feat(dir2config): defaults
This commit is contained in:
Mikaël Cluseau
789
vendor/golang.org/x/crypto/ssh/agent/client.go
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vendored
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789
vendor/golang.org/x/crypto/ssh/agent/client.go
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@ -0,0 +1,789 @@
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package agent implements the ssh-agent protocol, and provides both
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// a client and a server. The client can talk to a standard ssh-agent
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// that uses UNIX sockets, and one could implement an alternative
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// ssh-agent process using the sample server.
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//
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// References:
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// [PROTOCOL.agent]: https://tools.ietf.org/html/draft-miller-ssh-agent-00
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package agent // import "golang.org/x/crypto/ssh/agent"
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import (
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"bytes"
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"crypto/dsa"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rsa"
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"encoding/base64"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"math/big"
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"sync"
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"crypto"
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"golang.org/x/crypto/ed25519"
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"golang.org/x/crypto/ssh"
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)
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// SignatureFlags represent additional flags that can be passed to the signature
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// requests an defined in [PROTOCOL.agent] section 4.5.1.
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type SignatureFlags uint32
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// SignatureFlag values as defined in [PROTOCOL.agent] section 5.3.
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const (
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SignatureFlagReserved SignatureFlags = 1 << iota
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SignatureFlagRsaSha256
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SignatureFlagRsaSha512
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)
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// Agent represents the capabilities of an ssh-agent.
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type Agent interface {
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// List returns the identities known to the agent.
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List() ([]*Key, error)
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// Sign has the agent sign the data using a protocol 2 key as defined
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// in [PROTOCOL.agent] section 2.6.2.
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Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error)
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// Add adds a private key to the agent.
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Add(key AddedKey) error
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// Remove removes all identities with the given public key.
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Remove(key ssh.PublicKey) error
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// RemoveAll removes all identities.
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RemoveAll() error
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// Lock locks the agent. Sign and Remove will fail, and List will empty an empty list.
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Lock(passphrase []byte) error
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// Unlock undoes the effect of Lock
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Unlock(passphrase []byte) error
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// Signers returns signers for all the known keys.
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Signers() ([]ssh.Signer, error)
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}
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type ExtendedAgent interface {
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Agent
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// SignWithFlags signs like Sign, but allows for additional flags to be sent/received
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SignWithFlags(key ssh.PublicKey, data []byte, flags SignatureFlags) (*ssh.Signature, error)
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// Extension processes a custom extension request. Standard-compliant agents are not
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// required to support any extensions, but this method allows agents to implement
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// vendor-specific methods or add experimental features. See [PROTOCOL.agent] section 4.7.
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// If agent extensions are unsupported entirely this method MUST return an
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// ErrExtensionUnsupported error. Similarly, if just the specific extensionType in
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// the request is unsupported by the agent then ErrExtensionUnsupported MUST be
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// returned.
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//
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// In the case of success, since [PROTOCOL.agent] section 4.7 specifies that the contents
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// of the response are unspecified (including the type of the message), the complete
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// response will be returned as a []byte slice, including the "type" byte of the message.
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Extension(extensionType string, contents []byte) ([]byte, error)
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}
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// ConstraintExtension describes an optional constraint defined by users.
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type ConstraintExtension struct {
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// ExtensionName consist of a UTF-8 string suffixed by the
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// implementation domain following the naming scheme defined
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// in Section 4.2 of [RFC4251], e.g. "foo@example.com".
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ExtensionName string
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// ExtensionDetails contains the actual content of the extended
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// constraint.
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ExtensionDetails []byte
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}
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// AddedKey describes an SSH key to be added to an Agent.
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type AddedKey struct {
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// PrivateKey must be a *rsa.PrivateKey, *dsa.PrivateKey or
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// *ecdsa.PrivateKey, which will be inserted into the agent.
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PrivateKey interface{}
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// Certificate, if not nil, is communicated to the agent and will be
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// stored with the key.
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Certificate *ssh.Certificate
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// Comment is an optional, free-form string.
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Comment string
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// LifetimeSecs, if not zero, is the number of seconds that the
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// agent will store the key for.
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LifetimeSecs uint32
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// ConfirmBeforeUse, if true, requests that the agent confirm with the
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// user before each use of this key.
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ConfirmBeforeUse bool
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// ConstraintExtensions are the experimental or private-use constraints
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// defined by users.
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ConstraintExtensions []ConstraintExtension
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}
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// See [PROTOCOL.agent], section 3.
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const (
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agentRequestV1Identities = 1
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agentRemoveAllV1Identities = 9
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// 3.2 Requests from client to agent for protocol 2 key operations
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agentAddIdentity = 17
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agentRemoveIdentity = 18
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agentRemoveAllIdentities = 19
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agentAddIDConstrained = 25
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// 3.3 Key-type independent requests from client to agent
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agentAddSmartcardKey = 20
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agentRemoveSmartcardKey = 21
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agentLock = 22
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agentUnlock = 23
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agentAddSmartcardKeyConstrained = 26
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// 3.7 Key constraint identifiers
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agentConstrainLifetime = 1
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agentConstrainConfirm = 2
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agentConstrainExtension = 3
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)
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// maxAgentResponseBytes is the maximum agent reply size that is accepted. This
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// is a sanity check, not a limit in the spec.
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const maxAgentResponseBytes = 16 << 20
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// Agent messages:
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// These structures mirror the wire format of the corresponding ssh agent
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// messages found in [PROTOCOL.agent].
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// 3.4 Generic replies from agent to client
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const agentFailure = 5
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type failureAgentMsg struct{}
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const agentSuccess = 6
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type successAgentMsg struct{}
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// See [PROTOCOL.agent], section 2.5.2.
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const agentRequestIdentities = 11
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type requestIdentitiesAgentMsg struct{}
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// See [PROTOCOL.agent], section 2.5.2.
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const agentIdentitiesAnswer = 12
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type identitiesAnswerAgentMsg struct {
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NumKeys uint32 `sshtype:"12"`
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Keys []byte `ssh:"rest"`
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}
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// See [PROTOCOL.agent], section 2.6.2.
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const agentSignRequest = 13
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type signRequestAgentMsg struct {
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KeyBlob []byte `sshtype:"13"`
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Data []byte
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Flags uint32
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}
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// See [PROTOCOL.agent], section 2.6.2.
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// 3.6 Replies from agent to client for protocol 2 key operations
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const agentSignResponse = 14
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type signResponseAgentMsg struct {
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SigBlob []byte `sshtype:"14"`
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}
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type publicKey struct {
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Format string
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Rest []byte `ssh:"rest"`
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}
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// 3.7 Key constraint identifiers
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type constrainLifetimeAgentMsg struct {
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LifetimeSecs uint32 `sshtype:"1"`
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}
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type constrainExtensionAgentMsg struct {
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ExtensionName string `sshtype:"3"`
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ExtensionDetails []byte
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// Rest is a field used for parsing, not part of message
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Rest []byte `ssh:"rest"`
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}
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// See [PROTOCOL.agent], section 4.7
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const agentExtension = 27
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const agentExtensionFailure = 28
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// ErrExtensionUnsupported indicates that an extension defined in
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// [PROTOCOL.agent] section 4.7 is unsupported by the agent. Specifically this
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// error indicates that the agent returned a standard SSH_AGENT_FAILURE message
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// as the result of a SSH_AGENTC_EXTENSION request. Note that the protocol
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// specification (and therefore this error) does not distinguish between a
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// specific extension being unsupported and extensions being unsupported entirely.
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var ErrExtensionUnsupported = errors.New("agent: extension unsupported")
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type extensionAgentMsg struct {
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ExtensionType string `sshtype:"27"`
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Contents []byte
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}
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// Key represents a protocol 2 public key as defined in
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// [PROTOCOL.agent], section 2.5.2.
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type Key struct {
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Format string
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Blob []byte
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Comment string
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}
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func clientErr(err error) error {
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return fmt.Errorf("agent: client error: %v", err)
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}
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// String returns the storage form of an agent key with the format, base64
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// encoded serialized key, and the comment if it is not empty.
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func (k *Key) String() string {
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s := string(k.Format) + " " + base64.StdEncoding.EncodeToString(k.Blob)
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if k.Comment != "" {
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s += " " + k.Comment
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}
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return s
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}
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// Type returns the public key type.
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func (k *Key) Type() string {
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return k.Format
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}
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// Marshal returns key blob to satisfy the ssh.PublicKey interface.
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func (k *Key) Marshal() []byte {
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return k.Blob
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}
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// Verify satisfies the ssh.PublicKey interface.
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func (k *Key) Verify(data []byte, sig *ssh.Signature) error {
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pubKey, err := ssh.ParsePublicKey(k.Blob)
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if err != nil {
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return fmt.Errorf("agent: bad public key: %v", err)
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}
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return pubKey.Verify(data, sig)
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}
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type wireKey struct {
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Format string
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Rest []byte `ssh:"rest"`
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}
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func parseKey(in []byte) (out *Key, rest []byte, err error) {
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var record struct {
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Blob []byte
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Comment string
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Rest []byte `ssh:"rest"`
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}
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if err := ssh.Unmarshal(in, &record); err != nil {
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return nil, nil, err
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}
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var wk wireKey
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if err := ssh.Unmarshal(record.Blob, &wk); err != nil {
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return nil, nil, err
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}
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return &Key{
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Format: wk.Format,
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Blob: record.Blob,
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Comment: record.Comment,
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}, record.Rest, nil
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}
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// client is a client for an ssh-agent process.
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type client struct {
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// conn is typically a *net.UnixConn
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conn io.ReadWriter
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// mu is used to prevent concurrent access to the agent
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mu sync.Mutex
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}
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// NewClient returns an Agent that talks to an ssh-agent process over
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// the given connection.
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func NewClient(rw io.ReadWriter) ExtendedAgent {
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return &client{conn: rw}
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}
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// call sends an RPC to the agent. On success, the reply is
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// unmarshaled into reply and replyType is set to the first byte of
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// the reply, which contains the type of the message.
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func (c *client) call(req []byte) (reply interface{}, err error) {
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buf, err := c.callRaw(req)
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if err != nil {
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return nil, err
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}
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reply, err = unmarshal(buf)
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if err != nil {
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return nil, clientErr(err)
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}
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return reply, nil
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}
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// callRaw sends an RPC to the agent. On success, the raw
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// bytes of the response are returned; no unmarshalling is
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// performed on the response.
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func (c *client) callRaw(req []byte) (reply []byte, err error) {
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c.mu.Lock()
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defer c.mu.Unlock()
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msg := make([]byte, 4+len(req))
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binary.BigEndian.PutUint32(msg, uint32(len(req)))
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copy(msg[4:], req)
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if _, err = c.conn.Write(msg); err != nil {
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return nil, clientErr(err)
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}
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var respSizeBuf [4]byte
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if _, err = io.ReadFull(c.conn, respSizeBuf[:]); err != nil {
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return nil, clientErr(err)
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}
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respSize := binary.BigEndian.Uint32(respSizeBuf[:])
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if respSize > maxAgentResponseBytes {
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return nil, clientErr(errors.New("response too large"))
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}
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buf := make([]byte, respSize)
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if _, err = io.ReadFull(c.conn, buf); err != nil {
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return nil, clientErr(err)
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}
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return buf, nil
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}
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func (c *client) simpleCall(req []byte) error {
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resp, err := c.call(req)
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if err != nil {
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return err
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}
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if _, ok := resp.(*successAgentMsg); ok {
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return nil
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}
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return errors.New("agent: failure")
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}
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func (c *client) RemoveAll() error {
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return c.simpleCall([]byte{agentRemoveAllIdentities})
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}
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func (c *client) Remove(key ssh.PublicKey) error {
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req := ssh.Marshal(&agentRemoveIdentityMsg{
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KeyBlob: key.Marshal(),
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})
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return c.simpleCall(req)
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}
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func (c *client) Lock(passphrase []byte) error {
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req := ssh.Marshal(&agentLockMsg{
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Passphrase: passphrase,
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})
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return c.simpleCall(req)
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||||
}
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func (c *client) Unlock(passphrase []byte) error {
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req := ssh.Marshal(&agentUnlockMsg{
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||||
Passphrase: passphrase,
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||||
})
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return c.simpleCall(req)
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||||
}
|
||||
|
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// List returns the identities known to the agent.
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func (c *client) List() ([]*Key, error) {
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// see [PROTOCOL.agent] section 2.5.2.
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req := []byte{agentRequestIdentities}
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msg, err := c.call(req)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
switch msg := msg.(type) {
|
||||
case *identitiesAnswerAgentMsg:
|
||||
if msg.NumKeys > maxAgentResponseBytes/8 {
|
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return nil, errors.New("agent: too many keys in agent reply")
|
||||
}
|
||||
keys := make([]*Key, msg.NumKeys)
|
||||
data := msg.Keys
|
||||
for i := uint32(0); i < msg.NumKeys; i++ {
|
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var key *Key
|
||||
var err error
|
||||
if key, data, err = parseKey(data); err != nil {
|
||||
return nil, err
|
||||
}
|
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keys[i] = key
|
||||
}
|
||||
return keys, nil
|
||||
case *failureAgentMsg:
|
||||
return nil, errors.New("agent: failed to list keys")
|
||||
}
|
||||
panic("unreachable")
|
||||
}
|
||||
|
||||
// Sign has the agent sign the data using a protocol 2 key as defined
|
||||
// in [PROTOCOL.agent] section 2.6.2.
|
||||
func (c *client) Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error) {
|
||||
return c.SignWithFlags(key, data, 0)
|
||||
}
|
||||
|
||||
func (c *client) SignWithFlags(key ssh.PublicKey, data []byte, flags SignatureFlags) (*ssh.Signature, error) {
|
||||
req := ssh.Marshal(signRequestAgentMsg{
|
||||
KeyBlob: key.Marshal(),
|
||||
Data: data,
|
||||
Flags: uint32(flags),
|
||||
})
|
||||
|
||||
msg, err := c.call(req)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
switch msg := msg.(type) {
|
||||
case *signResponseAgentMsg:
|
||||
var sig ssh.Signature
|
||||
if err := ssh.Unmarshal(msg.SigBlob, &sig); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return &sig, nil
|
||||
case *failureAgentMsg:
|
||||
return nil, errors.New("agent: failed to sign challenge")
|
||||
}
|
||||
panic("unreachable")
|
||||
}
|
||||
|
||||
// unmarshal parses an agent message in packet, returning the parsed
|
||||
// form and the message type of packet.
|
||||
func unmarshal(packet []byte) (interface{}, error) {
|
||||
if len(packet) < 1 {
|
||||
return nil, errors.New("agent: empty packet")
|
||||
}
|
||||
var msg interface{}
|
||||
switch packet[0] {
|
||||
case agentFailure:
|
||||
return new(failureAgentMsg), nil
|
||||
case agentSuccess:
|
||||
return new(successAgentMsg), nil
|
||||
case agentIdentitiesAnswer:
|
||||
msg = new(identitiesAnswerAgentMsg)
|
||||
case agentSignResponse:
|
||||
msg = new(signResponseAgentMsg)
|
||||
case agentV1IdentitiesAnswer:
|
||||
msg = new(agentV1IdentityMsg)
|
||||
default:
|
||||
return nil, fmt.Errorf("agent: unknown type tag %d", packet[0])
|
||||
}
|
||||
if err := ssh.Unmarshal(packet, msg); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return msg, nil
|
||||
}
|
||||
|
||||
type rsaKeyMsg struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
N *big.Int
|
||||
E *big.Int
|
||||
D *big.Int
|
||||
Iqmp *big.Int // IQMP = Inverse Q Mod P
|
||||
P *big.Int
|
||||
Q *big.Int
|
||||
Comments string
|
||||
Constraints []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
type dsaKeyMsg struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
P *big.Int
|
||||
Q *big.Int
|
||||
G *big.Int
|
||||
Y *big.Int
|
||||
X *big.Int
|
||||
Comments string
|
||||
Constraints []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
type ecdsaKeyMsg struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
Curve string
|
||||
KeyBytes []byte
|
||||
D *big.Int
|
||||
Comments string
|
||||
Constraints []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
type ed25519KeyMsg struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
Pub []byte
|
||||
Priv []byte
|
||||
Comments string
|
||||
Constraints []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
// Insert adds a private key to the agent.
|
||||
func (c *client) insertKey(s interface{}, comment string, constraints []byte) error {
|
||||
var req []byte
|
||||
switch k := s.(type) {
|
||||
case *rsa.PrivateKey:
|
||||
if len(k.Primes) != 2 {
|
||||
return fmt.Errorf("agent: unsupported RSA key with %d primes", len(k.Primes))
|
||||
}
|
||||
k.Precompute()
|
||||
req = ssh.Marshal(rsaKeyMsg{
|
||||
Type: ssh.KeyAlgoRSA,
|
||||
N: k.N,
|
||||
E: big.NewInt(int64(k.E)),
|
||||
D: k.D,
|
||||
Iqmp: k.Precomputed.Qinv,
|
||||
P: k.Primes[0],
|
||||
Q: k.Primes[1],
|
||||
Comments: comment,
|
||||
Constraints: constraints,
|
||||
})
|
||||
case *dsa.PrivateKey:
|
||||
req = ssh.Marshal(dsaKeyMsg{
|
||||
Type: ssh.KeyAlgoDSA,
|
||||
P: k.P,
|
||||
Q: k.Q,
|
||||
G: k.G,
|
||||
Y: k.Y,
|
||||
X: k.X,
|
||||
Comments: comment,
|
||||
Constraints: constraints,
|
||||
})
|
||||
case *ecdsa.PrivateKey:
|
||||
nistID := fmt.Sprintf("nistp%d", k.Params().BitSize)
|
||||
req = ssh.Marshal(ecdsaKeyMsg{
|
||||
Type: "ecdsa-sha2-" + nistID,
|
||||
Curve: nistID,
|
||||
KeyBytes: elliptic.Marshal(k.Curve, k.X, k.Y),
|
||||
D: k.D,
|
||||
Comments: comment,
|
||||
Constraints: constraints,
|
||||
})
|
||||
case *ed25519.PrivateKey:
|
||||
req = ssh.Marshal(ed25519KeyMsg{
|
||||
Type: ssh.KeyAlgoED25519,
|
||||
Pub: []byte(*k)[32:],
|
||||
Priv: []byte(*k),
|
||||
Comments: comment,
|
||||
Constraints: constraints,
|
||||
})
|
||||
default:
|
||||
return fmt.Errorf("agent: unsupported key type %T", s)
|
||||
}
|
||||
|
||||
// if constraints are present then the message type needs to be changed.
|
||||
if len(constraints) != 0 {
|
||||
req[0] = agentAddIDConstrained
|
||||
}
|
||||
|
||||
resp, err := c.call(req)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if _, ok := resp.(*successAgentMsg); ok {
|
||||
return nil
|
||||
}
|
||||
return errors.New("agent: failure")
|
||||
}
|
||||
|
||||
type rsaCertMsg struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
CertBytes []byte
|
||||
D *big.Int
|
||||
Iqmp *big.Int // IQMP = Inverse Q Mod P
|
||||
P *big.Int
|
||||
Q *big.Int
|
||||
Comments string
|
||||
Constraints []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
type dsaCertMsg struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
CertBytes []byte
|
||||
X *big.Int
|
||||
Comments string
|
||||
Constraints []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
type ecdsaCertMsg struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
CertBytes []byte
|
||||
D *big.Int
|
||||
Comments string
|
||||
Constraints []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
type ed25519CertMsg struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
CertBytes []byte
|
||||
Pub []byte
|
||||
Priv []byte
|
||||
Comments string
|
||||
Constraints []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
// Add adds a private key to the agent. If a certificate is given,
|
||||
// that certificate is added instead as public key.
|
||||
func (c *client) Add(key AddedKey) error {
|
||||
var constraints []byte
|
||||
|
||||
if secs := key.LifetimeSecs; secs != 0 {
|
||||
constraints = append(constraints, ssh.Marshal(constrainLifetimeAgentMsg{secs})...)
|
||||
}
|
||||
|
||||
if key.ConfirmBeforeUse {
|
||||
constraints = append(constraints, agentConstrainConfirm)
|
||||
}
|
||||
|
||||
cert := key.Certificate
|
||||
if cert == nil {
|
||||
return c.insertKey(key.PrivateKey, key.Comment, constraints)
|
||||
}
|
||||
return c.insertCert(key.PrivateKey, cert, key.Comment, constraints)
|
||||
}
|
||||
|
||||
func (c *client) insertCert(s interface{}, cert *ssh.Certificate, comment string, constraints []byte) error {
|
||||
var req []byte
|
||||
switch k := s.(type) {
|
||||
case *rsa.PrivateKey:
|
||||
if len(k.Primes) != 2 {
|
||||
return fmt.Errorf("agent: unsupported RSA key with %d primes", len(k.Primes))
|
||||
}
|
||||
k.Precompute()
|
||||
req = ssh.Marshal(rsaCertMsg{
|
||||
Type: cert.Type(),
|
||||
CertBytes: cert.Marshal(),
|
||||
D: k.D,
|
||||
Iqmp: k.Precomputed.Qinv,
|
||||
P: k.Primes[0],
|
||||
Q: k.Primes[1],
|
||||
Comments: comment,
|
||||
Constraints: constraints,
|
||||
})
|
||||
case *dsa.PrivateKey:
|
||||
req = ssh.Marshal(dsaCertMsg{
|
||||
Type: cert.Type(),
|
||||
CertBytes: cert.Marshal(),
|
||||
X: k.X,
|
||||
Comments: comment,
|
||||
Constraints: constraints,
|
||||
})
|
||||
case *ecdsa.PrivateKey:
|
||||
req = ssh.Marshal(ecdsaCertMsg{
|
||||
Type: cert.Type(),
|
||||
CertBytes: cert.Marshal(),
|
||||
D: k.D,
|
||||
Comments: comment,
|
||||
Constraints: constraints,
|
||||
})
|
||||
case *ed25519.PrivateKey:
|
||||
req = ssh.Marshal(ed25519CertMsg{
|
||||
Type: cert.Type(),
|
||||
CertBytes: cert.Marshal(),
|
||||
Pub: []byte(*k)[32:],
|
||||
Priv: []byte(*k),
|
||||
Comments: comment,
|
||||
Constraints: constraints,
|
||||
})
|
||||
default:
|
||||
return fmt.Errorf("agent: unsupported key type %T", s)
|
||||
}
|
||||
|
||||
// if constraints are present then the message type needs to be changed.
|
||||
if len(constraints) != 0 {
|
||||
req[0] = agentAddIDConstrained
|
||||
}
|
||||
|
||||
signer, err := ssh.NewSignerFromKey(s)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if bytes.Compare(cert.Key.Marshal(), signer.PublicKey().Marshal()) != 0 {
|
||||
return errors.New("agent: signer and cert have different public key")
|
||||
}
|
||||
|
||||
resp, err := c.call(req)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if _, ok := resp.(*successAgentMsg); ok {
|
||||
return nil
|
||||
}
|
||||
return errors.New("agent: failure")
|
||||
}
|
||||
|
||||
// Signers provides a callback for client authentication.
|
||||
func (c *client) Signers() ([]ssh.Signer, error) {
|
||||
keys, err := c.List()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var result []ssh.Signer
|
||||
for _, k := range keys {
|
||||
result = append(result, &agentKeyringSigner{c, k})
|
||||
}
|
||||
return result, nil
|
||||
}
|
||||
|
||||
type agentKeyringSigner struct {
|
||||
agent *client
|
||||
pub ssh.PublicKey
|
||||
}
|
||||
|
||||
func (s *agentKeyringSigner) PublicKey() ssh.PublicKey {
|
||||
return s.pub
|
||||
}
|
||||
|
||||
func (s *agentKeyringSigner) Sign(rand io.Reader, data []byte) (*ssh.Signature, error) {
|
||||
// The agent has its own entropy source, so the rand argument is ignored.
|
||||
return s.agent.Sign(s.pub, data)
|
||||
}
|
||||
|
||||
func (s *agentKeyringSigner) SignWithOpts(rand io.Reader, data []byte, opts crypto.SignerOpts) (*ssh.Signature, error) {
|
||||
var flags SignatureFlags
|
||||
if opts != nil {
|
||||
switch opts.HashFunc() {
|
||||
case crypto.SHA256:
|
||||
flags = SignatureFlagRsaSha256
|
||||
case crypto.SHA512:
|
||||
flags = SignatureFlagRsaSha512
|
||||
}
|
||||
}
|
||||
return s.agent.SignWithFlags(s.pub, data, flags)
|
||||
}
|
||||
|
||||
// Calls an extension method. It is up to the agent implementation as to whether or not
|
||||
// any particular extension is supported and may always return an error. Because the
|
||||
// type of the response is up to the implementation, this returns the bytes of the
|
||||
// response and does not attempt any type of unmarshalling.
|
||||
func (c *client) Extension(extensionType string, contents []byte) ([]byte, error) {
|
||||
req := ssh.Marshal(extensionAgentMsg{
|
||||
ExtensionType: extensionType,
|
||||
Contents: contents,
|
||||
})
|
||||
buf, err := c.callRaw(req)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if len(buf) == 0 {
|
||||
return nil, errors.New("agent: failure; empty response")
|
||||
}
|
||||
// [PROTOCOL.agent] section 4.7 indicates that an SSH_AGENT_FAILURE message
|
||||
// represents an agent that does not support the extension
|
||||
if buf[0] == agentFailure {
|
||||
return nil, ErrExtensionUnsupported
|
||||
}
|
||||
if buf[0] == agentExtensionFailure {
|
||||
return nil, errors.New("agent: generic extension failure")
|
||||
}
|
||||
|
||||
return buf, nil
|
||||
}
|
||||
103
vendor/golang.org/x/crypto/ssh/agent/forward.go
generated
vendored
Normal file
103
vendor/golang.org/x/crypto/ssh/agent/forward.go
generated
vendored
Normal file
@ -0,0 +1,103 @@
|
||||
// Copyright 2014 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package agent
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"io"
|
||||
"net"
|
||||
"sync"
|
||||
|
||||
"golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
// RequestAgentForwarding sets up agent forwarding for the session.
|
||||
// ForwardToAgent or ForwardToRemote should be called to route
|
||||
// the authentication requests.
|
||||
func RequestAgentForwarding(session *ssh.Session) error {
|
||||
ok, err := session.SendRequest("auth-agent-req@openssh.com", true, nil)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if !ok {
|
||||
return errors.New("forwarding request denied")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// ForwardToAgent routes authentication requests to the given keyring.
|
||||
func ForwardToAgent(client *ssh.Client, keyring Agent) error {
|
||||
channels := client.HandleChannelOpen(channelType)
|
||||
if channels == nil {
|
||||
return errors.New("agent: already have handler for " + channelType)
|
||||
}
|
||||
|
||||
go func() {
|
||||
for ch := range channels {
|
||||
channel, reqs, err := ch.Accept()
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
go ssh.DiscardRequests(reqs)
|
||||
go func() {
|
||||
ServeAgent(keyring, channel)
|
||||
channel.Close()
|
||||
}()
|
||||
}
|
||||
}()
|
||||
return nil
|
||||
}
|
||||
|
||||
const channelType = "auth-agent@openssh.com"
|
||||
|
||||
// ForwardToRemote routes authentication requests to the ssh-agent
|
||||
// process serving on the given unix socket.
|
||||
func ForwardToRemote(client *ssh.Client, addr string) error {
|
||||
channels := client.HandleChannelOpen(channelType)
|
||||
if channels == nil {
|
||||
return errors.New("agent: already have handler for " + channelType)
|
||||
}
|
||||
conn, err := net.Dial("unix", addr)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
conn.Close()
|
||||
|
||||
go func() {
|
||||
for ch := range channels {
|
||||
channel, reqs, err := ch.Accept()
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
go ssh.DiscardRequests(reqs)
|
||||
go forwardUnixSocket(channel, addr)
|
||||
}
|
||||
}()
|
||||
return nil
|
||||
}
|
||||
|
||||
func forwardUnixSocket(channel ssh.Channel, addr string) {
|
||||
conn, err := net.Dial("unix", addr)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
var wg sync.WaitGroup
|
||||
wg.Add(2)
|
||||
go func() {
|
||||
io.Copy(conn, channel)
|
||||
conn.(*net.UnixConn).CloseWrite()
|
||||
wg.Done()
|
||||
}()
|
||||
go func() {
|
||||
io.Copy(channel, conn)
|
||||
channel.CloseWrite()
|
||||
wg.Done()
|
||||
}()
|
||||
|
||||
wg.Wait()
|
||||
conn.Close()
|
||||
channel.Close()
|
||||
}
|
||||
241
vendor/golang.org/x/crypto/ssh/agent/keyring.go
generated
vendored
Normal file
241
vendor/golang.org/x/crypto/ssh/agent/keyring.go
generated
vendored
Normal file
@ -0,0 +1,241 @@
|
||||
// Copyright 2014 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package agent
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"crypto/rand"
|
||||
"crypto/subtle"
|
||||
"errors"
|
||||
"fmt"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
type privKey struct {
|
||||
signer ssh.Signer
|
||||
comment string
|
||||
expire *time.Time
|
||||
}
|
||||
|
||||
type keyring struct {
|
||||
mu sync.Mutex
|
||||
keys []privKey
|
||||
|
||||
locked bool
|
||||
passphrase []byte
|
||||
}
|
||||
|
||||
var errLocked = errors.New("agent: locked")
|
||||
|
||||
// NewKeyring returns an Agent that holds keys in memory. It is safe
|
||||
// for concurrent use by multiple goroutines.
|
||||
func NewKeyring() Agent {
|
||||
return &keyring{}
|
||||
}
|
||||
|
||||
// RemoveAll removes all identities.
|
||||
func (r *keyring) RemoveAll() error {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
if r.locked {
|
||||
return errLocked
|
||||
}
|
||||
|
||||
r.keys = nil
|
||||
return nil
|
||||
}
|
||||
|
||||
// removeLocked does the actual key removal. The caller must already be holding the
|
||||
// keyring mutex.
|
||||
func (r *keyring) removeLocked(want []byte) error {
|
||||
found := false
|
||||
for i := 0; i < len(r.keys); {
|
||||
if bytes.Equal(r.keys[i].signer.PublicKey().Marshal(), want) {
|
||||
found = true
|
||||
r.keys[i] = r.keys[len(r.keys)-1]
|
||||
r.keys = r.keys[:len(r.keys)-1]
|
||||
continue
|
||||
} else {
|
||||
i++
|
||||
}
|
||||
}
|
||||
|
||||
if !found {
|
||||
return errors.New("agent: key not found")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Remove removes all identities with the given public key.
|
||||
func (r *keyring) Remove(key ssh.PublicKey) error {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
if r.locked {
|
||||
return errLocked
|
||||
}
|
||||
|
||||
return r.removeLocked(key.Marshal())
|
||||
}
|
||||
|
||||
// Lock locks the agent. Sign and Remove will fail, and List will return an empty list.
|
||||
func (r *keyring) Lock(passphrase []byte) error {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
if r.locked {
|
||||
return errLocked
|
||||
}
|
||||
|
||||
r.locked = true
|
||||
r.passphrase = passphrase
|
||||
return nil
|
||||
}
|
||||
|
||||
// Unlock undoes the effect of Lock
|
||||
func (r *keyring) Unlock(passphrase []byte) error {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
if !r.locked {
|
||||
return errors.New("agent: not locked")
|
||||
}
|
||||
if 1 != subtle.ConstantTimeCompare(passphrase, r.passphrase) {
|
||||
return fmt.Errorf("agent: incorrect passphrase")
|
||||
}
|
||||
|
||||
r.locked = false
|
||||
r.passphrase = nil
|
||||
return nil
|
||||
}
|
||||
|
||||
// expireKeysLocked removes expired keys from the keyring. If a key was added
|
||||
// with a lifetimesecs contraint and seconds >= lifetimesecs seconds have
|
||||
// ellapsed, it is removed. The caller *must* be holding the keyring mutex.
|
||||
func (r *keyring) expireKeysLocked() {
|
||||
for _, k := range r.keys {
|
||||
if k.expire != nil && time.Now().After(*k.expire) {
|
||||
r.removeLocked(k.signer.PublicKey().Marshal())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// List returns the identities known to the agent.
|
||||
func (r *keyring) List() ([]*Key, error) {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
if r.locked {
|
||||
// section 2.7: locked agents return empty.
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
r.expireKeysLocked()
|
||||
var ids []*Key
|
||||
for _, k := range r.keys {
|
||||
pub := k.signer.PublicKey()
|
||||
ids = append(ids, &Key{
|
||||
Format: pub.Type(),
|
||||
Blob: pub.Marshal(),
|
||||
Comment: k.comment})
|
||||
}
|
||||
return ids, nil
|
||||
}
|
||||
|
||||
// Insert adds a private key to the keyring. If a certificate
|
||||
// is given, that certificate is added as public key. Note that
|
||||
// any constraints given are ignored.
|
||||
func (r *keyring) Add(key AddedKey) error {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
if r.locked {
|
||||
return errLocked
|
||||
}
|
||||
signer, err := ssh.NewSignerFromKey(key.PrivateKey)
|
||||
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if cert := key.Certificate; cert != nil {
|
||||
signer, err = ssh.NewCertSigner(cert, signer)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
p := privKey{
|
||||
signer: signer,
|
||||
comment: key.Comment,
|
||||
}
|
||||
|
||||
if key.LifetimeSecs > 0 {
|
||||
t := time.Now().Add(time.Duration(key.LifetimeSecs) * time.Second)
|
||||
p.expire = &t
|
||||
}
|
||||
|
||||
r.keys = append(r.keys, p)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// Sign returns a signature for the data.
|
||||
func (r *keyring) Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error) {
|
||||
return r.SignWithFlags(key, data, 0)
|
||||
}
|
||||
|
||||
func (r *keyring) SignWithFlags(key ssh.PublicKey, data []byte, flags SignatureFlags) (*ssh.Signature, error) {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
if r.locked {
|
||||
return nil, errLocked
|
||||
}
|
||||
|
||||
r.expireKeysLocked()
|
||||
wanted := key.Marshal()
|
||||
for _, k := range r.keys {
|
||||
if bytes.Equal(k.signer.PublicKey().Marshal(), wanted) {
|
||||
if flags == 0 {
|
||||
return k.signer.Sign(rand.Reader, data)
|
||||
} else {
|
||||
if algorithmSigner, ok := k.signer.(ssh.AlgorithmSigner); !ok {
|
||||
return nil, fmt.Errorf("agent: signature does not support non-default signature algorithm: %T", k.signer)
|
||||
} else {
|
||||
var algorithm string
|
||||
switch flags {
|
||||
case SignatureFlagRsaSha256:
|
||||
algorithm = ssh.SigAlgoRSASHA2256
|
||||
case SignatureFlagRsaSha512:
|
||||
algorithm = ssh.SigAlgoRSASHA2512
|
||||
default:
|
||||
return nil, fmt.Errorf("agent: unsupported signature flags: %d", flags)
|
||||
}
|
||||
return algorithmSigner.SignWithAlgorithm(rand.Reader, data, algorithm)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil, errors.New("not found")
|
||||
}
|
||||
|
||||
// Signers returns signers for all the known keys.
|
||||
func (r *keyring) Signers() ([]ssh.Signer, error) {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
if r.locked {
|
||||
return nil, errLocked
|
||||
}
|
||||
|
||||
r.expireKeysLocked()
|
||||
s := make([]ssh.Signer, 0, len(r.keys))
|
||||
for _, k := range r.keys {
|
||||
s = append(s, k.signer)
|
||||
}
|
||||
return s, nil
|
||||
}
|
||||
|
||||
// The keyring does not support any extensions
|
||||
func (r *keyring) Extension(extensionType string, contents []byte) ([]byte, error) {
|
||||
return nil, ErrExtensionUnsupported
|
||||
}
|
||||
567
vendor/golang.org/x/crypto/ssh/agent/server.go
generated
vendored
Normal file
567
vendor/golang.org/x/crypto/ssh/agent/server.go
generated
vendored
Normal file
@ -0,0 +1,567 @@
|
||||
// Copyright 2012 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package agent
|
||||
|
||||
import (
|
||||
"crypto/dsa"
|
||||
"crypto/ecdsa"
|
||||
"crypto/elliptic"
|
||||
"crypto/rsa"
|
||||
"encoding/binary"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"log"
|
||||
"math/big"
|
||||
|
||||
"golang.org/x/crypto/ed25519"
|
||||
"golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
// Server wraps an Agent and uses it to implement the agent side of
|
||||
// the SSH-agent, wire protocol.
|
||||
type server struct {
|
||||
agent Agent
|
||||
}
|
||||
|
||||
func (s *server) processRequestBytes(reqData []byte) []byte {
|
||||
rep, err := s.processRequest(reqData)
|
||||
if err != nil {
|
||||
if err != errLocked {
|
||||
// TODO(hanwen): provide better logging interface?
|
||||
log.Printf("agent %d: %v", reqData[0], err)
|
||||
}
|
||||
return []byte{agentFailure}
|
||||
}
|
||||
|
||||
if err == nil && rep == nil {
|
||||
return []byte{agentSuccess}
|
||||
}
|
||||
|
||||
return ssh.Marshal(rep)
|
||||
}
|
||||
|
||||
func marshalKey(k *Key) []byte {
|
||||
var record struct {
|
||||
Blob []byte
|
||||
Comment string
|
||||
}
|
||||
record.Blob = k.Marshal()
|
||||
record.Comment = k.Comment
|
||||
|
||||
return ssh.Marshal(&record)
|
||||
}
|
||||
|
||||
// See [PROTOCOL.agent], section 2.5.1.
|
||||
const agentV1IdentitiesAnswer = 2
|
||||
|
||||
type agentV1IdentityMsg struct {
|
||||
Numkeys uint32 `sshtype:"2"`
|
||||
}
|
||||
|
||||
type agentRemoveIdentityMsg struct {
|
||||
KeyBlob []byte `sshtype:"18"`
|
||||
}
|
||||
|
||||
type agentLockMsg struct {
|
||||
Passphrase []byte `sshtype:"22"`
|
||||
}
|
||||
|
||||
type agentUnlockMsg struct {
|
||||
Passphrase []byte `sshtype:"23"`
|
||||
}
|
||||
|
||||
func (s *server) processRequest(data []byte) (interface{}, error) {
|
||||
switch data[0] {
|
||||
case agentRequestV1Identities:
|
||||
return &agentV1IdentityMsg{0}, nil
|
||||
|
||||
case agentRemoveAllV1Identities:
|
||||
return nil, nil
|
||||
|
||||
case agentRemoveIdentity:
|
||||
var req agentRemoveIdentityMsg
|
||||
if err := ssh.Unmarshal(data, &req); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var wk wireKey
|
||||
if err := ssh.Unmarshal(req.KeyBlob, &wk); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return nil, s.agent.Remove(&Key{Format: wk.Format, Blob: req.KeyBlob})
|
||||
|
||||
case agentRemoveAllIdentities:
|
||||
return nil, s.agent.RemoveAll()
|
||||
|
||||
case agentLock:
|
||||
var req agentLockMsg
|
||||
if err := ssh.Unmarshal(data, &req); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return nil, s.agent.Lock(req.Passphrase)
|
||||
|
||||
case agentUnlock:
|
||||
var req agentUnlockMsg
|
||||
if err := ssh.Unmarshal(data, &req); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return nil, s.agent.Unlock(req.Passphrase)
|
||||
|
||||
case agentSignRequest:
|
||||
var req signRequestAgentMsg
|
||||
if err := ssh.Unmarshal(data, &req); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var wk wireKey
|
||||
if err := ssh.Unmarshal(req.KeyBlob, &wk); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
k := &Key{
|
||||
Format: wk.Format,
|
||||
Blob: req.KeyBlob,
|
||||
}
|
||||
|
||||
var sig *ssh.Signature
|
||||
var err error
|
||||
if extendedAgent, ok := s.agent.(ExtendedAgent); ok {
|
||||
sig, err = extendedAgent.SignWithFlags(k, req.Data, SignatureFlags(req.Flags))
|
||||
} else {
|
||||
sig, err = s.agent.Sign(k, req.Data)
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return &signResponseAgentMsg{SigBlob: ssh.Marshal(sig)}, nil
|
||||
|
||||
case agentRequestIdentities:
|
||||
keys, err := s.agent.List()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
rep := identitiesAnswerAgentMsg{
|
||||
NumKeys: uint32(len(keys)),
|
||||
}
|
||||
for _, k := range keys {
|
||||
rep.Keys = append(rep.Keys, marshalKey(k)...)
|
||||
}
|
||||
return rep, nil
|
||||
|
||||
case agentAddIDConstrained, agentAddIdentity:
|
||||
return nil, s.insertIdentity(data)
|
||||
|
||||
case agentExtension:
|
||||
// Return a stub object where the whole contents of the response gets marshaled.
|
||||
var responseStub struct {
|
||||
Rest []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
if extendedAgent, ok := s.agent.(ExtendedAgent); !ok {
|
||||
// If this agent doesn't implement extensions, [PROTOCOL.agent] section 4.7
|
||||
// requires that we return a standard SSH_AGENT_FAILURE message.
|
||||
responseStub.Rest = []byte{agentFailure}
|
||||
} else {
|
||||
var req extensionAgentMsg
|
||||
if err := ssh.Unmarshal(data, &req); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
res, err := extendedAgent.Extension(req.ExtensionType, req.Contents)
|
||||
if err != nil {
|
||||
// If agent extensions are unsupported, return a standard SSH_AGENT_FAILURE
|
||||
// message as required by [PROTOCOL.agent] section 4.7.
|
||||
if err == ErrExtensionUnsupported {
|
||||
responseStub.Rest = []byte{agentFailure}
|
||||
} else {
|
||||
// As the result of any other error processing an extension request,
|
||||
// [PROTOCOL.agent] section 4.7 requires that we return a
|
||||
// SSH_AGENT_EXTENSION_FAILURE code.
|
||||
responseStub.Rest = []byte{agentExtensionFailure}
|
||||
}
|
||||
} else {
|
||||
if len(res) == 0 {
|
||||
return nil, nil
|
||||
}
|
||||
responseStub.Rest = res
|
||||
}
|
||||
}
|
||||
|
||||
return responseStub, nil
|
||||
}
|
||||
|
||||
return nil, fmt.Errorf("unknown opcode %d", data[0])
|
||||
}
|
||||
|
||||
func parseConstraints(constraints []byte) (lifetimeSecs uint32, confirmBeforeUse bool, extensions []ConstraintExtension, err error) {
|
||||
for len(constraints) != 0 {
|
||||
switch constraints[0] {
|
||||
case agentConstrainLifetime:
|
||||
lifetimeSecs = binary.BigEndian.Uint32(constraints[1:5])
|
||||
constraints = constraints[5:]
|
||||
case agentConstrainConfirm:
|
||||
confirmBeforeUse = true
|
||||
constraints = constraints[1:]
|
||||
case agentConstrainExtension:
|
||||
var msg constrainExtensionAgentMsg
|
||||
if err = ssh.Unmarshal(constraints, &msg); err != nil {
|
||||
return 0, false, nil, err
|
||||
}
|
||||
extensions = append(extensions, ConstraintExtension{
|
||||
ExtensionName: msg.ExtensionName,
|
||||
ExtensionDetails: msg.ExtensionDetails,
|
||||
})
|
||||
constraints = msg.Rest
|
||||
default:
|
||||
return 0, false, nil, fmt.Errorf("unknown constraint type: %d", constraints[0])
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func setConstraints(key *AddedKey, constraintBytes []byte) error {
|
||||
lifetimeSecs, confirmBeforeUse, constraintExtensions, err := parseConstraints(constraintBytes)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
key.LifetimeSecs = lifetimeSecs
|
||||
key.ConfirmBeforeUse = confirmBeforeUse
|
||||
key.ConstraintExtensions = constraintExtensions
|
||||
return nil
|
||||
}
|
||||
|
||||
func parseRSAKey(req []byte) (*AddedKey, error) {
|
||||
var k rsaKeyMsg
|
||||
if err := ssh.Unmarshal(req, &k); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if k.E.BitLen() > 30 {
|
||||
return nil, errors.New("agent: RSA public exponent too large")
|
||||
}
|
||||
priv := &rsa.PrivateKey{
|
||||
PublicKey: rsa.PublicKey{
|
||||
E: int(k.E.Int64()),
|
||||
N: k.N,
|
||||
},
|
||||
D: k.D,
|
||||
Primes: []*big.Int{k.P, k.Q},
|
||||
}
|
||||
priv.Precompute()
|
||||
|
||||
addedKey := &AddedKey{PrivateKey: priv, Comment: k.Comments}
|
||||
if err := setConstraints(addedKey, k.Constraints); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addedKey, nil
|
||||
}
|
||||
|
||||
func parseEd25519Key(req []byte) (*AddedKey, error) {
|
||||
var k ed25519KeyMsg
|
||||
if err := ssh.Unmarshal(req, &k); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
priv := ed25519.PrivateKey(k.Priv)
|
||||
|
||||
addedKey := &AddedKey{PrivateKey: &priv, Comment: k.Comments}
|
||||
if err := setConstraints(addedKey, k.Constraints); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addedKey, nil
|
||||
}
|
||||
|
||||
func parseDSAKey(req []byte) (*AddedKey, error) {
|
||||
var k dsaKeyMsg
|
||||
if err := ssh.Unmarshal(req, &k); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
priv := &dsa.PrivateKey{
|
||||
PublicKey: dsa.PublicKey{
|
||||
Parameters: dsa.Parameters{
|
||||
P: k.P,
|
||||
Q: k.Q,
|
||||
G: k.G,
|
||||
},
|
||||
Y: k.Y,
|
||||
},
|
||||
X: k.X,
|
||||
}
|
||||
|
||||
addedKey := &AddedKey{PrivateKey: priv, Comment: k.Comments}
|
||||
if err := setConstraints(addedKey, k.Constraints); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addedKey, nil
|
||||
}
|
||||
|
||||
func unmarshalECDSA(curveName string, keyBytes []byte, privScalar *big.Int) (priv *ecdsa.PrivateKey, err error) {
|
||||
priv = &ecdsa.PrivateKey{
|
||||
D: privScalar,
|
||||
}
|
||||
|
||||
switch curveName {
|
||||
case "nistp256":
|
||||
priv.Curve = elliptic.P256()
|
||||
case "nistp384":
|
||||
priv.Curve = elliptic.P384()
|
||||
case "nistp521":
|
||||
priv.Curve = elliptic.P521()
|
||||
default:
|
||||
return nil, fmt.Errorf("agent: unknown curve %q", curveName)
|
||||
}
|
||||
|
||||
priv.X, priv.Y = elliptic.Unmarshal(priv.Curve, keyBytes)
|
||||
if priv.X == nil || priv.Y == nil {
|
||||
return nil, errors.New("agent: point not on curve")
|
||||
}
|
||||
|
||||
return priv, nil
|
||||
}
|
||||
|
||||
func parseEd25519Cert(req []byte) (*AddedKey, error) {
|
||||
var k ed25519CertMsg
|
||||
if err := ssh.Unmarshal(req, &k); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
pubKey, err := ssh.ParsePublicKey(k.CertBytes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
priv := ed25519.PrivateKey(k.Priv)
|
||||
cert, ok := pubKey.(*ssh.Certificate)
|
||||
if !ok {
|
||||
return nil, errors.New("agent: bad ED25519 certificate")
|
||||
}
|
||||
|
||||
addedKey := &AddedKey{PrivateKey: &priv, Certificate: cert, Comment: k.Comments}
|
||||
if err := setConstraints(addedKey, k.Constraints); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addedKey, nil
|
||||
}
|
||||
|
||||
func parseECDSAKey(req []byte) (*AddedKey, error) {
|
||||
var k ecdsaKeyMsg
|
||||
if err := ssh.Unmarshal(req, &k); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
priv, err := unmarshalECDSA(k.Curve, k.KeyBytes, k.D)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
addedKey := &AddedKey{PrivateKey: priv, Comment: k.Comments}
|
||||
if err := setConstraints(addedKey, k.Constraints); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addedKey, nil
|
||||
}
|
||||
|
||||
func parseRSACert(req []byte) (*AddedKey, error) {
|
||||
var k rsaCertMsg
|
||||
if err := ssh.Unmarshal(req, &k); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
pubKey, err := ssh.ParsePublicKey(k.CertBytes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
cert, ok := pubKey.(*ssh.Certificate)
|
||||
if !ok {
|
||||
return nil, errors.New("agent: bad RSA certificate")
|
||||
}
|
||||
|
||||
// An RSA publickey as marshaled by rsaPublicKey.Marshal() in keys.go
|
||||
var rsaPub struct {
|
||||
Name string
|
||||
E *big.Int
|
||||
N *big.Int
|
||||
}
|
||||
if err := ssh.Unmarshal(cert.Key.Marshal(), &rsaPub); err != nil {
|
||||
return nil, fmt.Errorf("agent: Unmarshal failed to parse public key: %v", err)
|
||||
}
|
||||
|
||||
if rsaPub.E.BitLen() > 30 {
|
||||
return nil, errors.New("agent: RSA public exponent too large")
|
||||
}
|
||||
|
||||
priv := rsa.PrivateKey{
|
||||
PublicKey: rsa.PublicKey{
|
||||
E: int(rsaPub.E.Int64()),
|
||||
N: rsaPub.N,
|
||||
},
|
||||
D: k.D,
|
||||
Primes: []*big.Int{k.Q, k.P},
|
||||
}
|
||||
priv.Precompute()
|
||||
|
||||
addedKey := &AddedKey{PrivateKey: &priv, Certificate: cert, Comment: k.Comments}
|
||||
if err := setConstraints(addedKey, k.Constraints); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addedKey, nil
|
||||
}
|
||||
|
||||
func parseDSACert(req []byte) (*AddedKey, error) {
|
||||
var k dsaCertMsg
|
||||
if err := ssh.Unmarshal(req, &k); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
pubKey, err := ssh.ParsePublicKey(k.CertBytes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
cert, ok := pubKey.(*ssh.Certificate)
|
||||
if !ok {
|
||||
return nil, errors.New("agent: bad DSA certificate")
|
||||
}
|
||||
|
||||
// A DSA publickey as marshaled by dsaPublicKey.Marshal() in keys.go
|
||||
var w struct {
|
||||
Name string
|
||||
P, Q, G, Y *big.Int
|
||||
}
|
||||
if err := ssh.Unmarshal(cert.Key.Marshal(), &w); err != nil {
|
||||
return nil, fmt.Errorf("agent: Unmarshal failed to parse public key: %v", err)
|
||||
}
|
||||
|
||||
priv := &dsa.PrivateKey{
|
||||
PublicKey: dsa.PublicKey{
|
||||
Parameters: dsa.Parameters{
|
||||
P: w.P,
|
||||
Q: w.Q,
|
||||
G: w.G,
|
||||
},
|
||||
Y: w.Y,
|
||||
},
|
||||
X: k.X,
|
||||
}
|
||||
|
||||
addedKey := &AddedKey{PrivateKey: priv, Certificate: cert, Comment: k.Comments}
|
||||
if err := setConstraints(addedKey, k.Constraints); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addedKey, nil
|
||||
}
|
||||
|
||||
func parseECDSACert(req []byte) (*AddedKey, error) {
|
||||
var k ecdsaCertMsg
|
||||
if err := ssh.Unmarshal(req, &k); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
pubKey, err := ssh.ParsePublicKey(k.CertBytes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
cert, ok := pubKey.(*ssh.Certificate)
|
||||
if !ok {
|
||||
return nil, errors.New("agent: bad ECDSA certificate")
|
||||
}
|
||||
|
||||
// An ECDSA publickey as marshaled by ecdsaPublicKey.Marshal() in keys.go
|
||||
var ecdsaPub struct {
|
||||
Name string
|
||||
ID string
|
||||
Key []byte
|
||||
}
|
||||
if err := ssh.Unmarshal(cert.Key.Marshal(), &ecdsaPub); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
priv, err := unmarshalECDSA(ecdsaPub.ID, ecdsaPub.Key, k.D)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
addedKey := &AddedKey{PrivateKey: priv, Certificate: cert, Comment: k.Comments}
|
||||
if err := setConstraints(addedKey, k.Constraints); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addedKey, nil
|
||||
}
|
||||
|
||||
func (s *server) insertIdentity(req []byte) error {
|
||||
var record struct {
|
||||
Type string `sshtype:"17|25"`
|
||||
Rest []byte `ssh:"rest"`
|
||||
}
|
||||
|
||||
if err := ssh.Unmarshal(req, &record); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
var addedKey *AddedKey
|
||||
var err error
|
||||
|
||||
switch record.Type {
|
||||
case ssh.KeyAlgoRSA:
|
||||
addedKey, err = parseRSAKey(req)
|
||||
case ssh.KeyAlgoDSA:
|
||||
addedKey, err = parseDSAKey(req)
|
||||
case ssh.KeyAlgoECDSA256, ssh.KeyAlgoECDSA384, ssh.KeyAlgoECDSA521:
|
||||
addedKey, err = parseECDSAKey(req)
|
||||
case ssh.KeyAlgoED25519:
|
||||
addedKey, err = parseEd25519Key(req)
|
||||
case ssh.CertAlgoRSAv01:
|
||||
addedKey, err = parseRSACert(req)
|
||||
case ssh.CertAlgoDSAv01:
|
||||
addedKey, err = parseDSACert(req)
|
||||
case ssh.CertAlgoECDSA256v01, ssh.CertAlgoECDSA384v01, ssh.CertAlgoECDSA521v01:
|
||||
addedKey, err = parseECDSACert(req)
|
||||
case ssh.CertAlgoED25519v01:
|
||||
addedKey, err = parseEd25519Cert(req)
|
||||
default:
|
||||
return fmt.Errorf("agent: not implemented: %q", record.Type)
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return s.agent.Add(*addedKey)
|
||||
}
|
||||
|
||||
// ServeAgent serves the agent protocol on the given connection. It
|
||||
// returns when an I/O error occurs.
|
||||
func ServeAgent(agent Agent, c io.ReadWriter) error {
|
||||
s := &server{agent}
|
||||
|
||||
var length [4]byte
|
||||
for {
|
||||
if _, err := io.ReadFull(c, length[:]); err != nil {
|
||||
return err
|
||||
}
|
||||
l := binary.BigEndian.Uint32(length[:])
|
||||
if l > maxAgentResponseBytes {
|
||||
// We also cap requests.
|
||||
return fmt.Errorf("agent: request too large: %d", l)
|
||||
}
|
||||
|
||||
req := make([]byte, l)
|
||||
if _, err := io.ReadFull(c, req); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
repData := s.processRequestBytes(req)
|
||||
if len(repData) > maxAgentResponseBytes {
|
||||
return fmt.Errorf("agent: reply too large: %d bytes", len(repData))
|
||||
}
|
||||
|
||||
binary.BigEndian.PutUint32(length[:], uint32(len(repData)))
|
||||
if _, err := c.Write(length[:]); err != nil {
|
||||
return err
|
||||
}
|
||||
if _, err := c.Write(repData); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user