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handler.go
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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), &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() {
// NOTE: One day, this code path will be unused. Server should not
// issue CLKRs with ResetUsersUntrusted for open teams. Instead, there
// is a new work type to sweep reset users: OPENSWEEP. See
// `HandleOpenTeamSweepRequest`.
// Even though this is open team, and we are aiming to not rotate them,
// the server asked us specifically to do so with this CLKR. We have to
// obey, otherwise that CLKR will stay undone and server will keep
// asking users to rotate.
postedLink, err := sweepOpenTeamResetAndDeletedMembers(ctx, g, team, msg.ResetUsersUntrusted, true /* rotate */)
if err != nil {
g.Log.CDebugf(ctx, "Failed to sweep deleted members: %s", err)
} else {
// If sweepOpenTeamResetAndDeletedMembers does not do anything to
// the team, do not load team again later. Otherwise, if new link
// was posted, we need to reload.
needTeamReload = postedLink
}
// * 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 RetryIfPossible(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)
rotationType := keybase1.RotationType_CLKR
if teamID.IsPublic() {
rotationType = keybase1.RotationType_VISIBLE
}
if err := team.Rotate(ctx, rotationType); 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 HandleOpenTeamSweepRequest(ctx context.Context, g *libkb.GlobalContext, msg keybase1.TeamOpenSweepMsg) (err error) {
ctx = libkb.WithLogTag(ctx, "CLKR")
defer g.CTrace(ctx, fmt.Sprintf("HandleOpenTeamSweepRequest(teamID=%s,len(resetUsers)=%d)", msg.TeamID, len(msg.ResetUsersUntrusted)), &err)()
team, err := Load(ctx, g, keybase1.LoadTeamArg{
ID: msg.TeamID,
Public: msg.TeamID.IsPublic(),
ForceRepoll: true,
})
if err != nil {
return err
}
if !team.IsOpen() {
return fmt.Errorf("OpenSweep request for team %s that is not open", team.ID)
}
role, err := team.myRole(ctx)
if err != nil {
return err
}
if !role.IsOrAbove(keybase1.TeamRole_ADMIN) {
return fmt.Errorf("OpenSweep request for team %s but our role is: %s", team.ID, role.String())
}
rotate := !team.CanSkipKeyRotation()
_, err = sweepOpenTeamResetAndDeletedMembers(ctx, g, team, msg.ResetUsersUntrusted, rotate)
return err
}
func sweepOpenTeamResetAndDeletedMembers(ctx context.Context, g *libkb.GlobalContext,
team *Team, resetUsersUntrusted []keybase1.TeamCLKRResetUser, rotate bool) (postedLink 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, fmt.Sprintf("sweepOpenTeamResetAndDeletedMembers(rotate=%t)", rotate),
&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 = RetryIfPossible(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
}
switch role {
case
keybase1.TeamRole_RESTRICTEDBOT,
keybase1.TeamRole_BOT,
keybase1.TeamRole_READER,
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,
SkipKeyRotation: !rotate,
}
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.
postedLink = true
return nil
})
return postedLink, err
}
func invalidateCaches(mctx libkb.MetaContext, teamID keybase1.TeamID) {
// refresh the KBFS Favorites cache since it no longer should contain
// this team.
mctx.G().NotifyRouter.HandleFavoritesChanged(mctx.G().GetMyUID())
if ekLib := mctx.G().GetEKLib(); ekLib != nil {
ekLib.PurgeTeamEKCachesForTeamID(mctx, teamID)
ekLib.PurgeTeambotEKCachesForTeamID(mctx, teamID)
}
if keyer := mctx.G().GetTeambotMemberKeyer(); keyer != nil {
keyer.PurgeCache(mctx)
}
}
func handleChangeSingle(ctx context.Context, g *libkb.GlobalContext, row keybase1.TeamChangeRow, change keybase1.TeamChangeSet) (changedMetadata bool, err error) {
change.KeyRotated = row.KeyRotated
change.MembershipChanged = row.MembershipChanged
change.Misc = row.Misc
mctx := libkb.NewMetaContext(ctx, g)
defer mctx.Trace(fmt.Sprintf("team.handleChangeSingle [%s] (%+v, %+v)", g.Env.GetUsername(), row, change),
&err)()
// Any errors are already logged in their respective functions.
_ = HintLatestSeqno(mctx, row.Id, row.LatestSeqno)
_ = HintLatestHiddenSeqno(mctx, row.Id, row.LatestHiddenSeqno)
// If we're handling a rename we should also purge the resolver cache and
// the KBFS favorites cache
if change.Renamed {
if err = PurgeResolverTeamID(ctx, g, row.Id); err != nil {
mctx.Warning("error in PurgeResolverTeamID: %v", err)
err = nil // non-fatal
}
invalidateCaches(mctx, 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,
row.LatestHiddenSeqno, row.LatestOffchainSeqno, keybase1.TeamChangedSource_SERVER)
// Note we only get updates about new subteams we create because the flow
// is that we join the team as an admin when we create them and then
// immediately leave.
if change.Renamed || change.MembershipChanged || change.Misc {
changedMetadata = true
}
if change.MembershipChanged {
g.NotifyRouter.HandleCanUserPerformChanged(ctx, row.Name)
}
return changedMetadata, nil
}
func HandleChangeNotification(ctx context.Context, g *libkb.GlobalContext, rows []keybase1.TeamChangeRow, changes keybase1.TeamChangeSet) (err error) {
ctx = libkb.WithLogTag(ctx, "THCN")
defer g.CTrace(ctx, "HandleChangeNotification", &err)()
var anyChangedMetadata bool
for _, row := range rows {
if changedMetadata, err := handleChangeSingle(ctx, g, row, changes); err != nil {
return err
} else if changedMetadata {
anyChangedMetadata = true
}
}
if anyChangedMetadata {
g.NotifyRouter.HandleTeamMetadataUpdate(ctx)
}
return nil
}
func HandleTeamMemberShowcaseChange(ctx context.Context, g *libkb.GlobalContext) (err error) {
defer g.CTrace(ctx, "HandleTeamMemberShowcaseChange", &err)()
g.NotifyRouter.HandleTeamMetadataUpdate(ctx)
return nil
}
func HandleDeleteNotification(ctx context.Context, g *libkb.GlobalContext, rows []keybase1.TeamChangeRow) (err error) {
mctx := libkb.NewMetaContext(ctx, g)
defer mctx.Trace(fmt.Sprintf("team.HandleDeleteNotification(%v)", len(rows)),
&err)()
g.NotifyRouter.HandleTeamMetadataUpdate(ctx)
for _, row := range rows {
g.Log.CDebugf(ctx, "team.HandleDeleteNotification: (%+v)", row)
if err := TombstoneTeam(libkb.NewMetaContext(ctx, g), row.Id); err != nil {
g.Log.CDebugf(ctx, "team.HandleDeleteNotification: failed to Tombstone: %s", err)
}
invalidateCaches(mctx, row.Id)
g.NotifyRouter.HandleTeamDeleted(ctx, row.Id)
}
return nil
}
func HandleExitNotification(ctx context.Context, g *libkb.GlobalContext, rows []keybase1.TeamExitRow) (err error) {
mctx := libkb.NewMetaContext(ctx, g)
defer mctx.Trace(fmt.Sprintf("team.HandleExitNotification(%v)", len(rows)),
&err)()
g.NotifyRouter.HandleTeamMetadataUpdate(ctx)
for _, row := range rows {
mctx.Debug("team.HandleExitNotification: (%+v)", row)
if err := FreezeTeam(mctx, row.Id); err != nil {
mctx.Debug("team.HandleExitNotification: failed to FreezeTeam: %s", err)
}
invalidateCaches(mctx, row.Id)
mctx.G().NotifyRouter.HandleTeamExit(ctx, row.Id)
}
return nil
}
func HandleNewlyAddedToTeamNotification(ctx context.Context, g *libkb.GlobalContext, rows []keybase1.TeamNewlyAddedRow) (err error) {
mctx := libkb.NewMetaContext(ctx, g)
defer mctx.Trace(fmt.Sprintf("team.HandleNewlyAddedToTeamNotification(%v)", len(rows)),
&err)()
for _, row := range rows {
mctx.Debug("team.HandleNewlyAddedToTeamNotification: (%+v)", row)
mctx.G().NotifyRouter.HandleNewlyAddedToTeam(mctx.Ctx(), row.Id)
invalidateCaches(mctx, 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", &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), &err)()
return RetryIfPossible(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
inviteMD, found := team.chain().FindActiveInviteMDByID(untrustedInviteeFromGregor.InviteID)
if !found {
g.Log.CDebugf(ctx, "FindActiveInviteByID failed for invite %s", untrustedInviteeFromGregor.InviteID)
return libkb.NotFoundError{Msg: "Invite not found"}
}
invite := inviteMD.Invite
g.Log.CDebugf(ctx, "Found invite: %+v", invite)
category, err := invite.Type.C()
if err != nil {
return err
}
ityp, err := invite.Type.String()
if err != nil {
return err
}
switch category {
case keybase1.TeamInviteCategory_SBS:
// resolve assertion in link (with uid in invite msg)
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, keybase1.TeamInviteCategory_PHONE:
// 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)
// NOTE: AddMemberBySBS errors out when encountering PUK-less users,
// and this transaction is also set to default AllowPUKless=false.
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() {
// Do not send messages about keybase-type invites being resolved.
// They are supposed to be transparent for the users and look like
// a real members even though they have to be SBS-ed in.
if category != keybase1.TeamInviteCategory_KEYBASE {
iteamName, err := team.ImplicitTeamDisplayNameString(ctx)
if err != nil {
return err
}
g.Log.CDebugf(ctx,
"sending resolution message for successful SBS handle")
SendChatSBSResolutionMessage(ctx, g, iteamName,
string(invite.Name), ityp, verifiedInvitee.Uid)
}
} else {
g.Log.CDebugf(ctx, "sending welcome message for successful SBS handle")
SendChatInviteWelcomeMessage(ctx, g, team.Name().String(), category, invite.Inviter.Uid,
verifiedInvitee.Uid, invite.Role)
}
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", &err)()
return RetryIfPossible(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
switch joinAsRole {
case keybase1.TeamRole_READER, keybase1.TeamRole_WRITER:
default:
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, nil)
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
role keybase1.TeamRole
}
func HandleTeamSeitan(ctx context.Context, g *libkb.GlobalContext, msg keybase1.TeamSeitanMsg) (err error) {
ctx = libkb.WithLogTag(ctx, "SEIT")
mctx := libkb.NewMetaContext(ctx, g)
defer mctx.Trace("HandleTeamSeitan", &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
// we only reject invalid or used up invites after the transaction was
// correctly submitted.
var invitesToReject []keybase1.TeamSeitanRequest
// Only allow crypto-members added through 'team.change_membership' to be
// added for Seitan invites (AllowPUKless=false).
tx := CreateAddMemberTx(team)
for _, seitan := range msg.Seitans {
inviteMD, found := team.chain().FindActiveInviteMDByID(seitan.InviteID)
if !found {
mctx.Debug("Couldn't find specified invite id %q; skipping", seitan.InviteID)
continue
}
invite := inviteMD.Invite
mctx.Debug("Processing Seitan acceptance for invite %s", invite.Id)
err := verifySeitanSingle(ctx, g, team, invite, seitan)
if err != nil {
if _, ok := err.(InviteLinkAcceptanceError); ok {
mctx.Debug("Provided AKey failed to verify with error: %v; ignoring and scheduling for rejection", err)
invitesToReject = append(invitesToReject, seitan)
} else {
mctx.Debug("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 {
mctx.Debug("Failure in team.MemberRole: %v", err)
return err
}
err = tx.CanConsumeInvite(ctx, invite.Id)
if err != nil {
if _, ok := err.(InviteLinkAcceptanceError); ok {
mctx.Debug("Can't use invite: %s; ignoring and scheduling for rejection", err)
invitesToReject = append(invitesToReject, seitan)
} else {
mctx.Debug("Can't use invite: %s", err)
}
continue
}
isNewStyle, err := IsNewStyleInvite(invite)
if err != nil {
mctx.Debug("Error checking whether invite is new-style: %s", isNewStyle)
continue
}
if currentRole.IsOrAbove(invite.Role) {
mctx.Debug("User already has same or higher role.")
if !isNewStyle {
mctx.Debug("User already has same or higher role; since is not a new-style invite, cancelling invite.")
tx.CancelInvite(invite.Id, uv.Uid)
} else {
mctx.Debug("User already has same or higher role; scheduling for rejection.")
invitesToReject = append(invitesToReject, seitan)
}
continue
}
err = tx.AddMemberByUV(ctx, uv, invite.Role, nil)
if err != nil {
mctx.Debug("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.
err = tx.ConsumeInviteByID(ctx, invite.Id, uv)
if err != nil {
mctx.Debug("Failed to consume invite: %v", err)
continue
}
chats = append(chats, chatSeitanRecip{
inviter: invite.Inviter.Uid,
invitee: seitan.Uid,
role: invite.Role,
})
}
if tx.IsEmpty() {
mctx.Debug("Transaction is empty - nothing to post")
} else {
err = tx.Post(mctx)
if err != nil {
return fmt.Errorf("HandleTeamSeitan: Error posting transaction: %w", err)
}
// Send chats
for _, chat := range chats {
mctx.Debug("sending welcome message for successful Seitan handle: inviter: %s invitee: %s, role: %v",
chat.inviter, chat.invitee, chat.role)
SendChatInviteWelcomeMessage(ctx, g, team.Name().String(), keybase1.TeamInviteCategory_SEITAN,
chat.inviter, chat.invitee, chat.role)
}
}
if err = rejectInviteLinkAcceptances(mctx, invitesToReject); err != nil {
// the transaction posted correctly, and rejecting an invite is not a critical step, so just log and swallow the error
mctx.Debug("HandleTeamSeitan: error rejecting invite acceptances: %v", err)
}
return nil
}
func rejectInviteLinkAcceptances(mctx libkb.MetaContext, requests []keybase1.TeamSeitanRequest) error {
failed := 0
var lastErr error
for _, request := range requests {
arg := libkb.APIArg{
Endpoint: "team/reject_invite_acceptance",
SessionType: libkb.APISessionTypeREQUIRED,
Args: libkb.HTTPArgs{
"invite_id": libkb.S{Val: string(request.InviteID)},
"uid": libkb.S{Val: request.Uid.String()},
"eldest_seqno": libkb.I{Val: int(request.EldestSeqno)},
"akey": libkb.S{Val: string(request.Akey)},
},
}
if _, err := mctx.G().API.Post(mctx, arg); err != nil {
failed++
mctx.Debug("rejectInviteLinkAcceptances: failed to call cancel_invite_acceptance(%v,%v,%v): %s", request.InviteID, request.Uid, request.EldestSeqno, err)
lastErr = err
}
}
if failed > 0 {
return fmt.Errorf("Failed to reject %v (out of %v) InviteLink Acceptance requests. Last error: %w", failed, len(requests), lastErr)
}
return nil
}
func verifySeitanSingle(ctx context.Context, g *libkb.GlobalContext, team *Team, invite keybase1.TeamInvite, seitan keybase1.TeamSeitanRequest) (err error) {
pkey, err := SeitanDecodePKey(string(invite.Name))
if err != nil {
return err
}
keyAndLabel, err := pkey.DecryptKeyAndLabel(ctx, team)
if err != nil {
return err
}
labelversion, err := keyAndLabel.V()
if err != nil {
return fmt.Errorf("while parsing KeyAndLabel: %s", err)
}
category, err := invite.Type.C()
if err != nil {
return err
}
switch labelversion {
case keybase1.SeitanKeyAndLabelVersion_V1:
if category != keybase1.TeamInviteCategory_SEITAN {
return fmt.Errorf("HandleTeamSeitan wanted to claim an invite with category %v; wanted seitan", category)
}
return verifySeitanSingleV1(keyAndLabel.V1().I, invite, seitan)
case keybase1.SeitanKeyAndLabelVersion_V2:
if category != keybase1.TeamInviteCategory_SEITAN {
return fmt.Errorf("HandleTeamSeitan wanted to claim an invite with category %v; wanted seitan", category)
}
return verifySeitanSingleV2(keyAndLabel.V2().K, invite, seitan)
case keybase1.SeitanKeyAndLabelVersion_Invitelink:
if category != keybase1.TeamInviteCategory_INVITELINK {
return fmt.Errorf("HandleTeamSeitan wanted to claim an invite with category %v; wanted invitelink", category)
}
return verifySeitanSingleInvitelink(ctx, g, team, keyAndLabel.Invitelink().I, invite, seitan)
default:
return fmt.Errorf("unknown KeyAndLabel version: %v", labelversion)
}
}
func verifySeitanSingleV1(key keybase1.SeitanIKey, invite keybase1.TeamInvite, seitan keybase1.TeamSeitanRequest) (err error) {
// We repeat the steps that user does when they request access using the
// invite ID and see if we get the same answer for the same parameters (UV
// and unixCTime).
ikey := SeitanIKey(key)
uv := keybase1.UserVersion{
Uid: seitan.Uid,
EldestSeqno: seitan.EldestSeqno,
}
ourAccept, err := generateAcceptanceSeitanV1(ikey, uv, seitan.UnixCTime)
if err != nil {
return fmt.Errorf("failed to generate acceptance key to test: %w", err)
}
if !ourAccept.inviteID.Eq(invite.Id) {
return errors.New("invite ID mismatch (seitan)")
}
// Decode AKey received from the user to be able to do secure hash
// comparison.
decodedAKey, err := base64.StdEncoding.DecodeString(string(seitan.Akey))
if err != nil {
return err
}
if !libkb.SecureByteArrayEq(ourAccept.akey, decodedAKey) {
return fmt.Errorf("did not end up with the same AKey")
}
return nil
}
func verifySeitanSingleV2(key keybase1.SeitanPubKey, invite keybase1.TeamInvite, seitan keybase1.TeamSeitanRequest) (err error) {
// Do the public key signature verification. Signature coming from the user
// is encoded in seitan.Akey. Recreate message using UV and ctime, then
// verify signature.
pubKey, err := ImportSeitanPubKey(key)
if err != nil {
return err
}
// For V2 the server responds with sig in the akey field.
var sig SeitanSig
decodedSig, err := base64.StdEncoding.DecodeString(string(seitan.Akey))
if err != nil || len(sig) != len(decodedSig) {
return errors.New("Signature length verification failed (seitan)")
}
copy(sig[:], decodedSig)
// For V2 this is ms since the epoch, not seconds (like in V1 or InviteLink)
now := keybase1.Time(seitan.UnixCTime)
// 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 verifySeitanSingleInvitelink(ctx context.Context, g *libkb.GlobalContext, team *Team, ikey keybase1.SeitanIKeyInvitelink, invite keybase1.TeamInvite, seitan keybase1.TeamSeitanRequest) (err error) {
// We repeat the steps that user does when they request access using the
// invite ID and see if we get the same answer for the same parameters (UV
// and unixCTime).
//
// Also, we check that the state of the user in the team has not changed
// since they signed the acceptance.
uv := keybase1.UserVersion{
Uid: seitan.Uid,
EldestSeqno: seitan.EldestSeqno,
}
ourAccept, err := generateAcceptanceSeitanInviteLink(ikey, uv, seitan.UnixCTime)
if err != nil {
return NewInviteLinkAcceptanceError("failed to generate acceptance key to test: %w", err)
}
if !ourAccept.inviteID.Eq(invite.Id) {
return NewInviteLinkAcceptanceError("invite ID mismatch (seitan invitelink)")
}
// Decode AKey received from the user to be able to do secure hash
// comparison.
decodedAKey, err := base64.StdEncoding.DecodeString(string(seitan.Akey))
if err != nil {
return NewInviteLinkAcceptanceError("Unable to decode AKey: %s", err)
}
if !libkb.SecureByteArrayEq(ourAccept.akey, decodedAKey) {
return NewInviteLinkAcceptanceError("did not end up with the same invitelink AKey")
}
roleChangeTime, wasMember := team.UserLastRoleChangeTime(uv)
if wasMember && seitan.UnixCTime < roleChangeTime.UnixSeconds() {
return NewInviteLinkAcceptanceError("invite link was accepted before the user last changed their role")
}
if g.Clock().Now().Unix() < seitan.UnixCTime {
// In this case we do not return an InviteLinkAcceptanceError to avoid
// triggering a rejection in case this client's clock is off. If the
// server is honest, clients shouldn't get asked to process these invite
// links anyways, and if it is malicious than it does not matter if we
// ask it to reject. Moreover, not rejecting might be cause a slight
// performance degradation that can be detected server side, while
// rejecting erroneously means people can't get into the teams they want
// with no immediate feedback error.
return fmt.Errorf("acceptance was produced with a future timestamp: ignoring (without rejecting)")
}
return nil
}
func HandleForceRepollNotification(ctx context.Context, g *libkb.GlobalContext, dtime gregor.TimeOrOffset) error {
e1 := g.GetTeamLoader().ForceRepollUntil(ctx, dtime)
e2 := g.GetFastTeamLoader().ForceRepollUntil(libkb.NewMetaContext(ctx, g), dtime)
if e1 != nil {
return e1
}
return e2
}