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f825f20d49
* Upgrade Gliderlabs SSH to 0.3.3 and add FailedConnectionCallback Following the merging of https://github.com/gliderlabs/ssh/pull/143 we can now report connections to the ssh server that have failed before public key exchange has completed using the standard fail2ban message. This PR updates Gliderlabs SSH and adds a callback that will provide this logging. Signed-off-by: Andrew Thornton <art27@cantab.net> * move the callback to its own function to make the logging appear little nicer Signed-off-by: Andrew Thornton <art27@cantab.net>
156 lines
5.0 KiB
Go
Vendored
156 lines
5.0 KiB
Go
Vendored
package ssh
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import (
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"context"
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"encoding/hex"
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"net"
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"sync"
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gossh "golang.org/x/crypto/ssh"
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)
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// contextKey is a value for use with context.WithValue. It's used as
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// a pointer so it fits in an interface{} without allocation.
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type contextKey struct {
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name string
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}
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var (
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// ContextKeyUser is a context key for use with Contexts in this package.
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// The associated value will be of type string.
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ContextKeyUser = &contextKey{"user"}
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// ContextKeySessionID is a context key for use with Contexts in this package.
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// The associated value will be of type string.
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ContextKeySessionID = &contextKey{"session-id"}
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// ContextKeyPermissions is a context key for use with Contexts in this package.
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// The associated value will be of type *Permissions.
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ContextKeyPermissions = &contextKey{"permissions"}
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// ContextKeyClientVersion is a context key for use with Contexts in this package.
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// The associated value will be of type string.
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ContextKeyClientVersion = &contextKey{"client-version"}
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// ContextKeyServerVersion is a context key for use with Contexts in this package.
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// The associated value will be of type string.
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ContextKeyServerVersion = &contextKey{"server-version"}
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// ContextKeyLocalAddr is a context key for use with Contexts in this package.
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// The associated value will be of type net.Addr.
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ContextKeyLocalAddr = &contextKey{"local-addr"}
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// ContextKeyRemoteAddr is a context key for use with Contexts in this package.
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// The associated value will be of type net.Addr.
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ContextKeyRemoteAddr = &contextKey{"remote-addr"}
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// ContextKeyServer is a context key for use with Contexts in this package.
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// The associated value will be of type *Server.
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ContextKeyServer = &contextKey{"ssh-server"}
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// ContextKeyConn is a context key for use with Contexts in this package.
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// The associated value will be of type gossh.ServerConn.
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ContextKeyConn = &contextKey{"ssh-conn"}
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// ContextKeyPublicKey is a context key for use with Contexts in this package.
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// The associated value will be of type PublicKey.
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ContextKeyPublicKey = &contextKey{"public-key"}
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)
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// Context is a package specific context interface. It exposes connection
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// metadata and allows new values to be easily written to it. It's used in
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// authentication handlers and callbacks, and its underlying context.Context is
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// exposed on Session in the session Handler. A connection-scoped lock is also
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// embedded in the context to make it easier to limit operations per-connection.
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type Context interface {
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context.Context
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sync.Locker
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// User returns the username used when establishing the SSH connection.
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User() string
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// SessionID returns the session hash.
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SessionID() string
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// ClientVersion returns the version reported by the client.
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ClientVersion() string
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// ServerVersion returns the version reported by the server.
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ServerVersion() string
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// RemoteAddr returns the remote address for this connection.
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RemoteAddr() net.Addr
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// LocalAddr returns the local address for this connection.
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LocalAddr() net.Addr
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// Permissions returns the Permissions object used for this connection.
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Permissions() *Permissions
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// SetValue allows you to easily write new values into the underlying context.
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SetValue(key, value interface{})
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}
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type sshContext struct {
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context.Context
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*sync.Mutex
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}
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func newContext(srv *Server) (*sshContext, context.CancelFunc) {
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innerCtx, cancel := context.WithCancel(context.Background())
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ctx := &sshContext{innerCtx, &sync.Mutex{}}
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ctx.SetValue(ContextKeyServer, srv)
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perms := &Permissions{&gossh.Permissions{}}
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ctx.SetValue(ContextKeyPermissions, perms)
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return ctx, cancel
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}
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// this is separate from newContext because we will get ConnMetadata
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// at different points so it needs to be applied separately
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func applyConnMetadata(ctx Context, conn gossh.ConnMetadata) {
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if ctx.Value(ContextKeySessionID) != nil {
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return
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}
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ctx.SetValue(ContextKeySessionID, hex.EncodeToString(conn.SessionID()))
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ctx.SetValue(ContextKeyClientVersion, string(conn.ClientVersion()))
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ctx.SetValue(ContextKeyServerVersion, string(conn.ServerVersion()))
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ctx.SetValue(ContextKeyUser, conn.User())
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ctx.SetValue(ContextKeyLocalAddr, conn.LocalAddr())
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ctx.SetValue(ContextKeyRemoteAddr, conn.RemoteAddr())
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}
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func (ctx *sshContext) SetValue(key, value interface{}) {
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ctx.Context = context.WithValue(ctx.Context, key, value)
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}
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func (ctx *sshContext) User() string {
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return ctx.Value(ContextKeyUser).(string)
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}
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func (ctx *sshContext) SessionID() string {
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return ctx.Value(ContextKeySessionID).(string)
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}
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func (ctx *sshContext) ClientVersion() string {
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return ctx.Value(ContextKeyClientVersion).(string)
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}
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func (ctx *sshContext) ServerVersion() string {
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return ctx.Value(ContextKeyServerVersion).(string)
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}
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func (ctx *sshContext) RemoteAddr() net.Addr {
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if addr, ok := ctx.Value(ContextKeyRemoteAddr).(net.Addr); ok {
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return addr
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}
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return nil
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}
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func (ctx *sshContext) LocalAddr() net.Addr {
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return ctx.Value(ContextKeyLocalAddr).(net.Addr)
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}
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func (ctx *sshContext) Permissions() *Permissions {
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return ctx.Value(ContextKeyPermissions).(*Permissions)
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}
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