forked from keybase/client
/
sig.go
406 lines (352 loc) · 11.2 KB
/
sig.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
//
// Similar to libkb/kbsigs.go, but for teams sigs.
//
package teams
import (
"encoding/hex"
"errors"
"fmt"
"golang.org/x/net/context"
"github.com/davecgh/go-spew/spew"
"github.com/keybase/client/go/libkb"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
"github.com/keybase/client/go/sig3"
"github.com/keybase/client/go/teams/hidden"
jsonw "github.com/keybase/go-jsonw"
)
// metaContext returns a GlobalContext + a TODO context, since we're not
// threading through contexts through this library. In the future, we should
// fix this.
func metaContext(g *libkb.GlobalContext) libkb.MetaContext {
return libkb.NewMetaContextTODO(g)
}
func TeamRootSig(g *libkb.GlobalContext, me libkb.UserForSignatures, key libkb.GenericKey, teamSection SCTeamSection, merkleRoot libkb.MerkleRoot) (*jsonw.Wrapper, error) {
ret, err := libkb.ProofMetadata{
SigningUser: me,
Eldest: me.GetEldestKID(),
LinkType: libkb.LinkTypeTeamRoot,
SigningKey: key,
Seqno: 1,
SigVersion: libkb.KeybaseSignatureV2,
SeqType: seqTypeForTeamPublicness(teamSection.Public),
MerkleRoot: &merkleRoot,
}.ToJSON(metaContext(g))
if err != nil {
return nil, err
}
teamSectionJSON, err := jsonw.WrapperFromObject(teamSection)
if err != nil {
return nil, err
}
err = teamSectionJSON.SetValueAtPath("per_team_key.reverse_sig", jsonw.NewNil())
if err != nil {
return nil, err
}
body := ret.AtKey("body")
err = body.SetKey("team", teamSectionJSON)
if err != nil {
return nil, err
}
return ret, nil
}
func NewImplicitTeamName() (res keybase1.TeamName, err error) {
dat, err := libkb.RandBytes(keybase1.ImplicitSuffixLengthBytes)
if err != nil {
return res, err
}
res, err = keybase1.TeamNameFromString(fmt.Sprintf("%s%s", keybase1.ImplicitTeamPrefix, hex.EncodeToString(dat)))
return res, err
}
func NewSubteamSig(mctx libkb.MetaContext, me libkb.UserForSignatures, key libkb.GenericKey, parentTeam *TeamSigChainState, subteamName keybase1.TeamName, subteamID keybase1.TeamID, admin *SCTeamAdmin) (*jsonw.Wrapper, *hidden.Ratchet, error) {
g := mctx.G()
prevLinkID, err := libkb.ImportLinkID(parentTeam.GetLatestLinkID())
if err != nil {
return nil, nil, err
}
ret, err := libkb.ProofMetadata{
SigningUser: me,
Eldest: me.GetEldestKID(),
LinkType: libkb.LinkTypeNewSubteam,
SigningKey: key,
SigVersion: libkb.KeybaseSignatureV2,
SeqType: seqTypeForTeamPublicness(parentTeam.IsPublic()), // children are as public as their parent
Seqno: parentTeam.GetLatestSeqno() + 1,
PrevLinkID: prevLinkID,
}.ToJSON(metaContext(g))
if err != nil {
return nil, nil, err
}
entropy, err := makeSCTeamEntropy()
if err != nil {
return nil, nil, err
}
ratchet, err := parentTeam.makeHiddenRatchet(mctx)
if err != nil {
return nil, nil, err
}
teamSection := SCTeamSection{
ID: (SCTeamID)(parentTeam.GetID()),
Subteam: &SCSubteam{
ID: (SCTeamID)(subteamID),
Name: (SCTeamName)(subteamName.String()),
},
Admin: admin,
Entropy: entropy,
Ratchets: ratchet.ToTeamSection(),
}
teamSectionJSON, err := jsonw.WrapperFromObject(teamSection)
if err != nil {
return nil, nil, err
}
err = ret.SetValueAtPath("body.team", teamSectionJSON)
if err != nil {
return nil, nil, err
}
return ret, ratchet, nil
}
func SubteamHeadSig(g *libkb.GlobalContext, me libkb.UserForSignatures, key libkb.GenericKey, subteamTeamSection SCTeamSection, merkleRoot libkb.MerkleRoot) (*jsonw.Wrapper, error) {
ret, err := libkb.ProofMetadata{
SigningUser: me,
Eldest: me.GetEldestKID(),
LinkType: libkb.LinkTypeSubteamHead,
SigningKey: key,
Seqno: 1,
SigVersion: libkb.KeybaseSignatureV2,
SeqType: seqTypeForTeamPublicness(subteamTeamSection.Public),
MerkleRoot: &merkleRoot,
}.ToJSON(metaContext(g))
if err != nil {
return nil, err
}
// Note that the team section here is expected to have its Parent
// subsection filled out by the caller, unlike TeamRootSig.
teamSectionJSON, err := jsonw.WrapperFromObject(subteamTeamSection)
if err != nil {
return nil, err
}
err = teamSectionJSON.SetValueAtPath("per_team_key.reverse_sig", jsonw.NewNil())
if err != nil {
return nil, err
}
body := ret.AtKey("body")
err = body.SetKey("team", teamSectionJSON)
if err != nil {
return nil, err
}
return ret, nil
}
func RenameSubteamSig(g *libkb.GlobalContext, me libkb.UserForSignatures, key libkb.GenericKey, parentTeam *TeamSigChainState, teamSection SCTeamSection) (*jsonw.Wrapper, error) {
prev, err := parentTeam.GetLatestLibkbLinkID()
if err != nil {
return nil, err
}
ret, err := libkb.ProofMetadata{
SigningUser: me,
Eldest: me.GetEldestKID(),
LinkType: libkb.LinkTypeRenameSubteam,
SigningKey: key,
Seqno: parentTeam.GetLatestSeqno() + 1,
PrevLinkID: prev,
SigVersion: libkb.KeybaseSignatureV2,
SeqType: seqTypeForTeamPublicness(teamSection.Public),
}.ToJSON(metaContext(g))
if err != nil {
return nil, err
}
teamSectionJSON, err := jsonw.WrapperFromObject(teamSection)
if err != nil {
return nil, err
}
body := ret.AtKey("body")
err = body.SetKey("team", teamSectionJSON)
if err != nil {
return nil, err
}
return ret, nil
}
func RenameUpPointerSig(g *libkb.GlobalContext, me libkb.UserForSignatures, key libkb.GenericKey, subteam *TeamSigChainState, teamSection SCTeamSection) (*jsonw.Wrapper, error) {
prev, err := subteam.GetLatestLibkbLinkID()
if err != nil {
return nil, err
}
ret, err := libkb.ProofMetadata{
SigningUser: me,
Eldest: me.GetEldestKID(),
LinkType: libkb.LinkTypeRenameUpPointer,
SigningKey: key,
Seqno: subteam.GetLatestSeqno() + 1,
PrevLinkID: prev,
SigVersion: libkb.KeybaseSignatureV2,
SeqType: seqTypeForTeamPublicness(teamSection.Public),
}.ToJSON(metaContext(g))
if err != nil {
return nil, err
}
teamSectionJSON, err := jsonw.WrapperFromObject(teamSection)
if err != nil {
return nil, err
}
body := ret.AtKey("body")
err = body.SetKey("team", teamSectionJSON)
if err != nil {
return nil, err
}
return ret, nil
}
// 15 random bytes, followed by the byte 0x25, encoded as hex
func NewSubteamID(public bool) keybase1.TeamID {
var useSuffix byte = keybase1.SUB_TEAMID_PRIVATE_SUFFIX
if public {
useSuffix = keybase1.SUB_TEAMID_PUBLIC_SUFFIX
}
idBytes, err := libkb.RandBytesWithSuffix(16, useSuffix)
if err != nil {
panic("RandBytes failed: " + err.Error())
}
return keybase1.TeamID(hex.EncodeToString(idBytes))
}
func NewInviteID() SCTeamInviteID {
b, err := libkb.RandBytesWithSuffix(16, libkb.InviteIDTag)
if err != nil {
panic("RandBytes failed: " + err.Error())
}
return SCTeamInviteID(hex.EncodeToString(b))
}
func ChangeSig(g *libkb.GlobalContext, me libkb.UserForSignatures, prev libkb.LinkID, seqno keybase1.Seqno, key libkb.GenericKey, teamSection SCTeamSection,
linkType libkb.LinkType, merkleRoot *libkb.MerkleRoot) (*jsonw.Wrapper, error) {
if teamSection.PerTeamKey != nil {
if teamSection.PerTeamKey.ReverseSig != "" {
return nil, errors.New("ChangeMembershipSig called with PerTeamKey.ReverseSig already set")
}
}
ret, err := libkb.ProofMetadata{
LinkType: linkType,
SigningUser: me,
Eldest: me.GetEldestKID(),
SigningKey: key,
Seqno: seqno,
PrevLinkID: prev,
SigVersion: libkb.KeybaseSignatureV2,
SeqType: seqTypeForTeamPublicness(teamSection.Public),
MerkleRoot: merkleRoot,
}.ToJSON(metaContext(g))
if err != nil {
return nil, err
}
teamSectionJSON, err := jsonw.WrapperFromObject(teamSection)
if err != nil {
return nil, err
}
body := ret.AtKey("body")
err = body.SetKey("team", teamSectionJSON)
if err != nil {
return nil, err
}
return ret, nil
}
func makeSCTeamEntropy() (SCTeamEntropy, error) {
entropy, err := libkb.LinkEntropy()
if err != nil {
return SCTeamEntropy(""), err
}
return SCTeamEntropy(entropy), nil
}
func seqTypeForTeamPublicness(public bool) keybase1.SeqType {
if public {
return keybase1.SeqType_PUBLIC
}
return keybase1.SeqType_SEMIPRIVATE
}
func precheckLinkToPost(ctx context.Context, g *libkb.GlobalContext,
sigMultiItem libkb.SigMultiItem, state *TeamSigChainState,
me keybase1.UserVersion) (err error) {
return precheckLinksToPost(ctx, g, []libkb.SigMultiItem{sigMultiItem}, state, me)
}
func appendChainLinkSig3(ctx context.Context, g *libkb.GlobalContext,
sig libkb.Sig3, state *TeamSigChainState,
me keybase1.UserVersion) (err error) {
mctx := libkb.NewMetaContext(ctx, g)
if len(sig.Outer) == 0 || len(sig.Sig) == 0 {
return NewPrecheckStructuralError("got a stubbed v3 link on post, which isn't allowed", nil)
}
hp := hidden.NewLoaderPackageForPrecheck(mctx, state.GetID(), state.hidden)
ex := sig3.ExportJSON{
Inner: sig.Inner,
Outer: sig.Outer,
Sig: sig.Sig,
}
err = hp.Update(mctx, []sig3.ExportJSON{ex}, keybase1.Seqno(0))
if err != nil {
return err
}
mctx.Debug("appendChainLinkSig3 success for %s", sig.Outer)
return nil
}
func precheckLinksToPost(ctx context.Context, g *libkb.GlobalContext,
sigMultiItems []libkb.SigMultiItem, state *TeamSigChainState,
me keybase1.UserVersion) (err error) {
_, err = precheckLinksToState(ctx, g, sigMultiItems, state, me)
return err
}
func precheckLinksToState(ctx context.Context, g *libkb.GlobalContext,
sigMultiItems []libkb.SigMultiItem, state *TeamSigChainState,
me keybase1.UserVersion) (newState *TeamSigChainState, err error) {
defer g.CTrace(ctx, "precheckLinksToState", &err)()
isAdmin := true
if state != nil {
role, err := state.GetUserRole(me)
if err != nil {
role = keybase1.TeamRole_NONE
}
isAdmin = role.IsAdminOrAbove()
// As an optimization, AppendChainLink consumes its state.
// We don't consume our state parameter.
// So clone state before we pass it along to be consumed.
state = state.DeepCopyToPtr()
}
signer := SignerX{
signer: me,
implicitAdmin: !isAdmin,
}
for i, sigItem := range sigMultiItems {
if sigItem.Sig3 != nil {
err = appendChainLinkSig3(ctx, g, *sigItem.Sig3, state, me)
if err != nil {
g.Log.CDebugf(ctx, "precheckLinksToState: link (sig3) %v/%v rejected: %v", i+1, len(sigMultiItems), err)
return nil, NewPrecheckAppendError(err)
}
continue
}
outerLink, err := libkb.DecodeOuterLinkV2(sigItem.Sig)
if err != nil {
return nil, NewPrecheckStructuralError("unpack outer", err)
}
link1 := SCChainLink{
Seqno: outerLink.Seqno,
Sig: sigItem.Sig,
Payload: sigItem.SigInner,
UID: me.Uid,
Version: 2,
}
link2, err := unpackChainLink(&link1)
if err != nil {
return nil, NewPrecheckStructuralError("unpack link", err)
}
if link2.isStubbed() {
return nil, NewPrecheckStructuralError("link missing inner", nil)
}
newState, err := AppendChainLink(ctx, g, me, state, link2, &signer)
if err != nil {
if link2.inner != nil && link2.inner.Body.Team != nil && link2.inner.Body.Team.Members != nil {
g.Log.CDebugf(ctx, "precheckLinksToState: link %v/%v rejected: %v", i+1, len(sigMultiItems), spew.Sprintf("%v", *link2.inner.Body.Team.Members))
} else {
g.Log.CDebugf(ctx, "precheckLinksToState: link %v/%v rejected", i+1, len(sigMultiItems))
}
return nil, NewPrecheckAppendError(err)
}
state = &newState
}
return state, nil
}