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import.go
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import.go
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// Copyright 2020 the Exposure Notifications Server authors
//
// 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.
// Package exportimport imports export files into the local database
package exportimport
import (
"context"
"crypto/ecdsa"
"errors"
"fmt"
"io"
"net/http"
"time"
"github.com/google/exposure-notifications-server/internal/export"
"github.com/google/exposure-notifications-server/internal/exportimport/model"
exportproto "github.com/google/exposure-notifications-server/internal/pb/export"
pubdb "github.com/google/exposure-notifications-server/internal/publish/database"
pubmodel "github.com/google/exposure-notifications-server/internal/publish/model"
"github.com/google/exposure-notifications-server/pkg/logging"
"go.uber.org/zap"
)
var ErrArchiveNotFound = errors.New("archive file not found")
type ImportRequest struct {
config *Config
exportImport *model.ExportImport
keys []*model.ImportFilePublicKey
file *model.ImportFile
}
type ImportResponse struct {
insertedKeys uint32
revisedKeys uint32
droppedKeys uint32
}
type SignatureAndKey struct {
signature []byte
publicKey *ecdsa.PublicKey
}
func (s *Server) ImportExportFile(ctx context.Context, ir *ImportRequest) (*ImportResponse, error) {
// Special case - previous versions may have inserted the filename root as a file.
// If we find that, skip attempted processing and just mark as successful.
if ir.exportImport.ExportRoot == ir.file.ZipFilename {
return &ImportResponse{
insertedKeys: 0,
revisedKeys: 0,
droppedKeys: 0,
}, nil
}
logger := logging.FromContext(ctx)
// Download zip file.
httpClient := &http.Client{
Timeout: s.config.ExportFileDownloadTimeout,
}
req, err := http.NewRequestWithContext(ctx, "GET", ir.file.ZipFilename, nil)
if err != nil {
return nil, fmt.Errorf("failed to create request to download export file: %w", err)
}
resp, err := httpClient.Do(req)
if err != nil {
return nil, fmt.Errorf("error downloading export file: %w", err)
}
if resp.StatusCode != http.StatusOK {
if resp.StatusCode == http.StatusNotFound {
return nil, ErrArchiveNotFound
}
return nil, fmt.Errorf("unable to download file, code: %d", resp.StatusCode)
}
defer resp.Body.Close()
bytes, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading file: %w", err)
}
// Get bin and sig files.
tekExport, digest, err := export.UnmarshalExportFile(bytes)
if err != nil {
return nil, fmt.Errorf("bin data error: %w", err)
}
tekSignatures, err := export.UnmarshalSignatureFile(bytes)
if err != nil {
return nil, fmt.Errorf("signature data missing: %w", err)
}
// Index the signatures from the file.
signatures := make(map[string]*SignatureAndKey)
for _, tekSig := range tekSignatures.GetSignatures() {
idAndVersion := fmt.Sprintf("%s.%s", tekSig.SignatureInfo.GetVerificationKeyId(), tekSig.SignatureInfo.GetVerificationKeyVersion())
signatures[idAndVersion] = &SignatureAndKey{
signature: tekSig.GetSignature(),
}
}
// Join in available public keys
for _, key := range ir.keys {
idAndVersion := fmt.Sprintf("%s.%s", key.KeyID, key.KeyVersion)
if sak, ok := signatures[idAndVersion]; ok {
sak.publicKey, err = key.PublicKey()
if err != nil {
return nil, fmt.Errorf("unable to parse public key: %w", err)
}
} else {
logger.Infow("key not found...", "idAndVersion", idAndVersion)
}
}
// Validate signatures.
valid := false
for k, sig := range signatures {
if sig.publicKey == nil {
logger.Warnw("no public key for signature", "signature", sig)
continue
}
if ecdsa.VerifyASN1(sig.publicKey, digest[:], sig.signature) {
valid = true
logger.Debugw("validated signature", "file", ir.file, "kid.version", k)
break
}
}
if !valid {
return nil, fmt.Errorf("no valid signature found")
}
// Common transform settings for primary + revised keys.
exKeyTransform := transformer{
appPackageName: s.config.ImportAPKName,
importRegions: []string{ir.exportImport.Region},
traveler: ir.exportImport.Traveler,
batchTime: time.Now().UTC().Truncate(s.config.CreatedAtTruncateWindow),
truncateWindow: s.config.CreatedAtTruncateWindow,
exportImportID: ir.exportImport.ID,
importFileID: ir.file.ID,
exportImportConfig: &pubmodel.ExportImportConfig{
DefaultReportType: s.config.BackfillReportType,
BackfillSymptomOnset: s.config.BackfillDaysSinceOnset,
BackfillSymptomOnsetValue: int32(s.config.BackfillDaysSinceOnsetValue),
MaxSymptomOnsetDays: int32(s.config.MaxMagnitudeSymptomOnsetDays),
AllowClinical: true,
AllowRevoked: false,
},
logger: logger,
}
response := ImportResponse{}
// Go through primary keys and insert.
// Must be separate from revised keys in the event both are in the same file.
if len(tekExport.Keys) > 0 {
inserts, dropped := exKeyTransform.transform(tekExport.Keys)
response.droppedKeys = response.droppedKeys + dropped
template := pubdb.InsertAndReviseExposuresRequest{
SkipRevisions: true,
}
if err := s.insertAndReviseKeys(ctx, "primary", inserts, &template, &response); err != nil {
return nil, fmt.Errorf("insert primary keys: %w", err)
}
}
// Then revised keys and revise.
if len(tekExport.RevisedKeys) > 0 {
// Revoked
exKeyTransform.exportImportConfig.AllowClinical = false
exKeyTransform.exportImportConfig.AllowRevoked = true
revisions, dropped := exKeyTransform.transform(tekExport.RevisedKeys)
response.droppedKeys = response.droppedKeys + dropped
template := pubdb.InsertAndReviseExposuresRequest{
OnlyRevisions: true,
RequireToken: false,
RequireExportImportID: true,
}
if err := s.insertAndReviseKeys(ctx, "revised", revisions, &template, &response); err != nil {
return nil, fmt.Errorf("insert revised keys: %w", err)
}
}
return &response, nil
}
func (s *Server) insertAndReviseKeys(ctx context.Context, mode string, exposures []*pubmodel.Exposure, template *pubdb.InsertAndReviseExposuresRequest, response *ImportResponse) error {
logger := logging.FromContext(ctx)
length := len(exposures)
for i := 0; i < length; i = i + s.config.MaxInsertBatchSize {
upper := i + s.config.MaxInsertBatchSize
if upper > length {
upper = length
}
// Assign the current operating slice.
template.Incoming = exposures[i:upper]
insertResponse, err := s.publishDB.InsertAndReviseExposures(ctx, template)
if err != nil {
return fmt.Errorf("publishDB.InsertAndReviseExposures: %w", err)
}
logger.Infow("insertAndRevise", "mode", mode, "candidates", len(template.Incoming), "inserted", insertResponse.Inserted, "revised", insertResponse.Revised, "dropped", insertResponse.Dropped)
response.insertedKeys = response.insertedKeys + insertResponse.Inserted
response.droppedKeys = response.droppedKeys + insertResponse.Dropped
response.revisedKeys = response.revisedKeys + insertResponse.Revised
}
return nil
}
type transformer struct {
appPackageName string
importRegions []string
traveler bool
batchTime time.Time
truncateWindow time.Duration
exportImportID int64
importFileID int64
exportImportConfig *pubmodel.ExportImportConfig
logger *zap.SugaredLogger
}
func (t *transformer) transform(keys []*exportproto.TemporaryExposureKey) ([]*pubmodel.Exposure, uint32) {
inserts := make([]*pubmodel.Exposure, 0, len(keys))
var dropped uint32
for _, k := range keys {
exp, err := pubmodel.FromExportKey(k, t.exportImportConfig)
if err != nil {
t.logger.Warnw("skipping invalid key", "error", err)
dropped++
continue
}
// Fill in items that are specific to this import.
exp.AppPackageName = t.appPackageName
exp.Regions = t.importRegions
exp.Traveler = t.traveler
exp.CreatedAt = t.batchTime
exp.LocalProvenance = false
exp.ExportImportID = &t.exportImportID
exp.ImportFileID = &t.importFileID
// Adjust created at time, if this key is not yet expired.
if expTime := pubmodel.TimeForIntervalNumber(exp.IntervalNumber + exp.IntervalCount); exp.CreatedAt.Before(expTime) {
exp.CreatedAt = expTime.UTC().Add(t.truncateWindow).Truncate(t.truncateWindow)
}
inserts = append(inserts, exp)
}
return inserts, dropped
}