Provided so the user can fill the challenge in a web browser.Įxample scripts are provided that generate the image using If the client does not support CAPTCHA Forms Some ejabberd modules can be configured to require a CAPTCHA challenge The page Internationalization and Localization Translation file Language.msg in ejabberd’s msgs directory.įor example, to set Russian as default language: language: ru Language: Language: The default value is en. Xml:lang, ejabberd uses the language specified in this option. The values in default configuration file are: log_rotate_size: 10485760įor example: hide_sensitive_log_data: falseĭefines the default language of server strings Setting size to X rotate log when it reaches X bytes.
Setting count to 0ĭoes not disable rotation, it instead rotates the file and keeps no previous Privacy option to disable logging of IP address or sensitive data. loglevel: Verbosity of log files generated by ejabberd.There are several toplevel options to configure logging: # Configuration of modules that are common to all vhostsĮjabberd configuration can help a lot by having the right amount of logging set up. In this example three virtual hosts have some similar modules, but thereĪre also other different modules for some specific virtual hosts: # This ejabberd server has three vhosts: Specific modules to certain virtual hosts. The global modules option with the common modules, and later add To define specific ejabberd modules in a virtual host, you can define Sql_server: "DSN=ejabberd UID=ejabberd PWD=ejabberd" While domain is using the LDAP server running on theĭomain localhost to perform authentication: host_config:ĭomain is using SQL to perform authentication whileĭomain is using the LDAP servers running on theĭomains localhost and otherhost: host_config: Options can be defined separately for every virtual host using theĭomain is using the internal authentication method When managing several XMPP domains in a single instance, those domainsĪre truly independent. Want to host multiple XMPP domains on the same instance. Of course, the hosts list can contain just one domain if you do not Single ejabberd instance, using a feature called virtual hosting.ĭefines a list containing one or more domains that Before decryption can be performed, the output must be decoded from its Base64 representation.Ejabberd supports managing several independent XMPP domains on a This resulted in a Base64 encoding of the output which is important if you wish to process the cipher with a text editor or read it into a string. When the plaintext was encrypted, we specified -base64.
There are four steps involved when decrypting: 1) Decoding the input (from Base64), 2) extracting the Salt, 3) creating the key (key-stretching) using the password and the Salt, and 4) performing the AES decryption. Unlike the command line, each step must be explicitly performed with the API. To decrypt the output of an AES encryption (aes-256-cbc) we will use the OpenSSL C++ API. The Salt is written as part of the output, and we will read it back in the next section. This is because a different (random) salt is used. This will result in a different output each time it is run. $ openssl enc -aes-256-cbc -in plaintext.txt -base64 -md sha1
We will use the password 12345 in this example. SHA1 will be used as the key-derivation function. The output will be written to standard out (the console). The following command will prompt you for a password, encrypt a file called plaintext.txt and Base64 encode the output. To encrypt a plaintext using AES with OpenSSL, the enc command is used. Command line OpenSSL uses a rather simplistic method for computing the cryptographic key from a password, which we will need to mimic using the C++ API. OpenSSL uses a hash of the password and a random 64bit salt. Key stretching uses a key-derivation function. Because humans cannot easily remember long random strings, key stretching is performed to create a long, fixed-length key from a short, variable length password. The cryptographic keys used for AES are usually fixed-length (for example, 128 or 256bit keys).
In this tutorial we will demonstrate how to encrypt plaintext using the OpenSSL command line and decrypt the cipher using the OpenSSL C++ API. Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext. AES ( Advanced Encryption Standard) is a symmetric-key encryption algorithm.