Retrieving Jenkins Credentials passwords using Jenkins Script Console

https://github.com/tkrzeminski/jenkins-groovy-scripts/blob/master/show-all-credentials.groovy

import jenkins.model.*

import com.cloudbees.plugins.credentials.*
import com.cloudbees.plugins.credentials.impl.*
import com.cloudbees.plugins.credentials.domains.*
import com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey
import com.cloudbees.jenkins.plugins.awscredentials.AWSCredentialsImpl
import org.jenkinsci.plugins.plaincredentials.StringCredentials
import org.jenkinsci.plugins.plaincredentials.impl.FileCredentialsImpl

def showRow = {
    credentialType, secretId, username = null, password = null, description = null - >
        println("${credentialType} : ".padLeft(20) + secretId ? .padRight(38) + " | " + username ? .padRight(20) + " | " + password ? .padRight(40) + " | " + description)
}

// set Credentials domain name (null means is it global)
domainName = null

credentialsStore = Jenkins.instance.getExtensionList('com.cloudbees.plugins.credentials.SystemCredentialsProvider')[0] ? .getStore()
domain = new Domain(domainName, null, Collections. < DomainSpecification > emptyList())

credentialsStore ? .getCredentials(domain).each {
    if (it instanceof UsernamePasswordCredentialsImpl)
        showRow("user/password", it.id, it.username, it.password ? .getPlainText(), it.description)
    else if (it instanceof BasicSSHUserPrivateKey)
        showRow("ssh priv key", it.id, it.passphrase ? .getPlainText(), it.privateKeySource ? .getPrivateKey(), it.description)
    else if (it instanceof AWSCredentialsImpl)
        showRow("aws", it.id, it.accessKey, it.secretKey ? .getPlainText(), it.description)
    else if (it instanceof StringCredentials)
        showRow("secret text", it.id, it.secret ? .getPlainText(), '', it.description)
    else if (it instanceof FileCredentialsImpl)
        showRow("secret file", it.id, it.content ? .text, '', it.description)
    else
        showRow("something else", it.id, '', '', '')
}

return