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162 lines
8.2 KiB
162 lines
8.2 KiB
package ssh_config
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// Default returns the default value for the given keyword, for example "22" if
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// the keyword is "Port". Default returns the empty string if the keyword has no
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// default, or if the keyword is unknown. Keyword matching is case-insensitive.
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//
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// Default values are provided by OpenSSH_7.4p1 on a Mac.
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func Default(keyword string) string {
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return defaults[strings.ToLower(keyword)]
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}
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// Arguments where the value must be "yes" or "no" and *only* yes or no.
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var yesnos = map[string]bool{
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strings.ToLower("BatchMode"): true,
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strings.ToLower("CanonicalizeFallbackLocal"): true,
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strings.ToLower("ChallengeResponseAuthentication"): true,
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strings.ToLower("CheckHostIP"): true,
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strings.ToLower("ClearAllForwardings"): true,
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strings.ToLower("Compression"): true,
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strings.ToLower("EnableSSHKeysign"): true,
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strings.ToLower("ExitOnForwardFailure"): true,
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strings.ToLower("ForwardAgent"): true,
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strings.ToLower("ForwardX11"): true,
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strings.ToLower("ForwardX11Trusted"): true,
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strings.ToLower("GatewayPorts"): true,
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strings.ToLower("GSSAPIAuthentication"): true,
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strings.ToLower("GSSAPIDelegateCredentials"): true,
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strings.ToLower("HostbasedAuthentication"): true,
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strings.ToLower("IdentitiesOnly"): true,
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strings.ToLower("KbdInteractiveAuthentication"): true,
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strings.ToLower("NoHostAuthenticationForLocalhost"): true,
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strings.ToLower("PasswordAuthentication"): true,
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strings.ToLower("PermitLocalCommand"): true,
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strings.ToLower("PubkeyAuthentication"): true,
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strings.ToLower("RhostsRSAAuthentication"): true,
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strings.ToLower("RSAAuthentication"): true,
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strings.ToLower("StreamLocalBindUnlink"): true,
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strings.ToLower("TCPKeepAlive"): true,
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strings.ToLower("UseKeychain"): true,
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strings.ToLower("UsePrivilegedPort"): true,
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strings.ToLower("VisualHostKey"): true,
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}
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var uints = map[string]bool{
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strings.ToLower("CanonicalizeMaxDots"): true,
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strings.ToLower("CompressionLevel"): true, // 1 to 9
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strings.ToLower("ConnectionAttempts"): true,
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strings.ToLower("ConnectTimeout"): true,
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strings.ToLower("NumberOfPasswordPrompts"): true,
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strings.ToLower("Port"): true,
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strings.ToLower("ServerAliveCountMax"): true,
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strings.ToLower("ServerAliveInterval"): true,
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}
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func mustBeYesOrNo(lkey string) bool {
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return yesnos[lkey]
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}
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func mustBeUint(lkey string) bool {
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return uints[lkey]
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}
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func validate(key, val string) error {
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lkey := strings.ToLower(key)
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if mustBeYesOrNo(lkey) && (val != "yes" && val != "no") {
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return fmt.Errorf("ssh_config: value for key %q must be 'yes' or 'no', got %q", key, val)
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}
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if mustBeUint(lkey) {
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_, err := strconv.ParseUint(val, 10, 64)
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if err != nil {
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return fmt.Errorf("ssh_config: %v", err)
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}
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}
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return nil
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}
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var defaults = map[string]string{
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strings.ToLower("AddKeysToAgent"): "no",
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strings.ToLower("AddressFamily"): "any",
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strings.ToLower("BatchMode"): "no",
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strings.ToLower("CanonicalizeFallbackLocal"): "yes",
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strings.ToLower("CanonicalizeHostname"): "no",
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strings.ToLower("CanonicalizeMaxDots"): "1",
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strings.ToLower("ChallengeResponseAuthentication"): "yes",
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strings.ToLower("CheckHostIP"): "yes",
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// TODO is this still the correct cipher
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strings.ToLower("Cipher"): "3des",
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strings.ToLower("Ciphers"): "chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc",
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strings.ToLower("ClearAllForwardings"): "no",
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strings.ToLower("Compression"): "no",
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strings.ToLower("CompressionLevel"): "6",
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strings.ToLower("ConnectionAttempts"): "1",
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strings.ToLower("ControlMaster"): "no",
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strings.ToLower("EnableSSHKeysign"): "no",
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strings.ToLower("EscapeChar"): "~",
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strings.ToLower("ExitOnForwardFailure"): "no",
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strings.ToLower("FingerprintHash"): "sha256",
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strings.ToLower("ForwardAgent"): "no",
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strings.ToLower("ForwardX11"): "no",
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strings.ToLower("ForwardX11Timeout"): "20m",
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strings.ToLower("ForwardX11Trusted"): "no",
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strings.ToLower("GatewayPorts"): "no",
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strings.ToLower("GlobalKnownHostsFile"): "/etc/ssh/ssh_known_hosts /etc/ssh/ssh_known_hosts2",
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strings.ToLower("GSSAPIAuthentication"): "no",
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strings.ToLower("GSSAPIDelegateCredentials"): "no",
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strings.ToLower("HashKnownHosts"): "no",
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strings.ToLower("HostbasedAuthentication"): "no",
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strings.ToLower("HostbasedKeyTypes"): "ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa",
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strings.ToLower("HostKeyAlgorithms"): "ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa",
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// HostName has a dynamic default (the value passed at the command line).
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strings.ToLower("IdentitiesOnly"): "no",
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strings.ToLower("IdentityFile"): "~/.ssh/identity",
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// IPQoS has a dynamic default based on interactive or non-interactive
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// sessions.
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strings.ToLower("KbdInteractiveAuthentication"): "yes",
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strings.ToLower("KexAlgorithms"): "curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1",
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strings.ToLower("LogLevel"): "INFO",
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strings.ToLower("MACs"): "umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1",
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strings.ToLower("NoHostAuthenticationForLocalhost"): "no",
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strings.ToLower("NumberOfPasswordPrompts"): "3",
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strings.ToLower("PasswordAuthentication"): "yes",
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strings.ToLower("PermitLocalCommand"): "no",
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strings.ToLower("Port"): "22",
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strings.ToLower("PreferredAuthentications"): "gssapi-with-mic,hostbased,publickey,keyboard-interactive,password",
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strings.ToLower("Protocol"): "2",
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strings.ToLower("ProxyUseFdpass"): "no",
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strings.ToLower("PubkeyAcceptedKeyTypes"): "ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa",
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strings.ToLower("PubkeyAuthentication"): "yes",
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strings.ToLower("RekeyLimit"): "default none",
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strings.ToLower("RhostsRSAAuthentication"): "no",
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strings.ToLower("RSAAuthentication"): "yes",
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strings.ToLower("ServerAliveCountMax"): "3",
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strings.ToLower("ServerAliveInterval"): "0",
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strings.ToLower("StreamLocalBindMask"): "0177",
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strings.ToLower("StreamLocalBindUnlink"): "no",
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strings.ToLower("StrictHostKeyChecking"): "ask",
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strings.ToLower("TCPKeepAlive"): "yes",
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strings.ToLower("Tunnel"): "no",
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strings.ToLower("TunnelDevice"): "any:any",
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strings.ToLower("UpdateHostKeys"): "no",
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strings.ToLower("UseKeychain"): "no",
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strings.ToLower("UsePrivilegedPort"): "no",
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strings.ToLower("UserKnownHostsFile"): "~/.ssh/known_hosts ~/.ssh/known_hosts2",
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strings.ToLower("VerifyHostKeyDNS"): "no",
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strings.ToLower("VisualHostKey"): "no",
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strings.ToLower("XAuthLocation"): "/usr/X11R6/bin/xauth",
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}
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