Re: [Question] : git 2.33.1 asks every time password

Check which OpenSSL client you're using.

Recently, Git for Windows included an option to use the Windows OpenSSL client.
I tried it and found it to only be a source of pain and bad documentation.

Personally, I've had better experience with the OpenSSL bundled with mingw

On Fri, Dec 31, 2021 at 11:37 AM Jean-Louis FLOQUET [off-list ref] wrote:

Hi Brian,

Thanks for your answer.
I'm the maintainer of the server (I'm definitely NOT an expert with
crypto/keys/etc); I use GitBlit 1.9.1. (latest available version).
I have generated the keys (private & public) some years ago, but I
don't know how to create new keys with more recent algorithm.
Please find the output from "ssh -vvv <ip> - p <port>". Please also
note that the "known_hosts2" file doesn't exist (the one without the
"2" exists)

Best regards,
JL

======================================================================================
$ ssh -vvv <ip> -p <port>
OpenSSH_8.8p1, OpenSSL 1.1.1l  24 Aug 2021
debug1: Reading configuration data
/c/Users/user/AppData/Roaming/SPB_Data/.ssh/config
debug1: /c/Users/user/AppData/Roaming/SPB_Data/.ssh/config line 3:
Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolve_canonicalize: hostname <ip> is address
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' ->
'/c/Users/user/AppData/Roaming/SPB_Data/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' ->
'/c/Users/user/AppData/Roaming/SPB_Data/.ssh/known_hosts2'
debug3: ssh_connect_direct: entering
debug1: Connecting to <ip> [<ip>] port <port>.
debug3: set_sock_tos: set socket 4 IP_TOS 0x48
debug1: Connection established.
debug1: identity file /path_to_rsa_key type 0
debug1: identity file /path_to_rsa_key-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.8
debug1: Remote protocol version 2.0, remote software version
Gitblit_v1.9.1 (SSHD-CORE-1.2.0-NIO2)
debug1: compat_banner: no match: Gitblit_v1.9.1 (SSHD-CORE-1.2.0-NIO2)
debug2: fd 4 setting O_NONBLOCK
debug1: Authenticating to <ip>:<port> as 'user'
debug3: put_host_port: [<ip>]:<port>
debug3: record_hostkey: found key type DSA in file
/c/Users/user/AppData/Roaming/SPB_Data/.ssh/known_hosts:1
debug3: load_hostkeys_file: loaded 1 keys from [<ip>]:<port>
debug1: load_hostkeys: fopen
/c/Users/user/AppData/Roaming/SPB_Data/.ssh/known_hosts2: No such file
or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file
or directory
debug3: order_hostkeyalgs: prefer hostkeyalgs: ssh-dss
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,curve25519-sha256@libssh.org,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
debug2: host key algorithms:
ssh-dss,ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256
debug2: ciphers ctos:
chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,aes256-cbc,aes192-cbc
debug2: ciphers stoc:
chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,aes256-cbc,aes192-cbc
debug2: MACs ctos:
umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc:
umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms:
ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,ssh-dss
debug2: ciphers ctos:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos:
hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha2-512,hmac-sha1-96,hmac-md5-96
debug2: MACs stoc:
hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha2-512,hmac-sha1-96,hmac-md5-96
debug2: compression ctos: none,zlib,zlib@openssh.com
debug2: compression stoc: none,zlib,zlib@openssh.com
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: ecdh-sha2-nistp256
debug1: kex: host key algorithm: ssh-dss
debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256
compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256
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-dss
SHA256:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
debug3: put_host_port: [<ip>]:<port>
debug3: put_host_port: [<ip>]:<port>
debug3: record_hostkey: found key type DSA in file
/c/Users/user/AppData/Roaming/SPB_Data/.ssh/known_hosts:1
debug3: load_hostkeys_file: loaded 1 keys from [<ip>]:<port>
debug1: load_hostkeys: fopen
/c/Users/user/AppData/Roaming/SPB_Data/.ssh/known_hosts2: No such file
or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file
or directory
debug1: Host '[<ip>]:<port>' is known and matches the DSA host key.
debug1: Found key in /c/Users/user/AppData/Roaming/SPB_Data/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 4294967296 blocks
debug1: Will attempt key: /path_to_rsa_key RSA
SHA256:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx explicit
debug2: pubkey_prepare: done
debug3: send packet: type 5
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 51
debug1: Authentications that can continue:
password,keyboard-interactive,publickey
debug3: start over, passed a different list
password,keyboard-interactive,publickey
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
debug1: Offering public key: /path_to_rsa_key RSA
SHA256:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx explicit
debug1: send_pubkey_test: no mutual signature algorithm
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 60
debug2: input_userauth_info_req: entering
Password authentication
debug2: input_userauth_info_req: num_prompts 1
(user@<ip>) Password:
debug3: send packet: type 61
Connection reset by <ip> port <port>

Le jeu. 30 déc. 2021 à 21:35, brian m. carlson
[off-list ref] a écrit :

quoted

On 2021-12-30 at 15:56:12, Jean-Louis FLOQUET wrote:

quoted

Hi,

I use some scripts to do some batch operations (pull / push), using
rsa key and ssh-agent / ssh-add. I'm under Windows 10 (with all
updates).
When launching my script (see below, truncated : more than 100 repo),
I have to enter rsa passphrase (OK) then all push/pull are done
without any user interaction (no passphrase, no password, nothing)
All Git versions up to 2.33.0.2 are working fine, but since 2.33.1,
git asks every time the password.
I had to create a 'config' file within '.ssh' directory to support my
rsa key (too old format ?). Instructions according to
https://stackoverflow.com/questions/35233777/git-error-unable-to-negotiate-with-xx-xx-xxx-xxx-no-matching-host-key-type-fo

If you're seeing this problem, then the system to which you're
connecting is insecurely configured and using obsolete cryptography.
You should inform the maintainers of that system of that fact and ask
them to fix it.

quoted

I also have seen that some people have to add 'ssh-add -K', but it
seems to be only for MacOS.
According to release notes for 2.33.1, Git Credential Manager for
Windows has been replaced by Git Credential Manager Core, but I don't
know if it is the "root" problem, and if yes, how to fix my issue.
I would greatly appreciate any help / solution. Thanks in advance.

You should run "ssh -vvv SERVER", where SERVER is the server to which
you're connecting (e.g., git@github.com or whatever) and see what the
output prints.  That should tell you why it's falling back to a
password-based configuration.

Note that credential managers are only used for HTTP and HTTPS
credentials and not for SSH, which is separate.
--
brian m. carlson (he/him or they/them)
Toronto, Ontario, CA