updates.go 5 KB
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package irmaclient
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import (
	"encoding/json"
	"encoding/xml"
	"html"
	"io/ioutil"
	"math/big"
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	"time"
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	"github.com/credentials/irmago"
	"github.com/credentials/irmago/internal/fs"
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	"github.com/go-errors/errors"
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	"github.com/mhe/gabi"
)

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// This file contains the update mechanism for Client
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// as well as updates themselves.

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type update struct {
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	When    irma.Timestamp
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	Number  int
	Success bool
	Error   *string
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}

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var clientUpdates = []func(client *Client) error{
	func(client *Client) error {
		_, err := client.ParseAndroidStorage()
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		return err
	},
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	func(client *Client) error {
		// Adding scheme manager index, signature and public key
		// Check the signatures of all scheme managers, if any is not ok,
		// copy the entire irma_configuration folder from assets
		conf := client.Configuration
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		if len(conf.DisabledSchemeManagers) > 0 {
			return conf.CopyFromAssets(true)
		}
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		for manager := range conf.SchemeManagers {
			valid, err := conf.VerifySignature(manager)
			if err != nil || !valid {
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				return conf.CopyFromAssets(true)
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			}
		}
		return nil
	},
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}
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// update performs any function from clientUpdates that has not
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// already been executed in the past, keeping track of previously executed updates
// in the file at updatesFile.
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func (client *Client) update() error {
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	// Load and parse file containing info about already performed updates
	var err error
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	if client.updates, err = client.storage.LoadUpdates(); err != nil {
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		return err
	}

	// Perform all new updates
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	for i := len(client.updates); i < len(clientUpdates); i++ {
		err = clientUpdates[i](client)
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		u := update{
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			When:    irma.Timestamp(time.Now()),
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			Number:  i,
			Success: err == nil,
		}
		if err != nil {
			str := err.Error()
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			u.Error = &str
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		}
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		client.updates = append(client.updates, u)
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		if err != nil {
			break
		}
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	}

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	storeErr := client.storage.StoreUpdates(client.updates)
	if storeErr != nil {
		return storeErr
	}
	return err
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}

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// ParseAndroidStorage parses an Android cardemu.xml shared preferences file
// from the old Android IRMA app, parsing its credentials into the current instance,
// and saving them to storage.
// CAREFUL: this method overwrites any existing secret keys and attributes on storage.
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func (client *Client) ParseAndroidStorage() (present bool, err error) {
	if client.androidStoragePath == "" {
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		return false, nil
	}

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	cardemuXML := client.androidStoragePath + "/shared_prefs/cardemu.xml"
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	present, err = fs.PathExists(cardemuXML)
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	if err != nil || !present {
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		return
	}
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	present = true
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	bytes, err := ioutil.ReadFile(cardemuXML)
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	if err != nil {
		return
	}
	parsedxml := struct {
		Strings []struct {
			Name    string `xml:"name,attr"`
			Content string `xml:",chardata"`
		} `xml:"string"`
	}{}
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	if err = xml.Unmarshal(bytes, &parsedxml); err != nil {
		return
	}
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	parsedjson := make(map[string][]*struct {
		Signature    *gabi.CLSignature `json:"signature"`
		Pk           *gabi.PublicKey   `json:"-"`
		Attributes   []*big.Int        `json:"attributes"`
		SharedPoints []*big.Int        `json:"public_sks"`
	})
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	client.keyshareServers = make(map[irma.SchemeManagerIdentifier]*keyshareServer)
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	for _, xmltag := range parsedxml.Strings {
		if xmltag.Name == "credentials" {
			jsontag := html.UnescapeString(xmltag.Content)
			if err = json.Unmarshal([]byte(jsontag), &parsedjson); err != nil {
				return
			}
		}
		if xmltag.Name == "keyshare" {
			jsontag := html.UnescapeString(xmltag.Content)
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			if err = json.Unmarshal([]byte(jsontag), &client.keyshareServers); err != nil {
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				return
			}
		}
		if xmltag.Name == "KeyshareKeypairs" {
			jsontag := html.UnescapeString(xmltag.Content)
			keys := make([]*paillierPrivateKey, 0, 3)
			if err = json.Unmarshal([]byte(jsontag), &keys); err != nil {
				return
			}
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			client.paillierKeyCache = keys[0]
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		}
	}

	for _, list := range parsedjson {
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		client.secretkey = &secretKey{Key: list[0].Attributes[0]}
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		for _, oldcred := range list {
			gabicred := &gabi.Credential{
				Attributes: oldcred.Attributes,
				Signature:  oldcred.Signature,
			}
			if oldcred.SharedPoints != nil && len(oldcred.SharedPoints) > 0 {
				gabicred.Signature.KeyshareP = oldcred.SharedPoints[0]
			}
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			var cred *credential
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			if cred, err = newCredential(gabicred, client.Configuration); err != nil {
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				return
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			}
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			if cred.CredentialType() == nil {
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				err = errors.New("cannot add unknown credential type")
				return
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			}

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			if err = client.addCredential(cred, false); err != nil {
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				return
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			}
		}
	}

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	if len(client.credentials) > 0 {
		if err = client.storage.StoreAttributes(client.attributes); err != nil {
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			return
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		}
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		if err = client.storage.StoreSecretKey(client.secretkey); err != nil {
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			return
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		}
	}

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	if len(client.keyshareServers) > 0 {
		if err = client.storage.StoreKeyshareServers(client.keyshareServers); err != nil {
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			return
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		}
	}
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	client.UnenrolledSchemeManagers = client.unenrolledSchemeManagers()
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	if err = client.storage.StorePaillierKeys(client.paillierKeyCache); err != nil {
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		return
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	}
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	if client.paillierKeyCache == nil {
		client.paillierKey(false) // trigger calculating a new one
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	}
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	return
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}