| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package azure |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "encoding/json" |
| 8 | "fmt" |
| 9 | "io" |
| 10 | "net/http" |
| 11 | "strings" |
| 12 | |
| 13 | "github.com/netdata/netdata/go/plugins/logger" |
| 14 | "github.com/netdata/netdata/go/plugins/plugin/agent/secrets/secretstore" |
| 15 | "github.com/netdata/netdata/go/plugins/plugin/agent/secrets/secretstore/internal/httpx" |
| 16 | ) |
| 17 | |
| 18 | func (s *publishedStore) Resolve(ctx context.Context, req secretstore.ResolveRequest) (string, error) { |
| 19 | return s.resolve(ctx, req) |
| 20 | } |
| 21 | |
| 22 | func (s *publishedStore) resolve(ctx context.Context, req secretstore.ResolveRequest) (string, error) { |
| 23 | vaultName, secretName, ok := splitOperand(req.Operand) |
| 24 | if !ok { |
| 25 | return "", fmt.Errorf("resolving secret '%s': store '%s': operand must be in format 'vault-name/secret-name'", req.Original, req.StoreKey) |
| 26 | } |
| 27 | if !reAzureSafeName.MatchString(vaultName) { |
| 28 | return "", fmt.Errorf("resolving secret '%s': store '%s': invalid vault name '%s'", req.Original, req.StoreKey, vaultName) |
| 29 | } |
| 30 | if !reAzureSafeName.MatchString(secretName) { |
| 31 | return "", fmt.Errorf("resolving secret '%s': store '%s': invalid secret name '%s'", req.Original, req.StoreKey, secretName) |
| 32 | } |
| 33 | |
| 34 | token, err := s.accessToken(ctx) |
| 35 | if err != nil { |
| 36 | return "", fmt.Errorf("resolving secret '%s': store '%s': %w", req.Original, req.StoreKey, err) |
| 37 | } |
| 38 | |
| 39 | httpReq, err := http.NewRequestWithContext(ctx, http.MethodGet, fmt.Sprintf("https://%s.vault.azure.net/secrets/%s?api-version=7.4", vaultName, secretName), nil) |
| 40 | if err != nil { |
| 41 | return "", fmt.Errorf("resolving secret '%s': store '%s': creating request: %w", req.Original, req.StoreKey, err) |
| 42 | } |
| 43 | httpReq.Header.Set("Authorization", "Bearer "+token) |
| 44 | |
| 45 | resp, err := s.runtime.apiClient.Do(httpReq) |
| 46 | if err != nil { |
| 47 | return "", fmt.Errorf("resolving secret '%s': store '%s': request failed: %w", req.Original, req.StoreKey, err) |
| 48 | } |
| 49 | defer resp.Body.Close() |
| 50 | |
| 51 | body, err := io.ReadAll(io.LimitReader(resp.Body, 1<<20)) |
| 52 | if err != nil { |
| 53 | return "", fmt.Errorf("resolving secret '%s': store '%s': reading response: %w", req.Original, req.StoreKey, err) |
| 54 | } |
| 55 | if resp.StatusCode != http.StatusOK { |
| 56 | return "", fmt.Errorf("resolving secret '%s': store '%s': Azure Key Vault returned HTTP %d: %s", req.Original, req.StoreKey, resp.StatusCode, httpx.TruncateBody(body)) |
| 57 | } |
| 58 | |
| 59 | var result struct { |
| 60 | Value string `json:"value"` |
| 61 | } |
| 62 | if err := json.Unmarshal(body, &result); err != nil { |
| 63 | return "", fmt.Errorf("resolving secret '%s': store '%s': parsing response: %w", req.Original, req.StoreKey, err) |
| 64 | } |
| 65 | if result.Value == "" { |
| 66 | return "", fmt.Errorf("resolving secret '%s': store '%s': Azure Key Vault returned empty secret value", req.Original, req.StoreKey) |
| 67 | } |
| 68 | logResolvedRequest(ctx, req, vaultName, secretName) |
| 69 | return result.Value, nil |
| 70 | } |
| 71 | |
| 72 | func logResolvedRequest(ctx context.Context, req secretstore.ResolveRequest, vaultName, secretName string) { |
| 73 | if log, ok := logger.LoggerFromContext(ctx); ok { |
| 74 | log.Infof("resolved secret via azure-kv secretstore '%s' vault '%s' secret '%s'", req.StoreKey, vaultName, secretName) |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | func splitOperand(operand string) (string, string, bool) { |
| 79 | vaultName, secretName, ok := strings.Cut(operand, "/") |
| 80 | return vaultName, secretName, ok && vaultName != "" && secretName != "" |
| 81 | } |
| 82 | |
| 83 | func (s *publishedStore) accessToken(ctx context.Context) (string, error) { |
| 84 | if s.tokenProvider == nil { |
| 85 | return "", fmt.Errorf("azure token provider is not initialized") |
| 86 | } |
| 87 | |
| 88 | token, _, err := s.tokenProvider.Token(ctx) |
| 89 | if err != nil { |
| 90 | return "", fmt.Errorf("acquiring Azure Key Vault access token: %w", err) |
| 91 | } |
| 92 | return token, nil |
| 93 | } |