forked from keybase/client
/
chain_link.go
1102 lines (946 loc) · 30 KB
/
chain_link.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package libkb
import (
"crypto/sha256"
"encoding/hex"
"fmt"
"time"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
jsonw "github.com/keybase/go-jsonw"
)
const (
LinkIDLen = 32
)
type LinkID []byte
func GetLinkID(w *jsonw.Wrapper) (LinkID, error) {
if w.IsNil() {
return nil, nil
}
s, err := w.GetString()
if err != nil {
return nil, err
}
ret, err := LinkIDFromHex(s)
return ret, err
}
func ImportLinkID(i keybase1.LinkID) (LinkID, error) {
return LinkIDFromHex(string(i))
}
func GetLinkIDVoid(w *jsonw.Wrapper, l *LinkID, e *error) {
ret, err := GetLinkID(w)
if err != nil {
*e = err
} else {
*l = ret
}
}
func (l *LinkID) UnmarshalJSON(b []byte) error {
lid, err := LinkIDFromHex(keybase1.Unquote(b))
if err != nil {
return err
}
*l = make([]byte, len(lid))
copy((*l)[:], lid[:])
return nil
}
func (l *LinkID) MarshalJSON() ([]byte, error) {
return keybase1.Quote(l.String()), nil
}
func LinkIDFromHex(s string) (LinkID, error) {
bv, err := hex.DecodeString(s)
if err == nil && len(bv) != LinkIDLen {
err = fmt.Errorf("Bad link ID; wrong length: %d", len(bv))
bv = nil
}
var ret LinkID
if bv != nil {
ret = LinkID(bv)
}
return ret, err
}
func (l LinkID) String() string {
return hex.EncodeToString(l)
}
func (l LinkID) Eq(i2 LinkID) bool {
if l == nil && i2 == nil {
return true
} else if l == nil || i2 == nil {
return false
} else {
return FastByteArrayEq(l[:], i2[:])
}
}
type ChainLinkUnpacked struct {
prev LinkID
seqno keybase1.Seqno
payloadJSONStr string
ctime, etime int64
pgpFingerprint *PGPFingerprint
kid keybase1.KID
eldestKID keybase1.KID
sig string
sigID keybase1.SigID
uid keybase1.UID
username string
typ string
proofText string
outerLinkV2 *OuterLinkV2WithMetadata
sigVersion int
stubbed bool
firstAppearedMerkleSeqnoUnverified keybase1.Seqno
}
// A template for some of the reasons in badChainLinks below.
const badAkalin = "Link %d of akalin's sigchain, which was accidentally added by an old client in development on 23 Mar 2015 20:02 GMT."
const badJamGregory = "Link %d of jamgregory's sigchain, which had a bad PGP keypin"
const badDens = "Link 8 of dens's sigchain, which signs in a revoked PGP key"
// A map from SigIDs of bad chain links that should be ignored to the
// reasons why they're ignored.
var badChainLinks = map[keybase1.SigID]string{
// Links 22-25 of akalin's sigchain, which was accidentally
// added by an old client in development on 3/23/2015, 9:02am.
// Links 17-19 of jamGregory's sigchain, which referred to a corrupted
// PGP key. See https://github.com/keybase/client/issues/1908
// Link 8 of dens's sigchain is to a revoked PGP key, which wasn't
// properly checked for on the server side.
// See: https://github.com/keybase/client/issues/4754
"2a0da9730f049133ce728ba30de8c91b6658b7a375e82c4b3528d7ddb1a21f7a0f": fmt.Sprintf(badAkalin, 22),
"eb5c7e7d3cf8370bed8ab55c0d8833ce9d74fd2c614cf2cd2d4c30feca4518fa0f": fmt.Sprintf(badAkalin, 23),
"0f175ef0d3b57a9991db5deb30f2432a85bc05922bbe727016f3fb660863a1890f": fmt.Sprintf(badAkalin, 24),
"48267f0e3484b2f97859829503e20c2f598529b42c1d840a8fc1eceda71458400f": fmt.Sprintf(badAkalin, 25),
"1171fb8def065ecd8e053b042d7f162520de4b0bef853da7580e0668707770250f": fmt.Sprintf(badJamGregory, 17),
"e66998426a3bdba3b75aaec84d1fa75494061114abe9983da4e4495821a7ecf40f": fmt.Sprintf(badJamGregory, 18),
"bb92cc0c57bf99764b56ab54dbf489527c2744154706c07acd03007dcd7001480f": fmt.Sprintf(badJamGregory, 19),
"355e098e9e686dfa4758e25d56c7da58558fae2b281a2c8bcca9ed895f23767a0f": badDens,
}
// Some chainlinks are broken and need a small whitespace addition to match their payload
// hash in subsequent chainlinks. Caused by bad code on 15 Sep 2015.
const whitespaceIssue20150915 = "Bad whitespace stripping on 15 Sep 2015"
var badWhitespaceChainLinks = map[keybase1.SigID]string{
"595a73fc649c2c8ccc1aa79384e0b3e7ab3049d8df838f75ef0edbcb5bbc42990f": whitespaceIssue20150915,
"e256078702afd7a15a24681259935b48342a49840ab6a90291b300961669790f0f": whitespaceIssue20150915,
"30831001edee5e01c3b5f5850043f9ef7749a1ed8624dc703ae0922e1d0f16dd0f": whitespaceIssue20150915,
"88e6c581dbccbf390559bcb30ca21548ba0ec4861ec2d666217bd4ed4a4a8c3f0f": whitespaceIssue20150915,
"4db0fe3973b3a666c7830fcb39d93282f8bc414eca1d535033a5cc625eabda0c0f": whitespaceIssue20150915,
"9ba23a9a1796fb22b3c938f1edf5aba4ca5be7959d9151895eb6aa7a8d8ade420f": whitespaceIssue20150915,
"df0005f6c61bd6efd2867b320013800781f7f047e83fd44d484c2cb2616f019f0f": whitespaceIssue20150915,
"a32692af33e559e00a40aa3bb4004744d2c1083112468ed1c8040eaacd15c6eb0f": whitespaceIssue20150915,
"3e61901f50508aba72f12740fda2be488571afc51d718d845e339e5d1d1b531d0f": whitespaceIssue20150915,
"de43758b653b3383aca640a96c7890458eadd35242e8f8531f29b606890a14ea0f": whitespaceIssue20150915,
"b9ee3b46c97d48742a73e35494d3a373602460609e3c6c54a553fc4d83b659e40f": whitespaceIssue20150915,
"0ff29c1d036c3f4841f3f485e28d77351abb3eeeb52d2f8d802fd15e383d9a5f0f": whitespaceIssue20150915,
"eb1a13c6b6e42bb7470e222b51d36144a25ffc4fbc0b32e9a1ec11f059001bc80f": whitespaceIssue20150915,
"9c189d6d644bad9596f78519d870a685624f813afc1d0e49155073d3b0521f970f": whitespaceIssue20150915,
"aea7c8f7726871714e777ac730e77e1905a38e9587f9504b739ff9b77ef2d5cc0f": whitespaceIssue20150915,
"ac6e225b8324c1fcbe814382e198495bea801dfeb56cb22b9e89066cc52ab03b0f": whitespaceIssue20150915,
"3034e8b7d75861fc28a478b4992a8592b5478d4cbc7b87150d0b59573d731d870f": whitespaceIssue20150915,
"140f1b7b7ba32f34ad6302d0ed78692cf1564760d78c082965dc3b8b5f7e27f10f": whitespaceIssue20150915,
"833f27edcf54cc489795df1dc7d9f0cbea8253e1b84f5e82749a7a2a4ffc295c0f": whitespaceIssue20150915,
"110a64513b4188eca2af6406a8a6dbf278dfce324b8879b5cb67e8626ff2af180f": whitespaceIssue20150915,
"3042dbe45383b0c2eafe13a73da35c4e721be026d7908dfcef6eb121d95b75b10f": whitespaceIssue20150915,
"50ba350ddc388f7c6fdba032a7d283e4caa0ca656f92f69257213222dd7deeaf0f": whitespaceIssue20150915,
"803854b4074d668e1761ee9c533c0fc576bd0404cf26ff7545e14512f3b9002f0f": whitespaceIssue20150915,
"2e08f0b9566e15fa1f9e67b236e5385cdb38d57ff51d7ab3e568532867c9f8890f": whitespaceIssue20150915,
"cb97f4b62f2e817e8db8c6193440214ad20f906571e4851db186869f0b4c0e310f": whitespaceIssue20150915,
"a5c4a30d1eaaf752df424bf813c5a907a5cf94fd371e280d39e0a3d078310fba0f": whitespaceIssue20150915,
"c7d26afbc1957ecca890d8d9001a9cc4863490161720ad76a2aedeb8c2d50df70f": whitespaceIssue20150915,
"b385c0c76d790aba156ff68fd571171fc7cb85f75e7fc9d1561d7960d8875acb0f": whitespaceIssue20150915,
"47d349b8bb3c8457449390ca2ed5e489a70ad511ab3edb4c7f0af27eed8c65d30f": whitespaceIssue20150915,
"2785b24acd6869e1e7d38a91793af549f3c35cd0729127d200b66f8c0ffba59b0f": whitespaceIssue20150915,
"503df567f98cf5910ba44cb95e157e656afe95d159a15c7df4e88ac6016c948f0f": whitespaceIssue20150915,
"2892863758cdaf9796fb36e2466093762efda94e74eb51e3ab9d6bec54064b8a0f": whitespaceIssue20150915,
"e1d60584995e677254f7d913b3f40060b5500241d6de0c5822ba1282acc5e08b0f": whitespaceIssue20150915,
"031b506b705926ea962e59046bfe1720dcf72c85310502020e2ae836b294fcde0f": whitespaceIssue20150915,
"1454fec21489f17a6d78927af1c9dca4209360c6ef6bfa569d8b62d32e668ea30f": whitespaceIssue20150915,
"ba68052597a3782f64079d7d9ec821ea9785c0868e44b597a04c9cd8bf634c1e0f": whitespaceIssue20150915,
"db8d59151b2f78c82c095c9545f1e4d39947a0c0bcc01b907e0ace14517d39970f": whitespaceIssue20150915,
"e088beccfee26c5df39239023d1e4e0cbcd63fd50d0bdc4bf2c2ba25ef1a8fe40f": whitespaceIssue20150915,
"8182f385c347fe57d3c46fe40e8df0e2d6cabdac38f490417b313050249be9dc0f": whitespaceIssue20150915,
"2415e1c77b0815661452ea683e366c6d9dfd2008a7dbc907004c3a33e56cf6190f": whitespaceIssue20150915,
"44847743878bd56f5cd74980475e8f4e95d0d6ec1dd8722fd7cfc7761698ec780f": whitespaceIssue20150915,
"70c4026afec66312456b6820492b7936bff42b58ca7a035729462700677ef4190f": whitespaceIssue20150915,
"7591a920a5050de28faad24b5fe3336f658b964e0e64464b70878bfcf04537420f": whitespaceIssue20150915,
"10a45e10ff2585b03b9b5bc449cb1a7a44fbb7fcf25565286cb2d969ad9b89ae0f": whitespaceIssue20150915,
"062e6799f211177023bc310fd6e4e28a8e2e18f972d9b037d24434a203aca7240f": whitespaceIssue20150915,
"db9a0afaab297048be0d44ffd6d89a3eb6a003256426d7fd87a60ab59880f8160f": whitespaceIssue20150915,
"58bf751ddd23065a820449701f8a1a0a46019e1c54612ea0867086dbd405589a0f": whitespaceIssue20150915,
}
type ChainLink struct {
Contextified
parent *SigChain
id LinkID
hashVerified bool
sigVerified bool
payloadVerified bool
chainVerified bool
storedLocally bool
revoked bool
unsigned bool
dirty bool
packed *jsonw.Wrapper
payloadJSON *jsonw.Wrapper
unpacked *ChainLinkUnpacked
cki *ComputedKeyInfos
typed TypedChainLink
isOwnNewLinkFromServer bool
}
// Returns whether or not this chain link is bad, and if so, what the
// reason is.
func (c *ChainLink) IsBad() (isBad bool, reason string) {
reason, isBad = badChainLinks[c.GetSigID()]
return isBad, reason
}
func (c *ChainLink) Parent() *SigChain {
return c.parent
}
func (c *ChainLink) SetParent(parent *SigChain) {
if c.parent != nil {
c.G().Log.Warning("changing ChainLink parent")
}
c.parent = parent
}
func (c *ChainLink) getPrevFromPayload() LinkID {
return c.unpacked.prev
}
func (c *ChainLink) IsStubbed() bool {
return c.unpacked.stubbed
}
func (c *ChainLink) IsEldest() bool {
if c.unpacked == nil {
return false
}
if c.unpacked.outerLinkV2 != nil {
return c.unpacked.outerLinkV2.LinkType == SigchainV2TypeEldest
}
if c.unpacked.typ == string(DelegationTypeEldest) {
return true
}
return false
}
func (c *ChainLink) GetPrev() LinkID {
return c.unpacked.prev
}
func (c *ChainLink) GetCTime() time.Time {
if c.IsStubbed() {
return time.Time{}
}
return time.Unix(int64(c.unpacked.ctime), 0)
}
func (c *ChainLink) GetETime() time.Time {
if c.IsStubbed() {
return time.Time{}
}
return UnixToTimeMappingZero(c.unpacked.etime)
}
func (c *ChainLink) GetFirstAppearedMerkleSeqnoUnverified() keybase1.Seqno {
if c.IsStubbed() {
return keybase1.Seqno(0)
}
return c.unpacked.firstAppearedMerkleSeqnoUnverified
}
func (c *ChainLink) GetUID() keybase1.UID {
return c.unpacked.uid
}
func (c *ChainLink) GetPayloadJSON() *jsonw.Wrapper {
return c.payloadJSON
}
func (c *ChainLink) ToSigChainLocation() keybase1.SigChainLocation {
return keybase1.SigChainLocation{
Seqno: c.GetSeqno(),
SeqType: keybase1.SeqType_PUBLIC,
}
}
func (c *ChainLink) Pack() error {
p := jsonw.NewDictionary()
if c.IsStubbed() {
p.SetKey("s2", jsonw.NewString(c.unpacked.outerLinkV2.EncodeStubbed()))
} else {
// Store the original JSON string so its order is preserved
p.SetKey("payload_json", jsonw.NewString(c.unpacked.payloadJSONStr))
p.SetKey("sig", jsonw.NewString(c.unpacked.sig))
p.SetKey("sig_id", jsonw.NewString(string(c.unpacked.sigID)))
p.SetKey("kid", c.unpacked.kid.ToJsonw())
p.SetKey("ctime", jsonw.NewInt64(c.unpacked.ctime))
if c.unpacked.pgpFingerprint != nil {
p.SetKey("fingerprint", jsonw.NewString(c.unpacked.pgpFingerprint.String()))
}
p.SetKey("sig_verified", jsonw.NewBool(c.sigVerified))
p.SetKey("proof_text_full", jsonw.NewString(c.unpacked.proofText))
p.SetKey("sig_version", jsonw.NewInt(c.unpacked.sigVersion))
p.SetKey("merkle_seqno", jsonw.NewInt64(int64(c.unpacked.firstAppearedMerkleSeqnoUnverified)))
}
if c.cki != nil {
p.SetKey("computed_key_infos", jsonw.NewWrapper(*c.cki))
}
c.packed = p
return nil
}
func (c *ChainLink) GetMerkleSeqno() keybase1.Seqno {
if c.IsStubbed() {
return 0
}
i, err := c.payloadJSON.AtPath("body.merkle_root.seqno").GetInt()
if err != nil {
i = 0
}
return keybase1.Seqno(i)
}
func (c *ChainLink) GetMerkleHashMeta() (keybase1.HashMeta, error) {
if c.IsStubbed() {
return nil, nil
}
s, err := c.payloadJSON.AtPath("body.merkle_root.hash_meta").GetString()
if err != nil {
return nil, nil
}
ret, err := keybase1.HashMetaFromString(s)
if err != nil {
return nil, err
}
return ret, nil
}
func (c *ChainLink) GetRevocations() []keybase1.SigID {
if c.IsStubbed() {
return nil
}
var ret []keybase1.SigID
jw := c.payloadJSON.AtKey("body").AtKey("revoke")
s, err := GetSigID(jw.AtKey("sig_id"), true)
if err == nil {
ret = append(ret, s)
}
v := jw.AtKey("sig_ids")
var l int
l, err = v.Len()
if err == nil && l > 0 {
for i := 0; i < l; i++ {
if s, err = GetSigID(v.AtIndex(i), true); err == nil {
ret = append(ret, s)
}
}
}
return ret
}
func (c *ChainLink) GetRevokeKids() []keybase1.KID {
if c.IsStubbed() {
return nil
}
var ret []keybase1.KID
jw := c.payloadJSON.AtKey("body").AtKey("revoke")
if jw.IsNil() {
return nil
}
s, err := GetKID(jw.AtKey("kid"))
if err == nil {
ret = append(ret, s)
}
v := jw.AtKey("kids")
l, err := v.Len()
if err != nil {
return ret
}
for i := 0; i < l; i++ {
s, err = GetKID(v.AtIndex(i))
if err != nil {
continue
}
ret = append(ret, s)
}
return ret
}
func (c *ChainLink) checkAgainstMerkleTree(t *MerkleTriple) (found bool, err error) {
if c.IsStubbed() {
return false, ChainLinkError{"cannot check stubbed link against the merkle tree"}
}
found = false
if t != nil && c.GetSeqno() == t.Seqno {
c.G().Log.Debug("| Found chain tail advertised in Merkle tree @%d", int(t.Seqno))
found = true
if !c.id.Eq(t.LinkID) {
err = fmt.Errorf("Bad chain ID at seqno=%d", int(t.Seqno))
}
}
return
}
func (tmp *ChainLinkUnpacked) unpackPayloadJSON(payloadJSON *jsonw.Wrapper, payloadJSONStr string) (err error) {
var sq int64
var e2 error
if jw := payloadJSON.AtPath("body.key.fingerprint"); !jw.IsNil() {
if tmp.pgpFingerprint, e2 = GetPGPFingerprint(jw); e2 != nil {
err = e2
}
}
if jw := payloadJSON.AtPath("body.key.kid"); !jw.IsNil() {
if tmp.kid, e2 = GetKID(jw); e2 != nil {
err = e2
}
}
if jw := payloadJSON.AtPath("body.key.eldest_kid"); !jw.IsNil() {
if tmp.eldestKID, e2 = GetKID(jw); e2 != nil {
err = e2
}
}
payloadJSON.AtPath("body.key.username").GetStringVoid(&tmp.username, &err)
GetUIDVoid(payloadJSON.AtPath("body.key.uid"), &tmp.uid, &err)
GetLinkIDVoid(payloadJSON.AtKey("prev"), &tmp.prev, &err)
payloadJSON.AtPath("body.type").GetStringVoid(&tmp.typ, &err)
payloadJSON.AtKey("ctime").GetInt64Void(&tmp.ctime, &err)
payloadJSON.AtKey("seqno").GetInt64Void(&sq, &err)
var ei int64
payloadJSON.AtKey("expire_in").GetInt64Void(&ei, &err)
if err != nil {
return
}
tmp.seqno = keybase1.Seqno(sq)
tmp.etime = tmp.ctime + ei
tmp.payloadJSONStr = payloadJSONStr
return
}
func (c *ChainLink) UnpackLocal() (err error) {
tmp := ChainLinkUnpacked{}
err = tmp.unpackPayloadJSON(c.payloadJSON, "")
if err == nil {
c.unpacked = &tmp
}
return
}
func (c *ChainLink) UnpackComputedKeyInfos(jw *jsonw.Wrapper) (err error) {
var tmp ComputedKeyInfos
if jw == nil || jw.IsNil() {
return
}
if err = jw.UnmarshalAgain(&tmp); err == nil {
c.cki = &tmp
}
return
}
type chainLinkPacked struct {
SigID keybase1.SigID `json:"sig_id"`
Sig string `json:"sig"`
SigVersion int `json:"sigVersion"`
PayloadJSON string `json:"payload_json"`
ProofTextFull string `json:"proof_text_full"`
SigVerified bool `json:"sig_verified"`
}
func (c *ChainLink) unpackStubbed(raw string, err error) error {
if err != nil {
return err
}
var ol *OuterLinkV2WithMetadata
ol, err = DecodeStubbedOuterLinkV2(raw)
if err != nil {
return err
}
c.id = ol.LinkID()
c.unpacked = &ChainLinkUnpacked{
prev: ol.Prev,
seqno: ol.Seqno,
sigVersion: ol.Version,
outerLinkV2: ol,
stubbed: true,
}
return nil
}
func (c *ChainLink) Unpack(trusted bool, selfUID keybase1.UID) (err error) {
if jw := c.packed.AtKey("s2"); !jw.IsNil() {
return c.unpackStubbed(jw.GetString())
}
tmp := ChainLinkUnpacked{}
tmp.sigID, err = GetSigID(c.packed.AtKey("sig_id"), true)
c.packed.AtKey("sig").GetStringVoid(&tmp.sig, &err)
sigVersion := 1
if jw := c.packed.AtKey("sig_version"); !jw.IsNil() {
sigVersion, err = jw.GetInt()
if err != nil {
return err
}
}
tmp.sigVersion = sigVersion
if err != nil {
return err
}
if i, err := c.packed.AtKey("merkle_seqno").GetInt64(); err == nil {
tmp.firstAppearedMerkleSeqnoUnverified = keybase1.Seqno(i)
}
if jw := c.packed.AtKey("payload_json"); !jw.IsNil() {
payloadJSONStr, err := jw.GetString()
if err != nil {
return err
}
payloadJSON, err := jsonw.Unmarshal([]byte(payloadJSONStr))
if err != nil {
return err
}
if err := tmp.unpackPayloadJSON(payloadJSON, payloadJSONStr); err != nil {
return err
}
c.payloadJSON = payloadJSON
}
var sigKID, serverKID, payloadKID keybase1.KID
if tmp.sigVersion == 2 {
var ol2 *OuterLinkV2WithMetadata
ol2, err = DecodeOuterLinkV2(tmp.sig)
if err != nil {
return err
}
tmp.outerLinkV2 = ol2
sigKID = ol2.KID
}
payloadKID = tmp.kid
if jw := c.packed.AtKey("kid"); !jw.IsNil() {
serverKID, err = GetKID(jw)
if err != nil {
return err
}
}
if !payloadKID.IsNil() && !serverKID.IsNil() && !payloadKID.Equal(serverKID) {
return ChainLinkKIDMismatchError{
fmt.Sprintf("Payload KID (%s) doesn't match server KID (%s).",
payloadKID, serverKID),
}
}
if !payloadKID.IsNil() && !sigKID.IsNil() && !payloadKID.Equal(sigKID) {
return ChainLinkKIDMismatchError{
fmt.Sprintf("Payload KID (%s) doesn't match sig KID (%s).",
payloadKID, sigKID),
}
}
if !serverKID.IsNil() && !sigKID.IsNil() && !serverKID.Equal(sigKID) {
return ChainLinkKIDMismatchError{
fmt.Sprintf("Server KID (%s) doesn't match sig KID (%s).",
serverKID, sigKID),
}
}
if tmp.kid.IsNil() && !sigKID.IsNil() {
tmp.kid = sigKID
}
if tmp.kid.IsNil() && !serverKID.IsNil() {
tmp.kid = serverKID
}
// Note, we can still can in a situation in which don't know any kids!
// That would be bad *if* we need to verify the signature for this link.
// only unpack the proof_text_full if owner of this link
if tmp.uid.Equal(selfUID) {
ptf := c.packed.AtKey("proof_text_full")
if !ptf.IsNil() {
ptf.GetStringVoid(&tmp.proofText, &err)
}
}
c.unpacked = &tmp
// IF we're loaded from *trusted* storage, like our local
// DB, then we can skip verification later
if trusted {
b, e2 := c.packed.AtKey("sig_verified").GetBool()
if e2 == nil && b {
c.sigVerified = true
c.G().VDL.Log(VLog1, "| Link is marked as 'sig_verified'")
if e3 := c.UnpackComputedKeyInfos(c.packed.AtKey("computed_key_infos")); e3 != nil {
c.G().Log.Warning("Problem unpacking computed key infos: %s\n", e3)
}
}
}
c.G().VDL.Log(VLog1, "| Unpacked Link %s", c.id)
return err
}
func (c *ChainLink) CheckNameAndID(s NormalizedUsername, i keybase1.UID) error {
// We can't check name and ID if we have compacted chain link with no
// payload JSON
if c.IsStubbed() {
return nil
}
if c.unpacked.uid.NotEqual(i) {
return UIDMismatchError{
fmt.Sprintf("UID mismatch %s != %s in Link %s", c.unpacked.uid, i, c.id),
}
}
if !s.Eq(NewNormalizedUsername(c.unpacked.username)) {
return NewBadUsernameErrorWithFullMessage(
fmt.Sprintf("Username mismatch %s != %s in Link %s",
c.unpacked.username, s, c.id))
}
return nil
}
func ComputeLinkID(d []byte) LinkID {
h := sha256.Sum256(d)
return LinkID(h[:])
}
func (c *ChainLink) getPayloadHash() LinkID {
if c.unpacked == nil || c.unpacked.payloadJSONStr == "" {
return nil
}
h := sha256.Sum256([]byte(c.unpacked.payloadJSONStr))
return h[:]
}
func (c *ChainLink) verifyHashV2() error {
if c.hashVerified {
return nil
}
ol := c.unpacked.outerLinkV2
if ol == nil {
return fmt.Errorf("nil outer link V2 unpacking")
}
if h := ol.LinkID(); !FastByteArrayEq(h, c.id) {
return SigchainV2MismatchedHashError{}
}
c.hashVerified = true
c.G().LinkCache.Mutate(c.id, func(c *ChainLink) { c.hashVerified = true })
return nil
}
func (c *ChainLink) verifyHashV1() error {
if c.hashVerified {
return nil
}
h := c.getPayloadHash()
if !FastByteArrayEq(h[:], c.id) {
return fmt.Errorf("hash mismatch in verifyHashV1")
}
c.hashVerified = true
c.G().LinkCache.Mutate(c.id, func(c *ChainLink) { c.hashVerified = true })
return nil
}
// getFixedPayload usually just returns c.unpacked.payloadJSONstr, but sometimes
// it adds extra whitespace to work around server-side bugs.
func (c ChainLink) getFixedPayload() []byte {
ret := c.unpacked.payloadJSONStr
if s, ok := badWhitespaceChainLinks[c.unpacked.sigID]; ok {
c.G().Log.Debug("Fixing payload by adding newline on link '%s': %s", c.unpacked.sigID, s)
ret += "\n"
}
return []byte(ret)
}
func (c *ChainLink) getSigPayload() ([]byte, error) {
if c.IsStubbed() {
return nil, ChainLinkError{"Cannot verify sig with nil outer link v2"}
}
v := c.unpacked.sigVersion
switch v {
case 1:
return c.getFixedPayload(), nil
case 2:
return c.unpacked.outerLinkV2.raw, nil
default:
return nil, ChainLinkError{msg: fmt.Sprintf("unexpected signature version: %d", c.unpacked.sigVersion)}
}
}
func (c *ChainLink) verifyPayloadV2() error {
if c.payloadVerified {
return nil
}
ol := c.unpacked.outerLinkV2
if ol == nil {
return ChainLinkError{"no outer V2 structure available"}
}
version := 2
seqno := c.getSeqnoFromPayload()
prev := c.getPrevFromPayload()
curr := c.getPayloadHash()
linkType, err := c.GetSigchainV2Type()
if err != nil {
return err
}
if err := ol.AssertFields(version, seqno, prev, curr, linkType); err != nil {
return err
}
c.markPayloadVerified(ol.sigID)
return nil
}
func (c *ChainLink) markPayloadVerified(sigid keybase1.SigID) {
c.unpacked.sigID = sigid
c.payloadVerified = true
c.G().LinkCache.Mutate(c.id, func(c *ChainLink) { c.payloadVerified = true })
}
func (c *ChainLink) verifyPayloadV1() error {
if c.payloadVerified {
return nil
}
sigid, err := SigAssertPayload(c.unpacked.sig, c.getFixedPayload())
if err != nil {
return err
}
c.markPayloadVerified(sigid)
return nil
}
func (c *ChainLink) getSeqnoFromPayload() keybase1.Seqno {
if c.unpacked != nil {
return c.unpacked.seqno
}
return keybase1.Seqno(-1)
}
func (c *ChainLink) GetSeqno() keybase1.Seqno {
return c.unpacked.seqno
}
func (c *ChainLink) GetSigID() keybase1.SigID {
return c.unpacked.sigID
}
func (c *ChainLink) GetSigCheckCache() (cki *ComputedKeyInfos) {
if c.sigVerified && c.cki != nil {
cki = c.cki
}
return cki
}
func (c *ChainLink) PutSigCheckCache(cki *ComputedKeyInfos) {
c.G().Log.Debug("Caching SigCheck for link %s (version: %d)", c.id, cki.Version)
c.sigVerified = true
c.dirty = true
c.cki = cki
c.G().LinkCache.Mutate(c.id, func(c *ChainLink) { c.cki = cki })
return
}
func (c *ChainLink) VerifySigWithKeyFamily(ckf ComputedKeyFamily) (err error) {
var key GenericKey
var verifyKID keybase1.KID
var sigID keybase1.SigID
if c.IsStubbed() {
return ChainLinkError{"cannot verify signature -- none available; is this a stubbed out link?"}
}
verifyKID, err = c.checkServerSignatureMetadata(ckf)
if err != nil {
return err
}
if key, _, err = ckf.FindActiveSibkeyAtTime(verifyKID, c.GetCTime()); err != nil {
return err
}
if err = c.VerifyLink(); err != nil {
return err
}
var sigPayload []byte
sigPayload, err = c.getSigPayload()
if err != nil {
return err
}
if sigID, err = key.VerifyString(c.G().Log, c.unpacked.sig, sigPayload); err != nil {
return BadSigError{err.Error()}
}
c.unpacked.sigID = sigID
return nil
}
func ImportLinkFromServer(g *GlobalContext, parent *SigChain, jw *jsonw.Wrapper, selfUID keybase1.UID) (ret *ChainLink, err error) {
var id LinkID
if ph := jw.AtKey("payload_hash"); !ph.IsNil() {
id, err = GetLinkID(ph)
if err != nil {
return nil, err
}
}
ret = NewChainLink(g, parent, id, jw)
if err = ret.Unpack(false, selfUID); err != nil {
return nil, err
}
return ret, nil
}
func NewChainLink(g *GlobalContext, parent *SigChain, id LinkID, jw *jsonw.Wrapper) *ChainLink {
return &ChainLink{
Contextified: NewContextified(g),
parent: parent,
id: id,
packed: jw,
}
}
func ImportLinkFromStorage(id LinkID, selfUID keybase1.UID, g *GlobalContext) (*ChainLink, error) {
link, ok := g.LinkCache.Get(id)
if ok {
link.Contextified = NewContextified(g)
return &link, nil
}
jw, err := g.LocalDb.Get(DbKey{Typ: DBLink, Key: id.String()})
var ret *ChainLink
if err == nil && jw != nil {
// May as well recheck onload (maybe revisit this)
ret = NewChainLink(g, nil, id, jw)
if err = ret.Unpack(true, selfUID); err != nil {
return nil, err
}
ret.storedLocally = true
g.LinkCache.Put(id, ret.Copy())
}
return ret, err
}
func (c *ChainLink) VerifyLink() error {
v := c.unpacked.sigVersion
switch v {
case 1:
return c.verifyLinkV1()
case 2:
return c.verifyLinkV2()
default:
return ChainLinkError{msg: fmt.Sprintf("unexpected signature version: %d", v)}
}
}
func (c *ChainLink) verifyLinkV1() error {
if err := c.verifyHashV1(); err != nil {
return err
}
if err := c.verifyPayloadV1(); err != nil {
return err
}
return nil
}
func (c *ChainLink) verifyLinkV2() error {
if err := c.verifyHashV2(); err != nil {
return err
}
// We might not have an unpacked payload at all, if it's a V2 link
// without a body (for BW savings)
if c.IsStubbed() {
return nil
}
if err := c.verifyPayloadV2(); err != nil {
return err
}
return nil
}
func (c *ChainLink) HasRevocations() bool {
return len(c.GetRevocations())+len(c.GetRevokeKids()) > 0
}
func (c *ChainLink) GetSigchainV2Type() (SigchainV2Type, error) {
t, err := c.GetPayloadJSON().AtPath("body.type").GetString()
if err != nil {
return SigchainV2TypeNone, err
}
return SigchainV2TypeFromV1TypeAndRevocations(t, c.HasRevocations())
}
func (c *ChainLink) checkServerSignatureMetadata(ckf ComputedKeyFamily) (ret keybase1.KID, err error) {
var serverKID, linkKID, verifyKID keybase1.KID
if jw := c.packed.AtKey("kid"); !jw.IsNil() {
serverKID, err = GetKID(jw)
if err != nil {
return ret, err
}
}
linkKID = c.unpacked.kid
if linkKID.Exists() && serverKID.Exists() && linkKID.NotEqual(serverKID) {
// Check the KID. This is actually redundant of a check we do in Unpack(),
// but I'm keeping it here in case we change the way we unpack in the
// future. --jacko
return ret, ChainLinkKIDMismatchError{
fmt.Sprintf("Payload KID (%s) doesn't match server KID (%s).",
linkKID, serverKID),
}
}
if serverKID.Exists() {
verifyKID = serverKID
}
if linkKID.Exists() {
verifyKID = linkKID
}
if verifyKID.IsNil() {
return ret, ChainLinkError{"cannot verify signature without a KID"}
}
serverKey, err := ckf.FindKeyWithKIDUnsafe(verifyKID)
if err != nil {
return ret, err
}
// Check the fingerprint.
if c.unpacked.pgpFingerprint != nil {
payloadFingerprintStr := c.unpacked.pgpFingerprint.String()
serverFingerprintStr := ""
if fp := GetPGPFingerprintFromGenericKey(serverKey); fp != nil {
serverFingerprintStr = fp.String()
}
if payloadFingerprintStr != serverFingerprintStr {
return ret, ChainLinkFingerprintMismatchError{
fmt.Sprintf("Payload fingerprint (%s) did not match server key (%s).",
payloadFingerprintStr, serverFingerprintStr),
}
}
}
return verifyKID, nil
}
func (c *ChainLink) Store(g *GlobalContext) (didStore bool, err error) {
g.VDL.Log(VLog1, "| Storing Link %s...", c.id)
if c.storedLocally && !c.dirty {
g.VDL.Log(VLog1, "| Bailed on link %s since wasn't dirty...", c.id)
return didStore, nil
}
if err = c.VerifyLink(); err != nil {
return false, err
}
if !c.IsStubbed() && (!c.hashVerified || !c.payloadVerified) {
err = fmt.Errorf("Internal error; should have been verified in Store()")
return false, err
}