github.com/leonlxy/hyperledger@v1.0.0-alpha.0.20170427033203-34922035d248/common/cauthdsl/cauthdsl.go (about) 1 /* 2 Copyright IBM Corp. 2016 All Rights Reserved. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package cauthdsl 18 19 import ( 20 "fmt" 21 22 "github.com/hyperledger/fabric/common/flogging" 23 "github.com/hyperledger/fabric/msp" 24 cb "github.com/hyperledger/fabric/protos/common" 25 mb "github.com/hyperledger/fabric/protos/msp" 26 ) 27 28 var cauthdslLogger = flogging.MustGetLogger("cauthdsl") 29 30 // compile recursively builds a go evaluatable function corresponding to the policy specified 31 func compile(policy *cb.SignaturePolicy, identities []*mb.MSPPrincipal, deserializer msp.IdentityDeserializer) (func([]*cb.SignedData, []bool) bool, error) { 32 switch t := policy.Type.(type) { 33 case *cb.SignaturePolicy_NOutOf_: 34 policies := make([]func([]*cb.SignedData, []bool) bool, len(t.NOutOf.Policies)) 35 for i, policy := range t.NOutOf.Policies { 36 compiledPolicy, err := compile(policy, identities, deserializer) 37 if err != nil { 38 return nil, err 39 } 40 policies[i] = compiledPolicy 41 42 } 43 return func(signedData []*cb.SignedData, used []bool) bool { 44 cauthdslLogger.Debugf("Gate evaluation starts: (%v)", t) 45 verified := int32(0) 46 _used := make([]bool, len(used)) 47 for _, policy := range policies { 48 copy(_used, used) 49 if policy(signedData, _used) { 50 verified++ 51 copy(used, _used) 52 } 53 } 54 55 if verified >= t.NOutOf.N { 56 cauthdslLogger.Debugf("Gate evaluation succeeds: (%v)", t) 57 } else { 58 cauthdslLogger.Debugf("Gate evaluation fails: (%v)", t) 59 } 60 61 return verified >= t.NOutOf.N 62 }, nil 63 case *cb.SignaturePolicy_SignedBy: 64 if t.SignedBy < 0 || t.SignedBy >= int32(len(identities)) { 65 return nil, fmt.Errorf("Identity index out of range, requested %v, but identies length is %d", t.SignedBy, len(identities)) 66 } 67 signedByID := identities[t.SignedBy] 68 return func(signedData []*cb.SignedData, used []bool) bool { 69 cauthdslLogger.Debugf("Principal evaluation starts: (%v) (used %v)", t, used) 70 for i, sd := range signedData { 71 if used[i] { 72 continue 73 } 74 identity, err := deserializer.DeserializeIdentity(sd.Identity) 75 if err != nil { 76 cauthdslLogger.Errorf("Principal deserialization failed: (%s) for identity %v", err, sd.Identity) 77 continue 78 } 79 err = identity.SatisfiesPrincipal(signedByID) 80 if err == nil { 81 cauthdslLogger.Debugf("Principal matched by identity: (%v) for %v", t, sd.Identity) 82 err = identity.Verify(sd.Data, sd.Signature) 83 if err == nil { 84 cauthdslLogger.Debugf("Principal evaluation succeeds: (%v) (used %v)", t, used) 85 used[i] = true 86 return true 87 } 88 } else { 89 cauthdslLogger.Debugf("Identity (%v) does not satisfy principal: %s", sd.Identity, err) 90 } 91 } 92 cauthdslLogger.Debugf("Principal evaluation fails: (%v) %v", t, used) 93 return false 94 }, nil 95 default: 96 return nil, fmt.Errorf("Unknown type: %T:%v", t, t) 97 } 98 }