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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| package signinwithssb | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "encoding/base64" | ||
| "fmt" | ||
|
|
||
| "golang.org/x/crypto/ed25519" | ||
|
|
||
| refs "go.mindeco.de/ssb-refs" | ||
| ) | ||
|
|
||
| // sign-in with ssb uses 256-bit nonces | ||
| const challengeLength = 32 | ||
|
|
||
| func DecodeChallengeString(c string) ([]byte, error) { | ||
| challangeBytes, err := base64.URLEncoding.DecodeString(c) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("invalid challenge encoding: %w", err) | ||
| } | ||
|
|
||
| if n := len(challangeBytes); n != challengeLength { | ||
| return nil, fmt.Errorf("invalid challenge length: expected %d but got %d", challengeLength, n) | ||
| } | ||
|
|
||
| return challangeBytes, nil | ||
| } | ||
|
|
||
| func GenerateChallenge() string { | ||
| buf := make([]byte, challengeLength) | ||
| rand.Read(buf) | ||
| return base64.URLEncoding.EncodeToString(buf) | ||
| } | ||
|
|
||
| // this structure is used to verify an incoming client response | ||
| type ClientRequest struct { | ||
| ClientID, ServerID refs.FeedRef | ||
|
|
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| ClientChallange string | ||
| ServerChallange string | ||
| } | ||
|
|
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| // recreate the signed message | ||
| func (cr ClientRequest) createMessage() []byte { | ||
| var msg bytes.Buffer | ||
| msg.WriteString("=http-auth-sign-in:") | ||
| msg.WriteString(cr.ServerID.Ref()) | ||
| msg.WriteString(":") | ||
| msg.WriteString(cr.ClientID.Ref()) | ||
| msg.WriteString(":") | ||
| msg.WriteString(cr.ServerChallange) | ||
| msg.WriteString(":") | ||
| msg.WriteString(cr.ClientChallange) | ||
| return msg.Bytes() | ||
| } | ||
|
|
||
| func (cr ClientRequest) Sign(privateKey ed25519.PrivateKey) []byte { | ||
| msg := cr.createMessage() | ||
| return ed25519.Sign(privateKey, msg) | ||
| } | ||
|
|
||
| func (cr ClientRequest) Validate(signature []byte) bool { | ||
| msg := cr.createMessage() | ||
| return ed25519.Verify(cr.ClientID.PubKey(), msg, signature) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| package signinwithssb | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| refs "go.mindeco.de/ssb-refs" | ||
| ) | ||
|
|
||
| func TestClientRequestString(t *testing.T) { | ||
|
|
||
| server := refs.FeedRef{ID: bytes.Repeat([]byte{1}, 32), Algo: "test"} | ||
|
|
||
| client := refs.FeedRef{ID: bytes.Repeat([]byte{2}, 32), Algo: "test"} | ||
|
|
||
| var req ClientRequest | ||
|
|
||
| req.ServerID = server | ||
| req.ClientID = client | ||
|
|
||
| req.ServerChallange = "fooo" | ||
| req.ClientChallange = "barr" | ||
|
|
||
| want := "=http-auth-sign-in:@AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE=.test:@AgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgI=.test:fooo:barr" | ||
|
|
||
| got := req.createMessage() | ||
| assert.Equal(t, want, string(got)) | ||
| } |
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