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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package connector | ||
|
|
||
| import ( | ||
| "archive/tar" | ||
| "crypto" | ||
| "crypto/rsa" | ||
| "crypto/sha256" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
|
|
||
| dockerclient "github.com/docker/docker/client" | ||
| gliderssh "github.com/gliderlabs/ssh" | ||
| "github.com/shellhub-io/shellhub/pkg/agent/server/modes" | ||
| "github.com/shellhub-io/shellhub/pkg/api/client" | ||
| "github.com/shellhub-io/shellhub/pkg/models" | ||
| gossh "golang.org/x/crypto/ssh" | ||
| ) | ||
|
|
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| // NOTICE: Ensures the Authenticator interface is implemented. | ||
| var _ modes.Authenticator = (*Authenticator)(nil) | ||
|
|
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| // Authenticator implements the Authenticator interface when the server is running in connector mode. | ||
| type Authenticator struct { | ||
| // api is a client to communicate with the ShellHub's API. | ||
| api client.Client | ||
| // authData is the authentication data received from the API to authenticate the device. | ||
| authData *models.DeviceAuthResponse | ||
| // container is the device name. | ||
| // | ||
| // NOTICE: Uses a pointer for later assignment. | ||
| container *string | ||
| docker dockerclient.APIClient | ||
| } | ||
|
|
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| // NewAuthenticator creates a new instance of Authenticator for the connector mode. | ||
| func NewAuthenticator(api client.Client, docker dockerclient.APIClient, authData *models.DeviceAuthResponse, container *string) *Authenticator { | ||
| return &Authenticator{ | ||
| api: api, | ||
| authData: authData, | ||
| container: container, | ||
| docker: docker, | ||
| } | ||
| } | ||
|
|
||
| // Password handles the server's SSH password authentication when server is running in connector mode. | ||
| func (a *Authenticator) Password(ctx gliderssh.Context, username string, password string) bool { | ||
| passwdTar, _, _ := a.docker.CopyFromContainer(ctx, *a.container, "/etc/passwd") | ||
| passwd := tar.NewReader(passwdTar) | ||
| passwd.Next() //nolint:errcheck | ||
|
|
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| user, err := LookupUserDocker(username, passwd) | ||
| if err != nil { | ||
| return false | ||
| } | ||
|
|
||
| if user.Password == "" { | ||
| // NOTICE(r): when the user doesn't have password, we block the login. | ||
| return false | ||
| } | ||
|
|
||
| shadowTar, _, _ := a.docker.CopyFromContainer(ctx, *a.container, "/etc/shadow") | ||
| shadow := tar.NewReader(shadowTar) | ||
| shadow.Next() //nolint:errcheck | ||
|
|
||
| return authUser(username, password, shadow) | ||
| } | ||
|
|
||
| // PublicKey handles the server's SSH public key authentication when server is running in connector mode. | ||
| func (a *Authenticator) PublicKey(ctx gliderssh.Context, username string, key gliderssh.PublicKey) bool { | ||
| type Signature struct { | ||
| Username string | ||
| Namespace string | ||
| } | ||
|
|
||
| sig := &Signature{ | ||
| Username: username, | ||
| Namespace: *a.container, | ||
| } | ||
|
|
||
| sigBytes, err := json.Marshal(sig) | ||
| if err != nil { | ||
| return false | ||
| } | ||
|
|
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| sigHash := sha256.Sum256(sigBytes) | ||
|
|
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| res, err := a.api.AuthPublicKey(&models.PublicKeyAuthRequest{ | ||
| Fingerprint: gossh.FingerprintLegacyMD5(key), | ||
| Data: string(sigBytes), | ||
| }, a.authData.Token) | ||
| if err != nil { | ||
| return false | ||
| } | ||
|
|
||
| digest, err := base64.StdEncoding.DecodeString(res.Signature) | ||
| if err != nil { | ||
| return false | ||
| } | ||
|
|
||
| cryptoKey, ok := key.(gossh.CryptoPublicKey) | ||
| if !ok { | ||
| return false | ||
| } | ||
|
|
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| pubCrypto := cryptoKey.CryptoPublicKey() | ||
|
|
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| pubKey, ok := pubCrypto.(*rsa.PublicKey) | ||
| if !ok { | ||
| return false | ||
| } | ||
|
|
||
| if err = rsa.VerifyPKCS1v15(pubKey, crypto.SHA256, sigHash[:], digest); err != nil { | ||
| return false | ||
| } | ||
|
|
||
| return true | ||
| } |
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