OpenID4VP ID1 + JWT VC Presentation Profile

[siacomuzzi]

Hi,

Do you have plans to support OpenID4VP ID1/JWT VC Presentation Profile spec?

• https://identity.foundation/jwt-vc-presentation-profile/
• https://openid.net/specs/openid-connect-4-verifiable-presentations-1_0-ID1.html

I know that there are a lot of specifications and different versions about that, but it seems like this specific one is used by Microsoft Entra.

Thank you

[nklomp]

Hi @siacomuzzi

Yes on both accounts. We are working on both of these. In https://github.com/Sphereon-Opensource/did-auth-siop/tree/release/v2.0.0 you can see some things landing for the VC Presentation Profile, like domain linkage etc.

The OID4VP work is just starting at this point, but we need something concrete to show interop over the next few weeks, so we will have something pretty fast.

[siacomuzzi]

Thank you @nklomp!

I just installed that branch in my webapp:

yarn add "github:Sphereon-Opensource/did-auth-siop#release/v2.0.0"

But it's looks like the build script is not executed:

Am I missing something?

[nklomp]

Yeah, unfortunately the name of the branch is a bit off. There is no release yet of that version. You could build it locally I guess. We will soon merge it.

[siacomuzzi]

I was able to build it locally:

did-auth-siop % yarn build
yarn run v1.22.10
$ run-p build:*
$ tsc -p tsconfig.build.json
$ node --loader ts-node/esm generator/schemaGenerator.ts
(node:40683) ExperimentalWarning: --experimental-loader is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
✨  Done in 10.63s.

But, after link the module into my webapp (yarn link "@sphereon/did-auth-siop") and execute it, I'm getting some runtime errors:

warn  - ../did-auth-siop/node_modules/node-fetch/lib/index.js
Module not found: Can't resolve 'encoding' in '/Users/xyz/Documents/did-auth-siop/node_modules/node-fetch/lib'

../did-auth-siop/node_modules/ws/lib/buffer-util.js
Module not found: Can't resolve 'bufferutil' in '/Users/xyz/Documents/did-auth-siop/node_modules/ws/lib'

../did-auth-siop/node_modules/ws/lib/validation.js
Module not found: Can't resolve 'utf-8-validate' in '/Users/xyz/Documents/did-auth-siop/node_modules/ws/lib'
error - Error: ENOENT: no such file or directory, open '(api)/../did-auth-siop/node_modules/jsonpath/include/module.js'
    at Object.openSync (node:fs:585:3)
    at Object.readFileSync (node:fs:453:35)
    at eval (webpack-internal:///(api)/../did-auth-siop/node_modules/jsonpath/lib/grammar.js:102:30)
    at Object.(api)/../did-auth-siop/node_modules/jsonpath/lib/grammar.js (/Users/xyz/Documents/vps-requester-tool-poc/.next/server/pages/api/vp_request.js:9526:1)
    at __webpack_require__ (/Users/xyz/Documents/vps-requester-tool-poc/.next/server/webpack-api-runtime.js:33:43)
    at eval (webpack-internal:///(api)/../did-auth-siop/node_modules/jsonpath/lib/parser.js:1:15)
    at Object.(api)/../did-auth-siop/node_modules/jsonpath/lib/parser.js (/Users/xyz/Documents/vps-requester-tool-poc/.next/server/pages/api/vp_request.js:9556:1)
    at __webpack_require__ (/Users/xyz/Documents/vps-requester-tool-poc/.next/server/webpack-api-runtime.js:33:43)
    at eval (webpack-internal:///(api)/../did-auth-siop/node_modules/jsonpath/lib/index.js:3:14)
    at Object.(api)/../did-auth-siop/node_modules/jsonpath/lib/index.js (/Users/xyz/Documents/vps-requester-tool-poc/.next/server/pages/api/vp_request.js:9546:1) {
  errno: -2,
  syscall: 'open',
  code: 'ENOENT',
  path: '(api)/../did-auth-siop/node_modules/jsonpath/include/module.js'
}
warn  - ../did-auth-siop/node_modules/node-fetch/lib/index.js
Module not found: Can't resolve 'encoding' in '/Users/xyz/Documents/did-auth-siop/node_modules/node-fetch/lib'

../did-auth-siop/node_modules/ws/lib/buffer-util.js
Module not found: Can't resolve 'bufferutil' in '/Users/xyz/Documents/did-auth-siop/node_modules/ws/lib'

../did-auth-siop/node_modules/ws/lib/validation.js
Module not found: Can't resolve 'utf-8-validate' in '/Users/xyz/Documents/did-auth-siop/node_modules/ws/lib'
wait  - compiling /_error (client and server)...
warn  - ../did-auth-siop/node_modules/node-fetch/lib/index.js
Module not found: Can't resolve 'encoding' in '/Users/xyz/Documents/did-auth-siop/node_modules/node-fetch/lib'

../did-auth-siop/node_modules/ws/lib/buffer-util.js
Module not found: Can't resolve 'bufferutil' in '/Users/xyz/Documents/did-auth-siop/node_modules/ws/lib'

../did-auth-siop/node_modules/ws/lib/validation.js
Module not found: Can't resolve 'utf-8-validate' in '/Users/xyz/Documents/did-auth-siop/node_modules/ws/lib'

[nklomp]

Hmzz, could you try out this version?
https://www.npmjs.com/package/@sphereon/did-auth-siop/v/0.2.14-unstable.2

I build it from the v2 branch just now.

If that yields the same results, could you provide you tsconfig and node/typescript versions?

[siacomuzzi]

@sphereon/did-auth-siop@0.2.14-unstable.2 isn't listed, should I use @sphereon/did-auth-siop@0.2.14-unstable.1 instead?

yarn add @sphereon/did-auth-siop@0.2.14-unstable.2
yarn add v1.22.10
[1/4] 🔍  Resolving packages...
Couldn't find any versions for "@sphereon/did-auth-siop" that matches "0.2.14-unstable.2"
? Please choose a version of "@sphereon/did-auth-siop" from this list: (Use arrow keys)
❯ 0.2.14-unstable.1
  0.2.13
  0.2.12
  0.2.12-next.4
  0.2.12-next.3
  0.2.12-next.2
  0.2.12-next.1
  0.2.12-UNSTABLE.0
  0.2.11
  0.2.11-UNSTABLE.0
  0.2.10
  0.2.9
  0.2.9-unstable.1
  0.2.9-unstable.0
  0.2.8
  0.2.7
  0.2.7-unstable.0
  0.2.6
  0.2.5
  0.2.4
  0.2.4-unstable.1
  0.2.3
  0.2.2
  0.2.1
  0.2.0
  0.1.1
  0.1.0
  0.0.1-temp-sp2
  0.0.1-temp-sp1

[siacomuzzi]

nvm, @sphereon/did-auth-siop@0.2.14-unstable.2 is listed now

[nklomp]

Hehe probably you were too fast. Sometimes it takes a bit. But indeed..1 also works. It only misses the last merge from today

[siacomuzzi]

It's working now, thank you for publishing it!
I've started playing with this library and Microsoft Entra and these are the first differences I've found so far:

1. pex library is enforcing that input_descriptors[x].schema.uri must be a valid uri, but accoriding to the spec, simple strings are valid too, like "schema": [ { "uri": "InteropExampleVC" } ]. See https://identity.foundation/jwt-vc-presentation-profile/#requesting-verifiable-credentials.
2. include client_name and client_purpose attributes as part of the registration. This info will be shown by wallet to holder during presentation flow.
3. Issuer is https://self-issued.me/v2/openid-vc (following the spec), but the library is expecting https://self-isued.me/v2 (we have the same problem with did-jwt)
4. Pass header object when resolving issuer did
5. sub_type claim isn't specified in the id_token, so library returns SIOPErrors.NO_SUB_TYPE
6. id_token has _vp_token claim, but library expects vp_token
7. It's not cleat to me how assertValidVerifiablePresentations takes presentation_submission object (located inside the id_token) to validate the vp_token. See https://identity.foundation/jwt-vc-presentation-profile/#structure-of-authentication-response

[nklomp]

Thanks for the valuable feedback. We will definitely address these. This lib predates the jwt-vc interop profile and was based on older SIOPv2 and OIDC4VP specs. Hence there are still some incompatibilities.

We certainly will make it compatible with the interop profile, since we need it ourselves as well ;)

CC @sksadjad @BtencateSphereon @maikel-maas

[nklomp]

Regarding 3. It seems like we are now in a situation, where the latest SIOPV2 spec, ditched the value altogether and the JWT VC Interop profile using a different value than the SIOPv2 Implementors Draft 1 version it was based on. I asked for clarification.

I asked for clarification in the interop profile Github: decentralized-identity/jwt-vc-presentation-profile#63

[nklomp]

Regarding 1. I think this is an error in the interop profile example. The schema comes from Presentation Exchange v1 specification and it quite clearly should be a URI. It also doesn't make much sense to me to have a simple string instead of a URI for what is supposed to link a schema. I have created a ticket in the interop github for clarification: decentralized-identity/jwt-vc-presentation-profile#64

[siacomuzzi]

Regarding 1. I think this is an error in the interop profile example. The schema comes from Presentation Exchange v1 specification and it quite clearly should be a URI. It also doesn't make much sense to me to have a simple string instead of a URI for what is supposed to link a schema. I have created a ticket in the interop github for clarification: decentralized-identity/jwt-vc-presentation-profile#64

Please note that the "format": "uri" attribute isn't specified in the Presentation Exchange v1 specification:

So something like { "uri": "InteropExampleVC" } should be valid.

[embesozzi]

Hi,
Is there any update on this ? Nowadays Microsoft Entra uses an string for the schema.uri, for example:

{
     id: "12bda93d-c33f-463d-9043-2bf7d4b715ab",
     input_descriptors: [
      {
           id: "VerifiedCredentialEmployee",
           name: "VerifiedCredentialEmployee",
           purpose: "So we can see that your Corporate Verified Employee",
           schema: [{
               "uri": "VerifiedCredentialEmployee"
           }],
           constraints: {
               fields: [
               {
                   ...
               ]
           },
       }]
}  

Is there a workaround for this? - BTW I'm using the latest version ^0.3.x of the library

Thanks,

[nklomp]

Hi @embesozzi. We are going to support strings as well, to ensure interop. We have this on our backlog together with some changes we need to make to the lower level Presentation Exchange at a later point.

But let me expedite this a bit, as it should be a simple change on our end.