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Azure AD authentication for the Postgres backend (#15757)
* Add Username to sqlbk and don't leak connConfigs * Azure AD authentication for sqlbk/Postgres * Add a Postgres Config test * Cache Azure tokens, document azureBeforeConnect * Move the config test to sqlbk * go mod tidy * go get azcore azidentity
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // Copyright 2022 Gravitational, Inc | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| package postgres | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| "time" | ||
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| "github.com/Azure/azure-sdk-for-go/sdk/azcore" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/azcore/policy" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/azidentity" | ||
| "github.com/gravitational/trace" | ||
| "github.com/jackc/pgx/v4" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
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| // azureBeforeConnect will return a pgx BeforeConnect function suitable for | ||
| // Azure AD authentication. The returned function will set the password of the | ||
| // pgx.ConnConfig to a token for the relevant scope, fetching it and reusing it | ||
| // until expired (a burst of connections right at backend start is expected). If | ||
| // a client ID is provided, authentication will only be attempted as the managed | ||
| // identity with said ID rather than with all the default credentials. | ||
| func azureBeforeConnect(clientID string, log logrus.FieldLogger) (func(ctx context.Context, config *pgx.ConnConfig) error, error) { | ||
| var cred azcore.TokenCredential | ||
| if clientID != "" { | ||
| log.WithField("azure_client_id", clientID).Debug("Using Azure AD authentication with managed identity.") | ||
| c, err := azidentity.NewManagedIdentityCredential(&azidentity.ManagedIdentityCredentialOptions{ | ||
| ID: azidentity.ClientID(clientID), | ||
| }) | ||
| if err != nil { | ||
| return nil, trace.Wrap(err) | ||
| } | ||
| cred = c | ||
| } else { | ||
| log.Debug("Using Azure AD authentication with default credentials.") | ||
| c, err := azidentity.NewDefaultAzureCredential(nil) | ||
| if err != nil { | ||
| return nil, trace.Wrap(err) | ||
| } | ||
| cred = c | ||
| } | ||
|
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| var mu sync.Mutex | ||
| var cachedToken azcore.AccessToken | ||
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| beforeConnect := func(ctx context.Context, config *pgx.ConnConfig) error { | ||
| mu.Lock() | ||
| token := cachedToken | ||
| mu.Unlock() | ||
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| // to account for clock drift between us, the database, and the IDMS, | ||
| // refresh the token 10 minutes before we think it will expire | ||
| if token.ExpiresOn.After(time.Now().Add(10 * time.Minute)) { | ||
| log.WithField("ttl", time.Until(token.ExpiresOn).String()).Debug("Reusing cached Azure access token.") | ||
| config.Password = token.Token | ||
| return nil | ||
| } | ||
|
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| log.Debug("Fetching new Azure access token.") | ||
| token, err := cred.GetToken(ctx, policy.TokenRequestOptions{ | ||
| Scopes: []string{"https://ossrdbms-aad.database.windows.net/.default"}, | ||
| }) | ||
| if err != nil { | ||
| return trace.Wrap(err) | ||
| } | ||
|
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| log.WithField("ttl", time.Until(token.ExpiresOn).String()).Debug("Fetched Azure access token.") | ||
| config.Password = token.Token | ||
|
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| mu.Lock() | ||
| cachedToken = token | ||
| mu.Unlock() | ||
|
|
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| return nil | ||
| } | ||
|
|
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| return beforeConnect, nil | ||
| } |
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