickey).
>
>
>
> Elouan
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