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feat: implement OAuth2 device flow for machine config
Fixes siderolabs#7939 See documentation in the PR for the description of the feature. Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
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204 changes: 204 additions & 0 deletions
204
internal/app/machined/pkg/runtime/v1alpha1/platform/metal/oauth2/oauth2.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,204 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
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| // Package oauth2 implements OAuth2 Device Flow to authenticate machine config download. | ||
| package oauth2 | ||
|
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| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
| "net/http" | ||
| "net/url" | ||
| "os" | ||
|
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| "github.com/cosi-project/runtime/pkg/state" | ||
| "github.com/hashicorp/go-cleanhttp" | ||
| "github.com/mdp/qrterminal/v3" | ||
| "github.com/siderolabs/go-procfs/procfs" | ||
| "golang.org/x/oauth2" | ||
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| metalurl "github.com/siderolabs/talos/internal/app/machined/pkg/runtime/v1alpha1/platform/metal/url" | ||
| "github.com/siderolabs/talos/pkg/httpdefaults" | ||
| "github.com/siderolabs/talos/pkg/machinery/constants" | ||
| ) | ||
|
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| // Config represents the OAuth2 configuration. | ||
| type Config struct { | ||
| ClientID string | ||
| ClientSecret string | ||
| Audience string | ||
| Scopes []string | ||
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| ExtraVariables []string | ||
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| DeviceAuthURL string | ||
| TokenURL string | ||
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| extraHeaders map[string]string | ||
| } | ||
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| // NewConfig returns a new Config from cmdline. | ||
| // | ||
| // If OAuth2 is not configured, it returns os.ErrNotExist. | ||
| // | ||
| //nolint:gocyclo | ||
| func NewConfig(cmdline *procfs.Cmdline, downloadURL string) (*Config, error) { | ||
| var cfg Config | ||
|
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| clientID := cmdline.Get(constants.KernelParamConfigOAuthClientID).First() | ||
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| if clientID == nil { | ||
| return nil, os.ErrNotExist | ||
| } | ||
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| cfg.ClientID = *clientID | ||
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| if clientSecret := cmdline.Get(constants.KernelParamConfigOAuthClientSecret).First(); clientSecret != nil { | ||
| cfg.ClientSecret = *clientSecret | ||
| } | ||
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| if audience := cmdline.Get(constants.KernelParamConfigOAuthAudience).First(); audience != nil { | ||
| cfg.Audience = *audience | ||
| } | ||
|
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| for i := 0; ; i++ { | ||
| scope := cmdline.Get(constants.KernelParamConfigOAuthScope).Get(i) | ||
|
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| if scope == nil { | ||
| break | ||
| } | ||
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| cfg.Scopes = append(cfg.Scopes, *scope) | ||
| } | ||
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| for i := 0; ; i++ { | ||
| extra := cmdline.Get(constants.KernelParamConfigOAuthExtraVariable).Get(i) | ||
|
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| if extra == nil { | ||
| break | ||
| } | ||
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| cfg.ExtraVariables = append(cfg.ExtraVariables, *extra) | ||
| } | ||
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| if deviceAuthURL := cmdline.Get(constants.KernelParamConfigOAuthDeviceAuthURL).First(); deviceAuthURL != nil { | ||
| cfg.DeviceAuthURL = *deviceAuthURL | ||
| } else { | ||
| u, err := url.Parse(downloadURL) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| u.Path = "/device/code" | ||
|
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| cfg.DeviceAuthURL = u.String() | ||
| } | ||
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| if tokenURL := cmdline.Get(constants.KernelParamConfigOAuthTokenURL).First(); tokenURL != nil { | ||
| cfg.TokenURL = *tokenURL | ||
| } else { | ||
| u, err := url.Parse(downloadURL) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| u.Path = "/token" | ||
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| cfg.TokenURL = u.String() | ||
| } | ||
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| return &cfg, nil | ||
| } | ||
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| // DeviceAuthFlow represents the device auth flow response. | ||
| func (c *Config) DeviceAuthFlow(ctx context.Context, st state.State) error { | ||
| transport := httpdefaults.PatchTransport(cleanhttp.DefaultTransport()) | ||
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| client := &http.Client{ | ||
| Transport: transport, | ||
| } | ||
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| // register the HTTP client with OAuth2 flow | ||
| ctx = context.WithValue(ctx, oauth2.HTTPClient, client) | ||
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| cfg := oauth2.Config{ | ||
| ClientID: c.ClientID, | ||
| Scopes: c.Scopes, | ||
| Endpoint: oauth2.Endpoint{ | ||
| DeviceAuthURL: c.DeviceAuthURL, | ||
| TokenURL: c.TokenURL, | ||
| }, | ||
| } | ||
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| log.Printf("[OAuth] starting the authentication device flow with the following settings:") | ||
| log.Printf("[OAuth] - client ID: %q", c.ClientID) | ||
| log.Printf("[OAuth] - device auth URL: %q", c.DeviceAuthURL) | ||
| log.Printf("[OAuth] - token URL: %q", c.TokenURL) | ||
| log.Printf("[OAuth] - extra variables: %q", c.ExtraVariables) | ||
|
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| // acquire device variables | ||
| variables, err := c.getVariableValues(ctx, st) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get variable values: %w", err) | ||
| } | ||
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| var deviceAuthOptions []oauth2.AuthCodeOption //nolint:prealloc | ||
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| if c.Audience != "" { | ||
| deviceAuthOptions = append(deviceAuthOptions, oauth2.SetAuthURLParam("audience", c.Audience)) | ||
| } | ||
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| for k, v := range variables { | ||
| deviceAuthOptions = append(deviceAuthOptions, oauth2.SetAuthURLParam(k, v)) | ||
| } | ||
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| deviceAuthResponse, err := cfg.DeviceAuth(ctx, deviceAuthOptions...) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get device auth response: %w", err) | ||
| } | ||
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| log.Printf("[OAuth] please visit the URL %s and enter the code %s", deviceAuthResponse.VerificationURI, deviceAuthResponse.UserCode) | ||
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| if deviceAuthResponse.VerificationURIComplete != "" { | ||
| var qrBuf bytes.Buffer | ||
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| qrterminal.GenerateHalfBlock(deviceAuthResponse.VerificationURIComplete, qrterminal.L, &qrBuf) | ||
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| log.Printf("[OAuth] or scan the following QR code:\n%s", qrBuf.String()) | ||
| } | ||
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| log.Printf("[OAuth] waiting for the device to be authorized (expires at %s)...", deviceAuthResponse.Expiry.Format("15:04:05")) | ||
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| if c.ClientSecret != "" { | ||
| deviceAuthOptions = append(deviceAuthOptions, oauth2.SetAuthURLParam("client_secret", c.ClientSecret)) | ||
| } | ||
|
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| token, err := cfg.DeviceAccessToken(ctx, deviceAuthResponse, deviceAuthOptions...) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get device access token: %w", err) | ||
| } | ||
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| log.Printf("[OAuth] device authorized successfully") | ||
|
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| c.extraHeaders = map[string]string{ | ||
| "Authorization": token.Type() + " " + token.AccessToken, | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| // getVariableValues returns the variable values to include in the device auth request. | ||
| func (c *Config) getVariableValues(ctx context.Context, st state.State) (map[string]string, error) { | ||
| ctx, cancel := context.WithTimeout(ctx, constants.ConfigLoadAttemptTimeout/2) | ||
| defer cancel() | ||
|
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| return metalurl.MapValues(ctx, st, c.ExtraVariables) | ||
| } | ||
|
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| // ExtraHeaders returns the extra headers to include in the download request. | ||
| func (c *Config) ExtraHeaders() map[string]string { | ||
| return c.extraHeaders | ||
| } |
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