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package client
import (
"fmt"
"os"
"github.com/mimecast/dtail/internal/config"
"github.com/mimecast/dtail/internal/io/dlog"
"github.com/mimecast/dtail/internal/ssh"
gossh "golang.org/x/crypto/ssh"
)
const addedPathStr string = "Added path to list of auth methods, not adding further methods"
// InitSSHAuthMethods initialises all known SSH auth methods on the client side.
func InitSSHAuthMethods(sshAuthMethods []gossh.AuthMethod,
hostKeyCallback gossh.HostKeyCallback, trustAllHosts bool, throttleCh chan struct{},
privateKeyPath string, agentKeyIndex int) ([]gossh.AuthMethod, HostKeyCallback) {
if len(sshAuthMethods) > 0 {
simpleCallback, err := NewSimpleCallback()
if err != nil {
dlog.Client.FatalPanic(err)
}
return sshAuthMethods, simpleCallback
}
return initKnownHostsAuthMethods(trustAllHosts, throttleCh, privateKeyPath, agentKeyIndex)
}
func initIntegrationTestKnownHostsAuthMethods() []gossh.AuthMethod {
var sshAuthMethods []gossh.AuthMethod
privateKeyPath := "./id_rsa"
GeneratePrivatePublicKeyPairIfNotExists(privateKeyPath, 4096)
authMethod, err := ssh.PrivateKey(privateKeyPath)
if err != nil {
dlog.Client.FatalPanic("Unable to use private SSH key", privateKeyPath, err)
}
sshAuthMethods = append(sshAuthMethods, authMethod)
dlog.Client.Debug("initKnownHostsAuthMethods", addedPathStr, privateKeyPath)
return sshAuthMethods
}
func initKnownHostsAuthMethods(trustAllHosts bool, throttleCh chan struct{},
privateKeyPath string, agentKeyIndex int) ([]gossh.AuthMethod, HostKeyCallback) {
var sshAuthMethods []gossh.AuthMethod
knownHostsFile := fmt.Sprintf("%s/.ssh/known_hosts", os.Getenv("HOME"))
if config.Env("DTAIL_INTEGRATION_TEST_RUN_MODE") {
// In case of integration test, override known hosts file path.
knownHostsFile = "./known_hosts"
}
knownHostsCallback, err := NewKnownHostsCallback(knownHostsFile, trustAllHosts, throttleCh)
if err != nil {
dlog.Client.FatalPanic(knownHostsFile, err)
}
dlog.Client.Debug("initKnownHostsAuthMethods", "Added known hosts file path", knownHostsFile)
if config.Env("DTAIL_INTEGRATION_TEST_RUN_MODE") {
return initIntegrationTestKnownHostsAuthMethods(), knownHostsCallback
}
// Try to read custom private key path.
if privateKeyPath != "" {
authMethod, err := ssh.PrivateKey(privateKeyPath)
if err == nil {
sshAuthMethods = append(sshAuthMethods, authMethod)
dlog.Client.Debug("initKnownHostsAuthMethods", addedPathStr, privateKeyPath)
return sshAuthMethods, knownHostsCallback
}
dlog.Client.FatalPanic("Unable to use private SSH key", privateKeyPath, err)
}
// Second, try SSH Agent
authMethod, err := ssh.AgentWithKeyIndex(agentKeyIndex)
if err == nil {
sshAuthMethods = append(sshAuthMethods, authMethod)
dlog.Client.Debug("initKnownHostsAuthMethods", "Added SSH Agent (SSH_AUTH_SOCK)"+
"to list of auth methods, not adding further methods")
return sshAuthMethods, knownHostsCallback
}
dlog.Client.Debug("initKnownHostsAuthMethods", "Unable to init SSH Agent auth method", err)
// Third, try Linux/UNIX default key paths
privateKeyPath = os.Getenv("HOME") + "/.ssh/id_rsa"
authMethod, err = ssh.PrivateKey(privateKeyPath)
if err == nil {
sshAuthMethods = append(sshAuthMethods, authMethod)
dlog.Client.Debug("initKnownHostsAuthmethods", addedPathStr, privateKeyPath)
return sshAuthMethods, knownHostsCallback
}
dlog.Client.Debug("initKnownHostsAuthMethods", "Unable to use private key", privateKeyPath, err)
privateKeyPath = os.Getenv("HOME") + "/.ssh/id_dsa"
authMethod, err = ssh.PrivateKey(privateKeyPath)
if err == nil {
sshAuthMethods = append(sshAuthMethods, authMethod)
dlog.Client.Debug("initKnownHostsAuthmethods", addedPathStr, privateKeyPath)
return sshAuthMethods, knownHostsCallback
}
privateKeyPath = os.Getenv("HOME") + "/.ssh/id_ecdsa"
authMethod, err = ssh.PrivateKey(privateKeyPath)
if err == nil {
sshAuthMethods = append(sshAuthMethods, authMethod)
dlog.Client.Debug("initKnownHostsAuthmethods", addedPathStr, privateKeyPath)
return sshAuthMethods, knownHostsCallback
}
dlog.Client.FatalPanic("Unable to find private SSH key information", privateKeyPath, err)
// Never reach this point.
return sshAuthMethods, knownHostsCallback
}
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