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policy.go
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policy.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package cauthdsl
import (
"errors"
"fmt"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/common/policies"
"github.com/hyperledger/fabric/msp"
cb "github.com/hyperledger/fabric/protos/common"
mspp "github.com/hyperledger/fabric/protos/msp"
)
type Identity interface {
// SatisfiesPrincipal checks whether this instance matches
// the description supplied in MSPPrincipal. The check may
// involve a byte-by-byte comparison (if the principal is
// a serialized identity) or may require MSP validation
SatisfiesPrincipal(principal *mspp.MSPPrincipal) error
// GetIdentifier returns the identifier of that identity
GetIdentifier() *msp.IdentityIdentifier
}
type IdentityAndSignature interface {
// Identity returns the identity associated to this instance
Identity() (Identity, error)
// Verify returns the validity status of this identity's signature over the message
Verify() error
}
type deserializeAndVerify struct {
signedData *cb.SignedData
deserializer msp.IdentityDeserializer
deserializedIdentity msp.Identity
}
func (d *deserializeAndVerify) Identity() (Identity, error) {
deserializedIdentity, err := d.deserializer.DeserializeIdentity(d.signedData.Identity)
if err != nil {
return nil, err
}
d.deserializedIdentity = deserializedIdentity
return deserializedIdentity, nil
}
func (d *deserializeAndVerify) Verify() error {
if d.deserializedIdentity == nil {
cauthdslLogger.Panicf("programming error, Identity must be called prior to Verify")
}
return d.deserializedIdentity.Verify(d.signedData.Data, d.signedData.Signature)
}
type provider struct {
deserializer msp.IdentityDeserializer
}
// NewProviderImpl provides a policy generator for cauthdsl type policies
func NewPolicyProvider(deserializer msp.IdentityDeserializer) policies.Provider {
return &provider{
deserializer: deserializer,
}
}
// NewPolicy creates a new policy based on the policy bytes
func (pr *provider) NewPolicy(data []byte) (policies.Policy, proto.Message, error) {
sigPolicy := &cb.SignaturePolicyEnvelope{}
if err := proto.Unmarshal(data, sigPolicy); err != nil {
return nil, nil, fmt.Errorf("Error unmarshaling to SignaturePolicy: %s", err)
}
if sigPolicy.Version != 0 {
return nil, nil, fmt.Errorf("This evaluator only understands messages of version 0, but version was %d", sigPolicy.Version)
}
compiled, err := compile(sigPolicy.Rule, sigPolicy.Identities, pr.deserializer)
if err != nil {
return nil, nil, err
}
return &policy{
evaluator: compiled,
deserializer: pr.deserializer,
}, sigPolicy, nil
}
type policy struct {
evaluator func([]IdentityAndSignature, []bool) bool
deserializer msp.IdentityDeserializer
}
// Evaluate takes a set of SignedData and evaluates whether this set of signatures satisfies the policy
func (p *policy) Evaluate(signatureSet []*cb.SignedData) error {
if p == nil {
return fmt.Errorf("No such policy")
}
idAndS := make([]IdentityAndSignature, len(signatureSet))
for i, sd := range signatureSet {
idAndS[i] = &deserializeAndVerify{
signedData: sd,
deserializer: p.deserializer,
}
}
ok := p.evaluator(deduplicate(idAndS), make([]bool, len(signatureSet)))
if !ok {
return errors.New("signature set did not satisfy policy")
}
return nil
}