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#!/usr/bin/env python
"""S/MIME sender.
Copyright (c) 2000 Ng Pheng Siong. All rights reserved."""
from M2Crypto import BIO, Rand, SMIME, X509
import smtplib, string, sys
def sendsmime(from_addr, to_addrs, subject, msg, from_key, from_cert=None, to_certs=None, smtpd='localhost'):
msg_bio = BIO.MemoryBuffer(msg)
sign = from_key
encrypt = to_certs
s = SMIME.SMIME()
if sign:
s.load_key(from_key, from_cert)
p7 = s.sign(msg_bio, flags=SMIME.PKCS7_TEXT)
msg_bio = BIO.MemoryBuffer(msg) # Recreate coz sign() has consumed it.
if encrypt:
sk = X509.X509_Stack()
for x in to_certs:
sk.push(X509.load_cert(x))
s.set_x509_stack(sk)
s.set_cipher(SMIME.Cipher('rc2_40_cbc'))
tmp_bio = BIO.MemoryBuffer()
if sign:
s.write(tmp_bio, p7)
else:
tmp_bio.write(msg)
p7 = s.encrypt(tmp_bio)
out = BIO.MemoryBuffer()
out.write('From: %s\r\n' % from_addr)
out.write('To: %s\r\n' % string.join(to_addrs, ", "))
out.write('Subject: %s\r\n' % subject)
if encrypt:
s.write(out, p7)
else:
if sign:
s.write(out, p7, msg_bio, SMIME.PKCS7_TEXT)
else:
out.write('\r\n')
out.write(msg)
out.close()
smtp = smtplib.SMTP()
smtp.connect(smtpd)
smtp.sendmail(from_addr, to_addrs, out.read())
smtp.quit()
# XXX Cleanup the stack and store.
msg = """
S/MIME - Secure Multipurpose Internet Mail Extensions [RFC 2311, RFC 2312] -
provides a consistent way to send and receive secure MIME data. Based on the
popular Internet MIME standard, S/MIME provides the following cryptographic
security services for electronic messaging applications - authentication,
message integrity and non-repudiation of origin (using digital signatures)
and privacy and data security (using encryption).
S/MIME is built on the PKCS #7 standard. [PKCS7]
S/MIME is implemented in Netscape Messenger and Microsoft Outlook.
"""
if __name__ == '__main__':
Rand.load_file('../randpool.dat', -1)
sendsmime(from_addr = 'ngps@post1.com',
to_addrs = ['jerry','ngps@post1.com'],
subject = 'S/MIME testing',
msg = msg,
from_key = 'client2.pem',
#from_key = None,
#to_certs = None)
to_certs = ['client.pem'])
Rand.save_file('../randpool.dat')
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