/
handler.go
648 lines (551 loc) · 20.8 KB
/
handler.go
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package teams
import (
"context"
"encoding/base64"
"errors"
"fmt"
"github.com/keybase/client/go/engine"
"github.com/keybase/client/go/gregor"
"github.com/keybase/client/go/libkb"
"github.com/keybase/client/go/protocol/keybase1"
)
func HandleRotateRequest(ctx context.Context, g *libkb.GlobalContext, msg keybase1.TeamCLKRMsg) (err error) {
ctx = libkb.WithLogTag(ctx, "CLKR")
defer g.CTrace(ctx, fmt.Sprintf("HandleRotateRequest(%s,%d)", msg.TeamID, msg.Generation), func() error { return err })()
teamID := msg.TeamID
var needTeamReload bool
loadTeamArg := keybase1.LoadTeamArg{
ID: teamID,
Public: teamID.IsPublic(),
ForceRepoll: true,
}
team, err := Load(ctx, g, loadTeamArg)
if err != nil {
return err
}
isAdmin := func() bool {
role, err := team.myRole(ctx)
return err == nil && role.IsOrAbove(keybase1.TeamRole_ADMIN)
}
if len(msg.ResetUsersUntrusted) > 0 && team.IsOpen() && isAdmin() {
if needRP, err := sweepOpenTeamResetAndDeletedMembers(ctx, g, team, msg.ResetUsersUntrusted); err == nil {
// If sweepOpenTeamResetAndDeletedMembers does not do anything to
// the team, do not load team again later.
needTeamReload = needRP
}
// * NOTE * Still call the regular rotate key routine even if
// sweep succeeds and posts link.
// In normal case, it will reload team, see that generation is
// higher than one requested in CLKR (because we rotated key
// during sweeping), and then bail out.
}
return RetryOnSigOldSeqnoError(ctx, g, func(ctx context.Context, _ int) error {
if needTeamReload {
team2, err := Load(ctx, g, loadTeamArg)
if err != nil {
return err
}
team = team2
}
needTeamReload = true // subsequent calls to Load here need repoll.
if team.Generation() > msg.Generation {
g.Log.CDebugf(ctx, "current team generation %d > team.clkr generation %d, not rotating",
team.Generation(), msg.Generation)
return nil
}
g.Log.CDebugf(ctx, "rotating team %s (%s)", team.Name(), teamID)
if err := team.Rotate(ctx); err != nil {
g.Log.CDebugf(ctx, "rotating team %s (%s) error: %s", team.Name(), teamID, err)
return err
}
g.Log.CDebugf(ctx, "success rotating team %s (%s)", team.Name(), teamID)
return nil
})
}
func sweepOpenTeamResetAndDeletedMembers(ctx context.Context, g *libkb.GlobalContext,
team *Team, resetUsersUntrusted []keybase1.TeamCLKRResetUser) (needRepoll bool, err error) {
// When CLKR is invoked because of account reset and it's an open team,
// we go ahead and boot reset readers and writers out of the team. Key
// is also rotated in the process (in the same ChangeMembership link).
defer g.CTrace(ctx, "sweepOpenTeamResetAndDeletedMembers", func() error { return err })()
// Go through resetUsersUntrusted and fetch non-cached latest
// EldestSeqnos/Status.
type seqnoAndStatus struct {
eldestSeqno keybase1.Seqno
status keybase1.StatusCode
}
resetUsers := make(map[keybase1.UID]seqnoAndStatus)
for _, u := range resetUsersUntrusted {
if _, found := resetUsers[u.Uid]; found {
// User was in the list more than once.
continue
}
arg := libkb.NewLoadUserArg(g).
WithNetContext(ctx).
WithUID(u.Uid).
WithPublicKeyOptional().
WithForcePoll(true)
upak, _, err := g.GetUPAKLoader().LoadV2(arg)
if err == nil {
resetUsers[u.Uid] = seqnoAndStatus{
eldestSeqno: upak.Current.EldestSeqno,
status: upak.Current.Status,
}
} else {
g.Log.CDebugf(ctx, "Could not load uid:%s through UPAKLoader: %s", u.Uid)
}
}
err = RetryOnSigOldSeqnoError(ctx, g, func(ctx context.Context, attempt int) error {
if attempt > 0 {
var err error
team, err = Load(ctx, g, keybase1.LoadTeamArg{
ID: team.ID,
Public: team.ID.IsPublic(),
ForceRepoll: true,
})
if err != nil {
return err
}
}
changeReq := keybase1.TeamChangeReq{None: []keybase1.UserVersion{}}
// We are iterating through resetUsers map, which is map of
// uid->EldestSeqno that we loaded via UPAKLoader. Do not rely
// on server provided resetUsersUntrusted for EldestSeqnos,
// just use UIDs and see if these users are reset.
// We do not need to consider PUKless members here, because we
// are not auto-adding PUKless people to open teams (server
// doesn't send PUKless TARs in OPENREQ msg), so it shouldn't
// be an issue.
for uid, u := range resetUsers {
members := team.AllUserVersionsByUID(ctx, uid)
for _, memberUV := range members {
if memberUV.EldestSeqno == u.eldestSeqno && u.status != keybase1.StatusCode_SCDeleted {
// Member is the current incarnation of the user
// (or user has never reset).
continue
}
role, err := team.MemberRole(ctx, memberUV)
if err != nil {
continue
}
if role == keybase1.TeamRole_READER || role == keybase1.TeamRole_WRITER {
changeReq.None = append(changeReq.None, memberUV)
}
}
}
if len(changeReq.None) == 0 {
// no one to kick out
g.Log.CDebugf(ctx, "No one to remove from a CLKR list of %d users, after UPAKLoading %d of them",
len(resetUsersUntrusted), len(resetUsers))
return nil
}
g.Log.CDebugf(ctx, "Posting ChangeMembership with %d removals (CLKR list was %d)",
len(changeReq.None), len(resetUsersUntrusted))
opts := ChangeMembershipOptions{
// Make it possible for user to come back in once they reprovision.
Permanent: false,
// Coming from CLKR, we want to ensure team key is rotated.
SkipKeyRotation: false,
}
if err := team.ChangeMembershipWithOptions(ctx, changeReq, opts); err != nil {
return err
}
// Notify the caller that we posted a sig and they have to
// load team again.
needRepoll = true
return nil
})
return needRepoll, err
}
func handleChangeSingle(ctx context.Context, g *libkb.GlobalContext, row keybase1.TeamChangeRow, change keybase1.TeamChangeSet) (err error) {
change.KeyRotated = row.KeyRotated
change.MembershipChanged = row.MembershipChanged
change.Misc = row.Misc
m := libkb.NewMetaContext(ctx, g)
defer m.CTrace(fmt.Sprintf("team.handleChangeSingle(%+v, %+v)", row, change), func() error { return err })()
if err = g.GetTeamLoader().HintLatestSeqno(ctx, row.Id, row.LatestSeqno); err != nil {
m.CWarningf("error in HintLatestSeqno: %v", err)
return nil
}
if err = g.GetFastTeamLoader().HintLatestSeqno(m, row.Id, row.LatestSeqno); err != nil {
m.CWarningf("error in FastTeamLoader#HintLatestSeqno: %v", err)
err = nil // non-fatal
}
// If we're handling a rename we should also purge the resolver cache
if change.Renamed {
PurgeResolverTeamID(ctx, g, row.Id)
}
// Send teamID and teamName in two separate notifications. It is
// server-trust that they are the same team.
g.NotifyRouter.HandleTeamChangedByBothKeys(ctx, row.Id, row.Name, row.LatestSeqno, row.ImplicitTeam, change)
if change.Renamed || change.MembershipChanged || change.Misc {
// this notification is specifically for the UI
g.NotifyRouter.HandleTeamListUnverifiedChanged(ctx, row.Name)
}
if change.MembershipChanged {
g.NotifyRouter.HandleCanUserPerformChanged(ctx, row.Name)
}
return nil
}
func HandleChangeNotification(ctx context.Context, g *libkb.GlobalContext, rows []keybase1.TeamChangeRow, changes keybase1.TeamChangeSet) (err error) {
ctx = libkb.WithLogTag(ctx, "CLKR")
defer g.CTrace(ctx, "HandleChangeNotification", func() error { return err })()
for _, row := range rows {
if err := handleChangeSingle(ctx, g, row, changes); err != nil {
return err
}
}
return nil
}
func HandleDeleteNotification(ctx context.Context, g *libkb.GlobalContext, rows []keybase1.TeamChangeRow) (err error) {
defer g.CTrace(ctx, fmt.Sprintf("team.HandleDeleteNotification(%v)", len(rows)), func() error { return err })()
for _, row := range rows {
g.Log.CDebugf(ctx, "team.HandleDeleteNotification: (%+v)", row)
err := g.GetTeamLoader().Delete(ctx, row.Id)
if err != nil {
g.Log.CDebugf(ctx, "team.HandleDeleteNotification: error deleting team cache: %v", err)
}
g.NotifyRouter.HandleTeamDeleted(ctx, row.Id)
}
return nil
}
func HandleExitNotification(ctx context.Context, g *libkb.GlobalContext, rows []keybase1.TeamExitRow) (err error) {
defer g.CTrace(ctx, fmt.Sprintf("team.HandleExitNotification(%v)", len(rows)), func() error { return err })()
for _, row := range rows {
g.Log.CDebugf(ctx, "team.HandleExitNotification: (%+v)", row)
if err := g.GetTeamLoader().Delete(ctx, row.Id); err != nil {
g.Log.CDebugf(ctx, "team.HandleExitNotification: error deleting team cache: %v", err)
}
if ekLib := g.GetEKLib(); ekLib != nil {
ekLib.PurgeCachesForTeamID(ctx, row.Id)
}
g.NotifyRouter.HandleTeamExit(ctx, row.Id)
}
return nil
}
func HandleNewlyAddedToTeamNotification(ctx context.Context, g *libkb.GlobalContext, rows []keybase1.TeamNewlyAddedRow) (err error) {
defer g.CTrace(ctx, fmt.Sprintf("team.HandleNewlyAddedToTeamNotification(%v)", len(rows)), func() error { return err })()
for _, row := range rows {
g.Log.CDebugf(ctx, "team.HandleNewlyAddedToTeamNotification: (%+v)", row)
if ekLib := g.GetEKLib(); ekLib != nil {
ekLib.PurgeCachesForTeamID(ctx, row.Id)
}
g.NotifyRouter.HandleNewlyAddedToTeam(ctx, row.Id)
}
return nil
}
func HandleSBSRequest(ctx context.Context, g *libkb.GlobalContext, msg keybase1.TeamSBSMsg) (err error) {
ctx = libkb.WithLogTag(ctx, "CLKR")
defer g.CTrace(ctx, "HandleSBSRequest", func() error { return err })()
for _, invitee := range msg.Invitees {
if err := handleSBSSingle(ctx, g, msg.TeamID, invitee); err != nil {
return err
}
}
return nil
}
func handleSBSSingle(ctx context.Context, g *libkb.GlobalContext, teamID keybase1.TeamID, untrustedInviteeFromGregor keybase1.TeamInvitee) (err error) {
defer g.CTrace(ctx, fmt.Sprintf("team.handleSBSSingle(teamID: %v, invitee: %+v)", teamID, untrustedInviteeFromGregor), func() error { return err })()
return RetryOnSigOldSeqnoError(ctx, g, func(ctx context.Context, _ int) error {
team, err := Load(ctx, g, keybase1.LoadTeamArg{
ID: teamID,
Public: teamID.IsPublic(),
ForceRepoll: true,
})
if err != nil {
g.Log.CDebugf(ctx, "Load of team failed")
return err
}
// verify the invite info:
// find the invite in the team chain
invite, found := team.chain().FindActiveInviteByID(untrustedInviteeFromGregor.InviteID)
if !found {
g.Log.CDebugf(ctx, "FindActiveInviteByID failed for invite %s", untrustedInviteeFromGregor.InviteID)
return libkb.NotFoundError{}
}
g.Log.CDebugf(ctx, "Found invite: %+v", invite)
category, err := invite.Type.C()
if err != nil {
return err
}
switch category {
case keybase1.TeamInviteCategory_SBS:
// resolve assertion in link (with uid in invite msg)
ityp, err := invite.Type.String()
if err != nil {
return err
}
assertion := fmt.Sprintf("%s@%s+uid:%s", string(invite.Name), ityp, untrustedInviteeFromGregor.Uid)
arg := keybase1.Identify2Arg{
UserAssertion: assertion,
UseDelegateUI: false,
Reason: keybase1.IdentifyReason{Reason: "process team invite"},
CanSuppressUI: true,
IdentifyBehavior: keybase1.TLFIdentifyBehavior_CHAT_GUI,
}
eng := engine.NewResolveThenIdentify2(g, &arg)
m := libkb.NewMetaContext(ctx, g)
if err := engine.RunEngine2(m, eng); err != nil {
return err
}
case keybase1.TeamInviteCategory_EMAIL:
// nothing to verify, need to trust the server
case keybase1.TeamInviteCategory_KEYBASE:
// Check if UV in `untrustedInviteeFromGregor` is the same
// person as in `invite`, and that we can bring them in.
if err := assertCanAcceptKeybaseInvite(ctx, g, untrustedInviteeFromGregor, invite); err != nil {
g.Log.CDebugf(ctx, "Failed assertCanAcceptKeybaseInvite")
return err
}
default:
return fmt.Errorf("no verification implemented for invite category %s (%+v)", category, invite)
}
// It's fine to use untrustedInviteeFromGregor Uid and EldestSeqno.
// Code above verifies that Uid/Eldest passed by the server really
// belongs to crypto-person described in invite in sigchain. So
// right now untrustedInviteeFromGregor is *verified*.
verifiedInvitee := untrustedInviteeFromGregor
uv := NewUserVersion(verifiedInvitee.Uid, verifiedInvitee.EldestSeqno)
currentRole, err := team.MemberRole(ctx, uv)
if err != nil {
g.Log.CDebugf(ctx, "Failed to lookup memberRole for %+v", uv)
return err
}
if currentRole.IsOrAbove(invite.Role) {
if team.IsImplicit() {
g.Log.CDebugf(ctx, "This is implicit team SBS resolution, mooting invite %s", invite.Id)
req := keybase1.TeamChangeReq{}
req.CompletedInvites = make(SCMapInviteIDToUV)
req.CompletedInvites[invite.Id] = uv.PercentForm()
return team.ChangeMembership(ctx, req)
}
g.Log.CDebugf(ctx, "User already has same or higher role, canceling invite %s", invite.Id)
return removeInviteID(ctx, team, invite.Id)
}
tx := CreateAddMemberTx(team)
if err := tx.AddMemberBySBS(ctx, verifiedInvitee, invite.Role); err != nil {
return err
}
if err := tx.Post(libkb.NewMetaContext(ctx, g)); err != nil {
return err
}
// Send chat welcome message
if !team.IsImplicit() {
g.Log.CDebugf(ctx, "sending welcome message for successful SBS handle")
SendChatInviteWelcomeMessage(ctx, g, team.Name().String(), category, invite.Inviter.Uid,
verifiedInvitee.Uid)
}
return nil
})
}
func assertCanAcceptKeybaseInvite(ctx context.Context, g *libkb.GlobalContext, untrustedInviteeFromGregor keybase1.TeamInvitee, chainInvite keybase1.TeamInvite) error {
chainUV, err := chainInvite.KeybaseUserVersion()
if err != nil {
return err
}
if chainUV.Uid.NotEqual(untrustedInviteeFromGregor.Uid) {
return fmt.Errorf("chain keybase invite link uid %s does not match uid %s in team.sbs message", chainUV.Uid, untrustedInviteeFromGregor.Uid)
}
if chainUV.EldestSeqno.Eq(untrustedInviteeFromGregor.EldestSeqno) {
return nil
}
if chainUV.EldestSeqno == 0 {
g.Log.CDebugf(ctx, "team.sbs invitee eldest seqno: %d, allowing it to take the invite for eldest seqno 0 (reset account)", untrustedInviteeFromGregor.EldestSeqno)
return nil
}
return fmt.Errorf("chain keybase invite link eldest seqno %d does not match eldest seqno %d in team.sbs message", chainUV.EldestSeqno, untrustedInviteeFromGregor.EldestSeqno)
}
func HandleOpenTeamAccessRequest(ctx context.Context, g *libkb.GlobalContext, msg keybase1.TeamOpenReqMsg) (err error) {
ctx = libkb.WithLogTag(ctx, "CLKR")
defer g.CTrace(ctx, "HandleOpenTeamAccessRequest", func() error { return err })()
return RetryOnSigOldSeqnoError(ctx, g, func(ctx context.Context, _ int) error {
team, err := Load(ctx, g, keybase1.LoadTeamArg{
ID: msg.TeamID,
Public: msg.TeamID.IsPublic(),
ForceRepoll: true,
})
if err != nil {
return err
}
if !team.IsOpen() {
g.Log.CDebugf(ctx, "team %q is not an open team", team.Name())
return nil // Not an error - let the handler dismiss the message.
}
joinAsRole := team.chain().inner.OpenTeamJoinAs
if joinAsRole != keybase1.TeamRole_READER && joinAsRole != keybase1.TeamRole_WRITER {
return fmt.Errorf("unexpected role to add to open team: %v", joinAsRole)
}
tx := CreateAddMemberTx(team)
for _, tar := range msg.Tars {
uv := NewUserVersion(tar.Uid, tar.EldestSeqno)
err := tx.AddMemberByUV(ctx, uv, joinAsRole)
g.Log.CDebugf(ctx, "Open team request: adding %v, returned err: %v", uv, err)
}
if tx.IsEmpty() {
g.Log.CDebugf(ctx, "Nothing to do - transaction is empty")
return nil
}
return tx.Post(libkb.NewMetaContext(ctx, g))
})
}
type chatSeitanRecip struct {
inviter keybase1.UID
invitee keybase1.UID
}
func HandleTeamSeitan(ctx context.Context, g *libkb.GlobalContext, msg keybase1.TeamSeitanMsg) (err error) {
ctx = libkb.WithLogTag(ctx, "CLKR")
defer g.CTrace(ctx, "HandleTeamSeitan", func() error { return err })()
team, err := Load(ctx, g, keybase1.LoadTeamArg{
ID: msg.TeamID,
Public: msg.TeamID.IsPublic(),
ForceRepoll: true,
})
if err != nil {
return err
}
var chats []chatSeitanRecip
tx := CreateAddMemberTx(team)
for _, seitan := range msg.Seitans {
invite, found := team.chain().FindActiveInviteByID(seitan.InviteID)
if !found {
return libkb.NotFoundError{}
}
g.Log.CDebugf(ctx, "Processing Seitan acceptance for invite %s", invite.Id)
err := handleSeitanSingle(ctx, g, team, invite, seitan)
if err != nil {
g.Log.CDebugf(ctx, "Provided AKey failed to verify with error: %v; ignoring", err)
continue
}
uv := NewUserVersion(seitan.Uid, seitan.EldestSeqno)
currentRole, err := team.MemberRole(ctx, uv)
if err != nil {
g.Log.CDebugf(ctx, "Failure in team.MemberRole: %v", err)
return err
}
if currentRole.IsOrAbove(invite.Role) {
g.Log.CDebugf(ctx, "User already has same or higher role, canceling invite.")
tx.CancelInvite(invite.Id, uv.Uid)
continue
}
err = tx.AddMemberByUV(ctx, uv, invite.Role)
if err != nil {
g.Log.CDebugf(ctx, "Failed to add %v to transaction: %v", uv, err)
continue
}
// Only allow adding members as cryptomembers. Server should
// never send us PUKless users accepting seitan tokens. When
// PUKless user accepts seitan token invite status is set to
// WAITING_FOR_PUK and team_rekeyd hold on it till user gets a
// PUK and status is set to ACCEPTED.
g.Log.CDebugf(ctx, "Completing invite %s", invite.Id)
err = tx.CompleteInviteByID(ctx, invite.Id, uv)
if err != nil {
g.Log.CDebugf(ctx, "Failed to complete invite, member was added as keybase-invite: %v", err)
return err
}
chats = append(chats, chatSeitanRecip{
inviter: invite.Inviter.Uid,
invitee: seitan.Uid,
})
}
if tx.IsEmpty() {
return nil
}
err = tx.Post(libkb.NewMetaContext(ctx, g))
if err != nil {
return err
}
// Send chats
for _, chat := range chats {
g.Log.CDebugf(ctx, "sending welcome message for successful Seitan handle: inviter: %s invitee: %s",
chat.inviter, chat.invitee)
SendChatInviteWelcomeMessage(ctx, g, team.Name().String(), keybase1.TeamInviteCategory_SEITAN,
chat.inviter, chat.invitee)
}
return nil
}
func handleSeitanSingle(ctx context.Context, g *libkb.GlobalContext, team *Team, invite keybase1.TeamInvite, seitan keybase1.TeamSeitanRequest) (err error) {
category, err := invite.Type.C()
if err != nil {
return err
}
if category != keybase1.TeamInviteCategory_SEITAN {
return fmt.Errorf("HandleTeamSeitan wanted to claim an invite with category %v", category)
}
pkey, err := SeitanDecodePKey(string(invite.Name))
if err != nil {
return err
}
keyAndLabel, err := pkey.DecryptKeyAndLabel(ctx, team)
if err != nil {
return err
}
version, err := keyAndLabel.V()
if err != nil {
return fmt.Errorf("while parsing KeyAndLabel: %s", err)
}
switch version {
case keybase1.SeitanKeyAndLabelVersion_V1:
err = handleSeitanSingleV1(keyAndLabel.V1().I, invite, seitan)
case keybase1.SeitanKeyAndLabelVersion_V2:
err = handleSeitanSingleV2(keyAndLabel.V2().K, invite, seitan)
default:
return fmt.Errorf("unknown KeyAndLabel version: %v", version)
}
return err
}
func handleSeitanSingleV1(key keybase1.SeitanIKey, invite keybase1.TeamInvite, seitan keybase1.TeamSeitanRequest) (err error) {
ikey := SeitanIKey(key)
sikey, err := ikey.GenerateSIKey()
if err != nil {
return err
}
inviteID, err := sikey.GenerateTeamInviteID()
if err != nil {
return err
}
if !inviteID.Eq(invite.Id) {
return errors.New("invite ID mismatch (seitan)")
}
akey, _, err := sikey.GenerateAcceptanceKey(seitan.Uid, seitan.EldestSeqno, seitan.UnixCTime)
if err != nil {
return err
}
// Decode given AKey to be able to do secure hash comparison.
decodedAKey, err := base64.StdEncoding.DecodeString(string(seitan.Akey))
if err != nil {
return err
}
if !libkb.SecureByteArrayEq(akey, decodedAKey) {
return fmt.Errorf("did not end up with the same AKey")
}
return nil
}
func handleSeitanSingleV2(key keybase1.SeitanPubKey, invite keybase1.TeamInvite, seitan keybase1.TeamSeitanRequest) (err error) {
pubKey, err := ImportSeitanPubKey(key)
if err != nil {
return err
}
var sig SeitanSig
decodedSig, err := base64.StdEncoding.DecodeString(string(seitan.Akey)) // For V2 the server responds with sig in the akey field
if len(sig) != len(decodedSig) {
return errors.New("Signature length verification failed (seitan)")
}
copy(sig[:], decodedSig[:])
now := keybase1.Time(seitan.UnixCTime) // For V2 this is ms since the epoch, not seconds
// NOTE: Since we are re-serializing the values from seitan here to
// generate the message, if we want to change the fields present in the
// signature in the future, old clients will not be compatible.
msg, err := GenerateSeitanSignatureMessage(seitan.Uid, seitan.EldestSeqno, SCTeamInviteID(seitan.InviteID), now)
if err != nil {
return err
}
err = VerifySeitanSignatureMessage(pubKey, msg, sig)
if err != nil {
return err
}
return nil
}
func HandleForceRepollNotification(ctx context.Context, g *libkb.GlobalContext, dtime gregor.TimeOrOffset) error {
return g.GetTeamLoader().ForceRepollUntil(ctx, dtime)
}