diff --git a/scep/pkcs7/.gitignore b/scep/pkcs7/.gitignore new file mode 100644 index 00000000..daf913b1 --- /dev/null +++ b/scep/pkcs7/.gitignore @@ -0,0 +1,24 @@ +# Compiled Object files, Static and Dynamic libs (Shared Objects) +*.o +*.a +*.so + +# Folders +_obj +_test + +# Architecture specific extensions/prefixes +*.[568vq] +[568vq].out + +*.cgo1.go +*.cgo2.c +_cgo_defun.c +_cgo_gotypes.go +_cgo_export.* + +_testmain.go + +*.exe +*.test +*.prof diff --git a/scep/pkcs7/.travis.yml b/scep/pkcs7/.travis.yml new file mode 100644 index 00000000..eac4c176 --- /dev/null +++ b/scep/pkcs7/.travis.yml @@ -0,0 +1,10 @@ +language: go +go: + - "1.11" + - "1.12" + - "1.13" + - tip +before_install: + - make gettools +script: + - make diff --git a/scep/pkcs7/LICENSE b/scep/pkcs7/LICENSE new file mode 100644 index 00000000..75f32090 --- /dev/null +++ b/scep/pkcs7/LICENSE @@ -0,0 +1,22 @@ +The MIT License (MIT) + +Copyright (c) 2015 Andrew Smith + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + diff --git a/scep/pkcs7/Makefile b/scep/pkcs7/Makefile new file mode 100644 index 00000000..47c73b86 --- /dev/null +++ b/scep/pkcs7/Makefile @@ -0,0 +1,20 @@ +all: vet staticcheck test + +test: + go test -covermode=count -coverprofile=coverage.out . + +showcoverage: test + go tool cover -html=coverage.out + +vet: + go vet . + +lint: + golint . + +staticcheck: + staticcheck . + +gettools: + go get -u honnef.co/go/tools/... + go get -u golang.org/x/lint/golint diff --git a/scep/pkcs7/README.md b/scep/pkcs7/README.md new file mode 100644 index 00000000..bf37059c --- /dev/null +++ b/scep/pkcs7/README.md @@ -0,0 +1,69 @@ +# pkcs7 + +[![GoDoc](https://godoc.org/go.mozilla.org/pkcs7?status.svg)](https://godoc.org/go.mozilla.org/pkcs7) +[![Build Status](https://travis-ci.org/mozilla-services/pkcs7.svg?branch=master)](https://travis-ci.org/mozilla-services/pkcs7) + +pkcs7 implements parsing and creating signed and enveloped messages. + +```go +package main + +import ( + "bytes" + "crypto/rsa" + "crypto/x509" + "encoding/pem" + "fmt" + "os" + + "go.mozilla.org/pkcs7" +) + +func SignAndDetach(content []byte, cert *x509.Certificate, privkey *rsa.PrivateKey) (signed []byte, err error) { + toBeSigned, err := NewSignedData(content) + if err != nil { + err = fmt.Errorf("Cannot initialize signed data: %s", err) + return + } + if err = toBeSigned.AddSigner(cert, privkey, SignerInfoConfig{}); err != nil { + err = fmt.Errorf("Cannot add signer: %s", err) + return + } + + // Detach signature, omit if you want an embedded signature + toBeSigned.Detach() + + signed, err = toBeSigned.Finish() + if err != nil { + err = fmt.Errorf("Cannot finish signing data: %s", err) + return + } + + // Verify the signature + pem.Encode(os.Stdout, &pem.Block{Type: "PKCS7", Bytes: signed}) + p7, err := pkcs7.Parse(signed) + if err != nil { + err = fmt.Errorf("Cannot parse our signed data: %s", err) + return + } + + // since the signature was detached, reattach the content here + p7.Content = content + + if bytes.Compare(content, p7.Content) != 0 { + err = fmt.Errorf("Our content was not in the parsed data:\n\tExpected: %s\n\tActual: %s", content, p7.Content) + return + } + if err = p7.Verify(); err != nil { + err = fmt.Errorf("Cannot verify our signed data: %s", err) + return + } + + return signed, nil +} +``` + + + +## Credits +This is a fork of [fullsailor/pkcs7](https://github.com/fullsailor/pkcs7) diff --git a/scep/pkcs7/ber.go b/scep/pkcs7/ber.go new file mode 100644 index 00000000..58525673 --- /dev/null +++ b/scep/pkcs7/ber.go @@ -0,0 +1,251 @@ +package pkcs7 + +import ( + "bytes" + "errors" +) + +var encodeIndent = 0 + +type asn1Object interface { + EncodeTo(writer *bytes.Buffer) error +} + +type asn1Structured struct { + tagBytes []byte + content []asn1Object +} + +func (s asn1Structured) EncodeTo(out *bytes.Buffer) error { + //fmt.Printf("%s--> tag: % X\n", strings.Repeat("| ", encodeIndent), s.tagBytes) + encodeIndent++ + inner := new(bytes.Buffer) + for _, obj := range s.content { + err := obj.EncodeTo(inner) + if err != nil { + return err + } + } + encodeIndent-- + out.Write(s.tagBytes) + encodeLength(out, inner.Len()) + out.Write(inner.Bytes()) + return nil +} + +type asn1Primitive struct { + tagBytes []byte + length int + content []byte +} + +func (p asn1Primitive) EncodeTo(out *bytes.Buffer) error { + _, err := out.Write(p.tagBytes) + if err != nil { + return err + } + if err = encodeLength(out, p.length); err != nil { + return err + } + //fmt.Printf("%s--> tag: % X length: %d\n", strings.Repeat("| ", encodeIndent), p.tagBytes, p.length) + //fmt.Printf("%s--> content length: %d\n", strings.Repeat("| ", encodeIndent), len(p.content)) + out.Write(p.content) + + return nil +} + +func ber2der(ber []byte) ([]byte, error) { + if len(ber) == 0 { + return nil, errors.New("ber2der: input ber is empty") + } + //fmt.Printf("--> ber2der: Transcoding %d bytes\n", len(ber)) + out := new(bytes.Buffer) + + obj, _, err := readObject(ber, 0) + if err != nil { + return nil, err + } + obj.EncodeTo(out) + + // if offset < len(ber) { + // return nil, fmt.Errorf("ber2der: Content longer than expected. Got %d, expected %d", offset, len(ber)) + //} + + return out.Bytes(), nil +} + +// encodes lengths that are longer than 127 into string of bytes +func marshalLongLength(out *bytes.Buffer, i int) (err error) { + n := lengthLength(i) + + for ; n > 0; n-- { + err = out.WriteByte(byte(i >> uint((n-1)*8))) + if err != nil { + return + } + } + + return nil +} + +// computes the byte length of an encoded length value +func lengthLength(i int) (numBytes int) { + numBytes = 1 + for i > 255 { + numBytes++ + i >>= 8 + } + return +} + +// encodes the length in DER format +// If the length fits in 7 bits, the value is encoded directly. +// +// Otherwise, the number of bytes to encode the length is first determined. +// This number is likely to be 4 or less for a 32bit length. This number is +// added to 0x80. The length is encoded in big endian encoding follow after +// +// Examples: +// length | byte 1 | bytes n +// 0 | 0x00 | - +// 120 | 0x78 | - +// 200 | 0x81 | 0xC8 +// 500 | 0x82 | 0x01 0xF4 +// +func encodeLength(out *bytes.Buffer, length int) (err error) { + if length >= 128 { + l := lengthLength(length) + err = out.WriteByte(0x80 | byte(l)) + if err != nil { + return + } + err = marshalLongLength(out, length) + if err != nil { + return + } + } else { + err = out.WriteByte(byte(length)) + if err != nil { + return + } + } + return +} + +func readObject(ber []byte, offset int) (asn1Object, int, error) { + berLen := len(ber) + if offset >= berLen { + return nil, 0, errors.New("ber2der: offset is after end of ber data") + } + tagStart := offset + b := ber[offset] + offset++ + if offset >= berLen { + return nil, 0, errors.New("ber2der: cannot move offset forward, end of ber data reached") + } + tag := b & 0x1F // last 5 bits + if tag == 0x1F { + tag = 0 + for ber[offset] >= 0x80 { + tag = tag*128 + ber[offset] - 0x80 + offset++ + if offset > berLen { + return nil, 0, errors.New("ber2der: cannot move offset forward, end of ber data reached") + } + } + // jvehent 20170227: this doesn't appear to be used anywhere... + //tag = tag*128 + ber[offset] - 0x80 + offset++ + if offset > berLen { + return nil, 0, errors.New("ber2der: cannot move offset forward, end of ber data reached") + } + } + tagEnd := offset + + kind := b & 0x20 + if kind == 0 { + debugprint("--> Primitive\n") + } else { + debugprint("--> Constructed\n") + } + // read length + var length int + l := ber[offset] + offset++ + if offset > berLen { + return nil, 0, errors.New("ber2der: cannot move offset forward, end of ber data reached") + } + hack := 0 + if l > 0x80 { + numberOfBytes := (int)(l & 0x7F) + if numberOfBytes > 4 { // int is only guaranteed to be 32bit + return nil, 0, errors.New("ber2der: BER tag length too long") + } + if numberOfBytes == 4 && (int)(ber[offset]) > 0x7F { + return nil, 0, errors.New("ber2der: BER tag length is negative") + } + if (int)(ber[offset]) == 0x0 { + return nil, 0, errors.New("ber2der: BER tag length has leading zero") + } + debugprint("--> (compute length) indicator byte: %x\n", l) + debugprint("--> (compute length) length bytes: % X\n", ber[offset:offset+numberOfBytes]) + for i := 0; i < numberOfBytes; i++ { + length = length*256 + (int)(ber[offset]) + offset++ + if offset > berLen { + return nil, 0, errors.New("ber2der: cannot move offset forward, end of ber data reached") + } + } + } else if l == 0x80 { + // find length by searching content + markerIndex := bytes.LastIndex(ber[offset:], []byte{0x0, 0x0}) + if markerIndex == -1 { + return nil, 0, errors.New("ber2der: Invalid BER format") + } + length = markerIndex + hack = 2 + debugprint("--> (compute length) marker found at offset: %d\n", markerIndex+offset) + } else { + length = (int)(l) + } + if length < 0 { + return nil, 0, errors.New("ber2der: invalid negative value found in BER tag length") + } + //fmt.Printf("--> length : %d\n", length) + contentEnd := offset + length + if contentEnd > len(ber) { + return nil, 0, errors.New("ber2der: BER tag length is more than available data") + } + debugprint("--> content start : %d\n", offset) + debugprint("--> content end : %d\n", contentEnd) + debugprint("--> content : % X\n", ber[offset:contentEnd]) + var obj asn1Object + if kind == 0 { + obj = asn1Primitive{ + tagBytes: ber[tagStart:tagEnd], + length: length, + content: ber[offset:contentEnd], + } + } else { + var subObjects []asn1Object + for offset < contentEnd { + var subObj asn1Object + var err error + subObj, offset, err = readObject(ber[:contentEnd], offset) + if err != nil { + return nil, 0, err + } + subObjects = append(subObjects, subObj) + } + obj = asn1Structured{ + tagBytes: ber[tagStart:tagEnd], + content: subObjects, + } + } + + return obj, contentEnd + hack, nil +} + +func debugprint(format string, a ...interface{}) { + //fmt.Printf(format, a) +} diff --git a/scep/pkcs7/ber_test.go b/scep/pkcs7/ber_test.go new file mode 100644 index 00000000..fcb4b6a2 --- /dev/null +++ b/scep/pkcs7/ber_test.go @@ -0,0 +1,62 @@ +package pkcs7 + +import ( + "bytes" + "encoding/asn1" + "strings" + "testing" +) + +func TestBer2Der(t *testing.T) { + // indefinite length fixture + ber := []byte{0x30, 0x80, 0x02, 0x01, 0x01, 0x00, 0x00} + expected := []byte{0x30, 0x03, 0x02, 0x01, 0x01} + der, err := ber2der(ber) + if err != nil { + t.Fatalf("ber2der failed with error: %v", err) + } + if !bytes.Equal(der, expected) { + t.Errorf("ber2der result did not match.\n\tExpected: % X\n\tActual: % X", expected, der) + } + + if der2, err := ber2der(der); err != nil { + t.Errorf("ber2der on DER bytes failed with error: %v", err) + } else { + if !bytes.Equal(der, der2) { + t.Error("ber2der is not idempotent") + } + } + var thing struct { + Number int + } + rest, err := asn1.Unmarshal(der, &thing) + if err != nil { + t.Errorf("Cannot parse resulting DER because: %v", err) + } else if len(rest) > 0 { + t.Errorf("Resulting DER has trailing data: % X", rest) + } +} + +func TestBer2Der_Negatives(t *testing.T) { + fixtures := []struct { + Input []byte + ErrorContains string + }{ + {[]byte{0x30, 0x85}, "tag length too long"}, + {[]byte{0x30, 0x84, 0x80, 0x0, 0x0, 0x0}, "length is negative"}, + {[]byte{0x30, 0x82, 0x0, 0x1}, "length has leading zero"}, + {[]byte{0x30, 0x80, 0x1, 0x2}, "Invalid BER format"}, + {[]byte{0x30, 0x03, 0x01, 0x02}, "length is more than available data"}, + {[]byte{0x30}, "end of ber data reached"}, + } + + for _, fixture := range fixtures { + _, err := ber2der(fixture.Input) + if err == nil { + t.Errorf("No error thrown. Expected: %s", fixture.ErrorContains) + } + if !strings.Contains(err.Error(), fixture.ErrorContains) { + t.Errorf("Unexpected error thrown.\n\tExpected: /%s/\n\tActual: %s", fixture.ErrorContains, err.Error()) + } + } +} diff --git a/scep/pkcs7/decrypt.go b/scep/pkcs7/decrypt.go new file mode 100644 index 00000000..0d088d62 --- /dev/null +++ b/scep/pkcs7/decrypt.go @@ -0,0 +1,177 @@ +package pkcs7 + +import ( + "bytes" + "crypto" + "crypto/aes" + "crypto/cipher" + "crypto/des" + "crypto/rand" + "crypto/rsa" + "crypto/x509" + "encoding/asn1" + "errors" + "fmt" +) + +// ErrUnsupportedAlgorithm tells you when our quick dev assumptions have failed +var ErrUnsupportedAlgorithm = errors.New("pkcs7: cannot decrypt data: only RSA, DES, DES-EDE3, AES-256-CBC and AES-128-GCM supported") + +// ErrNotEncryptedContent is returned when attempting to Decrypt data that is not encrypted data +var ErrNotEncryptedContent = errors.New("pkcs7: content data is a decryptable data type") + +// Decrypt decrypts encrypted content info for recipient cert and private key +func (p7 *PKCS7) Decrypt(cert *x509.Certificate, pkey crypto.PrivateKey) ([]byte, error) { + data, ok := p7.raw.(envelopedData) + if !ok { + return nil, ErrNotEncryptedContent + } + recipient := selectRecipientForCertificate(data.RecipientInfos, cert) + if recipient.EncryptedKey == nil { + return nil, errors.New("pkcs7: no enveloped recipient for provided certificate") + } + switch pkey := pkey.(type) { + case *rsa.PrivateKey: + var contentKey []byte + contentKey, err := rsa.DecryptPKCS1v15(rand.Reader, pkey, recipient.EncryptedKey) + if err != nil { + return nil, err + } + return data.EncryptedContentInfo.decrypt(contentKey) + } + return nil, ErrUnsupportedAlgorithm +} + +// DecryptUsingPSK decrypts encrypted data using caller provided +// pre-shared secret +func (p7 *PKCS7) DecryptUsingPSK(key []byte) ([]byte, error) { + data, ok := p7.raw.(encryptedData) + if !ok { + return nil, ErrNotEncryptedContent + } + return data.EncryptedContentInfo.decrypt(key) +} + +func (eci encryptedContentInfo) decrypt(key []byte) ([]byte, error) { + alg := eci.ContentEncryptionAlgorithm.Algorithm + if !alg.Equal(OIDEncryptionAlgorithmDESCBC) && + !alg.Equal(OIDEncryptionAlgorithmDESEDE3CBC) && + !alg.Equal(OIDEncryptionAlgorithmAES256CBC) && + !alg.Equal(OIDEncryptionAlgorithmAES128CBC) && + !alg.Equal(OIDEncryptionAlgorithmAES128GCM) && + !alg.Equal(OIDEncryptionAlgorithmAES256GCM) { + fmt.Printf("Unsupported Content Encryption Algorithm: %s\n", alg) + return nil, ErrUnsupportedAlgorithm + } + + // EncryptedContent can either be constructed of multple OCTET STRINGs + // or _be_ a tagged OCTET STRING + var cyphertext []byte + if eci.EncryptedContent.IsCompound { + // Complex case to concat all of the children OCTET STRINGs + var buf bytes.Buffer + cypherbytes := eci.EncryptedContent.Bytes + for { + var part []byte + cypherbytes, _ = asn1.Unmarshal(cypherbytes, &part) + buf.Write(part) + if cypherbytes == nil { + break + } + } + cyphertext = buf.Bytes() + } else { + // Simple case, the bytes _are_ the cyphertext + cyphertext = eci.EncryptedContent.Bytes + } + + var block cipher.Block + var err error + + switch { + case alg.Equal(OIDEncryptionAlgorithmDESCBC): + block, err = des.NewCipher(key) + case alg.Equal(OIDEncryptionAlgorithmDESEDE3CBC): + block, err = des.NewTripleDESCipher(key) + case alg.Equal(OIDEncryptionAlgorithmAES256CBC), alg.Equal(OIDEncryptionAlgorithmAES256GCM): + fallthrough + case alg.Equal(OIDEncryptionAlgorithmAES128GCM), alg.Equal(OIDEncryptionAlgorithmAES128CBC): + block, err = aes.NewCipher(key) + } + + if err != nil { + return nil, err + } + + if alg.Equal(OIDEncryptionAlgorithmAES128GCM) || alg.Equal(OIDEncryptionAlgorithmAES256GCM) { + params := aesGCMParameters{} + paramBytes := eci.ContentEncryptionAlgorithm.Parameters.Bytes + + _, err := asn1.Unmarshal(paramBytes, ¶ms) + if err != nil { + return nil, err + } + + gcm, err := cipher.NewGCM(block) + if err != nil { + return nil, err + } + + if len(params.Nonce) != gcm.NonceSize() { + return nil, errors.New("pkcs7: encryption algorithm parameters are incorrect") + } + if params.ICVLen != gcm.Overhead() { + return nil, errors.New("pkcs7: encryption algorithm parameters are incorrect") + } + + plaintext, err := gcm.Open(nil, params.Nonce, cyphertext, nil) + if err != nil { + return nil, err + } + + return plaintext, nil + } + + iv := eci.ContentEncryptionAlgorithm.Parameters.Bytes + if len(iv) != block.BlockSize() { + return nil, errors.New("pkcs7: encryption algorithm parameters are malformed") + } + mode := cipher.NewCBCDecrypter(block, iv) + plaintext := make([]byte, len(cyphertext)) + mode.CryptBlocks(plaintext, cyphertext) + if plaintext, err = unpad(plaintext, mode.BlockSize()); err != nil { + return nil, err + } + return plaintext, nil +} + +func unpad(data []byte, blocklen int) ([]byte, error) { + if blocklen < 1 { + return nil, fmt.Errorf("invalid blocklen %d", blocklen) + } + if len(data)%blocklen != 0 || len(data) == 0 { + return nil, fmt.Errorf("invalid data len %d", len(data)) + } + + // the last byte is the length of padding + padlen := int(data[len(data)-1]) + + // check padding integrity, all bytes should be the same + pad := data[len(data)-padlen:] + for _, padbyte := range pad { + if padbyte != byte(padlen) { + return nil, errors.New("invalid padding") + } + } + + return data[:len(data)-padlen], nil +} + +func selectRecipientForCertificate(recipients []recipientInfo, cert *x509.Certificate) recipientInfo { + for _, recp := range recipients { + if isCertMatchForIssuerAndSerial(cert, recp.IssuerAndSerialNumber) { + return recp + } + } + return recipientInfo{} +} diff --git a/scep/pkcs7/decrypt_test.go b/scep/pkcs7/decrypt_test.go new file mode 100644 index 00000000..06cc0f80 --- /dev/null +++ b/scep/pkcs7/decrypt_test.go @@ -0,0 +1,60 @@ +package pkcs7 + +import ( + "bytes" + "testing" +) + +func TestDecrypt(t *testing.T) { + fixture := UnmarshalTestFixture(EncryptedTestFixture) + p7, err := Parse(fixture.Input) + if err != nil { + t.Fatal(err) + } + content, err := p7.Decrypt(fixture.Certificate, fixture.PrivateKey) + if err != nil { + t.Errorf("Cannot Decrypt with error: %v", err) + } + expected := []byte("This is a test") + if !bytes.Equal(content, expected) { + t.Errorf("Decrypted result does not match.\n\tExpected:%s\n\tActual:%s", expected, content) + } +} + +// Content is "This is a test" +var EncryptedTestFixture = ` +-----BEGIN PKCS7----- +MIIBFwYJKoZIhvcNAQcDoIIBCDCCAQQCAQAxgcowgccCAQAwMjApMRAwDgYDVQQK +EwdBY21lIENvMRUwEwYDVQQDEwxFZGRhcmQgU3RhcmsCBQDL+CvWMAsGCSqGSIb3 +DQEBAQSBgKyP/5WlRTZD3dWMrLOX6QRNDrXEkQjhmToRwFZdY3LgUh25ZU0S/q4G +dHPV21Fv9lQD+q7l3vfeHw8M6Z1PKi9sHMVfxAkQpvaI96DTIT3YHtuLC1w3geCO +8eFWTq2qS4WChSuS/yhYosjA1kTkE0eLnVZcGw0z/WVuEZznkdyIMDIGCSqGSIb3 +DQEHATARBgUrDgMCBwQImpKsUyMPpQigEgQQRcWWrCRXqpD5Njs0GkJl+g== +-----END PKCS7----- +-----BEGIN CERTIFICATE----- +MIIB1jCCAUGgAwIBAgIFAMv4K9YwCwYJKoZIhvcNAQELMCkxEDAOBgNVBAoTB0Fj +bWUgQ28xFTATBgNVBAMTDEVkZGFyZCBTdGFyazAeFw0xNTA1MDYwMzU2NDBaFw0x +NjA1MDYwMzU2NDBaMCUxEDAOBgNVBAoTB0FjbWUgQ28xETAPBgNVBAMTCEpvbiBT +bm93MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDK6NU0R0eiCYVquU4RcjKc +LzGfx0aa1lMr2TnLQUSeLFZHFxsyyMXXuMPig3HK4A7SGFHupO+/1H/sL4xpH5zg +8+Zg2r8xnnney7abxcuv0uATWSIeKlNnb1ZO1BAxFnESc3GtyOCr2dUwZHX5mRVP ++Zxp2ni5qHNraf3wE2VPIQIDAQABoxIwEDAOBgNVHQ8BAf8EBAMCAKAwCwYJKoZI +hvcNAQELA4GBAIr2F7wsqmEU/J/kLyrCgEVXgaV/sKZq4pPNnzS0tBYk8fkV3V18 +sBJyHKRLL/wFZASvzDcVGCplXyMdAOCyfd8jO3F9Ac/xdlz10RrHJT75hNu3a7/n +9KNwKhfN4A1CQv2x372oGjRhCW5bHNCWx4PIVeNzCyq/KZhyY9sxHE6f +-----END CERTIFICATE----- +-----BEGIN PRIVATE KEY----- +MIICXgIBAAKBgQDK6NU0R0eiCYVquU4RcjKcLzGfx0aa1lMr2TnLQUSeLFZHFxsy +yMXXuMPig3HK4A7SGFHupO+/1H/sL4xpH5zg8+Zg2r8xnnney7abxcuv0uATWSIe +KlNnb1ZO1BAxFnESc3GtyOCr2dUwZHX5mRVP+Zxp2ni5qHNraf3wE2VPIQIDAQAB +AoGBALyvnSt7KUquDen7nXQtvJBudnf9KFPt//OjkdHHxNZNpoF/JCSqfQeoYkeu +MdAVYNLQGMiRifzZz4dDhA9xfUAuy7lcGQcMCxEQ1dwwuFaYkawbS0Tvy2PFlq2d +H5/HeDXU4EDJ3BZg0eYj2Bnkt1sJI35UKQSxblQ0MY2q0uFBAkEA5MMOogkgUx1C +67S1tFqMUSM8D0mZB0O5vOJZC5Gtt2Urju6vywge2ArExWRXlM2qGl8afFy2SgSv +Xk5eybcEiQJBAOMRwwbEoW5NYHuFFbSJyWll4n71CYuWuQOCzehDPyTb80WFZGLV +i91kFIjeERyq88eDE5xVB3ZuRiXqaShO/9kCQQCKOEkpInaDgZSjskZvuJ47kByD +6CYsO4GIXQMMeHML8ncFH7bb6AYq5ybJVb2NTU7QLFJmfeYuhvIm+xdOreRxAkEA +o5FC5Jg2FUfFzZSDmyZ6IONUsdF/i78KDV5nRv1R+hI6/oRlWNCtTNBv/lvBBd6b +dseUE9QoaQZsn5lpILEvmQJAZ0B+Or1rAYjnbjnUhdVZoy9kC4Zov+4UH3N/BtSy +KJRWUR0wTWfZBPZ5hAYZjTBEAFULaYCXlQKsODSp0M1aQA== +-----END PRIVATE KEY-----` diff --git a/scep/pkcs7/encrypt.go b/scep/pkcs7/encrypt.go new file mode 100644 index 00000000..da57ae64 --- /dev/null +++ b/scep/pkcs7/encrypt.go @@ -0,0 +1,399 @@ +package pkcs7 + +import ( + "bytes" + "crypto/aes" + "crypto/cipher" + "crypto/des" + "crypto/rand" + "crypto/rsa" + "crypto/x509" + "crypto/x509/pkix" + "encoding/asn1" + "errors" + "fmt" +) + +type envelopedData struct { + Version int + RecipientInfos []recipientInfo `asn1:"set"` + EncryptedContentInfo encryptedContentInfo +} + +type encryptedData struct { + Version int + EncryptedContentInfo encryptedContentInfo +} + +type recipientInfo struct { + Version int + IssuerAndSerialNumber issuerAndSerial + KeyEncryptionAlgorithm pkix.AlgorithmIdentifier + EncryptedKey []byte +} + +type encryptedContentInfo struct { + ContentType asn1.ObjectIdentifier + ContentEncryptionAlgorithm pkix.AlgorithmIdentifier + EncryptedContent asn1.RawValue `asn1:"tag:0,optional,explicit"` +} + +const ( + // EncryptionAlgorithmDESCBC is the DES CBC encryption algorithm + EncryptionAlgorithmDESCBC = iota + + // EncryptionAlgorithmAES128CBC is the AES 128 bits with CBC encryption algorithm + // Avoid this algorithm unless required for interoperability; use AES GCM instead. + EncryptionAlgorithmAES128CBC + + // EncryptionAlgorithmAES256CBC is the AES 256 bits with CBC encryption algorithm + // Avoid this algorithm unless required for interoperability; use AES GCM instead. + EncryptionAlgorithmAES256CBC + + // EncryptionAlgorithmAES128GCM is the AES 128 bits with GCM encryption algorithm + EncryptionAlgorithmAES128GCM + + // EncryptionAlgorithmAES256GCM is the AES 256 bits with GCM encryption algorithm + EncryptionAlgorithmAES256GCM +) + +// ContentEncryptionAlgorithm determines the algorithm used to encrypt the +// plaintext message. Change the value of this variable to change which +// algorithm is used in the Encrypt() function. +var ContentEncryptionAlgorithm = EncryptionAlgorithmDESCBC + +// ErrUnsupportedEncryptionAlgorithm is returned when attempting to encrypt +// content with an unsupported algorithm. +var ErrUnsupportedEncryptionAlgorithm = errors.New("pkcs7: cannot encrypt content: only DES-CBC, AES-CBC, and AES-GCM supported") + +// ErrPSKNotProvided is returned when attempting to encrypt +// using a PSK without actually providing the PSK. +var ErrPSKNotProvided = errors.New("pkcs7: cannot encrypt content: PSK not provided") + +const nonceSize = 12 + +type aesGCMParameters struct { + Nonce []byte `asn1:"tag:4"` + ICVLen int +} + +func encryptAESGCM(content []byte, key []byte) ([]byte, *encryptedContentInfo, error) { + var keyLen int + var algID asn1.ObjectIdentifier + switch ContentEncryptionAlgorithm { + case EncryptionAlgorithmAES128GCM: + keyLen = 16 + algID = OIDEncryptionAlgorithmAES128GCM + case EncryptionAlgorithmAES256GCM: + keyLen = 32 + algID = OIDEncryptionAlgorithmAES256GCM + default: + return nil, nil, fmt.Errorf("invalid ContentEncryptionAlgorithm in encryptAESGCM: %d", ContentEncryptionAlgorithm) + } + if key == nil { + // Create AES key + key = make([]byte, keyLen) + + _, err := rand.Read(key) + if err != nil { + return nil, nil, err + } + } + + // Create nonce + nonce := make([]byte, nonceSize) + + _, err := rand.Read(nonce) + if err != nil { + return nil, nil, err + } + + // Encrypt content + block, err := aes.NewCipher(key) + if err != nil { + return nil, nil, err + } + + gcm, err := cipher.NewGCM(block) + if err != nil { + return nil, nil, err + } + + ciphertext := gcm.Seal(nil, nonce, content, nil) + + // Prepare ASN.1 Encrypted Content Info + paramSeq := aesGCMParameters{ + Nonce: nonce, + ICVLen: gcm.Overhead(), + } + + paramBytes, err := asn1.Marshal(paramSeq) + if err != nil { + return nil, nil, err + } + + eci := encryptedContentInfo{ + ContentType: OIDData, + ContentEncryptionAlgorithm: pkix.AlgorithmIdentifier{ + Algorithm: algID, + Parameters: asn1.RawValue{ + Tag: asn1.TagSequence, + Bytes: paramBytes, + }, + }, + EncryptedContent: marshalEncryptedContent(ciphertext), + } + + return key, &eci, nil +} + +func encryptDESCBC(content []byte, key []byte) ([]byte, *encryptedContentInfo, error) { + if key == nil { + // Create DES key + key = make([]byte, 8) + + _, err := rand.Read(key) + if err != nil { + return nil, nil, err + } + } + + // Create CBC IV + iv := make([]byte, des.BlockSize) + _, err := rand.Read(iv) + if err != nil { + return nil, nil, err + } + + // Encrypt padded content + block, err := des.NewCipher(key) + if err != nil { + return nil, nil, err + } + mode := cipher.NewCBCEncrypter(block, iv) + plaintext, err := pad(content, mode.BlockSize()) + if err != nil { + return nil, nil, err + } + cyphertext := make([]byte, len(plaintext)) + mode.CryptBlocks(cyphertext, plaintext) + + // Prepare ASN.1 Encrypted Content Info + eci := encryptedContentInfo{ + ContentType: OIDData, + ContentEncryptionAlgorithm: pkix.AlgorithmIdentifier{ + Algorithm: OIDEncryptionAlgorithmDESCBC, + Parameters: asn1.RawValue{Tag: 4, Bytes: iv}, + }, + EncryptedContent: marshalEncryptedContent(cyphertext), + } + + return key, &eci, nil +} + +func encryptAESCBC(content []byte, key []byte) ([]byte, *encryptedContentInfo, error) { + var keyLen int + var algID asn1.ObjectIdentifier + switch ContentEncryptionAlgorithm { + case EncryptionAlgorithmAES128CBC: + keyLen = 16 + algID = OIDEncryptionAlgorithmAES128CBC + case EncryptionAlgorithmAES256CBC: + keyLen = 32 + algID = OIDEncryptionAlgorithmAES256CBC + default: + return nil, nil, fmt.Errorf("invalid ContentEncryptionAlgorithm in encryptAESCBC: %d", ContentEncryptionAlgorithm) + } + + if key == nil { + // Create AES key + key = make([]byte, keyLen) + + _, err := rand.Read(key) + if err != nil { + return nil, nil, err + } + } + + // Create CBC IV + iv := make([]byte, aes.BlockSize) + _, err := rand.Read(iv) + if err != nil { + return nil, nil, err + } + + // Encrypt padded content + block, err := aes.NewCipher(key) + if err != nil { + return nil, nil, err + } + mode := cipher.NewCBCEncrypter(block, iv) + plaintext, err := pad(content, mode.BlockSize()) + if err != nil { + return nil, nil, err + } + cyphertext := make([]byte, len(plaintext)) + mode.CryptBlocks(cyphertext, plaintext) + + // Prepare ASN.1 Encrypted Content Info + eci := encryptedContentInfo{ + ContentType: OIDData, + ContentEncryptionAlgorithm: pkix.AlgorithmIdentifier{ + Algorithm: algID, + Parameters: asn1.RawValue{Tag: 4, Bytes: iv}, + }, + EncryptedContent: marshalEncryptedContent(cyphertext), + } + + return key, &eci, nil +} + +// Encrypt creates and returns an envelope data PKCS7 structure with encrypted +// recipient keys for each recipient public key. +// +// The algorithm used to perform encryption is determined by the current value +// of the global ContentEncryptionAlgorithm package variable. By default, the +// value is EncryptionAlgorithmDESCBC. To use a different algorithm, change the +// value before calling Encrypt(). For example: +// +// ContentEncryptionAlgorithm = EncryptionAlgorithmAES128GCM +// +// TODO(fullsailor): Add support for encrypting content with other algorithms +func Encrypt(content []byte, recipients []*x509.Certificate) ([]byte, error) { + var eci *encryptedContentInfo + var key []byte + var err error + + // Apply chosen symmetric encryption method + switch ContentEncryptionAlgorithm { + case EncryptionAlgorithmDESCBC: + key, eci, err = encryptDESCBC(content, nil) + case EncryptionAlgorithmAES128CBC: + fallthrough + case EncryptionAlgorithmAES256CBC: + key, eci, err = encryptAESCBC(content, nil) + case EncryptionAlgorithmAES128GCM: + fallthrough + case EncryptionAlgorithmAES256GCM: + key, eci, err = encryptAESGCM(content, nil) + + default: + return nil, ErrUnsupportedEncryptionAlgorithm + } + + if err != nil { + return nil, err + } + + // Prepare each recipient's encrypted cipher key + recipientInfos := make([]recipientInfo, len(recipients)) + for i, recipient := range recipients { + encrypted, err := encryptKey(key, recipient) + if err != nil { + return nil, err + } + ias, err := cert2issuerAndSerial(recipient) + if err != nil { + return nil, err + } + info := recipientInfo{ + Version: 0, + IssuerAndSerialNumber: ias, + KeyEncryptionAlgorithm: pkix.AlgorithmIdentifier{ + Algorithm: OIDEncryptionAlgorithmRSA, + }, + EncryptedKey: encrypted, + } + recipientInfos[i] = info + } + + // Prepare envelope content + envelope := envelopedData{ + EncryptedContentInfo: *eci, + Version: 0, + RecipientInfos: recipientInfos, + } + innerContent, err := asn1.Marshal(envelope) + if err != nil { + return nil, err + } + + // Prepare outer payload structure + wrapper := contentInfo{ + ContentType: OIDEnvelopedData, + Content: asn1.RawValue{Class: 2, Tag: 0, IsCompound: true, Bytes: innerContent}, + } + + return asn1.Marshal(wrapper) +} + +// EncryptUsingPSK creates and returns an encrypted data PKCS7 structure, +// encrypted using caller provided pre-shared secret. +func EncryptUsingPSK(content []byte, key []byte) ([]byte, error) { + var eci *encryptedContentInfo + var err error + + if key == nil { + return nil, ErrPSKNotProvided + } + + // Apply chosen symmetric encryption method + switch ContentEncryptionAlgorithm { + case EncryptionAlgorithmDESCBC: + _, eci, err = encryptDESCBC(content, key) + + case EncryptionAlgorithmAES128GCM: + fallthrough + case EncryptionAlgorithmAES256GCM: + _, eci, err = encryptAESGCM(content, key) + + default: + return nil, ErrUnsupportedEncryptionAlgorithm + } + + if err != nil { + return nil, err + } + + // Prepare encrypted-data content + ed := encryptedData{ + Version: 0, + EncryptedContentInfo: *eci, + } + innerContent, err := asn1.Marshal(ed) + if err != nil { + return nil, err + } + + // Prepare outer payload structure + wrapper := contentInfo{ + ContentType: OIDEncryptedData, + Content: asn1.RawValue{Class: 2, Tag: 0, IsCompound: true, Bytes: innerContent}, + } + + return asn1.Marshal(wrapper) +} + +func marshalEncryptedContent(content []byte) asn1.RawValue { + asn1Content, _ := asn1.Marshal(content) + return asn1.RawValue{Tag: 0, Class: 2, Bytes: asn1Content, IsCompound: true} +} + +func encryptKey(key []byte, recipient *x509.Certificate) ([]byte, error) { + if pub := recipient.PublicKey.(*rsa.PublicKey); pub != nil { + return rsa.EncryptPKCS1v15(rand.Reader, pub, key) + } + return nil, ErrUnsupportedAlgorithm +} + +func pad(data []byte, blocklen int) ([]byte, error) { + if blocklen < 1 { + return nil, fmt.Errorf("invalid blocklen %d", blocklen) + } + padlen := blocklen - (len(data) % blocklen) + if padlen == 0 { + padlen = blocklen + } + pad := bytes.Repeat([]byte{byte(padlen)}, padlen) + return append(data, pad...), nil +} diff --git a/scep/pkcs7/encrypt_test.go b/scep/pkcs7/encrypt_test.go new file mode 100644 index 00000000..c64381e2 --- /dev/null +++ b/scep/pkcs7/encrypt_test.go @@ -0,0 +1,102 @@ +package pkcs7 + +import ( + "bytes" + "crypto/x509" + "testing" +) + +func TestEncrypt(t *testing.T) { + modes := []int{ + EncryptionAlgorithmDESCBC, + EncryptionAlgorithmAES128CBC, + EncryptionAlgorithmAES256CBC, + EncryptionAlgorithmAES128GCM, + EncryptionAlgorithmAES256GCM, + } + sigalgs := []x509.SignatureAlgorithm{ + x509.SHA1WithRSA, + x509.SHA256WithRSA, + x509.SHA512WithRSA, + } + for _, mode := range modes { + for _, sigalg := range sigalgs { + ContentEncryptionAlgorithm = mode + + plaintext := []byte("Hello Secret World!") + cert, err := createTestCertificate(sigalg) + if err != nil { + t.Fatal(err) + } + encrypted, err := Encrypt(plaintext, []*x509.Certificate{cert.Certificate}) + if err != nil { + t.Fatal(err) + } + p7, err := Parse(encrypted) + if err != nil { + t.Fatalf("cannot Parse encrypted result: %s", err) + } + result, err := p7.Decrypt(cert.Certificate, *cert.PrivateKey) + if err != nil { + t.Fatalf("cannot Decrypt encrypted result: %s", err) + } + if !bytes.Equal(plaintext, result) { + t.Errorf("encrypted data does not match plaintext:\n\tExpected: %s\n\tActual: %s", plaintext, result) + } + } + } +} + +func TestEncryptUsingPSK(t *testing.T) { + modes := []int{ + EncryptionAlgorithmDESCBC, + EncryptionAlgorithmAES128GCM, + } + + for _, mode := range modes { + ContentEncryptionAlgorithm = mode + plaintext := []byte("Hello Secret World!") + var key []byte + + switch mode { + case EncryptionAlgorithmDESCBC: + key = []byte("64BitKey") + case EncryptionAlgorithmAES128GCM: + key = []byte("128BitKey4AESGCM") + } + ciphertext, err := EncryptUsingPSK(plaintext, key) + if err != nil { + t.Fatal(err) + } + + p7, _ := Parse(ciphertext) + result, err := p7.DecryptUsingPSK(key) + if err != nil { + t.Fatalf("cannot Decrypt encrypted result: %s", err) + } + if !bytes.Equal(plaintext, result) { + t.Errorf("encrypted data does not match plaintext:\n\tExpected: %s\n\tActual: %s", plaintext, result) + } + } +} + +func TestPad(t *testing.T) { + tests := []struct { + Original []byte + Expected []byte + BlockSize int + }{ + {[]byte{0x1, 0x2, 0x3, 0x10}, []byte{0x1, 0x2, 0x3, 0x10, 0x4, 0x4, 0x4, 0x4}, 8}, + {[]byte{0x1, 0x2, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0}, []byte{0x1, 0x2, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8}, 8}, + } + for _, test := range tests { + padded, err := pad(test.Original, test.BlockSize) + if err != nil { + t.Errorf("pad encountered error: %s", err) + continue + } + if !bytes.Equal(test.Expected, padded) { + t.Errorf("pad results mismatch:\n\tExpected: %X\n\tActual: %X", test.Expected, padded) + } + } +} diff --git a/scep/pkcs7/pkcs7.go b/scep/pkcs7/pkcs7.go new file mode 100644 index 00000000..ccc6cc6d --- /dev/null +++ b/scep/pkcs7/pkcs7.go @@ -0,0 +1,291 @@ +// Package pkcs7 implements parsing and generation of some PKCS#7 structures. +package pkcs7 + +import ( + "bytes" + "crypto" + "crypto/dsa" + "crypto/ecdsa" + "crypto/rsa" + "crypto/x509" + "crypto/x509/pkix" + "encoding/asn1" + "errors" + "fmt" + "sort" + + _ "crypto/sha1" // for crypto.SHA1 +) + +// PKCS7 Represents a PKCS7 structure +type PKCS7 struct { + Content []byte + Certificates []*x509.Certificate + CRLs []pkix.CertificateList + Signers []signerInfo + raw interface{} +} + +type contentInfo struct { + ContentType asn1.ObjectIdentifier + Content asn1.RawValue `asn1:"explicit,optional,tag:0"` +} + +// ErrUnsupportedContentType is returned when a PKCS7 content is not supported. +// Currently only Data (1.2.840.113549.1.7.1), Signed Data (1.2.840.113549.1.7.2), +// and Enveloped Data are supported (1.2.840.113549.1.7.3) +var ErrUnsupportedContentType = errors.New("pkcs7: cannot parse data: unimplemented content type") + +type unsignedData []byte + +var ( + // Signed Data OIDs + OIDData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 1} + OIDSignedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 2} + OIDEnvelopedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 3} + OIDEncryptedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 6} + OIDAttributeContentType = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 3} + OIDAttributeMessageDigest = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 4} + OIDAttributeSigningTime = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 5} + + // Digest Algorithms + OIDDigestAlgorithmSHA1 = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 26} + OIDDigestAlgorithmSHA256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 1} + OIDDigestAlgorithmSHA384 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 2} + OIDDigestAlgorithmSHA512 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 3} + + OIDDigestAlgorithmDSA = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 1} + OIDDigestAlgorithmDSASHA1 = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 3} + + OIDDigestAlgorithmECDSASHA1 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 1} + OIDDigestAlgorithmECDSASHA256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 2} + OIDDigestAlgorithmECDSASHA384 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 3} + OIDDigestAlgorithmECDSASHA512 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 4} + + // Signature Algorithms + OIDEncryptionAlgorithmRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1} + OIDEncryptionAlgorithmRSASHA1 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 5} + OIDEncryptionAlgorithmRSASHA256 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 11} + OIDEncryptionAlgorithmRSASHA384 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 12} + OIDEncryptionAlgorithmRSASHA512 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 13} + + OIDEncryptionAlgorithmECDSAP256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 3, 1, 7} + OIDEncryptionAlgorithmECDSAP384 = asn1.ObjectIdentifier{1, 3, 132, 0, 34} + OIDEncryptionAlgorithmECDSAP521 = asn1.ObjectIdentifier{1, 3, 132, 0, 35} + + // Encryption Algorithms + OIDEncryptionAlgorithmDESCBC = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 7} + OIDEncryptionAlgorithmDESEDE3CBC = asn1.ObjectIdentifier{1, 2, 840, 113549, 3, 7} + OIDEncryptionAlgorithmAES256CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 42} + OIDEncryptionAlgorithmAES128GCM = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 6} + OIDEncryptionAlgorithmAES128CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 2} + OIDEncryptionAlgorithmAES256GCM = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 46} +) + +func getHashForOID(oid asn1.ObjectIdentifier) (crypto.Hash, error) { + switch { + case oid.Equal(OIDDigestAlgorithmSHA1), oid.Equal(OIDDigestAlgorithmECDSASHA1), + oid.Equal(OIDDigestAlgorithmDSA), oid.Equal(OIDDigestAlgorithmDSASHA1), + oid.Equal(OIDEncryptionAlgorithmRSA): + return crypto.SHA1, nil + case oid.Equal(OIDDigestAlgorithmSHA256), oid.Equal(OIDDigestAlgorithmECDSASHA256): + return crypto.SHA256, nil + case oid.Equal(OIDDigestAlgorithmSHA384), oid.Equal(OIDDigestAlgorithmECDSASHA384): + return crypto.SHA384, nil + case oid.Equal(OIDDigestAlgorithmSHA512), oid.Equal(OIDDigestAlgorithmECDSASHA512): + return crypto.SHA512, nil + } + return crypto.Hash(0), ErrUnsupportedAlgorithm +} + +// getDigestOIDForSignatureAlgorithm takes an x509.SignatureAlgorithm +// and returns the corresponding OID digest algorithm +func getDigestOIDForSignatureAlgorithm(digestAlg x509.SignatureAlgorithm) (asn1.ObjectIdentifier, error) { + switch digestAlg { + case x509.SHA1WithRSA, x509.ECDSAWithSHA1: + return OIDDigestAlgorithmSHA1, nil + case x509.SHA256WithRSA, x509.ECDSAWithSHA256: + return OIDDigestAlgorithmSHA256, nil + case x509.SHA384WithRSA, x509.ECDSAWithSHA384: + return OIDDigestAlgorithmSHA384, nil + case x509.SHA512WithRSA, x509.ECDSAWithSHA512: + return OIDDigestAlgorithmSHA512, nil + } + return nil, fmt.Errorf("pkcs7: cannot convert hash to oid, unknown hash algorithm") +} + +// getOIDForEncryptionAlgorithm takes the private key type of the signer and +// the OID of a digest algorithm to return the appropriate signerInfo.DigestEncryptionAlgorithm +func getOIDForEncryptionAlgorithm(pkey crypto.PrivateKey, OIDDigestAlg asn1.ObjectIdentifier) (asn1.ObjectIdentifier, error) { + switch pkey.(type) { + case *rsa.PrivateKey: + switch { + default: + return OIDEncryptionAlgorithmRSA, nil + case OIDDigestAlg.Equal(OIDEncryptionAlgorithmRSA): + return OIDEncryptionAlgorithmRSA, nil + case OIDDigestAlg.Equal(OIDDigestAlgorithmSHA1): + return OIDEncryptionAlgorithmRSASHA1, nil + case OIDDigestAlg.Equal(OIDDigestAlgorithmSHA256): + return OIDEncryptionAlgorithmRSASHA256, nil + case OIDDigestAlg.Equal(OIDDigestAlgorithmSHA384): + return OIDEncryptionAlgorithmRSASHA384, nil + case OIDDigestAlg.Equal(OIDDigestAlgorithmSHA512): + return OIDEncryptionAlgorithmRSASHA512, nil + } + case *ecdsa.PrivateKey: + switch { + case OIDDigestAlg.Equal(OIDDigestAlgorithmSHA1): + return OIDDigestAlgorithmECDSASHA1, nil + case OIDDigestAlg.Equal(OIDDigestAlgorithmSHA256): + return OIDDigestAlgorithmECDSASHA256, nil + case OIDDigestAlg.Equal(OIDDigestAlgorithmSHA384): + return OIDDigestAlgorithmECDSASHA384, nil + case OIDDigestAlg.Equal(OIDDigestAlgorithmSHA512): + return OIDDigestAlgorithmECDSASHA512, nil + } + case *dsa.PrivateKey: + return OIDDigestAlgorithmDSA, nil + } + return nil, fmt.Errorf("pkcs7: cannot convert encryption algorithm to oid, unknown private key type %T", pkey) + +} + +// Parse decodes a DER encoded PKCS7 package +func Parse(data []byte) (p7 *PKCS7, err error) { + if len(data) == 0 { + return nil, errors.New("pkcs7: input data is empty") + } + var info contentInfo + der, err := ber2der(data) + if err != nil { + return nil, err + } + rest, err := asn1.Unmarshal(der, &info) + if len(rest) > 0 { + err = asn1.SyntaxError{Msg: "trailing data"} + return + } + if err != nil { + return + } + + // fmt.Printf("--> Content Type: %s", info.ContentType) + switch { + case info.ContentType.Equal(OIDSignedData): + return parseSignedData(info.Content.Bytes) + case info.ContentType.Equal(OIDEnvelopedData): + return parseEnvelopedData(info.Content.Bytes) + case info.ContentType.Equal(OIDEncryptedData): + return parseEncryptedData(info.Content.Bytes) + } + return nil, ErrUnsupportedContentType +} + +func parseEnvelopedData(data []byte) (*PKCS7, error) { + var ed envelopedData + if _, err := asn1.Unmarshal(data, &ed); err != nil { + return nil, err + } + return &PKCS7{ + raw: ed, + }, nil +} + +func parseEncryptedData(data []byte) (*PKCS7, error) { + var ed encryptedData + if _, err := asn1.Unmarshal(data, &ed); err != nil { + return nil, err + } + return &PKCS7{ + raw: ed, + }, nil +} + +func (raw rawCertificates) Parse() ([]*x509.Certificate, error) { + if len(raw.Raw) == 0 { + return nil, nil + } + + var val asn1.RawValue + if _, err := asn1.Unmarshal(raw.Raw, &val); err != nil { + return nil, err + } + + return x509.ParseCertificates(val.Bytes) +} + +func isCertMatchForIssuerAndSerial(cert *x509.Certificate, ias issuerAndSerial) bool { + return cert.SerialNumber.Cmp(ias.SerialNumber) == 0 && bytes.Equal(cert.RawIssuer, ias.IssuerName.FullBytes) +} + +// Attribute represents a key value pair attribute. Value must be marshalable byte +// `encoding/asn1` +type Attribute struct { + Type asn1.ObjectIdentifier + Value interface{} +} + +type attributes struct { + types []asn1.ObjectIdentifier + values []interface{} +} + +// Add adds the attribute, maintaining insertion order +func (attrs *attributes) Add(attrType asn1.ObjectIdentifier, value interface{}) { + attrs.types = append(attrs.types, attrType) + attrs.values = append(attrs.values, value) +} + +type sortableAttribute struct { + SortKey []byte + Attribute attribute +} + +type attributeSet []sortableAttribute + +func (sa attributeSet) Len() int { + return len(sa) +} + +func (sa attributeSet) Less(i, j int) bool { + return bytes.Compare(sa[i].SortKey, sa[j].SortKey) < 0 +} + +func (sa attributeSet) Swap(i, j int) { + sa[i], sa[j] = sa[j], sa[i] +} + +func (sa attributeSet) Attributes() []attribute { + attrs := make([]attribute, len(sa)) + for i, attr := range sa { + attrs[i] = attr.Attribute + } + return attrs +} + +func (attrs *attributes) ForMarshalling() ([]attribute, error) { + sortables := make(attributeSet, len(attrs.types)) + for i := range sortables { + attrType := attrs.types[i] + attrValue := attrs.values[i] + asn1Value, err := asn1.Marshal(attrValue) + if err != nil { + return nil, err + } + attr := attribute{ + Type: attrType, + Value: asn1.RawValue{Tag: 17, IsCompound: true, Bytes: asn1Value}, // 17 == SET tag + } + encoded, err := asn1.Marshal(attr) + if err != nil { + return nil, err + } + sortables[i] = sortableAttribute{ + SortKey: encoded, + Attribute: attr, + } + } + sort.Sort(sortables) + return sortables.Attributes(), nil +} diff --git a/scep/pkcs7/pkcs7_test.go b/scep/pkcs7/pkcs7_test.go new file mode 100644 index 00000000..e743192d --- /dev/null +++ b/scep/pkcs7/pkcs7_test.go @@ -0,0 +1,326 @@ +package pkcs7 + +import ( + "crypto" + "crypto/dsa" + "crypto/ecdsa" + "crypto/elliptic" + "crypto/rand" + "crypto/rsa" + "crypto/x509" + "crypto/x509/pkix" + "encoding/pem" + "fmt" + "log" + "math/big" + "os" + "time" +) + +var test1024Key, test2048Key, test3072Key, test4096Key *rsa.PrivateKey + +func init() { + test1024Key = &rsa.PrivateKey{ + PublicKey: rsa.PublicKey{ + N: fromBase10("123024078101403810516614073341068864574068590522569345017786163424062310013967742924377390210586226651760719671658568413826602264886073432535341149584680111145880576802262550990305759285883150470245429547886689754596541046564560506544976611114898883158121012232676781340602508151730773214407220733898059285561"), + E: 65537, + }, + D: fromBase10("118892427340746627750435157989073921703209000249285930635312944544706203626114423392257295670807166199489096863209592887347935991101581502404113203993092422730000157893515953622392722273095289787303943046491132467130346663160540744582438810535626328230098940583296878135092036661410664695896115177534496784545"), + Primes: []*big.Int{ + fromBase10("12172745919282672373981903347443034348576729562395784527365032103134165674508405592530417723266847908118361582847315228810176708212888860333051929276459099"), + fromBase10("10106518193772789699356660087736308350857919389391620140340519320928952625438936098550728858345355053201610649202713962702543058578827268756755006576249339"), + }, + } + test1024Key.Precompute() + test2048Key = &rsa.PrivateKey{ + PublicKey: rsa.PublicKey{ + N: fromBase10("14314132931241006650998084889274020608918049032671858325988396851334124245188214251956198731333464217832226406088020736932173064754214329009979944037640912127943488972644697423190955557435910767690712778463524983667852819010259499695177313115447116110358524558307947613422897787329221478860907963827160223559690523660574329011927531289655711860504630573766609239332569210831325633840174683944553667352219670930408593321661375473885147973879086994006440025257225431977751512374815915392249179976902953721486040787792801849818254465486633791826766873076617116727073077821584676715609985777563958286637185868165868520557"), + E: 3, + }, + D: fromBase10("9542755287494004433998723259516013739278699355114572217325597900889416163458809501304132487555642811888150937392013824621448709836142886006653296025093941418628992648429798282127303704957273845127141852309016655778568546006839666463451542076964744073572349705538631742281931858219480985907271975884773482372966847639853897890615456605598071088189838676728836833012254065983259638538107719766738032720239892094196108713378822882383694456030043492571063441943847195939549773271694647657549658603365629458610273821292232646334717612674519997533901052790334279661754176490593041941863932308687197618671528035670452762731"), + Primes: []*big.Int{ + fromBase10("130903255182996722426771613606077755295583329135067340152947172868415809027537376306193179624298874215608270802054347609836776473930072411958753044562214537013874103802006369634761074377213995983876788718033850153719421695468704276694983032644416930879093914927146648402139231293035971427838068945045019075433"), + fromBase10("109348945610485453577574767652527472924289229538286649661240938988020367005475727988253438647560958573506159449538793540472829815903949343191091817779240101054552748665267574271163617694640513549693841337820602726596756351006149518830932261246698766355347898158548465400674856021497190430791824869615170301029"), + }, + } + test2048Key.Precompute() + test3072Key = &rsa.PrivateKey{ + PublicKey: rsa.PublicKey{ + N: fromBase10("4799422180968749215324244710281712119910779465109490663934897082847293004098645365195947978124390029272750644394844443980065532911010718425428791498896288210928474905407341584968381379157418577471272697781778686372450913810019702928839200328075568223462554606149618941566459398862673532997592879359280754226882565483298027678735544377401276021471356093819491755877827249763065753555051973844057308627201762456191918852016986546071426986328720794061622370410645440235373576002278045257207695462423797272017386006110722769072206022723167102083033531426777518054025826800254337147514768377949097720074878744769255210076910190151785807232805749219196645305822228090875616900385866236956058984170647782567907618713309775105943700661530312800231153745705977436176908325539234432407050398510090070342851489496464612052853185583222422124535243967989533830816012180864309784486694786581956050902756173889941244024888811572094961378021"), + E: 65537, + }, + D: fromBase10("4068124900056380177006532461065648259352178312499768312132802353620854992915205894105621345694615110794369150964768050224096623567443679436821868510233726084582567244003894477723706516831312989564775159596496449435830457803384416702014837685962523313266832032687145914871879794104404800823188153886925022171560391765913739346955738372354826804228989767120353182641396181570533678315099748218734875742705419933837638038793286534641711407564379950728858267828581787483317040753987167237461567332386718574803231955771633274184646232632371006762852623964054645811527580417392163873708539175349637050049959954373319861427407953413018816604365474462455009323937599275324390953644555294418021286807661559165324810415569396577697316798600308544755741549699523972971375304826663847015905713096287495342701286542193782001358775773848824496321550110946106870685499577993864871847542645561943034990484973293461948058147956373115641615329"), + Primes: []*big.Int{ + fromBase10("2378529069722721185825622840841310902793949682948530343491428052737890236476884657507685118578733560141370511507721598189068683665232991988491561624429938984370132428230072355214627085652359350722926394699707232921674771664421591347888367477300909202851476404132163673865768760147403525700174918450753162242834161458300343282159799476695001920226357456953682236859505243928716782707623075239350380352265954107362618991716602898266999700316937680986690964564264877"), + fromBase10("2017811025336026464312837780072272578817919741496395062543647660689775637351085991504709917848745137013798005682591633910555599626950744674459976829106750083386168859581016361317479081273480343110649405858059581933773354781034946787147300862495438979895430001323443224335618577322449133208754541656374335100929456885995320929464029817626916719434010943205170760536768893924932021302887114400922813817969176636993508191950649313115712159241971065134077636674146073"), + }, + } + test3072Key.Precompute() + test4096Key = &rsa.PrivateKey{ + PublicKey: rsa.PublicKey{ + N: fromBase10("633335480064287130853997429184971616419051348693342219741748040433588285601270210251206421401040394238592139790962887290698043839174341843721930134010306454716566698330215646704263665452264344664385995704186692432827662862845900348526672531755932642433662686500295989783595767573119607065791980381547677840410600100715146047382485989885183858757974681241303484641390718944520330953604501686666386926996348457928415093305041429178744778762826377713889019740060910363468343855830206640274442887621960581569183233822878661711798998132931623726434336448716605363514220760343097572198620479297583609779817750646169845195672483600293522186340560792255595411601450766002877850696008003794520089358819042318331840490155176019070646738739580486357084733208876620846449161909966690602374519398451042362690200166144326179405976024265116931974936425064291406950542193873313447617169603706868220189295654943247311295475722243471700112334609817776430552541319671117235957754556272646031356496763094955985615723596562217985372503002989591679252640940571608314743271809251568670314461039035793703429977801961867815257832671786542212589906513979094156334941265621017752516999186481477500481433634914622735206243841674973785078408289183000133399026553"), + E: 65537, + }, + D: fromBase10("439373650557744155078930178606343279553665694488479749802070836418412881168612407941793966086633543867614175621952769177088930851151267623886678906158545451731745754402575409204816390946376103491325109185445659065122640946673660760274557781540431107937331701243915001777636528502669576801704352961341634812275635811512806966908648671988644114352046582195051714797831307925775689566757438907578527366568747104508496278929566712224252103563340770696548181508180254674236716995730292431858611476396845443056967589437890065663497768422598977743046882539288481002449571403783500529740184608873520856954837631427724158592309018382711485601884461168736465751756282510065053161144027097169985941910909130083273691945578478173708396726266170473745329617793866669307716920992380350270584929908460462802627239204245339385636926433446418108504614031393494119344916828744888432279343816084433424594432427362258172264834429525166677273382617457205387388293888430391895615438030066428745187333897518037597413369705720436392869403948934993623418405908467147848576977008003556716087129242155836114780890054057743164411952731290520995017097151300091841286806603044227906213832083363876549637037625314539090155417589796428888619937329669464810549362433"), + Primes: []*big.Int{ + fromBase10("25745433817240673759910623230144796182285844101796353869339294232644316274580053211056707671663014355388701931204078502829809738396303142990312095225333440050808647355535878394534263839500592870406002873182360027755750148248672968563366185348499498613479490545488025779331426515670185366021612402246813511722553210128074701620113404560399242413747318161403908617342170447610792422053460359960010544593668037305465806912471260799852789913123044326555978680190904164976511331681163576833618899773550873682147782263100803907156362439021929408298804955194748640633152519828940133338948391986823456836070708197320166146761"), + fromBase10("24599914864909676687852658457515103765368967514652318497893275892114442089314173678877914038802355565271545910572804267918959612739009937926962653912943833939518967731764560204997062096919833970670512726396663920955497151415639902788974842698619579886297871162402643104696160155894685518587660015182381685605752989716946154299190561137541792784125356553411300817844325739404126956793095254412123887617931225840421856505925283322918693259047428656823141903489964287619982295891439430302405252447010728112098326033634688757933930065610737780413018498561434074501822951716586796047404555397992425143397497639322075233073"), + }, + } + test4096Key.Precompute() +} + +func fromBase10(base10 string) *big.Int { + i, ok := new(big.Int).SetString(base10, 10) + if !ok { + panic("bad number: " + base10) + } + return i +} + +type certKeyPair struct { + Certificate *x509.Certificate + PrivateKey *crypto.PrivateKey +} + +func createTestCertificate(sigAlg x509.SignatureAlgorithm) (certKeyPair, error) { + signer, err := createTestCertificateByIssuer("Eddard Stark", nil, sigAlg, true) + if err != nil { + return certKeyPair{}, err + } + pair, err := createTestCertificateByIssuer("Jon Snow", signer, sigAlg, false) + if err != nil { + return certKeyPair{}, err + } + return *pair, nil +} + +func createTestCertificateByIssuer(name string, issuer *certKeyPair, sigAlg x509.SignatureAlgorithm, isCA bool) (*certKeyPair, error) { + var ( + err error + priv crypto.PrivateKey + derCert []byte + issuerCert *x509.Certificate + issuerKey crypto.PrivateKey + ) + serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 32) + serialNumber, err := rand.Int(rand.Reader, serialNumberLimit) + if err != nil { + return nil, err + } + + template := x509.Certificate{ + SerialNumber: serialNumber, + Subject: pkix.Name{ + CommonName: name, + Organization: []string{"Acme Co"}, + }, + NotBefore: time.Now().Add(-1 *time.Second), + NotAfter: time.Now().AddDate(1, 0, 0), + KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature, + ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageEmailProtection}, + } + if issuer != nil { + issuerCert = issuer.Certificate + issuerKey = *issuer.PrivateKey + } + switch sigAlg { + case x509.SHA1WithRSA: + priv = test1024Key + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA1WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA1 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA1 + } + case x509.SHA256WithRSA: + priv = test2048Key + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA256WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA256 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA256 + } + case x509.SHA384WithRSA: + priv = test3072Key + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA384WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA384 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA256 + } + case x509.SHA512WithRSA: + priv = test4096Key + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA512WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA512 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA256 + } + case x509.ECDSAWithSHA1: + priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader) + if err != nil { + return nil, err + } + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA1WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA1 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA1 + } + case x509.ECDSAWithSHA256: + priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader) + if err != nil { + return nil, err + } + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA256WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA256 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA256 + } + case x509.ECDSAWithSHA384: + priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader) + if err != nil { + return nil, err + } + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA384WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA384 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA256 + } + case x509.ECDSAWithSHA512: + priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader) + if err != nil { + return nil, err + } + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA512WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA512 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA256 + } + case x509.DSAWithSHA1: + var dsaPriv dsa.PrivateKey + params := &dsaPriv.Parameters + err = dsa.GenerateParameters(params, rand.Reader, dsa.L1024N160) + if err != nil { + return nil, err + } + err = dsa.GenerateKey(&dsaPriv, rand.Reader) + if err != nil { + return nil, err + } + switch issuerKey.(type) { + case *rsa.PrivateKey: + template.SignatureAlgorithm = x509.SHA1WithRSA + case *ecdsa.PrivateKey: + template.SignatureAlgorithm = x509.ECDSAWithSHA1 + case *dsa.PrivateKey: + template.SignatureAlgorithm = x509.DSAWithSHA1 + } + priv = &dsaPriv + } + if isCA { + template.IsCA = true + template.KeyUsage |= x509.KeyUsageCertSign + template.BasicConstraintsValid = true + } + if issuer == nil { + // no issuer given,make this a self-signed root cert + issuerCert = &template + issuerKey = priv + } + + log.Println("creating cert", name, "issued by", issuerCert.Subject.CommonName, "with sigalg", sigAlg) + switch priv.(type) { + case *rsa.PrivateKey: + switch issuerKey.(type) { + case *rsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.(*rsa.PrivateKey).Public(), issuerKey.(*rsa.PrivateKey)) + case *ecdsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.(*rsa.PrivateKey).Public(), issuerKey.(*ecdsa.PrivateKey)) + case *dsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.(*rsa.PrivateKey).Public(), issuerKey.(*dsa.PrivateKey)) + } + case *ecdsa.PrivateKey: + switch issuerKey.(type) { + case *rsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.(*ecdsa.PrivateKey).Public(), issuerKey.(*rsa.PrivateKey)) + case *ecdsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.(*ecdsa.PrivateKey).Public(), issuerKey.(*ecdsa.PrivateKey)) + case *dsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.(*ecdsa.PrivateKey).Public(), issuerKey.(*dsa.PrivateKey)) + } + case *dsa.PrivateKey: + pub := &priv.(*dsa.PrivateKey).PublicKey + switch issuerKey := issuerKey.(type) { + case *rsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, pub, issuerKey) + case *ecdsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.(*dsa.PublicKey), issuerKey) + case *dsa.PrivateKey: + derCert, err = x509.CreateCertificate(rand.Reader, &template, issuerCert, priv.(*dsa.PublicKey), issuerKey) + } + } + if err != nil { + return nil, err + } + if len(derCert) == 0 { + return nil, fmt.Errorf("no certificate created, probably due to wrong keys. types were %T and %T", priv, issuerKey) + } + cert, err := x509.ParseCertificate(derCert) + if err != nil { + return nil, err + } + pem.Encode(os.Stdout, &pem.Block{Type: "CERTIFICATE", Bytes: cert.Raw}) + return &certKeyPair{ + Certificate: cert, + PrivateKey: &priv, + }, nil +} + +type TestFixture struct { + Input []byte + Certificate *x509.Certificate + PrivateKey *rsa.PrivateKey +} + +func UnmarshalTestFixture(testPEMBlock string) TestFixture { + var result TestFixture + var derBlock *pem.Block + var pemBlock = []byte(testPEMBlock) + for { + derBlock, pemBlock = pem.Decode(pemBlock) + if derBlock == nil { + break + } + switch derBlock.Type { + case "PKCS7": + result.Input = derBlock.Bytes + case "CERTIFICATE": + result.Certificate, _ = x509.ParseCertificate(derBlock.Bytes) + case "PRIVATE KEY": + result.PrivateKey, _ = x509.ParsePKCS1PrivateKey(derBlock.Bytes) + } + } + + return result +} diff --git a/scep/pkcs7/sign.go b/scep/pkcs7/sign.go new file mode 100644 index 00000000..addd7638 --- /dev/null +++ b/scep/pkcs7/sign.go @@ -0,0 +1,429 @@ +package pkcs7 + +import ( + "bytes" + "crypto" + "crypto/dsa" + "crypto/rand" + "crypto/x509" + "crypto/x509/pkix" + "encoding/asn1" + "errors" + "fmt" + "math/big" + "time" +) + +// SignedData is an opaque data structure for creating signed data payloads +type SignedData struct { + sd signedData + certs []*x509.Certificate + data, messageDigest []byte + digestOid asn1.ObjectIdentifier + encryptionOid asn1.ObjectIdentifier +} + +// NewSignedData takes data and initializes a PKCS7 SignedData struct that is +// ready to be signed via AddSigner. The digest algorithm is set to SHA1 by default +// and can be changed by calling SetDigestAlgorithm. +func NewSignedData(data []byte) (*SignedData, error) { + content, err := asn1.Marshal(data) + if err != nil { + return nil, err + } + ci := contentInfo{ + ContentType: OIDData, + Content: asn1.RawValue{Class: 2, Tag: 0, Bytes: content, IsCompound: true}, + } + sd := signedData{ + ContentInfo: ci, + Version: 1, + } + return &SignedData{sd: sd, data: data, digestOid: OIDDigestAlgorithmSHA1}, nil +} + +// SignerInfoConfig are optional values to include when adding a signer +type SignerInfoConfig struct { + ExtraSignedAttributes []Attribute + ExtraUnsignedAttributes []Attribute +} + +type signedData struct { + Version int `asn1:"default:1"` + DigestAlgorithmIdentifiers []pkix.AlgorithmIdentifier `asn1:"set"` + ContentInfo contentInfo + Certificates rawCertificates `asn1:"optional,tag:0"` + CRLs []pkix.CertificateList `asn1:"optional,tag:1"` + SignerInfos []signerInfo `asn1:"set"` +} + +type signerInfo struct { + Version int `asn1:"default:1"` + IssuerAndSerialNumber issuerAndSerial + DigestAlgorithm pkix.AlgorithmIdentifier + AuthenticatedAttributes []attribute `asn1:"optional,omitempty,tag:0"` + DigestEncryptionAlgorithm pkix.AlgorithmIdentifier + EncryptedDigest []byte + UnauthenticatedAttributes []attribute `asn1:"optional,omitempty,tag:1"` +} + +type attribute struct { + Type asn1.ObjectIdentifier + Value asn1.RawValue `asn1:"set"` +} + +func marshalAttributes(attrs []attribute) ([]byte, error) { + encodedAttributes, err := asn1.Marshal(struct { + A []attribute `asn1:"set"` + }{A: attrs}) + if err != nil { + return nil, err + } + + // Remove the leading sequence octets + var raw asn1.RawValue + asn1.Unmarshal(encodedAttributes, &raw) + return raw.Bytes, nil +} + +type rawCertificates struct { + Raw asn1.RawContent +} + +type issuerAndSerial struct { + IssuerName asn1.RawValue + SerialNumber *big.Int +} + +// SetDigestAlgorithm sets the digest algorithm to be used in the signing process. +// +// This should be called before adding signers +func (sd *SignedData) SetDigestAlgorithm(d asn1.ObjectIdentifier) { + sd.digestOid = d +} + +// SetEncryptionAlgorithm sets the encryption algorithm to be used in the signing process. +// +// This should be called before adding signers +func (sd *SignedData) SetEncryptionAlgorithm(d asn1.ObjectIdentifier) { + sd.encryptionOid = d +} + +// AddSigner is a wrapper around AddSignerChain() that adds a signer without any parent. +func (sd *SignedData) AddSigner(ee *x509.Certificate, pkey crypto.PrivateKey, config SignerInfoConfig) error { + var parents []*x509.Certificate + return sd.AddSignerChain(ee, pkey, parents, config) +} + +// AddSignerChain signs attributes about the content and adds certificates +// and signers infos to the Signed Data. The certificate and private key +// of the end-entity signer are used to issue the signature, and any +// parent of that end-entity that need to be added to the list of +// certifications can be specified in the parents slice. +// +// The signature algorithm used to hash the data is the one of the end-entity +// certificate. +func (sd *SignedData) AddSignerChain(ee *x509.Certificate, pkey crypto.PrivateKey, parents []*x509.Certificate, config SignerInfoConfig) error { +// Following RFC 2315, 9.2 SignerInfo type, the distinguished name of +// the issuer of the end-entity signer is stored in the issuerAndSerialNumber +// section of the SignedData.SignerInfo, alongside the serial number of +// the end-entity. + var ias issuerAndSerial + ias.SerialNumber = ee.SerialNumber + if len(parents) == 0 { + // no parent, the issuer is the end-entity cert itself + ias.IssuerName = asn1.RawValue{FullBytes: ee.RawIssuer} + } else { + err := verifyPartialChain(ee, parents) + if err != nil { + return err + } + // the first parent is the issuer + ias.IssuerName = asn1.RawValue{FullBytes: parents[0].RawSubject} + } + sd.sd.DigestAlgorithmIdentifiers = append(sd.sd.DigestAlgorithmIdentifiers, + pkix.AlgorithmIdentifier{Algorithm: sd.digestOid}, + ) + hash, err := getHashForOID(sd.digestOid) + if err != nil { + return err + } + h := hash.New() + h.Write(sd.data) + sd.messageDigest = h.Sum(nil) + encryptionOid, err := getOIDForEncryptionAlgorithm(pkey, sd.digestOid) + if err != nil { + return err + } + attrs := &attributes{} + attrs.Add(OIDAttributeContentType, sd.sd.ContentInfo.ContentType) + attrs.Add(OIDAttributeMessageDigest, sd.messageDigest) + attrs.Add(OIDAttributeSigningTime, time.Now().UTC()) + for _, attr := range config.ExtraSignedAttributes { + attrs.Add(attr.Type, attr.Value) + } + finalAttrs, err := attrs.ForMarshalling() + if err != nil { + return err + } + unsignedAttrs := &attributes{} + for _, attr := range config.ExtraUnsignedAttributes { + unsignedAttrs.Add(attr.Type, attr.Value) + } + finalUnsignedAttrs, err := unsignedAttrs.ForMarshalling() + if err != nil { + return err + } + // create signature of signed attributes + signature, err := signAttributes(finalAttrs, pkey, hash) + if err != nil { + return err + } + signer := signerInfo{ + AuthenticatedAttributes: finalAttrs, + UnauthenticatedAttributes: finalUnsignedAttrs, + DigestAlgorithm: pkix.AlgorithmIdentifier{Algorithm: sd.digestOid}, + DigestEncryptionAlgorithm: pkix.AlgorithmIdentifier{Algorithm: encryptionOid}, + IssuerAndSerialNumber: ias, + EncryptedDigest: signature, + Version: 1, + } + sd.certs = append(sd.certs, ee) + if len(parents) > 0 { + sd.certs = append(sd.certs, parents...) + } + sd.sd.SignerInfos = append(sd.sd.SignerInfos, signer) + return nil +} + +// SignWithoutAttr issues a signature on the content of the pkcs7 SignedData. +// Unlike AddSigner/AddSignerChain, it calculates the digest on the data alone +// and does not include any signed attributes like timestamp and so on. +// +// This function is needed to sign old Android APKs, something you probably +// shouldn't do unless you're maintaining backward compatibility for old +// applications. +func (sd *SignedData) SignWithoutAttr(ee *x509.Certificate, pkey crypto.PrivateKey, config SignerInfoConfig) error { + var signature []byte + sd.sd.DigestAlgorithmIdentifiers = append(sd.sd.DigestAlgorithmIdentifiers, pkix.AlgorithmIdentifier{Algorithm: sd.digestOid}) + hash, err := getHashForOID(sd.digestOid) + if err != nil { + return err + } + h := hash.New() + h.Write(sd.data) + sd.messageDigest = h.Sum(nil) + switch pkey := pkey.(type) { + case *dsa.PrivateKey: + // dsa doesn't implement crypto.Signer so we make a special case + // https://github.com/golang/go/issues/27889 + r, s, err := dsa.Sign(rand.Reader, pkey, sd.messageDigest) + if err != nil { + return err + } + signature, err = asn1.Marshal(dsaSignature{r, s}) + if err != nil { + return err + } + default: + key, ok := pkey.(crypto.Signer) + if !ok { + return errors.New("pkcs7: private key does not implement crypto.Signer") + } + signature, err = key.Sign(rand.Reader, sd.messageDigest, hash) + if err != nil { + return err + } + } + var ias issuerAndSerial + ias.SerialNumber = ee.SerialNumber + // no parent, the issue is the end-entity cert itself + ias.IssuerName = asn1.RawValue{FullBytes: ee.RawIssuer} + if sd.encryptionOid == nil { + // if the encryption algorithm wasn't set by SetEncryptionAlgorithm, + // infer it from the digest algorithm + sd.encryptionOid, err = getOIDForEncryptionAlgorithm(pkey, sd.digestOid) + } + if err != nil { + return err + } + signer := signerInfo{ + DigestAlgorithm: pkix.AlgorithmIdentifier{Algorithm: sd.digestOid}, + DigestEncryptionAlgorithm: pkix.AlgorithmIdentifier{Algorithm: sd.encryptionOid}, + IssuerAndSerialNumber: ias, + EncryptedDigest: signature, + Version: 1, + } + // create signature of signed attributes + sd.certs = append(sd.certs, ee) + sd.sd.SignerInfos = append(sd.sd.SignerInfos, signer) + return nil +} + +func (si *signerInfo) SetUnauthenticatedAttributes(extraUnsignedAttrs []Attribute) error { + unsignedAttrs := &attributes{} + for _, attr := range extraUnsignedAttrs { + unsignedAttrs.Add(attr.Type, attr.Value) + } + finalUnsignedAttrs, err := unsignedAttrs.ForMarshalling() + if err != nil { + return err + } + + si.UnauthenticatedAttributes = finalUnsignedAttrs + + return nil +} + +// AddCertificate adds the certificate to the payload. Useful for parent certificates +func (sd *SignedData) AddCertificate(cert *x509.Certificate) { + sd.certs = append(sd.certs, cert) +} + +// Detach removes content from the signed data struct to make it a detached signature. +// This must be called right before Finish() +func (sd *SignedData) Detach() { + sd.sd.ContentInfo = contentInfo{ContentType: OIDData} +} + +// GetSignedData returns the private Signed Data +func (sd *SignedData) GetSignedData() *signedData { + return &sd.sd +} + +// Finish marshals the content and its signers +func (sd *SignedData) Finish() ([]byte, error) { + sd.sd.Certificates = marshalCertificates(sd.certs) + inner, err := asn1.Marshal(sd.sd) + if err != nil { + return nil, err + } + outer := contentInfo{ + ContentType: OIDSignedData, + Content: asn1.RawValue{Class: 2, Tag: 0, Bytes: inner, IsCompound: true}, + } + return asn1.Marshal(outer) +} + +// RemoveAuthenticatedAttributes removes authenticated attributes from signedData +// similar to OpenSSL's PKCS7_NOATTR or -noattr flags +func (sd *SignedData) RemoveAuthenticatedAttributes() { + for i := range sd.sd.SignerInfos { + sd.sd.SignerInfos[i].AuthenticatedAttributes = nil + } +} + +// RemoveUnauthenticatedAttributes removes unauthenticated attributes from signedData +func (sd *SignedData) RemoveUnauthenticatedAttributes() { + for i := range sd.sd.SignerInfos { + sd.sd.SignerInfos[i].UnauthenticatedAttributes = nil + } +} + +// verifyPartialChain checks that a given cert is issued by the first parent in the list, +// then continue down the path. It doesn't require the last parent to be a root CA, +// or to be trusted in any truststore. It simply verifies that the chain provided, albeit +// partial, makes sense. +func verifyPartialChain(cert *x509.Certificate, parents []*x509.Certificate) error { + if len(parents) == 0 { + return fmt.Errorf("pkcs7: zero parents provided to verify the signature of certificate %q", cert.Subject.CommonName) + } + err := cert.CheckSignatureFrom(parents[0]) + if err != nil { + return fmt.Errorf("pkcs7: certificate signature from parent is invalid: %v", err) + } + if len(parents) == 1 { + // there is no more parent to check, return + return nil + } + return verifyPartialChain(parents[0], parents[1:]) +} + +func cert2issuerAndSerial(cert *x509.Certificate) (issuerAndSerial, error) { + var ias issuerAndSerial + // The issuer RDNSequence has to match exactly the sequence in the certificate + // We cannot use cert.Issuer.ToRDNSequence() here since it mangles the sequence + ias.IssuerName = asn1.RawValue{FullBytes: cert.RawIssuer} + ias.SerialNumber = cert.SerialNumber + + return ias, nil +} + +// signs the DER encoded form of the attributes with the private key +func signAttributes(attrs []attribute, pkey crypto.PrivateKey, digestAlg crypto.Hash) ([]byte, error) { + attrBytes, err := marshalAttributes(attrs) + if err != nil { + return nil, err + } + h := digestAlg.New() + h.Write(attrBytes) + hash := h.Sum(nil) + + // dsa doesn't implement crypto.Signer so we make a special case + // https://github.com/golang/go/issues/27889 + switch pkey := pkey.(type) { + case *dsa.PrivateKey: + r, s, err := dsa.Sign(rand.Reader, pkey, hash) + if err != nil { + return nil, err + } + return asn1.Marshal(dsaSignature{r, s}) + } + + key, ok := pkey.(crypto.Signer) + if !ok { + return nil, errors.New("pkcs7: private key does not implement crypto.Signer") + } + return key.Sign(rand.Reader, hash, digestAlg) +} + +type dsaSignature struct { + R, S *big.Int +} + +// concats and wraps the certificates in the RawValue structure +func marshalCertificates(certs []*x509.Certificate) rawCertificates { + var buf bytes.Buffer + for _, cert := range certs { + buf.Write(cert.Raw) + } + rawCerts, _ := marshalCertificateBytes(buf.Bytes()) + return rawCerts +} + +// Even though, the tag & length are stripped out during marshalling the +// RawContent, we have to encode it into the RawContent. If its missing, +// then `asn1.Marshal()` will strip out the certificate wrapper instead. +func marshalCertificateBytes(certs []byte) (rawCertificates, error) { + var val = asn1.RawValue{Bytes: certs, Class: 2, Tag: 0, IsCompound: true} + b, err := asn1.Marshal(val) + if err != nil { + return rawCertificates{}, err + } + return rawCertificates{Raw: b}, nil +} + +// DegenerateCertificate creates a signed data structure containing only the +// provided certificate or certificate chain. +func DegenerateCertificate(cert []byte) ([]byte, error) { + rawCert, err := marshalCertificateBytes(cert) + if err != nil { + return nil, err + } + emptyContent := contentInfo{ContentType: OIDData} + sd := signedData{ + Version: 1, + ContentInfo: emptyContent, + Certificates: rawCert, + CRLs: []pkix.CertificateList{}, + } + content, err := asn1.Marshal(sd) + if err != nil { + return nil, err + } + signedContent := contentInfo{ + ContentType: OIDSignedData, + Content: asn1.RawValue{Class: 2, Tag: 0, Bytes: content, IsCompound: true}, + } + return asn1.Marshal(signedContent) +} diff --git a/scep/pkcs7/sign_test.go b/scep/pkcs7/sign_test.go new file mode 100644 index 00000000..0ba6324d --- /dev/null +++ b/scep/pkcs7/sign_test.go @@ -0,0 +1,266 @@ +package pkcs7 + +import ( + "bytes" + "crypto/dsa" + "crypto/x509" + "encoding/asn1" + "encoding/pem" + "fmt" + "io/ioutil" + "log" + "math/big" + "os" + "os/exec" + "testing" +) + +func TestSign(t *testing.T) { + content := []byte("Hello World") + sigalgs := []x509.SignatureAlgorithm{ + x509.SHA1WithRSA, + x509.SHA256WithRSA, + x509.SHA512WithRSA, + x509.ECDSAWithSHA1, + x509.ECDSAWithSHA256, + x509.ECDSAWithSHA384, + x509.ECDSAWithSHA512, + } + for _, sigalgroot := range sigalgs { + rootCert, err := createTestCertificateByIssuer("PKCS7 Test Root CA", nil, sigalgroot, true) + if err != nil { + t.Fatalf("test %s: cannot generate root cert: %s", sigalgroot, err) + } + truststore := x509.NewCertPool() + truststore.AddCert(rootCert.Certificate) + for _, sigalginter := range sigalgs { + interCert, err := createTestCertificateByIssuer("PKCS7 Test Intermediate Cert", rootCert, sigalginter, true) + if err != nil { + t.Fatalf("test %s/%s: cannot generate intermediate cert: %s", sigalgroot, sigalginter, err) + } + var parents []*x509.Certificate + parents = append(parents, interCert.Certificate) + for _, sigalgsigner := range sigalgs { + signerCert, err := createTestCertificateByIssuer("PKCS7 Test Signer Cert", interCert, sigalgsigner, false) + if err != nil { + t.Fatalf("test %s/%s/%s: cannot generate signer cert: %s", sigalgroot, sigalginter, sigalgsigner, err) + } + for _, testDetach := range []bool{false, true} { + log.Printf("test %s/%s/%s detached %t\n", sigalgroot, sigalginter, sigalgsigner, testDetach) + toBeSigned, err := NewSignedData(content) + if err != nil { + t.Fatalf("test %s/%s/%s: cannot initialize signed data: %s", sigalgroot, sigalginter, sigalgsigner, err) + } + + // Set the digest to match the end entity cert + signerDigest, _ := getDigestOIDForSignatureAlgorithm(signerCert.Certificate.SignatureAlgorithm) + toBeSigned.SetDigestAlgorithm(signerDigest) + + if err := toBeSigned.AddSignerChain(signerCert.Certificate, *signerCert.PrivateKey, parents, SignerInfoConfig{}); err != nil { + t.Fatalf("test %s/%s/%s: cannot add signer: %s", sigalgroot, sigalginter, sigalgsigner, err) + } + if testDetach { + toBeSigned.Detach() + } + signed, err := toBeSigned.Finish() + if err != nil { + t.Fatalf("test %s/%s/%s: cannot finish signing data: %s", sigalgroot, sigalginter, sigalgsigner, err) + } + pem.Encode(os.Stdout, &pem.Block{Type: "PKCS7", Bytes: signed}) + p7, err := Parse(signed) + if err != nil { + t.Fatalf("test %s/%s/%s: cannot parse signed data: %s", sigalgroot, sigalginter, sigalgsigner, err) + } + if testDetach { + p7.Content = content + } + if !bytes.Equal(content, p7.Content) { + t.Errorf("test %s/%s/%s: content was not found in the parsed data:\n\tExpected: %s\n\tActual: %s", sigalgroot, sigalginter, sigalgsigner, content, p7.Content) + } + if err := p7.VerifyWithChain(truststore); err != nil { + t.Errorf("test %s/%s/%s: cannot verify signed data: %s", sigalgroot, sigalginter, sigalgsigner, err) + } + if !signerDigest.Equal(p7.Signers[0].DigestAlgorithm.Algorithm) { + t.Errorf("test %s/%s/%s: expected digest algorithm %q but got %q", + sigalgroot, sigalginter, sigalgsigner, signerDigest, p7.Signers[0].DigestAlgorithm.Algorithm) + } + } + } + } + } +} + +func TestDSASignAndVerifyWithOpenSSL(t *testing.T) { + content := []byte("Hello World") + // write the content to a temp file + tmpContentFile, err := ioutil.TempFile("", "TestDSASignAndVerifyWithOpenSSL_content") + if err != nil { + t.Fatal(err) + } + ioutil.WriteFile(tmpContentFile.Name(), content, 0755) + + block, _ := pem.Decode([]byte(dsaPublicCert)) + if block == nil { + t.Fatal("failed to parse certificate PEM") + } + signerCert, err := x509.ParseCertificate(block.Bytes) + if err != nil { + t.Fatal("failed to parse certificate: " + err.Error()) + } + + // write the signer cert to a temp file + tmpSignerCertFile, err := ioutil.TempFile("", "TestDSASignAndVerifyWithOpenSSL_signer") + if err != nil { + t.Fatal(err) + } + ioutil.WriteFile(tmpSignerCertFile.Name(), dsaPublicCert, 0755) + + priv := dsa.PrivateKey{ + PublicKey: dsa.PublicKey{Parameters: dsa.Parameters{P: fromHex("fd7f53811d75122952df4a9c2eece4e7f611b7523cef4400c31e3f80b6512669455d402251fb593d8d58fabfc5f5ba30f6cb9b556cd7813b801d346ff26660b76b9950a5a49f9fe8047b1022c24fbba9d7feb7c61bf83b57e7c6a8a6150f04fb83f6d3c51ec3023554135a169132f675f3ae2b61d72aeff22203199dd14801c7"), + Q: fromHex("9760508F15230BCCB292B982A2EB840BF0581CF5"), + G: fromHex("F7E1A085D69B3DDECBBCAB5C36B857B97994AFBBFA3AEA82F9574C0B3D0782675159578EBAD4594FE67107108180B449167123E84C281613B7CF09328CC8A6E13C167A8B547C8D28E0A3AE1E2BB3A675916EA37F0BFA213562F1FB627A01243BCCA4F1BEA8519089A883DFE15AE59F06928B665E807B552564014C3BFECF492A"), + }, + }, + X: fromHex("7D6E1A3DD4019FD809669D8AB8DA73807CEF7EC1"), + } + toBeSigned, err := NewSignedData(content) + if err != nil { + t.Fatalf("test case: cannot initialize signed data: %s", err) + } + if err := toBeSigned.SignWithoutAttr(signerCert, &priv, SignerInfoConfig{}); err != nil { + t.Fatalf("Cannot add signer: %s", err) + } + toBeSigned.Detach() + signed, err := toBeSigned.Finish() + if err != nil { + t.Fatalf("test case: cannot finish signing data: %s", err) + } + + // write the signature to a temp file + tmpSignatureFile, err := ioutil.TempFile("", "TestDSASignAndVerifyWithOpenSSL_signature") + if err != nil { + t.Fatal(err) + } + ioutil.WriteFile(tmpSignatureFile.Name(), pem.EncodeToMemory(&pem.Block{Type: "PKCS7", Bytes: signed}), 0755) + + // call openssl to verify the signature on the content using the root + opensslCMD := exec.Command("openssl", "smime", "-verify", "-noverify", + "-in", tmpSignatureFile.Name(), "-inform", "PEM", + "-content", tmpContentFile.Name()) + out, err := opensslCMD.CombinedOutput() + if err != nil { + t.Fatalf("test case: openssl command failed with %s: %s", err, out) + } + os.Remove(tmpSignatureFile.Name()) // clean up + os.Remove(tmpContentFile.Name()) // clean up + os.Remove(tmpSignerCertFile.Name()) // clean up +} + +func ExampleSignedData() { + // generate a signing cert or load a key pair + cert, err := createTestCertificate(x509.SHA256WithRSA) + if err != nil { + fmt.Printf("Cannot create test certificates: %s", err) + } + + // Initialize a SignedData struct with content to be signed + signedData, err := NewSignedData([]byte("Example data to be signed")) + if err != nil { + fmt.Printf("Cannot initialize signed data: %s", err) + } + + // Add the signing cert and private key + if err := signedData.AddSigner(cert.Certificate, cert.PrivateKey, SignerInfoConfig{}); err != nil { + fmt.Printf("Cannot add signer: %s", err) + } + + // Call Detach() is you want to remove content from the signature + // and generate an S/MIME detached signature + signedData.Detach() + + // Finish() to obtain the signature bytes + detachedSignature, err := signedData.Finish() + if err != nil { + fmt.Printf("Cannot finish signing data: %s", err) + } + pem.Encode(os.Stdout, &pem.Block{Type: "PKCS7", Bytes: detachedSignature}) +} + +func TestUnmarshalSignedAttribute(t *testing.T) { + cert, err := createTestCertificate(x509.SHA512WithRSA) + if err != nil { + t.Fatal(err) + } + content := []byte("Hello World") + toBeSigned, err := NewSignedData(content) + if err != nil { + t.Fatalf("Cannot initialize signed data: %s", err) + } + oidTest := asn1.ObjectIdentifier{2, 3, 4, 5, 6, 7} + testValue := "TestValue" + if err := toBeSigned.AddSigner(cert.Certificate, *cert.PrivateKey, SignerInfoConfig{ + ExtraSignedAttributes: []Attribute{Attribute{Type: oidTest, Value: testValue}}, + }); err != nil { + t.Fatalf("Cannot add signer: %s", err) + } + signed, err := toBeSigned.Finish() + if err != nil { + t.Fatalf("Cannot finish signing data: %s", err) + } + p7, err := Parse(signed) + if err != nil { + t.Fatalf("Cannot parse signed data: %v", err) + } + var actual string + err = p7.UnmarshalSignedAttribute(oidTest, &actual) + if err != nil { + t.Fatalf("Cannot unmarshal test value: %s", err) + } + if testValue != actual { + t.Errorf("Attribute does not match test value\n\tExpected: %s\n\tActual: %s", testValue, actual) + } +} + +func TestDegenerateCertificate(t *testing.T) { + cert, err := createTestCertificate(x509.SHA1WithRSA) + if err != nil { + t.Fatal(err) + } + deg, err := DegenerateCertificate(cert.Certificate.Raw) + if err != nil { + t.Fatal(err) + } + testOpenSSLParse(t, deg) + pem.Encode(os.Stdout, &pem.Block{Type: "PKCS7", Bytes: deg}) +} + +// writes the cert to a temporary file and tests that openssl can read it. +func testOpenSSLParse(t *testing.T, certBytes []byte) { + tmpCertFile, err := ioutil.TempFile("", "testCertificate") + if err != nil { + t.Fatal(err) + } + defer os.Remove(tmpCertFile.Name()) // clean up + + if _, err := tmpCertFile.Write(certBytes); err != nil { + t.Fatal(err) + } + + opensslCMD := exec.Command("openssl", "pkcs7", "-inform", "der", "-in", tmpCertFile.Name()) + _, err = opensslCMD.Output() + if err != nil { + t.Fatal(err) + } + + if err := tmpCertFile.Close(); err != nil { + t.Fatal(err) + } + +} +func fromHex(s string) *big.Int { + result, ok := new(big.Int).SetString(s, 16) + if !ok { + panic(s) + } + return result +} diff --git a/scep/pkcs7/verify.go b/scep/pkcs7/verify.go new file mode 100644 index 00000000..c8ead236 --- /dev/null +++ b/scep/pkcs7/verify.go @@ -0,0 +1,264 @@ +package pkcs7 + +import ( + "crypto/subtle" + "crypto/x509" + "crypto/x509/pkix" + "encoding/asn1" + "errors" + "fmt" + "time" +) + +// Verify is a wrapper around VerifyWithChain() that initializes an empty +// trust store, effectively disabling certificate verification when validating +// a signature. +func (p7 *PKCS7) Verify() (err error) { + return p7.VerifyWithChain(nil) +} + +// VerifyWithChain checks the signatures of a PKCS7 object. +// If truststore is not nil, it also verifies the chain of trust of the end-entity +// signer cert to one of the root in the truststore. +func (p7 *PKCS7) VerifyWithChain(truststore *x509.CertPool) (err error) { + if len(p7.Signers) == 0 { + return errors.New("pkcs7: Message has no signers") + } + for _, signer := range p7.Signers { + if err := verifySignature(p7, signer, truststore); err != nil { + return err + } + } + return nil +} + +func verifySignature(p7 *PKCS7, signer signerInfo, truststore *x509.CertPool) (err error) { + signedData := p7.Content + ee := getCertFromCertsByIssuerAndSerial(p7.Certificates, signer.IssuerAndSerialNumber) + if ee == nil { + return errors.New("pkcs7: No certificate for signer") + } + signingTime := time.Now().UTC() + if len(signer.AuthenticatedAttributes) > 0 { + // TODO(fullsailor): First check the content type match + var digest []byte + err := unmarshalAttribute(signer.AuthenticatedAttributes, OIDAttributeMessageDigest, &digest) + if err != nil { + return err + } + hash, err := getHashForOID(signer.DigestAlgorithm.Algorithm) + if err != nil { + return err + } + h := hash.New() + h.Write(p7.Content) + computed := h.Sum(nil) + if subtle.ConstantTimeCompare(digest, computed) != 1 { + return &MessageDigestMismatchError{ + ExpectedDigest: digest, + ActualDigest: computed, + } + } + signedData, err = marshalAttributes(signer.AuthenticatedAttributes) + if err != nil { + return err + } + err = unmarshalAttribute(signer.AuthenticatedAttributes, OIDAttributeSigningTime, &signingTime) + if err == nil { + // signing time found, performing validity check + if signingTime.After(ee.NotAfter) || signingTime.Before(ee.NotBefore) { + return fmt.Errorf("pkcs7: signing time %q is outside of certificate validity %q to %q", + signingTime.Format(time.RFC3339), + ee.NotBefore.Format(time.RFC3339), + ee.NotBefore.Format(time.RFC3339)) + } + } + } + if truststore != nil { + _, err = verifyCertChain(ee, p7.Certificates, truststore, signingTime) + if err != nil { + return err + } + } + sigalg, err := getSignatureAlgorithm(signer.DigestEncryptionAlgorithm, signer.DigestAlgorithm) + if err != nil { + return err + } + return ee.CheckSignature(sigalg, signedData, signer.EncryptedDigest) +} + +// GetOnlySigner returns an x509.Certificate for the first signer of the signed +// data payload. If there are more or less than one signer, nil is returned +func (p7 *PKCS7) GetOnlySigner() *x509.Certificate { + if len(p7.Signers) != 1 { + return nil + } + signer := p7.Signers[0] + return getCertFromCertsByIssuerAndSerial(p7.Certificates, signer.IssuerAndSerialNumber) +} + +// UnmarshalSignedAttribute decodes a single attribute from the signer info +func (p7 *PKCS7) UnmarshalSignedAttribute(attributeType asn1.ObjectIdentifier, out interface{}) error { + sd, ok := p7.raw.(signedData) + if !ok { + return errors.New("pkcs7: payload is not signedData content") + } + if len(sd.SignerInfos) < 1 { + return errors.New("pkcs7: payload has no signers") + } + attributes := sd.SignerInfos[0].AuthenticatedAttributes + return unmarshalAttribute(attributes, attributeType, out) +} + +func parseSignedData(data []byte) (*PKCS7, error) { + var sd signedData + asn1.Unmarshal(data, &sd) + certs, err := sd.Certificates.Parse() + if err != nil { + return nil, err + } + // fmt.Printf("--> Signed Data Version %d\n", sd.Version) + + var compound asn1.RawValue + var content unsignedData + + // The Content.Bytes maybe empty on PKI responses. + if len(sd.ContentInfo.Content.Bytes) > 0 { + if _, err := asn1.Unmarshal(sd.ContentInfo.Content.Bytes, &compound); err != nil { + return nil, err + } + } + // Compound octet string + if compound.IsCompound { + if compound.Tag == 4 { + if _, err = asn1.Unmarshal(compound.Bytes, &content); err != nil { + return nil, err + } + } else { + content = compound.Bytes + } + } else { + // assuming this is tag 04 + content = compound.Bytes + } + return &PKCS7{ + Content: content, + Certificates: certs, + CRLs: sd.CRLs, + Signers: sd.SignerInfos, + raw: sd}, nil +} + +// verifyCertChain takes an end-entity certs, a list of potential intermediates and a +// truststore, and built all potential chains between the EE and a trusted root. +// +// When verifying chains that may have expired, currentTime can be set to a past date +// to allow the verification to pass. If unset, currentTime is set to the current UTC time. +func verifyCertChain(ee *x509.Certificate, certs []*x509.Certificate, truststore *x509.CertPool, currentTime time.Time) (chains [][]*x509.Certificate, err error) { + intermediates := x509.NewCertPool() + for _, intermediate := range certs { + intermediates.AddCert(intermediate) + } + verifyOptions := x509.VerifyOptions{ + Roots: truststore, + Intermediates: intermediates, + KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageAny}, + CurrentTime: currentTime, + } + chains, err = ee.Verify(verifyOptions) + if err != nil { + return chains, fmt.Errorf("pkcs7: failed to verify certificate chain: %v", err) + } + return +} + +// MessageDigestMismatchError is returned when the signer data digest does not +// match the computed digest for the contained content +type MessageDigestMismatchError struct { + ExpectedDigest []byte + ActualDigest []byte +} + +func (err *MessageDigestMismatchError) Error() string { + return fmt.Sprintf("pkcs7: Message digest mismatch\n\tExpected: %X\n\tActual : %X", err.ExpectedDigest, err.ActualDigest) +} + +func getSignatureAlgorithm(digestEncryption, digest pkix.AlgorithmIdentifier) (x509.SignatureAlgorithm, error) { + switch { + case digestEncryption.Algorithm.Equal(OIDDigestAlgorithmECDSASHA1): + return x509.ECDSAWithSHA1, nil + case digestEncryption.Algorithm.Equal(OIDDigestAlgorithmECDSASHA256): + return x509.ECDSAWithSHA256, nil + case digestEncryption.Algorithm.Equal(OIDDigestAlgorithmECDSASHA384): + return x509.ECDSAWithSHA384, nil + case digestEncryption.Algorithm.Equal(OIDDigestAlgorithmECDSASHA512): + return x509.ECDSAWithSHA512, nil + case digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmRSA), + digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmRSASHA1), + digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmRSASHA256), + digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmRSASHA384), + digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmRSASHA512): + switch { + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA1): + return x509.SHA1WithRSA, nil + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA256): + return x509.SHA256WithRSA, nil + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA384): + return x509.SHA384WithRSA, nil + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA512): + return x509.SHA512WithRSA, nil + default: + return -1, fmt.Errorf("pkcs7: unsupported digest %q for encryption algorithm %q", + digest.Algorithm.String(), digestEncryption.Algorithm.String()) + } + case digestEncryption.Algorithm.Equal(OIDDigestAlgorithmDSA), + digestEncryption.Algorithm.Equal(OIDDigestAlgorithmDSASHA1): + switch { + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA1): + return x509.DSAWithSHA1, nil + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA256): + return x509.DSAWithSHA256, nil + default: + return -1, fmt.Errorf("pkcs7: unsupported digest %q for encryption algorithm %q", + digest.Algorithm.String(), digestEncryption.Algorithm.String()) + } + case digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmECDSAP256), + digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmECDSAP384), + digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmECDSAP521): + switch { + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA1): + return x509.ECDSAWithSHA1, nil + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA256): + return x509.ECDSAWithSHA256, nil + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA384): + return x509.ECDSAWithSHA384, nil + case digest.Algorithm.Equal(OIDDigestAlgorithmSHA512): + return x509.ECDSAWithSHA512, nil + default: + return -1, fmt.Errorf("pkcs7: unsupported digest %q for encryption algorithm %q", + digest.Algorithm.String(), digestEncryption.Algorithm.String()) + } + default: + return -1, fmt.Errorf("pkcs7: unsupported algorithm %q", + digestEncryption.Algorithm.String()) + } +} + +func getCertFromCertsByIssuerAndSerial(certs []*x509.Certificate, ias issuerAndSerial) *x509.Certificate { + for _, cert := range certs { + if isCertMatchForIssuerAndSerial(cert, ias) { + return cert + } + } + return nil +} + +func unmarshalAttribute(attrs []attribute, attributeType asn1.ObjectIdentifier, out interface{}) error { + for _, attr := range attrs { + if attr.Type.Equal(attributeType) { + _, err := asn1.Unmarshal(attr.Value.Bytes, out) + return err + } + } + return errors.New("pkcs7: attribute type not in attributes") +} diff --git a/scep/pkcs7/verify_test.go b/scep/pkcs7/verify_test.go new file mode 100644 index 00000000..f80943b2 --- /dev/null +++ b/scep/pkcs7/verify_test.go @@ -0,0 +1,713 @@ +package pkcs7 + +import ( + "bytes" + "crypto/ecdsa" + "crypto/rsa" + "crypto/x509" + "encoding/base64" + "encoding/pem" + "fmt" + "io/ioutil" + "os" + "os/exec" + "testing" + "time" +) + +func TestVerify(t *testing.T) { + fixture := UnmarshalTestFixture(SignedTestFixture) + p7, err := Parse(fixture.Input) + if err != nil { + t.Errorf("Parse encountered unexpected error: %v", err) + } + + if err := p7.Verify(); err != nil { + t.Errorf("Verify failed with error: %v", err) + } + expected := []byte("We the People") + if !bytes.Equal(p7.Content, expected) { + t.Errorf("Signed content does not match.\n\tExpected:%s\n\tActual:%s", expected, p7.Content) + + } +} + +var SignedTestFixture = ` +-----BEGIN PKCS7----- +MIIDVgYJKoZIhvcNAQcCoIIDRzCCA0MCAQExCTAHBgUrDgMCGjAcBgkqhkiG9w0B +BwGgDwQNV2UgdGhlIFBlb3BsZaCCAdkwggHVMIIBQKADAgECAgRpuDctMAsGCSqG +SIb3DQEBCzApMRAwDgYDVQQKEwdBY21lIENvMRUwEwYDVQQDEwxFZGRhcmQgU3Rh +cmswHhcNMTUwNTA2MDQyNDQ4WhcNMTYwNTA2MDQyNDQ4WjAlMRAwDgYDVQQKEwdB +Y21lIENvMREwDwYDVQQDEwhKb24gU25vdzCBnzANBgkqhkiG9w0BAQEFAAOBjQAw +gYkCgYEAqr+tTF4mZP5rMwlXp1y+crRtFpuLXF1zvBZiYMfIvAHwo1ta8E1IcyEP +J1jIiKMcwbzeo6kAmZzIJRCTezq9jwXUsKbQTvcfOH9HmjUmXBRWFXZYoQs/OaaF +a45deHmwEeMQkuSWEtYiVKKZXtJOtflKIT3MryJEDiiItMkdybUCAwEAAaMSMBAw +DgYDVR0PAQH/BAQDAgCgMAsGCSqGSIb3DQEBCwOBgQDK1EweZWRL+f7Z+J0kVzY8 +zXptcBaV4Lf5wGZJLJVUgp33bpLNpT3yadS++XQJ+cvtW3wADQzBSTMduyOF8Zf+ +L7TjjrQ2+F2HbNbKUhBQKudxTfv9dJHdKbD+ngCCdQJYkIy2YexsoNG0C8nQkggy +axZd/J69xDVx6pui3Sj8sDGCATYwggEyAgEBMDEwKTEQMA4GA1UEChMHQWNtZSBD +bzEVMBMGA1UEAxMMRWRkYXJkIFN0YXJrAgRpuDctMAcGBSsOAwIaoGEwGAYJKoZI +hvcNAQkDMQsGCSqGSIb3DQEHATAgBgkqhkiG9w0BCQUxExcRMTUwNTA2MDAyNDQ4 +LTA0MDAwIwYJKoZIhvcNAQkEMRYEFG9D7gcTh9zfKiYNJ1lgB0yTh4sZMAsGCSqG +SIb3DQEBAQSBgFF3sGDU9PtXty/QMtpcFa35vvIOqmWQAIZt93XAskQOnBq4OloX +iL9Ct7t1m4pzjRm0o9nDkbaSLZe7HKASHdCqijroScGlI8M+alJ8drHSFv6ZIjnM +FIwIf0B2Lko6nh9/6mUXq7tbbIHa3Gd1JUVire/QFFtmgRXMbXYk8SIS +-----END PKCS7----- +-----BEGIN CERTIFICATE----- +MIIB1TCCAUCgAwIBAgIEabg3LTALBgkqhkiG9w0BAQswKTEQMA4GA1UEChMHQWNt +ZSBDbzEVMBMGA1UEAxMMRWRkYXJkIFN0YXJrMB4XDTE1MDUwNjA0MjQ0OFoXDTE2 +MDUwNjA0MjQ0OFowJTEQMA4GA1UEChMHQWNtZSBDbzERMA8GA1UEAxMISm9uIFNu +b3cwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAKq/rUxeJmT+azMJV6dcvnK0 +bRabi1xdc7wWYmDHyLwB8KNbWvBNSHMhDydYyIijHMG83qOpAJmcyCUQk3s6vY8F +1LCm0E73Hzh/R5o1JlwUVhV2WKELPzmmhWuOXXh5sBHjEJLklhLWIlSimV7STrX5 +SiE9zK8iRA4oiLTJHcm1AgMBAAGjEjAQMA4GA1UdDwEB/wQEAwIAoDALBgkqhkiG +9w0BAQsDgYEAytRMHmVkS/n+2fidJFc2PM16bXAWleC3+cBmSSyVVIKd926SzaU9 +8mnUvvl0CfnL7Vt8AA0MwUkzHbsjhfGX/i+04460Nvhdh2zWylIQUCrncU37/XSR +3Smw/p4AgnUCWJCMtmHsbKDRtAvJ0JIIMmsWXfyevcQ1ceqbot0o/LA= +-----END CERTIFICATE----- +-----BEGIN PRIVATE KEY----- +MIICXgIBAAKBgQCqv61MXiZk/mszCVenXL5ytG0Wm4tcXXO8FmJgx8i8AfCjW1rw +TUhzIQ8nWMiIoxzBvN6jqQCZnMglEJN7Or2PBdSwptBO9x84f0eaNSZcFFYVdlih +Cz85poVrjl14ebAR4xCS5JYS1iJUople0k61+UohPcyvIkQOKIi0yR3JtQIDAQAB +AoGBAIPLCR9N+IKxodq11lNXEaUFwMHXc1zqwP8no+2hpz3+nVfplqqubEJ4/PJY +5AgbJoIfnxVhyBXJXu7E+aD/OPneKZrgp58YvHKgGvvPyJg2gpC/1Fh0vQB0HNpI +1ZzIZUl8ZTUtVgtnCBUOh5JGI4bFokAqrT//Uvcfd+idgxqBAkEA1ZbP/Kseld14 +qbWmgmU5GCVxsZRxgR1j4lG3UVjH36KXMtRTm1atAam1uw3OEGa6Y3ANjpU52FaB +Hep5rkk4FQJBAMynMo1L1uiN5GP+KYLEF5kKRxK+FLjXR0ywnMh+gpGcZDcOae+J ++t1gLoWBIESH/Xt639T7smuSfrZSA9V0EyECQA8cvZiWDvLxmaEAXkipmtGPjKzQ +4PsOtkuEFqFl07aKDYKmLUg3aMROWrJidqsIabWxbvQgsNgSvs38EiH3wkUCQQCg +ndxb7piVXb9RBwm3OoU2tE1BlXMX+sVXmAkEhd2dwDsaxrI3sHf1xGXem5AimQRF +JBOFyaCnMotGNioSHY5hAkEAxyXcNixQ2RpLXJTQZtwnbk0XDcbgB+fBgXnv/4f3 +BCvcu85DqJeJyQv44Oe1qsXEX9BfcQIOVaoep35RPlKi9g== +-----END PRIVATE KEY-----` + +func TestVerifyEC2(t *testing.T) { + fixture := UnmarshalTestFixture(EC2IdentityDocumentFixture) + p7, err := Parse(fixture.Input) + if err != nil { + t.Errorf("Parse encountered unexpected error: %v", err) + } + p7.Certificates = []*x509.Certificate{fixture.Certificate} + if err := p7.Verify(); err != nil { + t.Errorf("Verify failed with error: %v", err) + } +} + +var EC2IdentityDocumentFixture = ` +-----BEGIN PKCS7----- +MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAaCA +JIAEggGmewogICJwcml2YXRlSXAiIDogIjE3Mi4zMC4wLjI1MiIsCiAgImRldnBh +eVByb2R1Y3RDb2RlcyIgOiBudWxsLAogICJhdmFpbGFiaWxpdHlab25lIiA6ICJ1 +cy1lYXN0LTFhIiwKICAidmVyc2lvbiIgOiAiMjAxMC0wOC0zMSIsCiAgImluc3Rh +bmNlSWQiIDogImktZjc5ZmU1NmMiLAogICJiaWxsaW5nUHJvZHVjdHMiIDogbnVs +bCwKICAiaW5zdGFuY2VUeXBlIiA6ICJ0Mi5taWNybyIsCiAgImFjY291bnRJZCIg +OiAiMTIxNjU5MDE0MzM0IiwKICAiaW1hZ2VJZCIgOiAiYW1pLWZjZTNjNjk2IiwK +ICAicGVuZGluZ1RpbWUiIDogIjIwMTYtMDQtMDhUMDM6MDE6MzhaIiwKICAiYXJj +aGl0ZWN0dXJlIiA6ICJ4ODZfNjQiLAogICJrZXJuZWxJZCIgOiBudWxsLAogICJy +YW1kaXNrSWQiIDogbnVsbCwKICAicmVnaW9uIiA6ICJ1cy1lYXN0LTEiCn0AAAAA +AAAxggEYMIIBFAIBATBpMFwxCzAJBgNVBAYTAlVTMRkwFwYDVQQIExBXYXNoaW5n +dG9uIFN0YXRlMRAwDgYDVQQHEwdTZWF0dGxlMSAwHgYDVQQKExdBbWF6b24gV2Vi +IFNlcnZpY2VzIExMQwIJAJa6SNnlXhpnMAkGBSsOAwIaBQCgXTAYBgkqhkiG9w0B +CQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNjA0MDgwMzAxNDRaMCMG +CSqGSIb3DQEJBDEWBBTuUc28eBXmImAautC+wOjqcFCBVjAJBgcqhkjOOAQDBC8w +LQIVAKA54NxGHWWCz5InboDmY/GHs33nAhQ6O/ZI86NwjA9Vz3RNMUJrUPU5tAAA +AAAAAA== +-----END PKCS7----- +-----BEGIN CERTIFICATE----- +MIIC7TCCAq0CCQCWukjZ5V4aZzAJBgcqhkjOOAQDMFwxCzAJBgNVBAYTAlVTMRkw +FwYDVQQIExBXYXNoaW5ndG9uIFN0YXRlMRAwDgYDVQQHEwdTZWF0dGxlMSAwHgYD +VQQKExdBbWF6b24gV2ViIFNlcnZpY2VzIExMQzAeFw0xMjAxMDUxMjU2MTJaFw0z +ODAxMDUxMjU2MTJaMFwxCzAJBgNVBAYTAlVTMRkwFwYDVQQIExBXYXNoaW5ndG9u +IFN0YXRlMRAwDgYDVQQHEwdTZWF0dGxlMSAwHgYDVQQKExdBbWF6b24gV2ViIFNl +cnZpY2VzIExMQzCCAbcwggEsBgcqhkjOOAQBMIIBHwKBgQCjkvcS2bb1VQ4yt/5e +ih5OO6kK/n1Lzllr7D8ZwtQP8fOEpp5E2ng+D6Ud1Z1gYipr58Kj3nssSNpI6bX3 +VyIQzK7wLclnd/YozqNNmgIyZecN7EglK9ITHJLP+x8FtUpt3QbyYXJdmVMegN6P +hviYt5JH/nYl4hh3Pa1HJdskgQIVALVJ3ER11+Ko4tP6nwvHwh6+ERYRAoGBAI1j +k+tkqMVHuAFcvAGKocTgsjJem6/5qomzJuKDmbJNu9Qxw3rAotXau8Qe+MBcJl/U +hhy1KHVpCGl9fueQ2s6IL0CaO/buycU1CiYQk40KNHCcHfNiZbdlx1E9rpUp7bnF +lRa2v1ntMX3caRVDdbtPEWmdxSCYsYFDk4mZrOLBA4GEAAKBgEbmeve5f8LIE/Gf +MNmP9CM5eovQOGx5ho8WqD+aTebs+k2tn92BBPqeZqpWRa5P/+jrdKml1qx4llHW +MXrs3IgIb6+hUIB+S8dz8/mmO0bpr76RoZVCXYab2CZedFut7qc3WUH9+EUAH5mw +vSeDCOUMYQR7R9LINYwouHIziqQYMAkGByqGSM44BAMDLwAwLAIUWXBlk40xTwSw +7HX32MxXYruse9ACFBNGmdX2ZBrVNGrN9N2f6ROk0k9K +-----END CERTIFICATE-----` + +func TestVerifyAppStore(t *testing.T) { + fixture := UnmarshalTestFixture(AppStoreReceiptFixture) + p7, err := Parse(fixture.Input) + if err != nil { + t.Errorf("Parse encountered unexpected error: %v", err) + } + if err := p7.Verify(); err != nil { + t.Errorf("Verify failed with error: %v", err) + } +} + +var AppStoreReceiptFixture = ` +-----BEGIN PKCS7----- +MIITtgYJKoZIhvcNAQcCoIITpzCCE6MCAQExCzAJBgUrDgMCGgUAMIIDVwYJKoZI +hvcNAQcBoIIDSASCA0QxggNAMAoCAQgCAQEEAhYAMAoCARQCAQEEAgwAMAsCAQEC +AQEEAwIBADALAgEDAgEBBAMMATEwCwIBCwIBAQQDAgEAMAsCAQ8CAQEEAwIBADAL +AgEQAgEBBAMCAQAwCwIBGQIBAQQDAgEDMAwCAQoCAQEEBBYCNCswDAIBDgIBAQQE +AgIAjTANAgENAgEBBAUCAwFgvTANAgETAgEBBAUMAzEuMDAOAgEJAgEBBAYCBFAy +NDcwGAIBAgIBAQQQDA5jb20uemhpaHUudGVzdDAYAgEEAgECBBCS+ZODNMHwT1Nz +gWYDXyWZMBsCAQACAQEEEwwRUHJvZHVjdGlvblNhbmRib3gwHAIBBQIBAQQU4nRh +YCEZx70Flzv7hvJRjJZckYIwHgIBDAIBAQQWFhQyMDE2LTA3LTIzVDA2OjIxOjEx +WjAeAgESAgEBBBYWFDIwMTMtMDgtMDFUMDc6MDA6MDBaMD0CAQYCAQEENbR21I+a +8+byMXo3NPRoDWQmSXQF2EcCeBoD4GaL//ZCRETp9rGFPSg1KekCP7Kr9HAqw09m +MEICAQcCAQEEOlVJozYYBdugybShbiiMsejDMNeCbZq6CrzGBwW6GBy+DGWxJI91 +Y3ouXN4TZUhuVvLvN1b0m5T3ggQwggFaAgERAgEBBIIBUDGCAUwwCwICBqwCAQEE +AhYAMAsCAgatAgEBBAIMADALAgIGsAIBAQQCFgAwCwICBrICAQEEAgwAMAsCAgaz +AgEBBAIMADALAgIGtAIBAQQCDAAwCwICBrUCAQEEAgwAMAsCAga2AgEBBAIMADAM +AgIGpQIBAQQDAgEBMAwCAgarAgEBBAMCAQEwDAICBq4CAQEEAwIBADAMAgIGrwIB +AQQDAgEAMAwCAgaxAgEBBAMCAQAwGwICBqcCAQEEEgwQMTAwMDAwMDIyNTMyNTkw +MTAbAgIGqQIBAQQSDBAxMDAwMDAwMjI1MzI1OTAxMB8CAgaoAgEBBBYWFDIwMTYt +MDctMjNUMDY6MjE6MTFaMB8CAgaqAgEBBBYWFDIwMTYtMDctMjNUMDY6MjE6MTFa +MCACAgamAgEBBBcMFWNvbS56aGlodS50ZXN0LnRlc3RfMaCCDmUwggV8MIIEZKAD +AgECAggO61eH554JjTANBgkqhkiG9w0BAQUFADCBljELMAkGA1UEBhMCVVMxEzAR +BgNVBAoMCkFwcGxlIEluYy4xLDAqBgNVBAsMI0FwcGxlIFdvcmxkd2lkZSBEZXZl +bG9wZXIgUmVsYXRpb25zMUQwQgYDVQQDDDtBcHBsZSBXb3JsZHdpZGUgRGV2ZWxv +cGVyIFJlbGF0aW9ucyBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTAeFw0xNTExMTMw +MjE1MDlaFw0yMzAyMDcyMTQ4NDdaMIGJMTcwNQYDVQQDDC5NYWMgQXBwIFN0b3Jl +IGFuZCBpVHVuZXMgU3RvcmUgUmVjZWlwdCBTaWduaW5nMSwwKgYDVQQLDCNBcHBs +ZSBXb3JsZHdpZGUgRGV2ZWxvcGVyIFJlbGF0aW9uczETMBEGA1UECgwKQXBwbGUg 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+thqBs1JlbGlhbmNlIG9uIHRoaXMgY2VydGlmaWNhdGUgYnkgYW55IHBhcnR5IGFz +c3VtZXMgYWNjZXB0YW5jZSBvZiB0aGUgdGhlbiBhcHBsaWNhYmxlIHN0YW5kYXJk +IHRlcm1zIGFuZCBjb25kaXRpb25zIG9mIHVzZSwgY2VydGlmaWNhdGUgcG9saWN5 +IGFuZCBjZXJ0aWZpY2F0aW9uIHByYWN0aWNlIHN0YXRlbWVudHMuMA0GCSqGSIb3 +DQEBBQUAA4IBAQBcNplMLXi37Yyb3PN3m/J20ncwT8EfhYOFG5k9RzfyqZtAjizU +sZAS2L70c5vu0mQPy3lPNNiiPvl4/2vIB+x9OYOLUyDTOMSxv5pPCmv/K/xZpwUJ +fBdAVhEedNO3iyM7R6PVbyTi69G3cN8PReEnyvFteO3ntRcXqNx+IjXKJdXZD9Zr +1KIkIxH3oayPc4FgxhtbCS+SsvhESPBgOJ4V9T0mZyCKM2r3DYLP3uujL/lTaltk +wGMzd/c6ByxW69oPIQ7aunMZT7XZNn/Bh1XZp5m5MkL72NVxnn6hUrcbvZNCJBIq +xw8dtk2cXmPIS4AXUKqK1drk/NAJBzewdXUhMYIByzCCAccCAQEwgaMwgZYxCzAJ +BgNVBAYTAlVTMRMwEQYDVQQKDApBcHBsZSBJbmMuMSwwKgYDVQQLDCNBcHBsZSBX +b3JsZHdpZGUgRGV2ZWxvcGVyIFJlbGF0aW9uczFEMEIGA1UEAww7QXBwbGUgV29y +bGR3aWRlIERldmVsb3BlciBSZWxhdGlvbnMgQ2VydGlmaWNhdGlvbiBBdXRob3Jp +dHkCCA7rV4fnngmNMAkGBSsOAwIaBQAwDQYJKoZIhvcNAQEBBQAEggEAasPtnide +NWyfUtewW9OSgcQA8pW+5tWMR0469cBPZR84uJa0gyfmPspySvbNOAwnrwzZHYLa +ujOxZLip4DUw4F5s3QwUa3y4BXpF4J+NSn9XNvxNtnT/GcEQtCuFwgJ0o3F0ilhv +MTHrwiwyx/vr+uNDqlORK8lfK+1qNp+A/kzh8eszMrn4JSeTh9ZYxLHE56WkTQGD +VZXl0gKgxSOmDrcp1eQxdlymzrPv9U60wUJ0bkPfrU9qZj3mJrmrkQk61JTe3j6/ +QfjfFBG9JG2mUmYQP1KQ3SypGHzDW8vngvsGu//tNU0NFfOqQu4bYU4VpQl0nPtD +4B85NkrgvQsWAQ== +-----END PKCS7-----` + +func TestVerifyApkEcdsa(t *testing.T) { + fixture := UnmarshalTestFixture(ApkEcdsaFixture) + p7, err := Parse(fixture.Input) + if err != nil { + t.Errorf("Parse encountered unexpected error: %v", err) + } + p7.Content, err = base64.StdEncoding.DecodeString(ApkEcdsaContent) + if err != nil { + t.Errorf("Failed to decode base64 signature file: %v", err) + } + if err := p7.Verify(); err != nil { + t.Errorf("Verify failed with error: %v", err) + } +} + +var ApkEcdsaFixture = `-----BEGIN PKCS7----- +MIIDAgYJKoZIhvcNAQcCoIIC8zCCAu8CAQExDzANBglghkgBZQMEAgMFADALBgkq +hkiG9w0BBwGgggH3MIIB8zCCAVSgAwIBAgIJAOxXdFsvm3YiMAoGCCqGSM49BAME +MBIxEDAOBgNVBAMMB2VjLXA1MjEwHhcNMTYwMzMxMTUzMTIyWhcNNDMwODE3MTUz +MTIyWjASMRAwDgYDVQQDDAdlYy1wNTIxMIGbMBAGByqGSM49AgEGBSuBBAAjA4GG +AAQAYX95sSjPEQqgyLD04tNUyq9y/w8seblOpfqa/Amx6H4GFdrjGXX0YTfXKr9G +hAyIyQSnNrIg0zDlWQUbBPRW4CYBLFOg1pUn1NBhKFD4NtO1KWvYtNOYDegFjRCP +B0p+fEXDbq8QFDYvlh+NZUJ16+ih8XNIf1C29xuLEqN6oKOnAvajUDBOMB0GA1Ud +DgQWBBT/Ra3kz60gQ7tYk3byZckcLabt8TAfBgNVHSMEGDAWgBT/Ra3kz60gQ7tY +k3byZckcLabt8TAMBgNVHRMEBTADAQH/MAoGCCqGSM49BAMEA4GMADCBiAJCAP39 +hYLsWk2H84oEw+HJqGGjexhqeD3vSO1mWhopripE/81oy3yV10puYoJe11xDSfcD +j2VfNCHazuXO3kSxGA/1AkIBLUJxp/WYbYzhBGKr6lcxczKI/wuMfkZ6vL+0EMJV +A/2uEoeqvnl7BsdkicyaOBNEADijuVdaPPIWzKClt9OaVxExgdAwgc0CAQEwHzAS +MRAwDgYDVQQDDAdlYy1wNTIxAgkA7Fd0Wy+bdiIwDQYJYIZIAWUDBAIDBQAwCgYI +KoZIzj0EAwQEgYswgYgCQgD1pVSNo7qTm9A6tpt3SU2yRa+xpJAnUbpZ+Gu36B71 +JnQBUzRgTGevniqHpyagi7b2zjWh1uvfz9FfrITUwGMddgJCAPjiBRcl7rKpxmZn +V1MvcJOX41xRSJu1wmBiYXqaJarL+gQ/Wl7RYsMtqLjmNColvLaHNxCaWOO/8nAE +Hg0OMA60 +-----END PKCS7-----` + +var ApkEcdsaContent = `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` + +func TestVerifyFirefoxAddon(t *testing.T) { + fixture := UnmarshalTestFixture(FirefoxAddonFixture) + p7, err := Parse(fixture.Input) + if err != nil { + t.Errorf("Parse encountered unexpected error: %v", err) + } + p7.Content = FirefoxAddonContent + certPool := x509.NewCertPool() + certPool.AppendCertsFromPEM(FirefoxAddonRootCert) + if err := p7.VerifyWithChain(certPool); err != nil { + t.Errorf("Verify failed with error: %v", err) + } + // Verify the certificate chain to make sure the identified root + // is the one we expect + ee := getCertFromCertsByIssuerAndSerial(p7.Certificates, p7.Signers[0].IssuerAndSerialNumber) + if ee == nil { + t.Errorf("No end-entity certificate found for signer") + } + signingTime, _ := time.Parse(time.RFC3339, "2017-02-23 09:06:16-05:00") + chains, err := verifyCertChain(ee, p7.Certificates, certPool, signingTime) + if err != nil { + t.Error(err) + } + if len(chains) != 1 { + t.Errorf("Expected to find one chain, but found %d", len(chains)) + } + if len(chains[0]) != 3 { + t.Errorf("Expected to find three certificates in chain, but found %d", len(chains[0])) + } + if chains[0][0].Subject.CommonName != "tabscope@xuldev.org" { + t.Errorf("Expected to find EE certificate with subject 'tabscope@xuldev.org', but found '%s'", chains[0][0].Subject.CommonName) + } + if chains[0][1].Subject.CommonName != "production-signing-ca.addons.mozilla.org" { + t.Errorf("Expected to find intermediate certificate with subject 'production-signing-ca.addons.mozilla.org', but found '%s'", chains[0][1].Subject.CommonName) + } + if chains[0][2].Subject.CommonName != "root-ca-production-amo" { + t.Errorf("Expected to find root certificate with subject 'root-ca-production-amo', but found '%s'", chains[0][2].Subject.CommonName) + } +} + +var FirefoxAddonContent = []byte(`Signature-Version: 1.0 +MD5-Digest-Manifest: KjRavc6/KNpuT1QLcB/Gsg== +SHA1-Digest-Manifest: 5Md5nUg+U7hQ/UfzV+xGKWOruVI= + +`) + +var FirefoxAddonFixture = ` +-----BEGIN PKCS7----- +MIIQTAYJKoZIhvcNAQcCoIIQPTCCEDkCAQExCzAJBgUrDgMCGgUAMAsGCSqGSIb3 +DQEHAaCCDL0wggW6MIIDoqADAgECAgYBVpobWVwwDQYJKoZIhvcNAQELBQAwgcUx +CzAJBgNVBAYTAlVTMRwwGgYDVQQKExNNb3ppbGxhIENvcnBvcmF0aW9uMS8wLQYD +VQQLEyZNb3ppbGxhIEFNTyBQcm9kdWN0aW9uIFNpZ25pbmcgU2VydmljZTExMC8G +A1UEAxMocHJvZHVjdGlvbi1zaWduaW5nLWNhLmFkZG9ucy5tb3ppbGxhLm9yZzE0 +MDIGCSqGSIb3DQEJARYlc2VydmljZXMtb3BzK2FkZG9uc2lnbmluZ0Btb3ppbGxh +LmNvbTAeFw0xNjA4MTcyMDA0NThaFw0yMTA4MTYyMDA0NThaMHYxEzARBgNVBAsT +ClByb2R1Y3Rpb24xCzAJBgNVBAYTAlVTMRYwFAYDVQQHEw1Nb3VudGFpbiBWaWV3 +MQ8wDQYDVQQKEwZBZGRvbnMxCzAJBgNVBAgTAkNBMRwwGgYDVQQDFBN0YWJzY29w +ZUB4dWxkZXYub3JnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAv6e0 +mPD8dt4J8HTNNq4ODns2DV6Weh1hllCIFvOeu1u3UrR03st0BMY8OXYwr/NvRVjg +bA8gRySWAL+XqLzbhtXNeNegAoxrF+3mYY5rJjsLj/FGI6P6OXjngqwgm9VTBl7m +jh/KXBSwYoUcavJo6cmk8sCFwoblyQiv+tsWaUCOI6zMzubNtIS+GFvET9y/VZMP +j6mk8O10wBgJF5MMtA19va3qXy7aCZ7DnZp1l3equd/L6t324TtXoqx6xWQKo6TM +I0mcTlKvm6TKegTGBCyGn3JRARoIJv4AW1qqgyaHXf9EoY2pKT8Avkri5++NuSJ6 +jtO4k/diBA2MZU20U0KGffYZNTxKDqd6XtI6y1tJPd/OWRFyU+mHntkcm9sar7L3 +nPKujHRox2re10ec1WBnJE3PjlAoesNjxzp+xs2mGGc8DX9NuWn+1uK9xmgGIIMl +OFfyQ4s0G6hKp5goFcrFZxmexu0ZahOs8vZf8xDBW7yR1zToQElOXHvrscM386os +kOF9IxQZfcCoPuNQVg1haCONNkx0oau3RQQlOSAZtC79b+rBjQ5JYfjRLYAworf2 +xQaprCh33TD1dTBrvzEbCGszgkN53Vqh5TFBjbU/NyldOkGvK8Xf6WhT5u+aftnV +lbuE2McAg6x1AlloUZq6PNTBpz7zypcIISnQ+y8CAwEAATANBgkqhkiG9w0BAQsF +AAOCAgEAIBoo2+OEYNCgP/IbUj9azaf/lde1q4AK/uTMoUeS5WcrXd8aqA0Y1qV7 +xUALgDQAExXgqcOMGu4mPMaoZDgwGI4Tj7XPJQq5Z5zYxpRf/Wtzae33T9BF6QPW +v5xiRYuol+FbEtqRHZqxDWtIrd1MWBy3wjO3pLPdzDM9jWh+HLxdGWThJszaZp3T +CqsOx+l9W0Q7qM5ioZpHStgXDfhw38Lg++kLnzcX9MqsjYyezdwE4krqW6hK3+4S +0LZE4dTgsy8JULkyAF3HrPWEXESnD7c4mx6owZe+BNDK5hsVM/obAqH7sJq/igbM +5N1l832p/ws8l5xKOr3qBWSzWn6u7ExvqG6Ckh0foJOVXvzGqvrXcoiBGV8S9Z7c +DghUvMt6b0pZ0ildRCHfTUz7eG3g4MhfbjupR7b+L9FWEJhcd/H0dxpw7SKYha/n +ePuRL7MXmbW8WLMqO/ImxzL8TPOB3pUg3nITfubV6gpPBmn+0nwbqYUmggJuwgvK +I2GpN2Ny6EErZy17EEgyhJygJZMj+UzQjC781xxsl3ljpYEqqwgRLIZBSBUD5dXj +XBuU24w162SeSyHZzkBbuv6lr52pqoZyFrG29DCHECgO9ZmNWgSpiWSkh+vExAG7 +wNs0y61t2HUG+BCMGPQ9sOzouyTfrnLVAWwzswGftFYQfoIBeJIwggb7MIIE46AD +AgECAgMQAAIwDQYJKoZIhvcNAQEMBQAwfTELMAkGA1UEBhMCVVMxHDAaBgNVBAoT +E01vemlsbGEgQ29ycG9yYXRpb24xLzAtBgNVBAsTJk1vemlsbGEgQU1PIFByb2R1 +Y3Rpb24gU2lnbmluZyBTZXJ2aWNlMR8wHQYDVQQDExZyb290LWNhLXByb2R1Y3Rp +b24tYW1vMB4XDTE1MDMxNzIzNTI0MloXDTI1MDMxNDIzNTI0MlowgcUxCzAJBgNV +BAYTAlVTMRwwGgYDVQQKExNNb3ppbGxhIENvcnBvcmF0aW9uMS8wLQYDVQQLEyZN +b3ppbGxhIEFNTyBQcm9kdWN0aW9uIFNpZ25pbmcgU2VydmljZTExMC8GA1UEAxMo +cHJvZHVjdGlvbi1zaWduaW5nLWNhLmFkZG9ucy5tb3ppbGxhLm9yZzE0MDIGCSqG +SIb3DQEJARYlc2VydmljZXMtb3BzK2FkZG9uc2lnbmluZ0Btb3ppbGxhLmNvbTCC +AiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAMLMM9m2HBLhCiO9mhljpehT +hxpzlCnxluzDZ51I/H7MvBbIvZBm9zSpHdffubSsak2qYE69d+ebTa/CK83WIosM +24/2Qp7n/GGaPJcCC4Y3JkrCsgA8+wV2MbFlKSv+qMdvI/sE3BPYDMCjVPMhHmIP +XaPWd42OoHpI8R3GGUtVnR3Hm76pa2+v6TwgeMiO8om+ogGufiyv6FNMZ5NuY1Z9 +aLNEvehnAzSfddQyki+6FJd7XkgZbP7pb1Kl8yYgiy4piBerJ9H09uPehffE3Ell +3cApQL3+0kjaUX4scMjuNQDMKziRZkYgJAM+qA9WA5Jn77AjerQBWQeEev1PWHYh +0IDlgS/a0bjKmVjNZYG6adrY/R5/whzWGFCIE1UfhPm6PdN0557qvF838C2RFHsI +KzV6KQf0chMjpa02tPaIctjVhnDQZZNKm2ZfLOt9kQ57Is/e6KxH7pYMit46+s99 +lYM7ZquvWbK19b1Ili/6S1BxSzd3wztgfN5jGsc+jCCYLm+AcVtfNKc8cFZHXKrB +CwhGmdbWDSBCicZNA7FKJpO3oIx26VPF2XUldA/T5Mh/POGLilK3t9m9qbjEyDp1 +EwoBToOR/aMrdnNYvSWp0g/GHMzSfJjjXyAqrZY2itam/IJd8r9FoRAzevPt/zTX +BET3INoiCDGRH0XrxUYtAgMGVTejggE5MIIBNTAMBgNVHRMEBTADAQH/MA4GA1Ud +DwEB/wQEAwIBBjAWBgNVHSUBAf8EDDAKBggrBgEFBQcDAzAdBgNVHQ4EFgQUdHxf +FKXipZLjs20GqIUdNkQXH4gwgagGA1UdIwSBoDCBnYAUs7zqWHSr4W54KrKrnCMe +qGMsl7ehgYGkfzB9MQswCQYDVQQGEwJVUzEcMBoGA1UEChMTTW96aWxsYSBDb3Jw +b3JhdGlvbjEvMC0GA1UECxMmTW96aWxsYSBBTU8gUHJvZHVjdGlvbiBTaWduaW5n +IFNlcnZpY2UxHzAdBgNVBAMTFnJvb3QtY2EtcHJvZHVjdGlvbi1hbW+CAQEwMwYJ +YIZIAYb4QgEEBCYWJGh0dHA6Ly9hZGRvbnMubW96aWxsYS5vcmcvY2EvY3JsLnBl +bTANBgkqhkiG9w0BAQwFAAOCAgEArde/fdjb7TE0eH7Ij7xU4JbcSyhY3cQhVYCw +Fg+Q/2pj+NAfazcjUuLWA0Y/YZs9HOx6j+ZAqO4C/xfMP4RDs9IypxvzHDU6SXgD +RK6uOKtS07HXLcXgFUBvJEQhbT/h5+IQOA4/GcpCshfD6iyiBBi+IocR+tnKPCuZ +T3m1t60Eja/MkPKG/Gx8vSodHvlTTsJ2GzjUEANveCZOnlAdp9fjTvFZny9qqnbg +sfVbuTqKndbCFW5QLXfkna6jBqMrY0+CpMYY2oJ5gwpHbE/7hhukjxGCTcpv7r/O +M53bb/DZnybDlLLepacljvz7DBA1O1FFtEhf9MR+vyvmBpniAyKQhqG2hsVGurE1 +nBcE+oteZWar2lMp6+etDAb9DRC+jZv0aEQs2o/qQwyD8AGquLgBsJq5Jz3gGxzn +4r3vGu2lV8VdzIm0C8sOFSWTmTZxQmJbF8xSsQBojnsvEah4DPER+eAt6qKolaWe +s4drJQjzFyC7HJn2VqalpCwbe9CdMB7eRqzeP6GujJBi80/gx0pAysUtuKKpH5IJ +WbXAOszfrjb3CaHafYZDnwPoOfj74ogFzjt2f54jwnU+ET/byfjZ7J8SLH316C1V +HrvFXcTzyMV4aRluVPjPg9x1G58hMIbeuT4GpwQUNdJ9uL8t65v0XwG2t6Y7jpRO +sFVxBtgxggNXMIIDUwIBATCB0DCBxTELMAkGA1UEBhMCVVMxHDAaBgNVBAoTE01v +emlsbGEgQ29ycG9yYXRpb24xLzAtBgNVBAsTJk1vemlsbGEgQU1PIFByb2R1Y3Rp +b24gU2lnbmluZyBTZXJ2aWNlMTEwLwYDVQQDEyhwcm9kdWN0aW9uLXNpZ25pbmct +Y2EuYWRkb25zLm1vemlsbGEub3JnMTQwMgYJKoZIhvcNAQkBFiVzZXJ2aWNlcy1v +cHMrYWRkb25zaWduaW5nQG1vemlsbGEuY29tAgYBVpobWVwwCQYFKw4DAhoFAKBd +MBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTE2MDgx +NzIwMDQ1OFowIwYJKoZIhvcNAQkEMRYEFAxlGvNFSx+Jqj70haE8b7UZk+2GMA0G +CSqGSIb3DQEBAQUABIICADsDlrucYRgwq9o2QSsO6X6cRa5Zu6w+1n07PTIyc1zn +Pi1cgkkWZ0kZBHDrJ5CY33yRQPl6I1tHXaq7SkOSdOppKhpUmBiKZxQRAZR21QHk +R3v1XS+st/o0N+0btv3YoplUifLIwtH89oolxqlStChELu7FuOBretdhx/z12ytA +EhIIS53o/XjDL7XKJbQA02vzOtOC/Eq6p8BI7F3y6pvtmJIRkeGv+u6ssJa6g5q8 +74w8hHXaH94Z9+hDPqjNWlsXJHgPdAKiEjzDz9oLkvDyX4Pd8JMK5ILskirpG+hj +Q8jkTc5oYwyuSlBAUTGxW6ZbuOrtfVZvOVtRL/ixuiFiVlJ+JOQOxrtK19ukamsI +iacFlbLgiA7w0HCtm2DsT9aL67/1e4rJ0lv0MjnQYUMmKQy7g0Gd3+nQPU9pn+Lf +Z/UmSNWiJ8Csc/seDMyzT6jrzcGPfoSVaUowH0wGrI9If1snwcr+mMg7dWRGf1fm +y/dcVSzed0ax4LqDmike1EshU+51cKWWlnhyNHK4KH+0fNsBQ0c6clrFpGx9MPmV +YXie6C+LWkh5x12RU0sJt/SmSZV6q9VliIkX+yY3jBrC/pKgRahtcIyq46Da1E6K +lc15Euur3NfGow+nott0Z8XutpYdK/2vBKcIh9JOdkd+oe6pcIP6hnhHRp53wqmG +-----END PKCS7-----` + +var FirefoxAddonRootCert = []byte(` +-----BEGIN CERTIFICATE----- +MIIGYTCCBEmgAwIBAgIBATANBgkqhkiG9w0BAQwFADB9MQswCQYDVQQGEwJVUzEc +MBoGA1UEChMTTW96aWxsYSBDb3Jwb3JhdGlvbjEvMC0GA1UECxMmTW96aWxsYSBB +TU8gUHJvZHVjdGlvbiBTaWduaW5nIFNlcnZpY2UxHzAdBgNVBAMTFnJvb3QtY2Et +cHJvZHVjdGlvbi1hbW8wHhcNMTUwMzE3MjI1MzU3WhcNMjUwMzE0MjI1MzU3WjB9 +MQswCQYDVQQGEwJVUzEcMBoGA1UEChMTTW96aWxsYSBDb3Jwb3JhdGlvbjEvMC0G +A1UECxMmTW96aWxsYSBBTU8gUHJvZHVjdGlvbiBTaWduaW5nIFNlcnZpY2UxHzAd +BgNVBAMTFnJvb3QtY2EtcHJvZHVjdGlvbi1hbW8wggIgMA0GCSqGSIb3DQEBAQUA +A4ICDQAwggIIAoICAQC0u2HXXbrwy36+MPeKf5jgoASMfMNz7mJWBecJgvlTf4hH +JbLzMPsIUauzI9GEpLfHdZ6wzSyFOb4AM+D1mxAWhuZJ3MDAJOf3B1Rs6QorHrl8 +qqlNtPGqepnpNJcLo7JsSqqE3NUm72MgqIHRgTRsqUs+7LIPGe7262U+N/T0LPYV +Le4rZ2RDHoaZhYY7a9+49mHOI/g2YFB+9yZjE+XdplT2kBgA4P8db7i7I0tIi4b0 +B0N6y9MhL+CRZJyxdFe2wBykJX14LsheKsM1azHjZO56SKNrW8VAJTLkpRxCmsiT +r08fnPyDKmaeZ0BtsugicdipcZpXriIGmsZbI12q5yuwjSELdkDV6Uajo2n+2ws5 +uXrP342X71WiWhC/dF5dz1LKtjBdmUkxaQMOP/uhtXEKBrZo1ounDRQx1j7+SkQ4 +BEwjB3SEtr7XDWGOcOIkoJZWPACfBLC3PJCBWjTAyBlud0C5n3Cy9regAAnOIqI1 +t16GU2laRh7elJ7gPRNgQgwLXeZcFxw6wvyiEcmCjOEQ6PM8UQjthOsKlszMhlKw +vjyOGDoztkqSBy/v+Asx7OW2Q7rlVfKarL0mREZdSMfoy3zTgtMVCM0vhNl6zcvf +5HNNopoEdg5yuXo2chZ1p1J+q86b0G5yJRMeT2+iOVY2EQ37tHrqUURncCy4uwIB +A6OB7TCB6jAMBgNVHRMEBTADAQH/MA4GA1UdDwEB/wQEAwIBBjAWBgNVHSUBAf8E +DDAKBggrBgEFBQcDAzCBkgYDVR0jBIGKMIGHoYGBpH8wfTELMAkGA1UEBhMCVVMx +HDAaBgNVBAoTE01vemlsbGEgQ29ycG9yYXRpb24xLzAtBgNVBAsTJk1vemlsbGEg +QU1PIFByb2R1Y3Rpb24gU2lnbmluZyBTZXJ2aWNlMR8wHQYDVQQDExZyb290LWNh +LXByb2R1Y3Rpb24tYW1vggEBMB0GA1UdDgQWBBSzvOpYdKvhbngqsqucIx6oYyyX +tzANBgkqhkiG9w0BAQwFAAOCAgEAaNSRYAaECAePQFyfk12kl8UPLh8hBNidP2H6 +KT6O0vCVBjxmMrwr8Aqz6NL+TgdPmGRPDDLPDpDJTdWzdj7khAjxqWYhutACTew5 +eWEaAzyErbKQl+duKvtThhV2p6F6YHJ2vutu4KIciOMKB8dslIqIQr90IX2Usljq +8Ttdyf+GhUmazqLtoB0GOuESEqT4unX6X7vSGu1oLV20t7t5eCnMMYD67ZBn0YIU +/cm/+pan66hHrja+NeDGF8wabJxdqKItCS3p3GN1zUGuJKrLykxqbOp/21byAGog +Z1amhz6NHUcfE6jki7sM7LHjPostU5ZWs3PEfVVgha9fZUhOrIDsyXEpCWVa3481 +LlAq3GiUMKZ5DVRh9/Nvm4NwrTfB3QkQQJCwfXvO9pwnPKtISYkZUqhEqvXk5nBg +QCkDSLDjXTx39naBBGIVIqBtKKuVTla9enngdq692xX/CgO6QJVrwpqdGjebj5P8 +5fNZPABzTezG3Uls5Vp+4iIWVAEDkK23cUj3c/HhE+Oo7kxfUeu5Y1ZV3qr61+6t +ZARKjbu1TuYQHf0fs+GwID8zeLc2zJL7UzcHFwwQ6Nda9OJN4uPAuC/BKaIpxCLL +26b24/tRam4SJjqpiq20lynhUrmTtt6hbG3E1Hpy3bmkt2DYnuMFwEx2gfXNcnbT +wNuvFqc= +-----END CERTIFICATE-----`) + +// sign a document with openssl and verify the signature with pkcs7. +// this uses a chain of root, intermediate and signer cert, where the +// intermediate is added to the certs but the root isn't. +func TestSignWithOpenSSLAndVerify(t *testing.T) { + content := []byte(` +A ship in port is safe, +but that's not what ships are built for. +-- Grace Hopper`) + // write the content to a temp file + tmpContentFile, err := ioutil.TempFile("", "TestSignWithOpenSSLAndVerify_content") + if err != nil { + t.Fatal(err) + } + ioutil.WriteFile(tmpContentFile.Name(), content, 0755) + sigalgs := []x509.SignatureAlgorithm{ + x509.SHA1WithRSA, + x509.SHA256WithRSA, + x509.SHA512WithRSA, + x509.ECDSAWithSHA1, + x509.ECDSAWithSHA256, + x509.ECDSAWithSHA384, + x509.ECDSAWithSHA512, + } + for _, sigalgroot := range sigalgs { + rootCert, err := createTestCertificateByIssuer("PKCS7 Test Root CA", nil, sigalgroot, true) + if err != nil { + t.Fatalf("test %s: cannot generate root cert: %s", sigalgroot, err) + } + truststore := x509.NewCertPool() + truststore.AddCert(rootCert.Certificate) + for _, sigalginter := range sigalgs { + interCert, err := createTestCertificateByIssuer("PKCS7 Test Intermediate Cert", rootCert, sigalginter, true) + if err != nil { + t.Fatalf("test %s/%s: cannot generate intermediate cert: %s", sigalgroot, sigalginter, err) + } + // write the intermediate cert to a temp file + tmpInterCertFile, err := ioutil.TempFile("", "TestSignWithOpenSSLAndVerify_intermediate") + if err != nil { + t.Fatal(err) + } + fd, err := os.OpenFile(tmpInterCertFile.Name(), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755) + if err != nil { + t.Fatal(err) + } + pem.Encode(fd, &pem.Block{Type: "CERTIFICATE", Bytes: interCert.Certificate.Raw}) + fd.Close() + for _, sigalgsigner := range sigalgs { + signerCert, err := createTestCertificateByIssuer("PKCS7 Test Signer Cert", interCert, sigalgsigner, false) + if err != nil { + t.Fatalf("test %s/%s/%s: cannot generate signer cert: %s", sigalgroot, sigalginter, sigalgsigner, err) + } + + // write the signer cert to a temp file + tmpSignerCertFile, err := ioutil.TempFile("", "TestSignWithOpenSSLAndVerify_signer") + if err != nil { + t.Fatal(err) + } + fd, err = os.OpenFile(tmpSignerCertFile.Name(), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755) + if err != nil { + t.Fatal(err) + } + pem.Encode(fd, &pem.Block{Type: "CERTIFICATE", Bytes: signerCert.Certificate.Raw}) + fd.Close() + + // write the signer key to a temp file + tmpSignerKeyFile, err := ioutil.TempFile("", "TestSignWithOpenSSLAndVerify_key") + if err != nil { + t.Fatal(err) + } + fd, err = os.OpenFile(tmpSignerKeyFile.Name(), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755) + if err != nil { + t.Fatal(err) + } + var derKey []byte + priv := *signerCert.PrivateKey + switch priv := priv.(type) { + case *rsa.PrivateKey: + derKey = x509.MarshalPKCS1PrivateKey(priv) + pem.Encode(fd, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: derKey}) + case *ecdsa.PrivateKey: + derKey, err = x509.MarshalECPrivateKey(priv) + if err != nil { + t.Fatal(err) + } + pem.Encode(fd, &pem.Block{Type: "EC PRIVATE KEY", Bytes: derKey}) + } + fd.Close() + + // write the root cert to a temp file + tmpSignedFile, err := ioutil.TempFile("", "TestSignWithOpenSSLAndVerify_signature") + if err != nil { + t.Fatal(err) + } + // call openssl to sign the content + opensslCMD := exec.Command("openssl", "smime", "-sign", "-nodetach", + "-in", tmpContentFile.Name(), "-out", tmpSignedFile.Name(), + "-signer", tmpSignerCertFile.Name(), "-inkey", tmpSignerKeyFile.Name(), + "-certfile", tmpInterCertFile.Name(), "-outform", "PEM") + out, err := opensslCMD.CombinedOutput() + if err != nil { + t.Fatalf("test %s/%s/%s: openssl command failed with %s: %s", sigalgroot, sigalginter, sigalgsigner, err, out) + } + + // verify the signed content + pemSignature, err := ioutil.ReadFile(tmpSignedFile.Name()) + if err != nil { + t.Fatal(err) + } + derBlock, _ := pem.Decode(pemSignature) + if derBlock == nil { + break + } + p7, err := Parse(derBlock.Bytes) + if err != nil { + t.Fatalf("Parse encountered unexpected error: %v", err) + } + if err := p7.VerifyWithChain(truststore); err != nil { + t.Fatalf("Verify failed with error: %v", err) + } + // Verify the certificate chain to make sure the identified root + // is the one we expect + ee := getCertFromCertsByIssuerAndSerial(p7.Certificates, p7.Signers[0].IssuerAndSerialNumber) + if ee == nil { + t.Fatalf("No end-entity certificate found for signer") + } + chains, err := verifyCertChain(ee, p7.Certificates, truststore, time.Now()) + if err != nil { + t.Fatal(err) + } + if len(chains) != 1 { + t.Fatalf("Expected to find one chain, but found %d", len(chains)) + } + if len(chains[0]) != 3 { + t.Fatalf("Expected to find three certificates in chain, but found %d", len(chains[0])) + } + if chains[0][0].Subject.CommonName != "PKCS7 Test Signer Cert" { + t.Fatalf("Expected to find EE certificate with subject 'PKCS7 Test Signer Cert', but found '%s'", chains[0][0].Subject.CommonName) + } + if chains[0][1].Subject.CommonName != "PKCS7 Test Intermediate Cert" { + t.Fatalf("Expected to find intermediate certificate with subject 'PKCS7 Test Intermediate Cert', but found '%s'", chains[0][1].Subject.CommonName) + } + if chains[0][2].Subject.CommonName != "PKCS7 Test Root CA" { + t.Fatalf("Expected to find root certificate with subject 'PKCS7 Test Root CA', but found '%s'", chains[0][2].Subject.CommonName) + } + os.Remove(tmpSignerCertFile.Name()) // clean up + os.Remove(tmpSignerKeyFile.Name()) // clean up + } + os.Remove(tmpInterCertFile.Name()) // clean up + } + } + os.Remove(tmpContentFile.Name()) // clean up +} + +func TestDSASignWithOpenSSLAndVerify(t *testing.T) { + content := []byte(` +A ship in port is safe, +but that's not what ships are built for. +-- Grace Hopper`) + // write the content to a temp file + tmpContentFile, err := ioutil.TempFile("", "TestDSASignWithOpenSSLAndVerify_content") + if err != nil { + t.Fatal(err) + } + ioutil.WriteFile(tmpContentFile.Name(), content, 0755) + + // write the signer cert to a temp file + tmpSignerCertFile, err := ioutil.TempFile("", "TestDSASignWithOpenSSLAndVerify_signer") + if err != nil { + t.Fatal(err) + } + ioutil.WriteFile(tmpSignerCertFile.Name(), dsaPublicCert, 0755) + + // write the signer key to a temp file + tmpSignerKeyFile, err := ioutil.TempFile("", "TestDSASignWithOpenSSLAndVerify_key") + if err != nil { + t.Fatal(err) + } + ioutil.WriteFile(tmpSignerKeyFile.Name(), dsaPrivateKey, 0755) + + tmpSignedFile, err := ioutil.TempFile("", "TestDSASignWithOpenSSLAndVerify_signature") + if err != nil { + t.Fatal(err) + } + // call openssl to sign the content + opensslCMD := exec.Command("openssl", "smime", "-sign", "-nodetach", "-md", "sha1", + "-in", tmpContentFile.Name(), "-out", tmpSignedFile.Name(), + "-signer", tmpSignerCertFile.Name(), "-inkey", tmpSignerKeyFile.Name(), + "-certfile", tmpSignerCertFile.Name(), "-outform", "PEM") + out, err := opensslCMD.CombinedOutput() + if err != nil { + t.Fatalf("openssl command failed with %s: %s", err, out) + } + + // verify the signed content + pemSignature, err := ioutil.ReadFile(tmpSignedFile.Name()) + if err != nil { + t.Fatal(err) + } + fmt.Printf("%s\n", pemSignature) + derBlock, _ := pem.Decode(pemSignature) + if derBlock == nil { + t.Fatalf("failed to read DER block from signature PEM %s", tmpSignedFile.Name()) + } + p7, err := Parse(derBlock.Bytes) + if err != nil { + t.Fatalf("Parse encountered unexpected error: %v", err) + } + if err := p7.Verify(); err != nil { + t.Fatalf("Verify failed with error: %v", err) + } + os.Remove(tmpSignerCertFile.Name()) // clean up + os.Remove(tmpSignerKeyFile.Name()) // clean up + os.Remove(tmpContentFile.Name()) // clean up +} + +var dsaPrivateKey = []byte(`-----BEGIN PRIVATE KEY----- +MIIBSwIBADCCASwGByqGSM44BAEwggEfAoGBAP1/U4EddRIpUt9KnC7s5Of2EbdS +PO9EAMMeP4C2USZpRV1AIlH7WT2NWPq/xfW6MPbLm1Vs14E7gB00b/JmYLdrmVCl +pJ+f6AR7ECLCT7up1/63xhv4O1fnxqimFQ8E+4P208UewwI1VBNaFpEy9nXzrith +1yrv8iIDGZ3RSAHHAhUAl2BQjxUjC8yykrmCouuEC/BYHPUCgYEA9+GghdabPd7L +vKtcNrhXuXmUr7v6OuqC+VdMCz0HgmdRWVeOutRZT+ZxBxCBgLRJFnEj6EwoFhO3 +zwkyjMim4TwWeotUfI0o4KOuHiuzpnWRbqN/C/ohNWLx+2J6ASQ7zKTxvqhRkImo +g9/hWuWfBpKLZl6Ae1UlZAFMO/7PSSoEFgIUfW4aPdQBn9gJZp2KuNpzgHzvfsE= +-----END PRIVATE KEY-----`) + +var dsaPublicCert = []byte(`-----BEGIN CERTIFICATE----- +MIIDOjCCAvWgAwIBAgIEPCY/UDANBglghkgBZQMEAwIFADBsMRAwDgYDVQQGEwdV +bmtub3duMRAwDgYDVQQIEwdVbmtub3duMRAwDgYDVQQHEwdVbmtub3duMRAwDgYD +VQQKEwdVbmtub3duMRAwDgYDVQQLEwdVbmtub3duMRAwDgYDVQQDEwdVbmtub3du +MB4XDTE4MTAyMjEzNDMwN1oXDTQ2MDMwOTEzNDMwN1owbDEQMA4GA1UEBhMHVW5r +bm93bjEQMA4GA1UECBMHVW5rbm93bjEQMA4GA1UEBxMHVW5rbm93bjEQMA4GA1UE +ChMHVW5rbm93bjEQMA4GA1UECxMHVW5rbm93bjEQMA4GA1UEAxMHVW5rbm93bjCC +AbgwggEsBgcqhkjOOAQBMIIBHwKBgQD9f1OBHXUSKVLfSpwu7OTn9hG3UjzvRADD +Hj+AtlEmaUVdQCJR+1k9jVj6v8X1ujD2y5tVbNeBO4AdNG/yZmC3a5lQpaSfn+gE +exAiwk+7qdf+t8Yb+DtX58aophUPBPuD9tPFHsMCNVQTWhaRMvZ1864rYdcq7/Ii +Axmd0UgBxwIVAJdgUI8VIwvMspK5gqLrhAvwWBz1AoGBAPfhoIXWmz3ey7yrXDa4 +V7l5lK+7+jrqgvlXTAs9B4JnUVlXjrrUWU/mcQcQgYC0SRZxI+hMKBYTt88JMozI +puE8FnqLVHyNKOCjrh4rs6Z1kW6jfwv6ITVi8ftiegEkO8yk8b6oUZCJqIPf4Vrl +nwaSi2ZegHtVJWQBTDv+z0kqA4GFAAKBgQDCriMPbEVBoRK4SOUeFwg7+VRf4TTp +rcOQC9IVVoCjXzuWEGrp3ZI7YWJSpFnSch4lk29RH8O0HpI/NOzKnOBtnKr782pt +1k/bJVMH9EaLd6MKnAVjrCDMYBB0MhebZ8QHY2elZZCWoqDYAcIDOsEx+m4NLErT +ypPnjS5M0jm1PKMhMB8wHQYDVR0OBBYEFC0Yt5XdM0Kc95IX8NQ8XRssGPx7MA0G +CWCGSAFlAwQDAgUAAzAAMC0CFQCIgQtrZZ9hdZG1ROhR5hc8nYEmbgIUAIlgC688 +qzy/7yePTlhlpj+ahMM= +-----END CERTIFICATE-----`)