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create.go
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create.go
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package teams
import (
"errors"
"golang.org/x/net/context"
"github.com/keybase/client/go/libkb"
"github.com/keybase/client/go/protocol/keybase1"
jsonw "github.com/keybase/go-jsonw"
)
func CreateRootTeam(ctx context.Context, g *libkb.GlobalContext, name string) (err error) {
defer g.CTrace(ctx, "CreateRootTeam", func() error { return err })()
g.Log.CDebugf(ctx, "CreateRootTeam load me")
me, err := libkb.LoadMe(libkb.NewLoadUserArg(g))
if err != nil {
return err
}
g.Log.CDebugf(ctx, "CreateRootTeam get device keys")
deviceSigningKey, err := g.ActiveDevice.SigningKey()
if err != nil {
return err
}
deviceEncryptionKey, err := g.ActiveDevice.EncryptionKey()
if err != nil {
return err
}
ownerLatest := me.GetComputedKeyFamily().GetLatestPerUserKey()
if ownerLatest == nil {
return errors.New("can't create a new team without having provisioned a per-user key")
}
secretboxRecipients := map[keybase1.UserVersion]keybase1.PerUserKey{
me.ToUserVersion(): *ownerLatest,
}
// These boxes will get posted along with the sig below.
m, err := NewTeamKeyManager(g)
if err != nil {
return err
}
secretboxes, err := m.SharedSecretBoxes(ctx, deviceEncryptionKey, secretboxRecipients)
if err != nil {
return err
}
perTeamSigningKey, err := m.SigningKey()
if err != nil {
return err
}
perTeamEncryptionKey, err := m.EncryptionKey()
if err != nil {
return err
}
g.Log.CDebugf(ctx, "CreateRootTeam make sigs")
teamSection, err := makeRootTeamSection(name, me, perTeamSigningKey.GetKID(), perTeamEncryptionKey.GetKID())
if err != nil {
return err
}
// At this point the team section has every field filled out except the
// reverse sig. Now we'll wrap it into a full sig, marshal it to JSON, and
// sign it, *twice*. The first time with the per-team signing key, to
// produce the reverse sig, and the second time with the device signing
// key, after the reverse sig has been written in.
sigBodyBeforeReverse, err := TeamRootSig(me, deviceSigningKey, teamSection)
if err != nil {
return err
}
// Note that this (sigchain-v1-style) reverse sig is made with the derived *per-team* signing key.
reverseSig, _, _, err := libkb.SignJSON(sigBodyBeforeReverse, perTeamSigningKey)
if err != nil {
return err
}
// Update the team section to include the reverse sig, sign it again, and
// make a sigchain-v2-style sig out of it. Doing it this way, instead of
// generating it twice with different parameters, makes it less likely to
// accidentally capture different global state (like ctime and merkle
// seqno).
sigBodyAfterReverse := sigBodyBeforeReverse
sigBodyAfterReverse.SetValueAtPath("body.team.per_team_key.reverse_sig", jsonw.NewString(reverseSig))
sigJSONAfterReverse, err := sigBodyAfterReverse.Marshal()
if err != nil {
return err
}
v2Sig, err := makeSigchainV2OuterSig(
deviceSigningKey,
libkb.LinkTypeTeamRoot,
1, /* seqno */
sigJSONAfterReverse,
nil, /* prevLinkID */
false, /* hasRevokes */
)
if err != nil {
return err
}
sigMultiItem := libkb.SigMultiItem{
Sig: v2Sig,
SigningKID: deviceSigningKey.GetKID(),
Type: string(libkb.LinkTypeTeamRoot),
SigInner: string(sigJSONAfterReverse),
TeamID: RootTeamIDFromNameString(name),
PublicKeys: &libkb.SigMultiItemPublicKeys{
Encryption: perTeamEncryptionKey.GetKID(),
Signing: perTeamSigningKey.GetKID(),
},
}
g.Log.CDebugf(ctx, "CreateRootTeam post sigs")
payload := make(libkb.JSONPayload)
payload["sigs"] = []interface{}{sigMultiItem}
payload["per_team_key"] = secretboxes
_, err = g.API.PostJSON(libkb.APIArg{
Endpoint: "sig/multi",
SessionType: libkb.APISessionTypeREQUIRED,
JSONPayload: payload,
})
return err
}
func CreateSubteam(ctx context.Context, g *libkb.GlobalContext, subteamBasename string, parentName keybase1.TeamName) (ret *keybase1.TeamID, err error) {
defer g.CTrace(ctx, "CreateSubteam", func() error { return err })()
subteamName, err := parentName.Append(subteamBasename)
if err != nil {
return nil, err
}
subteamID := NewSubteamID()
me, err := libkb.LoadMe(libkb.NewLoadUserArg(g))
if err != nil {
return nil, err
}
deviceSigningKey, err := g.ActiveDevice.SigningKey()
if err != nil {
return nil, err
}
parentTeam, err := GetForTeamManagementByStringName(ctx, g, parentName.String(), true)
if err != nil {
return nil, err
}
// Reuse the `me` getting loaded
parentTeam.me = me
admin, err := parentTeam.getAdminPermission(ctx, true)
if err != nil {
return nil, err
}
if err := parentTeam.ForceMerkleRootUpdate(ctx); err != nil {
return nil, err
}
// Subteam creation involves two links, one in the parent team's chain, and
// one to start the new subteam chain. The start of the new subteam chain
// (type "team.subteam_head") is very similar to the "team.root" sig that
// starts a root team, and so making that link is very similar to what the
// CreateTeamEngine does.
newSubteamSig, err := generateNewSubteamSigForParentChain(g, me, deviceSigningKey, parentTeam.chain(), subteamName, subteamID, admin)
if err != nil {
return nil, err
}
// subteam needs to be keyed for all admins above it
allParentAdmins, err := parentTeam.AllAdmins(ctx)
if err != nil {
return nil, err
}
subteamHeadSig, secretboxes, err := generateHeadSigForSubteamChain(ctx, g, me, deviceSigningKey, parentTeam.chain(), subteamName, subteamID, admin, allParentAdmins)
if err != nil {
return nil, err
}
payload := make(libkb.JSONPayload)
payload["sigs"] = []interface{}{newSubteamSig, subteamHeadSig}
payload["per_team_key"] = secretboxes
_, err = g.API.PostJSON(libkb.APIArg{
Endpoint: "sig/multi",
SessionType: libkb.APISessionTypeREQUIRED,
JSONPayload: payload,
})
if err != nil {
return nil, err
}
return &subteamID, nil
}
func makeRootTeamSection(teamName string, owner *libkb.User, perTeamSigningKID keybase1.KID, perTeamEncryptionKID keybase1.KID) (SCTeamSection, error) {
ownerUserVersion := owner.ToUserVersion()
teamID := RootTeamIDFromNameString(teamName)
teamSection := SCTeamSection{
Name: (*SCTeamName)(&teamName),
ID: (SCTeamID)(teamID),
PerTeamKey: &SCPerTeamKey{
Generation: 1,
SigKID: perTeamSigningKID,
EncKID: perTeamEncryptionKID,
},
Members: &SCTeamMembers{
Owners: &[]SCTeamMember{SCTeamMember(ownerUserVersion)},
Admins: &[]SCTeamMember{},
Writers: &[]SCTeamMember{},
Readers: &[]SCTeamMember{},
},
}
// At this point the team section has every field filled out except the
// reverse sig. Now we'll wrap it into a full sig, marshal it to JSON, and
// sign it, *twice*. The first time with the per-team signing key, to
// produce the reverse sig, and the second time with the device signing
// key, after the reverse sig has been written in.
return teamSection, nil
}
func makeSigchainV2OuterSig(
signingKey libkb.GenericKey,
v1LinkType libkb.LinkType,
seqno keybase1.Seqno,
innerLinkJSON []byte,
prevLinkID libkb.LinkID,
hasRevokes bool,
) (
string,
error,
) {
linkID := libkb.ComputeLinkID(innerLinkJSON)
v2LinkType, err := libkb.SigchainV2TypeFromV1TypeAndRevocations(string(v1LinkType), hasRevokes)
if err != nil {
return "", err
}
outerLink := libkb.OuterLinkV2{
Version: 2,
Seqno: seqno,
Prev: prevLinkID,
Curr: linkID,
LinkType: v2LinkType,
}
encodedOuterLink, err := outerLink.Encode()
if err != nil {
return "", err
}
sig, _, err := signingKey.SignToString(encodedOuterLink)
if err != nil {
return "", err
}
return sig, nil
}
func generateNewSubteamSigForParentChain(g *libkb.GlobalContext, me *libkb.User, signingKey libkb.GenericKey, parentTeam *TeamSigChainState, subteamName keybase1.TeamName, subteamID keybase1.TeamID, admin *SCTeamAdmin) (item *libkb.SigMultiItem, err error) {
newSubteamSigBody, err := NewSubteamSig(me, signingKey, parentTeam, subteamName, subteamID, admin)
if err != nil {
return nil, err
}
newSubteamSigJSON, err := newSubteamSigBody.Marshal()
if err != nil {
return nil, err
}
prevLinkID, err := libkb.ImportLinkID(parentTeam.GetLatestLinkID())
if err != nil {
return nil, err
}
v2Sig, err := makeSigchainV2OuterSig(
signingKey,
libkb.LinkTypeNewSubteam,
parentTeam.GetLatestSeqno()+1,
newSubteamSigJSON,
prevLinkID,
false, /* hasRevokes */
)
if err != nil {
return nil, err
}
item = &libkb.SigMultiItem{
Sig: v2Sig,
SigningKID: signingKey.GetKID(),
Type: string(libkb.LinkTypeNewSubteam),
SigInner: string(newSubteamSigJSON),
TeamID: parentTeam.GetID(),
}
return item, nil
}
func generateHeadSigForSubteamChain(ctx context.Context, g *libkb.GlobalContext, me *libkb.User, signingKey libkb.GenericKey, parentTeam *TeamSigChainState, subteamName keybase1.TeamName, subteamID keybase1.TeamID, admin *SCTeamAdmin, allParentAdmins []keybase1.UserVersion) (item *libkb.SigMultiItem, boxes *PerTeamSharedSecretBoxes, err error) {
deviceEncryptionKey, err := g.ActiveDevice.EncryptionKey()
if err != nil {
return
}
memSet := newMemberSet()
_, err = memSet.loadGroup(ctx, g, allParentAdmins, true /* store recipients */, true /* force poll */)
if err != nil {
return nil, nil, err
}
// These boxes will get posted along with the sig below.
m, err := NewTeamKeyManager(g)
if err != nil {
return nil, nil, err
}
boxes, err = m.SharedSecretBoxes(ctx, deviceEncryptionKey, memSet.recipients)
if err != nil {
return
}
perTeamSigningKey, err := m.SigningKey()
if err != nil {
return nil, nil, err
}
perTeamEncryptionKey, err := m.EncryptionKey()
if err != nil {
return nil, nil, err
}
// The "team" section of a subchain head link is similar to that of a
// "team.root" link, with the addition of the "parent" subsection.
teamSection, err := makeSubteamTeamSection(subteamName, subteamID, parentTeam, me, perTeamSigningKey.GetKID(), perTeamEncryptionKey.GetKID(), admin)
if err != nil {
return
}
subteamHeadSigBodyBeforeReverse, err := SubteamHeadSig(me, signingKey, teamSection)
if err != nil {
return
}
// Now generate the reverse sig and edit it into the JSON. Note that this
// (sigchain-v1-style) reverse sig is made with the derived *per-team*
// signing key.
reverseSig, _, _, err := libkb.SignJSON(subteamHeadSigBodyBeforeReverse, perTeamSigningKey)
if err != nil {
return
}
// Update the team section to include the reverse sig, sign it again, and
// make a sigchain-v2-style sig out of it. Doing it this way, instead of
// generating it twice with different parameters, makes it less likely to
// accidentally capture different global state (like ctime and merkle
// seqno).
subteamHeadSigBodyAfterReverse := subteamHeadSigBodyBeforeReverse
subteamHeadSigBodyAfterReverse.SetValueAtPath("body.team.per_team_key.reverse_sig", jsonw.NewString(reverseSig))
subteamHeadSigJSON, err := subteamHeadSigBodyAfterReverse.Marshal()
if err != nil {
return
}
v2Sig, err := makeSigchainV2OuterSig(
signingKey,
libkb.LinkTypeSubteamHead,
1, /* seqno */
subteamHeadSigJSON,
nil, /* prevLinkID */
false, /* hasRevokes */
)
if err != nil {
return
}
item = &libkb.SigMultiItem{
Sig: v2Sig,
SigningKID: signingKey.GetKID(),
Type: string(libkb.LinkTypeSubteamHead),
SigInner: string(subteamHeadSigJSON),
TeamID: subteamID,
PublicKeys: &libkb.SigMultiItemPublicKeys{
Encryption: perTeamEncryptionKey.GetKID(),
Signing: perTeamSigningKey.GetKID(),
},
}
return
}
func makeSubteamTeamSection(subteamName keybase1.TeamName, subteamID keybase1.TeamID, parentTeam *TeamSigChainState, owner *libkb.User, perTeamSigningKID keybase1.KID, perTeamEncryptionKID keybase1.KID, admin *SCTeamAdmin) (SCTeamSection, error) {
subteamName2 := subteamName.String()
teamSection := SCTeamSection{
Name: (*SCTeamName)(&subteamName2),
ID: (SCTeamID)(subteamID),
Parent: &SCTeamParent{
ID: SCTeamID(parentTeam.GetID()),
Seqno: parentTeam.GetLatestSeqno() + 1, // the seqno of the *new* parent link
SeqType: keybase1.SeqType_SEMIPRIVATE,
},
PerTeamKey: &SCPerTeamKey{
Generation: 1,
SigKID: perTeamSigningKID,
EncKID: perTeamEncryptionKID,
},
Members: &SCTeamMembers{
// Only root teams can have owners. Do not make the current user an admin by default.
Owners: &[]SCTeamMember{},
Admins: &[]SCTeamMember{},
Writers: &[]SCTeamMember{},
Readers: &[]SCTeamMember{},
},
Admin: admin,
}
// At this point the team section has every field filled out except the
// reverse sig. Next we'll wrap it into a full sig body, marshal it to
// JSON, and sign it, *twice*. The first time with the per-team signing
// key, to produce the reverse sig, and the second time with the device
// signing key, after the reverse sig has been written in.
return teamSection, nil
}