09-21-2009
Another option would be to enable public key authentication, give those users their key-pair, and a week later set their passwords to some random string, re-set every hour or so.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Just took over a UNIX Server from someone who left our company.
Having problems with access by some existing users as well as new users.
I get the following message from telnet sessions, when attempting access at the "Login:" prompt:
"UX:in.login:ERRO: Login incorrect"
"telnetd:Unable to... (2 Replies)
Discussion started by: Vincent Garcia
2 Replies
2. Cybersecurity
Hi,
We have a user who needs to connect to us over the internet using an ssh client. We use HP-UX 11.00.
We set up a home directory with login and password for them. We would not want to give them full roaming access for the server ie, they should not be able to cd up the directory tree.
... (2 Replies)
Discussion started by: Bab00shka
2 Replies
3. Shell Programming and Scripting
Hi,
I am writing a script on Solaris 10 and want to execute a remote ssh command. Normally this command should just return the value 0000000000002356 but when using ssh it seems it is passing the result to the shell to execute.
ssh root@10.5.112.145 `/usr/bin/nawk -F\, '$1=="USG" && $2=="01"... (3 Replies)
Discussion started by: borderblaster
3 Replies
4. UNIX for Advanced & Expert Users
I have one shell script which is being accessed by many jobs at same time.
I want to make the script such that , other job should wait for the script if script is being used by some other job. Is there any way to implement it in script level ?
Gops (1 Reply)
Discussion started by: Gopal_Engg
1 Replies
5. Shell Programming and Scripting
Hi Team,
we have problem with sftp. Though SA team has setup the keys between 2 server, sftp still prompts for the password. After many attempt to rectify the problem, SA has asked us force the SSH key based authentication by using following command.
sftp2 --indetity="folder/private_key"... (6 Replies)
Discussion started by: ace_friends22
6 Replies
6. AIX
Hello everyone,
Can anyone help me please. I want to disable SSH direct access for an AIX user.
For example, if I have USER1 and USER2. I want to disactivate direct access for USER2. The user must enter his login (USER1) and his password and then he can do su - USER2 .
Thanks, (3 Replies)
Discussion started by: adilyos
3 Replies
7. Red Hat
does anyone know how to force ssh/ssl to use the hosts file instead of DNS? I have disabled the DNS servers but ssh still will not resolve a host in the hosts file.
thanks in advance for the help!
DS (3 Replies)
Discussion started by: derrell simpson
3 Replies
8. Shell Programming and Scripting
I want to test the effectiveness of sshguard on some of my systems so I'm trying to write a script that simulates a brute force attack by sending a bunch of different username and password combinations to the servers being tested. So far I have this:
#!/usr/local/bin/expect
set timeout 3... (5 Replies)
Discussion started by: ph0enix
5 Replies
9. IP Networking
I would like to disable X11 session forcefully. I have tried the following things:
1. Setting appropriate DISPLAY variable in the /etc/environment file to be "0.0"
2. I have tried setting the sshd_config parameter X11Forwarding to be "no"
This session communication is happening by exchanging... (2 Replies)
Discussion started by: vaibhavvsk
2 Replies
10. UNIX for Advanced & Expert Users
Hi Experts,
Need your support
Redhat 6.5
I want to create a user with all(read, write, execute) privileges except that user should not be able to create any new user from his login
to perform any task. (10 Replies)
Discussion started by: as7951
10 Replies
LEARN ABOUT CENTOS
evp_sealfinal
EVP_SealInit(3) OpenSSL EVP_SealInit(3)
NAME
EVP_SealInit, EVP_SealUpdate, EVP_SealFinal - EVP envelope encryption
SYNOPSIS
#include <openssl/evp.h>
int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
unsigned char **ek, int *ekl, unsigned char *iv,
EVP_PKEY **pubk, int npubk);
int EVP_SealUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
int *outl, unsigned char *in, int inl);
int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
int *outl);
DESCRIPTION
The EVP envelope routines are a high level interface to envelope encryption. They generate a random key and IV (if required) then
"envelope" it by using public key encryption. Data can then be encrypted using this key.
EVP_SealInit() initializes a cipher context ctx for encryption with cipher type using a random secret key and IV. type is normally supplied
by a function such as EVP_des_cbc(). The secret key is encrypted using one or more public keys, this allows the same encrypted data to be
decrypted using any of the corresponding private keys. ek is an array of buffers where the public key encrypted secret key will be written,
each buffer must contain enough room for the corresponding encrypted key: that is ek[i] must have room for EVP_PKEY_size(pubk[i]) bytes.
The actual size of each encrypted secret key is written to the array ekl. pubk is an array of npubk public keys.
The iv parameter is a buffer where the generated IV is written to. It must contain enough room for the corresponding cipher's IV, as
determined by (for example) EVP_CIPHER_iv_length(type).
If the cipher does not require an IV then the iv parameter is ignored and can be NULL.
EVP_SealUpdate() and EVP_SealFinal() have exactly the same properties as the EVP_EncryptUpdate() and EVP_EncryptFinal() routines, as
documented on the EVP_EncryptInit(3) manual page.
RETURN VALUES
EVP_SealInit() returns 0 on error or npubk if successful.
EVP_SealUpdate() and EVP_SealFinal() return 1 for success and 0 for failure.
NOTES
Because a random secret key is generated the random number generator must be seeded before calling EVP_SealInit().
The public key must be RSA because it is the only OpenSSL public key algorithm that supports key transport.
Envelope encryption is the usual method of using public key encryption on large amounts of data, this is because public key encryption is
slow but symmetric encryption is fast. So symmetric encryption is used for bulk encryption and the small random symmetric key used is
transferred using public key encryption.
It is possible to call EVP_SealInit() twice in the same way as EVP_EncryptInit(). The first call should have npubk set to 0 and (after
setting any cipher parameters) it should be called again with type set to NULL.
SEE ALSO
evp(3), rand(3), EVP_EncryptInit(3), EVP_OpenInit(3)
HISTORY
EVP_SealFinal() did not return a value before OpenSSL 0.9.7.
1.0.1e 2013-02-11 EVP_SealInit(3)