Add read_ssh_blocking (backport #964) #989
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The function receives now a new parameter timeout.
If a timeout is given, enables the blocking ssh read until it gives the timeout or there is no bytes left to read.
Otherwise, it does a non-blocking ssh read as before.
To test, run the following script (it should be a debian based OS, with dpkg cmd)
`time sudo openvas-nasl -X -B -d -i /home/jjnicola/install/var/lib/openvas/plugins -t 192.168.0.1 ssh_shell_gather_package_list_ssh_read_timeout.nasl
`
```
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.ssh1");
script_version("2020-11-12T09:50:32+0000");
script_tag(name:"last_modification", value:"2021-11-17 11:25:00 +0000 (Mon, 17 May 2021)");
script_tag(name:"creation_date", value:"2021-11-17 11:25:00 +0000 (Mon, 17 May 2021)");
script_tag(name:"cvss_base", value:"0.0");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");
script_name("SSH shell 1");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2007-2012 Greenbone Networks GmbH");
script_family("General");
script_tag(name:"summary", value:"This script tries to login with provided credentials.
If the login was successful, it marks this port as available for any authenticated tests.");
script_tag(name:"qod_type", value:"remote_banner");
exit(0);
}
include("ssh_func.inc");
include("misc_func.inc");
port = 22;
user = 'USER';
pass = 'PASS';
priv_user = 'root';
priv_pass = 'ROOT_PASS';
function clean_buffer(sess) {
while( TRUE ) {
c = ssh_shell_read(sess);
if( strlen( c ) <= 0 ) break;
}
};
soc = open_sock_tcp( port );
if( ! soc ) exit( 0 );
display (soc);
display("Open connection");
sess = ssh_connect( socket:soc );
display("User Auth");
prompt = ssh_userauth(sess, login:user, password:pass);
display("Open shell");
sess = ssh_shell_open (sess, pty:1);
clean_buffer (sess);
cmd1 = "whoami" + '\n';
sh_wr = ssh_shell_write(sess, cmd:cmd1);
ret = "";
ret = ssh_shell_read(sess, timeout: 1000);
display("Return whoami before priv login: ", ret);
display("Changing to root");
cmd1 = 'su - ' + priv_user + '\n';
sh_wr = ssh_shell_write(sess, cmd:cmd1);
ret = "";
ret = ssh_shell_read(sess, timeout: 1000);
display(ret);
if (strstr(ret, "Password")){
cmd1 = priv_pass + '\n';
sh_wr = ssh_shell_write(sess, cmd:cmd1);
clean_buffer(sess);
}
cmd1 = 'dpkg -l' + '\n';
sh_wr = ssh_shell_write(sess, cmd:cmd1);
ret = ssh_shell_read(sess, timeout: 1000);
display("Return whoami after priv login: ", ret);
ssh_shell_close(sess);
ssh_disconnect(sess);
display("Finished, close, disconnect script 1");
```
(cherry picked from commit be5a0af)
jjnicola
approved these changes
Dec 6, 2021
ArnoStiefvater
approved these changes
Dec 7, 2021
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This is an automatic backport of pull request #964 done by Mergify.
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