OpenSSL is an open-source implementation of the SSL and TLS protocols. The core library, written in the C programming language, implements the basic cryptographic functions and provides various utility functions.

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Apache / OpenSSL configuration keywords `SSLProtocol` vs. `SSLCipherSuite`

According to the Apache docs I can configure the cipher suite with (a.o.) two different keywords and examples on Internet often use both (but not necessarily identical to below example). What is the ...
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366 views

Multiple DH/ECDH parameters in Apache 2.4.7 configuration file

I'm running Apache 2.4.7 on an Ubuntu 14.04 ("Trusty") server. The Ubuntu-specific package identifier is "2.4.7-1ubuntu4.1". If one does not explicitly specify DH/ECDH parameters (see below), Apache ...
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929 views

Updating OpenSSL on a SLES11 server

We are concerned with the OpenSSL vulnerabilities and are running a SLES11SP1 server. unfortunately, due to admin reasons, our support expired, and so we are looking at manually upgdating OpenSSL and ...
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Backup server with tar, encrypt and directly transfer the result, AFTER BUFFERING IT

So I've been investigative how to make full backups with tar, and I found that tar is a good tool if the backup is to be made once, and if the server has enough disk space to handle the output file. ...
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Upgrading openssl from 0.9.8j-0.50.1 to 1.0.2a on SLES11SP3

I need to upgrade OPENSSL from 0.9.8j-0.50.1 -> 1.0.2a on a server that is running sles11 sp3 for dynamically linking into my program. Steps followed for upgrade my build environment(sles11sp3): ...
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How do I decrypt a message using openssl's CLI?

I have a message, I know the password and the cipher that was used to encrypt it, but I can't figure out how to ask openssl to decrypt it. I see the cipher in the output from the ciphers command, and ...
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3k views

RHEL 6.4: Openssl 1.0.0-27 libcrypto and libssl missing

I am trying to install znc IRC bouncer, which needs openssl libraries: Error: Package: znc-1.4-1.el6.x86_64 (epel) Requires: libcrypto.so.10(libcrypto.so.10)(64bit) Error: Package: ...
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42 views

OpenSSL 1.0.2.a and Centos5.7

I have an old version of Centos (5.7) and I would like to enable TLS 1.2 due to Google Chrome warning about TLS 1.0 I tried to update with yum but I can see that no OpenSSL 1.x could be installed ...
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How do I recover from the Heartbleed bug in OpenSSL?

CVE-2014-0160 a.k.a. Heartbleed is a vulnerability in OpenSSL. It looks scary. How do I determine whether I am affected? If I'm affected, what do I need to do? Apparently upgrading isn't enough.
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SSL by IP or domain

The server that this is for will operate in a intranet environment... I have Apache working with SSL. I am using a self-signed SSL Certificate created using the steps outlined here: ...
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How do I generate SSHFP records?

I need to setup SSHFP records in the DNS for my host. I have done some searching but I haven't found any good example. What are SSHFP records? What does SSHFP records look like? How do I create ...
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973 views

How to display server's TLS certicicate details in terminal?

Having TLS certificate in local file, I can display its details using syntax like: openssl x509 -text -noout -in cert_filename Is there any way to display remote SMTP/POP3/HTTP server's TLS ...
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27k views

How to encrypt messages/text with RSA? (using openssl?)

I have Alice's public key. I want to send Alice an RSA encrypted message. How can I do it using the openssl command? The message is: Hi Alice! Please bring malacpörkölt for dinner!
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1k views

Updating openssl on debian squeeze

Can I replace my openssl 0.9.8o-4squeeze16 package with http://ftp.de.debian.org/debian/pool/main/o/openssl/openssl_1.0.1h-3_amd64.deb without any problems/concers? I did a apt-get update but I did ...
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158 views

Does Apache 2.2.3 support TLSv1.1 and TLSv1.2?

How can I find out if Apache 2.2.3 supports TLSv1.1 and TLSv1.2? If possible how can I implement it?
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Protected multilib versions: openssl

I'm running on Centos 6.2 x86_64 Trying to install ruby 2.1.2 ---> Package libselinux-devel.x86_64 0:2.0.94-5.2.el6 will be installed --> Processing Dependency: libsepol-devel >= 2.0.32-1 ...
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Skype/Spotify Installation Error: Cannot Install libssl1.0.0:i386

OpenSSL has been giving me a lot of gripe lately with some pieces of software such as spotify and skype. I include both apps because I think it's the same issue causing both to stop installing, ...
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How to block ciphers supported by OpenSSL in OpenSSL's configuration?

I'm not sure if this is going to be appropriate question but is there a way to block ciphers suites supported by OpenSSL in OpenSSL configuration as oppose to doing it in Apache by creating: ...
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845 views

Certificate extensions in generating and signing certificartes using openssl

References: SSL Configurations for Intermediate certificate How to add my own created certificate authority to system trusted repositories Why I can't find a page which tell me what's the kind of ...
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Implementing TLS 1.2 when I SSH into a box as a measure against POODLE

Is it possible to edit sshd_config or ssh_config, such that the SSH connection into a machine configured to use TLS1.2 is successful and rejects connections configured to use TLS1.1 and below, as well ...
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How does s_client turn ip6-localhost into 127.0.0.1?

When I use openssl s_client and ask it to connect to ip6-localhost it actually connects to 127.0.0.1 instead of ::1. This is what I see on both Ubuntu and Debian: $ strace -e connect openssl ...
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ssl_engine_init.lo Error 1, compiling Apache with OpenSSL

I have installed (with no problems) OpenSSL 0.9.8zd by compiling: ./config no-ssl2 no-ssl3 no-idea no-rc5 no-md2 Next, I wanted to install Apache 2.2.3 by compiling: ./configure ...
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Enable TLS-SRP for, say, courier-imap

I want to use TLS-SRP for the services that I run on my server, because I don't want to leak credentials, not even on the server's disk. There are several articles on setting up TLS-SRP either with ...
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open ssl client giving error routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:188:

On connecting to my application (a ssl server) by using command openssl s_client -host 127.0.0.1 -port 5028 -cipher EXPORT -debug -state I am getting error like CONNECTED(00000003) ...
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979 views

postfix smtp connection timed out, why?

A CentOS 7 web server has postfix, dovecot, and mailx installed. I have been able to make an IMAP connection to the server in order to read inbox mail using a remote Thunderbird client, but I am not ...
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65 views

Sign a soap message from a JKS dynamically using Python Unix

I am currently calling a webservice using Curl command from unix . I have a requirement that I have to dynamically message sign the soap request every time I make a call to the webservice using my ...
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530 views

Problem installing John the Ripper Jumbo on Kali - libssl-dev dependecy

I am trying to install John the Ripper Jumbo on my Kali box. For some reason the version of Kali I recently installed as the host OS on a spare laptop does not seem to have NTLM hash support (whereas ...
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346 views

Building cURL 7.40.0 and OpenSSL 1.0.2 from source: Headers and library doesn't match

I would like to ask for assistance, related to cURL and OpenSSL, both of them, built from sources. OS is Debian 7, latest version, minimal and clean install. Only installed packages: apt-get -y ...
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217 views

Solaris 10 openssl version 1.0.1k but apache httpd not compiling,showing version too old-0.9.8a

I have compiled openssl from source on my solaris machine to a newer location apart from the default one. When I set the newly compiled ssl path in PATH variable and LD_Library path and then compile ...
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63 views

Compiling LibSSH2 with specific LibSSL

I have downloaded and compiled the latest version of libssl, the result of which is located at /usr/local/ssl. I want to compile libssh2 using the files in this folder, and to do that I've set the ...
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108 views

SSH via cert-authority

I'm trying to use SSH using signed certificates. I'm using ssh -i keys/client.key to connect to the target device. If I generate a public key from that private key (with ssh-keygen -y -f ...
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106 views

Equivalent of Java's String.getBytes() in Unix Shell (Cygwin)

Let's say I convert my string into byte array. byte[] byte sUserID.getBytes(“UTF-8”); //Convert User ID String to byte array Now I need to write a script on Shell that will have exactly the ...
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81 views

Custom OpenSSL engine when running within Apache via mod_ssl

I modified my openssl.cnf to specify a custom engine for some operations. It works fine if I go through the openssl binary directly, but if I load libssl from another program it doesn't seem to use ...
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270 views

How to get binary representations of strings in Shell?

I'm using openssl dgst -sha1 -binary to get hash values of my strings in binary format. (I'm using -binary flag because my version of openssl adds "stdout" before each hash value on default output, ...
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NTP compilation failed - without ssl

I am trying to cross compile NTP ver 4.2.8 without SSL support. I gave --without-crypto while configuring, but still it was throwing following error: ../libntp/libntp.a(ntp_crypto_rnd.o): In function ...
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312 views

RHEL openssl conflicts

I am stuck installing PHP 5.5 (to support wordpress) on RHEL 6.3 (Santiago), I think the server was not set up correctly (contractor) and I have ended up with a copy openssl from ius as opposed to ...
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Apache2 'Server' header reports wrong openSSL version

Does anyone know where the Apache 'Server' header pulls the openSSL version from (file location/directory)? I am expecting openssl-1.0.1j but apache is reporting openssl-1.0.1g (system's openssl ...
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Error openSSL appears to lack for elliptic curve cryptography? What's that mean and how to resolve it?

I followed this step to compile Bitcoin code, but got an error. Could you please explain what the problem is and how can it be resolved? Error: [root@localhost bitcoin-0.10.0rc1]# bitcoind Error: ...
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721 views

How to generate just a key with openssl

I run this command to generate a CSR and a new key with openssl: openssl req -new -nodes -days 9000 -config /etc/ssl/openssl.cnf -out /etc/ssl/certs/mycompany.com.csr -keyout ...
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75 views

How to get certificate type from SSL Certificate of a domain?

Is there any way to get Certificate Type (EV/OV/DV) from the certificate? I tried the following command and get entire certificate at output, but can't find Certificate Type from it. $ openssl ...
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160 views

Archlinux ARM Apache server fails to start

I am currently setting up an Apache web server on my Pi running on Archlinux ARM. After installing and making the first small configurations I have tested it and it works. Then I stop the server and ...
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Can OpenSSH 6.7 optionally not depend on OpenSSL?

It has been reported on Slashdot on 2014-04-30 that OpenSSH now has a compile-time option to not depend on OpenSSL. However, OpenSSH 6.7 release notes, released on 2014-10-06, do not make any mention ...
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Trust a self signed PEM certificate

I have set up a proxy server with SSL using a PEM certificate. Now, there is a couple of machines of mine that I would like to trust this certificate automatically (without the web browser ...
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SSL (Hosted on LB) to be installed on the Downstream Apache Servers?

First, i have very basic knowledge on the SSL topic. Here is my setup. I have (1) of Public Facing Domain on LB and (2) of Internal Domains on each Web Servers. Like: ...
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GCM encryption mode for Debian 7.6

Does an option exist for AES-GCM 256bit encryption for client connections with OpenVPN? I've tried to google around this question, but found no algorithm how to patch my openvpn/openssl. So my ...
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13k views

make fatal error: openssl/sha.h: No such file or directory

I'm trying to compile a program that, according to the documentation, requires the "OpenSSL library". I have OpenSSL installed, and it's still giving me the error openssl/sha.h: No such file or ...
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283 views

How does openssl decrypt a password

I'm learning about encryption and decryption on linux and php. So I have three questions about openssl and how it generates password hashes. 1- So say I generated a password with the linux command ...
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SMTP works via Mail client but not via openssl

I'm trying to troubleshoot an SMTP issue. My credentials work fine via the OS X Mail client (and in other areas), so the credentials are definitely good. However, when I try to submit them via: ...
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151 views

CentOS 7 VPN server

How do I set up a remote internet web server using CentOS 7 so that it is completely shielded by a VPN? Here is the use case: 1.) This means that ALL requests for ANY interaction with the web ...
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openssl and OCSP

I'm trying to check the revocation of certificates in a script but I'm getting the following error: unable to load certificate 140735258465104:error:0906D06C:PEM routines:PEM_read_bio:no start ...