90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
package crypto
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import (
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"bytes"
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"io/ioutil"
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"net/mail"
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"net/textproto"
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"strings"
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pmmime "github.com/ProtonMail/go-mime"
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"golang.org/x/crypto/openpgp"
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"golang.org/x/crypto/openpgp/packet"
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)
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func (pm PmCrypto) parseMIME(
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mimeBody string, verifierKey *KeyRing,
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) (*pmmime.BodyCollector, int, []string, []string, error) {
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mm, err := mail.ReadMessage(strings.NewReader(mimeBody))
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if err != nil {
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return nil, 0, nil, nil, err
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}
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config := &packet.Config{DefaultCipher: packet.CipherAES256, Time: pm.getTimeGenerator()}
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h := textproto.MIMEHeader(mm.Header)
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mmBodyData, err := ioutil.ReadAll(mm.Body)
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if err != nil {
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return nil, 0, nil, nil, err
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}
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printAccepter := pmmime.NewMIMEPrinter()
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bodyCollector := pmmime.NewBodyCollector(printAccepter)
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attachmentsCollector := pmmime.NewAttachmentsCollector(bodyCollector)
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mimeVisitor := pmmime.NewMimeVisitor(attachmentsCollector)
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var pgpKering openpgp.KeyRing
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if verifierKey != nil {
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pgpKering = verifierKey.entities
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}
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signatureCollector := newSignatureCollector(mimeVisitor, pgpKering, config)
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err = pmmime.VisitAll(bytes.NewReader(mmBodyData), h, signatureCollector)
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verified := signatureCollector.verified
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body := bodyCollector
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atts := attachmentsCollector.GetAttachments()
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attHeaders := attachmentsCollector.GetAttHeaders()
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return body, verified, atts, attHeaders, err
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}
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// MIMECallbacks defines a call back methods to process MIME message
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type MIMECallbacks interface {
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OnBody(body string, mimetype string)
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OnAttachment(headers string, data []byte)
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// Encrypted headers can be an attachment and thus be placed at the end of the mime structure
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OnEncryptedHeaders(headers string)
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OnVerified(verified int)
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OnError(err error)
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}
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// DecryptMIMEMessage decrypts a MIME message
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func (pm *PmCrypto) DecryptMIMEMessage(
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encryptedText string, verifierKey, privateKeyRing *KeyRing,
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passphrase string, callbacks MIMECallbacks, verifyTime int64,
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) {
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decsignverify, err := pm.DecryptMessageVerify(encryptedText, verifierKey, privateKeyRing, passphrase, verifyTime)
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if err != nil {
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callbacks.OnError(err)
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return
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}
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body, verified, attachments, attachmentHeaders, err := pm.parseMIME(decsignverify.Plaintext, verifierKey)
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if err != nil {
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callbacks.OnError(err)
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return
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}
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bodyContent, bodyMimeType := body.GetBody()
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callbacks.OnBody(bodyContent, bodyMimeType)
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for i := 0; i < len(attachments); i++ {
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callbacks.OnAttachment(attachmentHeaders[i], []byte(attachments[i]))
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}
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callbacks.OnEncryptedHeaders("")
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if decsignverify.Verify == notSigned {
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callbacks.OnVerified(verified)
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} else {
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callbacks.OnVerified(decsignverify.Verify)
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}
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}
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