Stopped working with latest browsers #45
Comments
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Hi! Same here. SSHy stops working on all browsers except Mozilla Firefox... Anyone can fix this? Thanks! |
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As mentioned above you can edit out the function call and this will get you going. I am probably going to continue some development. I am 90% through some updates to remove all the globals from sshy, so it is possible to run multiple sshy terminals simultaneously... just for fun really but I really wanted to get into mastering some javascript objects. Currently works in wrapper, but index.html needs more work. Maybe push that one in a few weeks time. |
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@drgrussell I tried to remove this.bindKeys(); on js/combinedJS.comb.js (line 201) but the behaviour is the same... Did I miss something? Thanks!!!!!!!!! |
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Well it works for me. You might find the old library is still in your browser cache, which is particularly the case with chrome in my opinion. So changing the library and then pressing refresh or shift refresh doesnt load the new version. In the url for the javascript library I normally just put ?1 straight afterwards, as that would force a refresh so long as the number is different each time. Or clearing the browser data. Or via the developer window. |
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Hi @drgrussell ! thanks for your support. Dont have luck in my case... I just tried to remove the references to bindKeys(); and reload the library , even in a private browse window but the behaviour its the same, if I press intro key nothing happens. Did you have fix this? Wondering if you can paste the combinedJS.comb.js in pastebin or something similar... Also I have tried to disable google chrome extensions, maybe the problem was related to that, with no luck. :-(((( Thanks again! |
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Sorry, I found that removing the two references on this.bindKeys(); in combinedJS and combinedLibs works! Thank you @drgrussell |
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Yes Thanks @drgrussell 's fork, works fine in latest chrome. |
Refreshing with Ctrl + F5 usually does the trick. |
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@drgrussell I try using your fork to cling to my ssh via websockify - nothing comes out. My page turns white and displays this in the console:
And websockify reacts to the connection like this: WebSocket server settings:
- Listen on :222
- No SSL/TLS support (no cert file)
- proxying from :222 to 192.168.112.111:22
192.168.100.187 - - [09/Dec/2022 12:34:06] 192.168.100.187: Plain non-SSL (ws://) WebSocket connection
192.168.100.187 - - [09/Dec/2022 12:34:06] connecting to: 192.168.112.111:22
192.168.100.187 - - [09/Dec/2022 12:34:12] 192.168.100.187: Plain non-SSL (ws://) WebSocket connection
192.168.100.187 - - [09/Dec/2022 12:34:12] connecting to: 192.168.112.111:22I use the connection via <html>
<head>
<script type="text/javascript" src="js/combinedJS.comb.js" ></script>
<script type="text/javascript">
var wsproxyURL = "ws://192.168.100.187:222"
setProxyEncoding("binary");
</script>
<link rel="stylesheet" href="css/xterm.css" />
<link rel="stylesheet" href="css/main.css" />
</head>
<body>
<div id="terminal" style="height:100%;"></div>
</body>
</html>@drgrussell Have you abandoned your project yet? Are there any improvements? |
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I still use my fork of sshy every day, and it works fine with the current browsers.
One issue I did find was sshd in modern installs rejecting the host key algorithm ssh-rsa. Do check your sshd logs to see if this is the case.
Host key is not critical in sshy, so this is annoying. Only used to confirm the host signature.
The easiest solution is to
vi /etc/ssh/sshd_config
# Need ed25519 or ssh-rsa-2-512
# but sshy only supports ssh-rsa
HostKeyAlgorithms +ssh-rsa
Naturally this means your host key algorithm is less secure, but I don’t think this for me at least is a big deal.
I will work on my fork to fix this next year.
|
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@drgrussell Yes, it's working now! You were right, the problem was most likely with the encryption algorithm. I am now connecting via websockify without any problems and it works!!!
The only question I have left is is it possible to somehow transfer authorization data via a post request or using ajax? I want to pull authorization data from the database on my web portal when connecting via SSH. So that when connecting, I can automatically or via websockify put the token I need using the native websockify TokenFile plugin and transfer the login password for the selected token? |
@drgrussell The connection passes to openssh, but does not want to dropbear. Strangely, ssh-rsa is enabled on it by default. |
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@drgrussell Every time a connection is made to DropBear, the page is empty. Dropbear logs write that there is a connection, htop displays the child process of the connection, but there is nothing on the web page except errors in the console. Log dropbear: Dec 9 19:30:04 (none) authpriv.info dropbear[2246]: Child connection from 192.168.100.187:33914
Dec 9 19:30:07 (none) authpriv.info dropbear[2246]: Exit before auth from <192.168.100.187:33914>: Disconnect received
Dec 9 19:30:08 (none) authpriv.info dropbear[2247]: Child connection from 192.168.100.187:33924
Dec 9 19:30:09 (none) authpriv.info dropbear[2247]: Exit before auth from <192.168.100.187:33924>: Disconnect received
Dec 9 19:30:10 (none) authpriv.info dropbear[2248]: Child connection from 192.168.100.187:33928
|
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You would have to do the debugging and legwork on this issue. Capture the traffic detail with the ssh protocol decoded to see the difference between openssh and dropbear in the negotiation with sshy. sshy does not support all possible handshakes, and neither does dropbear it appears. I have never used it myself... No doubt there is some inconsistency in the handshake somewhere. |
@drgrussell I took a dump of packet exchange between a proxy and a remote host with dropbear. To be honest, without your help, I probably won't be able to figure it out.
I attach pcap files Wireshark. |
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@drgrussell For comparison, I took a dump of a successful connection with openssh
|
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I didnt even see the SSHv2 protocol appear in that first dump, so your issue must be really early. Indeed, I dont see the ssh server banner in the capture, which is the very first data packet in the handshake. The first packet appears to be 498 bytes, which is not likely to be an SSH banner. In the working example the banner is around 40 bytes, which sounds believable. You sure you are actually connecting to the right port and/or ip? You can telnet or netcat to the port at the shell prompt and the banner should appear. Naturally you should ssh normally to that port too just to check. Maybe you meant port 22 rather than 222? Regrettably I am not able to debug this for you. Didnt even know dropbear existed... |
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@drgrussell The port is specified correctly, since I started a new SSH process using port 222 and I joined it via the openssh-client. And dropbear is a very lightweight server. Here are the sources. Maybe they will clarify the handshake for understanding the omben. It is convenient to use it for embedded systems. I have just such a situation. I need to ssh to connect to my devices through the web portal. |
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@drgrussell Can you arrange your fork so that we can have a discussion there? Otherwise you don't have any contact details. I would be happy to take part in testing or some kind of assistance in the development of the project. Things are very necessary, since I have not found analogues for embedded systems. I will be very grateful to you for further work and assistance. P.S. And DropBear would still be very cool to embed support. |
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@drgrussell I have identified a small nuance. For some reason, the version of Dropbear v2018.76 on port 22 still raises the SSH protocol, but the version v2022.83 on port 222 does not raise the SSH protocol, but communicates only via the TCP protocol. I tried to connect via SSHy to the remote Dropbear server again. This time the dump showed that the communication went through SSHv2. Everything is fine. But the page also does not load, although Dropbear has launched a child process.
If I kill the Dropbear process, then the website gives out a page with the code 1000. So there is a connection, but something goes wrong anyway. I am providing a connection dump again.
|
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@drgrussell At some stage of the connection, it catches a hang, while the web page does not output anything. 2022-12-10.17-34-00.mp4 |
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@drgrussell You can try it, I have launched a distribution with dropbear in a virtual machine. OpenSSH-client connects to it without any problems. ssh [email protected]
user: root
password: poOZp*ZTK-69YI can't do anything. I've already reviewed a bunch of dumps, but I don't understand what is hanging on. |
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@drgrussell Debugging JS showed this about the OpenSSH{
"local_version": "SSH-2.0-SSHyClient",
"remote_version": "SSH-2.0-OpenSSH_9.0",
"local_kex_message": "\u0014�hÍ\u001dI�i�5}\u0016$-\u0014�©\u0000\u0000\u0000¹diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha256,diffie-hellman-group1-sha1\u0000\u0000\u0000\u0007ssh-rsa\u0000\u0000\u0000\naes128-ctr\u0000\u0000\u0000\naes128-ctr\u0000\u0000\u0000\u0017hmac-sha2-256,hmac-sha1\u0000\u0000\u0000\u0017hmac-sha2-256,hmac-sha1\u0000\u0000\u0000\u0004none\u0000\u0000\u0000\u0004none\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000",
"remote_kex_message": "\u0014\u0012PEåÆXißÊÏat 8Êu\u0000\u0000\u0001\[email protected],curve25519-sha256,[email protected],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\u0000\u0000\u0000Arsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519\u0000\u0000\[email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]\u0000\u0000\[email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]\u0000\u0000\u0000Õ[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1\u0000\u0000\u0000Õ[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1\u0000\u0000\u0000\u0015none,[email protected]\u0000\u0000\u0000\u0015none,[email protected]\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000",
"preferred_algorithms": [
"diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha256,diffie-hellman-group1-sha1",
"ssh-rsa",
"aes128-ctr",
"hmac-sha2-256,hmac-sha1",
"none",
""
],
"preferred_kex": {
"transport": null,
"SHAVersion": "SHA-256",
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}If I understand correctly, then Dropbear did not pass the public key because there is no entry in the parameter |
|
And here are the successful connections to Dropbear using webssh |
|
I'm the Dropbear author. I hadn't seen SSHy, looks handy. I think the problem is that the Lines 81 to 82 in 82941c8 In #45 (comment) the |
|
Hi mkj... |
|
It turns out that the server data comes in one package at once. I tried to sort it out by bytes here. Maybe you'll need it when you watch the package.
|
|
@drgrussell I think you should take a look at these improvements. There is some progress in the solution, but the problem with the algorithm, I'm probably not sure. |
Great It works for me! |
Not really sure what is wrong, but I cannot now use SSHy with the latest Chrome or Edge browser.
Exactly the same problem I was having with safari a few months back.
The ENTER key is no longer bubbling up to term.textarea.onkeydown in js/SSHyClient.js.
Note if I comment out (delete) "this.bindKeys" from combinedJS.comb.js everything works fine again. This seems to capture a number of events at the lowest DIV levels and does not always bubble up to your event handler. Unfortunately that is part of xterm.min.js. I did try to update the code to the latest xtermjs, but there seems to be an issue with the function "fix", which I couldnt find any documentation on. I did see an xtermjs extension called fix, but that could be a co-incidence.
Incidentally removing this.bindKeys got me working again in Safari, so win-win.
Happy to help if I can.
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