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Add DPoP to access token request and introspection (#3033)
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| /* | ||
| * Copyright (C) 2024 Nuts community | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
|
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| package iam | ||
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| import ( | ||
| "fmt" | ||
| "github.com/nuts-foundation/go-did/did" | ||
| "github.com/nuts-foundation/nuts-node/auth/oauth" | ||
| "github.com/nuts-foundation/nuts-node/crypto" | ||
| "time" | ||
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| "github.com/nuts-foundation/nuts-node/crypto/dpop" | ||
| "github.com/nuts-foundation/nuts-node/vcr/pe" | ||
| ) | ||
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| type AccessToken struct { | ||
| // DPoP is the proof-of-possession of the key for the DID of the entity requesting the access token. | ||
| DPoP *dpop.DPoP `json:"dpop"` | ||
| // Token is the access token | ||
| Token string `json:"token"` | ||
| // Issuer and Subject of a token are always the same. | ||
| Issuer string `json:"issuer"` | ||
| // TODO: should client_id be extracted to the PDPMap using the presentation definition? | ||
| // ClientId is the DID of the entity requesting the access token. The Client needs to proof its id through proof-of-possession of the key for the DID. | ||
| ClientId string `json:"client_id"` | ||
| // IssuedAt is the time the token is issued | ||
| IssuedAt time.Time `json:"issued_at"` | ||
| // Expiration is the time the token expires | ||
| Expiration time.Time `json:"expiration"` | ||
| // Scope the token grants access to. Not necessarily the same as the requested scope | ||
| Scope string `json:"scope"` | ||
| // InputDescriptorConstraintIdMap maps the ID field of a PresentationDefinition input descriptor constraint to the value provided in the VPToken for the constraint. | ||
| // The Policy Decision Point can use this map to make decisions without having to deal with PEX/VCs/VPs/SignatureValidation | ||
| InputDescriptorConstraintIdMap map[string]any `json:"inputdescriptor_constraint_id_map,omitempty"` | ||
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| // additional fields to support unforeseen policy decision requirements | ||
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| // VPToken contains the VPs provided in the 'assertion' field of the s2s AT request. | ||
| VPToken []VerifiablePresentation `json:"vp_token,omitempty"` | ||
| // PresentationSubmissions as provided in by the wallet to fulfill the required Presentation Definition(s). | ||
| PresentationSubmissions map[string]pe.PresentationSubmission `json:"presentation_submissions,omitempty"` | ||
| // PresentationDefinitions that were required by the verifier to fulfill the request. | ||
| PresentationDefinitions pe.WalletOwnerMapping `json:"presentation_definitions,omitempty"` | ||
| } | ||
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| // createAccessToken is used in both the s2s and openid4vp flows | ||
| func (r Wrapper) createAccessToken(issuer did.DID, walletDID did.DID, issueTime time.Time, scope string, pexState PEXConsumer, dpopToken *dpop.DPoP) (*oauth.TokenResponse, error) { | ||
| credentialMap, err := pexState.credentialMap() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| fieldsMap, err := resolveInputDescriptorValues(pexState.RequiredPresentationDefinitions, credentialMap) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| accessToken := AccessToken{ | ||
| DPoP: dpopToken, | ||
| Token: crypto.GenerateNonce(), | ||
| Issuer: issuer.String(), | ||
| IssuedAt: issueTime, | ||
| ClientId: walletDID.String(), | ||
| Expiration: issueTime.Add(accessTokenValidity), | ||
| Scope: scope, | ||
| PresentationSubmissions: pexState.Submissions, | ||
| PresentationDefinitions: pexState.RequiredPresentationDefinitions, | ||
| InputDescriptorConstraintIdMap: fieldsMap, | ||
| } | ||
| for _, envelope := range pexState.SubmittedEnvelopes { | ||
| accessToken.VPToken = append(accessToken.VPToken, envelope.Presentations...) | ||
| } | ||
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| err = r.accessTokenServerStore().Put(accessToken.Token, accessToken) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to store access token: %w", err) | ||
| } | ||
| expiresIn := int(accessTokenValidity.Seconds()) | ||
| tokenType := AccessTokenTypeDPoP | ||
| if dpopToken == nil { | ||
| tokenType = AccessTokenTypeBearer | ||
| } | ||
| return &oauth.TokenResponse{ | ||
| AccessToken: accessToken.Token, | ||
| ExpiresIn: &expiresIn, | ||
| Scope: &scope, | ||
| TokenType: tokenType, | ||
| }, nil | ||
| } |
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