SSH key code versus server key code Post: 302071119

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Special Forums Cybersecurity SSH key code versus server key code Post 302071119 by x96riley3 on Wednesday 12th of April 2006 11:57:26 AM

04-12-2006

Registered User

I think most people are not following what you need.

When you log into the remote server you are accepting the servers host key. This is done the first time you go there. The next time you go there, ssh will check to make sure the host key you accepted the first time is still the same host key. If it's not you will get a man-in-the-middle error. This says, "Hey, your host key doesn't match what I have for a host key. Either I somehow have a new host key or someone is trying to become the target server." If you trust the server, you accept the new host key which is stored locally for you. Once this has taken place you should be prompted to enter your passphrase.

Host keys are used to identify servers. Why? Cause someone could be performing a DOS attack against the real server. There could be IP spoofing of some sort going on. This helps prevent that.

Hope this helps.

-X

x96riley3

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curlopt_ssh_host_public_key_md5

CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)			     curl_easy_setopt options				CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)

NAME

       CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 - checksum of SSH server public key

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_HOST_PUBLIC_KEY_MD5,
				 char *md5);

DESCRIPTION

       Pass  a	char  *  pointing to a string containing 32 hexadecimal digits. The string should be the 128 bit MD5 checksum of the remote host's
       public key, and libcurl will reject the connection to the host unless the md5sums match.

       The application does not have to keep the string around after setting this option.

DEFAULT

       NULL

PROTOCOLS

       SCP and SFTP

EXAMPLE

       TODO

AVAILABILITY

       Added in 7.17.1

RETURN VALUE

       Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO

       CURLOPT_SSH_PUBLIC_KEYFILE(3), CURLOPT_SSH_AUTH_TYPES(3),

libcurl 7.54.0							 December 21, 2016				CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)