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remail/smime: Use certificate embedded in signature for verification

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An open list does not have the certificate of senders and for signature
verification there is no requirement to have the certificate on disk.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2020-09-02 14:45:10 +02:00
parent 43a0b5cb47
commit ea361f973c
1 changed files with 5 additions and 6 deletions
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11
remail/smime.py
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@ -106,16 +106,15 @@ class smime_crypt(object):
''' '''
mfrom = get_raw_email_addr(msg['From']) mfrom = get_raw_email_addr(msg['From'])
crt = os.path.join(self.config.list_certs, mfrom + '.crt') p7_bio = BIO.MemoryBuffer(msg.as_bytes())
x509 = X509.load_cert(crt) p7, data = SMIME.smime_load_pkcs7_bio(p7_bio)
sk = X509.X509_Stack()
sk.push(x509) sk = p7.get0_signers(X509.X509_Stack())
self.smime.set_x509_stack(sk) self.smime.set_x509_stack(sk)
store = X509.X509_Store() store = X509.X509_Store()
store.load_info(self.config.ca_certs) store.load_info(self.config.ca_certs)
self.smime.set_x509_store(store) self.smime.set_x509_store(store)
p7_bio = BIO.MemoryBuffer(msg.as_bytes())
p7, data = SMIME.smime_load_pkcs7_bio(p7_bio)
msgout = self.smime.verify(p7, data, flags=self.ca_verify) msgout = self.smime.verify(p7, data, flags=self.ca_verify)
msg_set_header(msg, 'Signature-Id', mfrom) msg_set_header(msg, 'Signature-Id', mfrom)