我从不透明的签名 S/MIME 消息中提取消息数据时遇到问题，例如：
To: ngps@post1.com
From: ngps@mpost1.com
Subject: testing
MIME-Version: 1.0
Content-Disposition: attachment; filename="smime.p7m"
Content-Type: application/pkcs7-mime; smime-type=signed-data; name="smime.p7m"
Content-Transfer-Encoding: base64
MIIHQwYJKoZIhvcNAQcCoIIHNDCCBzACAQExCzAJBgUrDgMCGgUAMIICQwYJKoZI
hvcNAQcBoIICNASCAjANClMvTUlNRSAtIFNlY3VyZSBNdWx0aXB1cnBvc2UgSW50
ZXJuZXQgTWFpbCBFeHRlbnNpb25zIFtSRkMgMjMxMSwgUkZDIDIzMTJdIC0gDQpw
cm92aWRlcyBhIGNvbnNpc3RlbnQgd2F5IHRvIHNlbmQgYW5kIHJlY2VpdmUgc2Vj
dXJlIE1JTUUgZGF0YS4gQmFzZWQgb24gdGhlDQpwb3B1bGFyIEludGVybmV0IE1J
TUUgc3RhbmRhcmQsIFMvTUlNRSBwcm92aWRlcyB0aGUgZm9sbG93aW5nIGNyeXB0
b2dyYXBoaWMNCnNlY3VyaXR5IHNlcnZpY2VzIGZvciBlbGVjdHJvbmljIG1lc3Nh
Z2luZyBhcHBsaWNhdGlvbnMgLSBhdXRoZW50aWNhdGlvbiwNCm1lc3NhZ2UgaW50
ZWdyaXR5IGFuZCBub24tcmVwdWRpYXRpb24gb2Ygb3JpZ2luICh1c2luZyBkaWdp
dGFsIHNpZ25hdHVyZXMpDQphbmQgcHJpdmFjeSBhbmQgZGF0YSBzZWN1cml0eSAo
dXNpbmcgZW5jcnlwdGlvbikuDQoNClMvTUlNRSBpcyBidWlsdCBvbiB0aGUgUEtD
UyAjNyBzdGFuZGFyZC4gW1BLQ1M3XQ0KDQpTL01JTUUgaXMgaW1wbGVtZW50ZWQg
aW4gTmV0c2NhcGUgTWVzc2VuZ2VyIGFuZCBNaWNyb3NvZnQgT3V0bG9vay4NCqCC
AxAwggMMMIICdaADAgECAgECMA0GCSqGSIb3DQEBBAUAMHsxCzAJBgNVBAYTAlNH
MREwDwYDVQQKEwhNMkNyeXB0bzEUMBIGA1UECxMLTTJDcnlwdG8gQ0ExJDAiBgNV
BAMTG00yQ3J5cHRvIENlcnRpZmljYXRlIE1hc3RlcjEdMBsGCSqGSIb3DQEJARYO
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hkiG9w0BAQEFAANLADBIAkEAoz3zUF0dmxSU+1fso+eTdmjDY71gWNeXWX28qsBJ
0UFmq4JCtw7Gv4fJ0TZgQHVIrXgKrUvzsquu8eiVjuP/NwIDAQABo4IBBDCCAQAw
CQYDVR0TBAIwADAsBglghkgBhvhCAQ0EHxYdT3BlblNTTCBHZW5lcmF0ZWQgQ2Vy
dGlmaWNhdGUwHQYDVR0OBBYEFMcQhEeJ1x9d+8Rzag9yjCiutYKOMIGlBgNVHSME
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MA8GA1UEChMITTJDcnlwdG8xFDASBgNVBAsTC00yQ3J5cHRvIENBMSQwIgYDVQQD
ExtNMkNyeXB0byBDZXJ0aWZpY2F0ZSBNYXN0ZXIxHTAbBgkqhkiG9w0BCQEWDm5n
cHNAcG9zdDEuY29tggEAMA0GCSqGSIb3DQEBBAUAA4GBAKy2cWa2BF6cbBPE4ici
//wOqkLDbsI3YZyUSj7ZPnefghx9EwRJfLB3/sXEf78OHL7yV6IMrvEVEAJCYs+3
w/lspCMJC0hOomxnt0vjyCCd0JeaEwihQGbOo9V0reXzrUy8yNkwo1w8mMSbIvqh
+D5uTB0jKL/ml1EVLw3NJf68MYIBwTCCAb0CAQEwgYAwezELMAkGA1UEBhMCU0cx
ETAPBgNVBAoTCE0yQ3J5cHRvMRQwEgYDVQQLEwtNMkNyeXB0byBDQTEkMCIGA1UE
AxMbTTJDcnlwdG8gQ2VydGlmaWNhdGUgTWFzdGVyMR0wGwYJKoZIhvcNAQkBFg5u
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DgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFAMAcGBSsOAwIHMA0GCCqGSIb3
DQMCAgEoMA0GCSqGSIb3DQEBAQUABEAPrw12PT+5T9kftixVi+MzE/SLZnOJqw9x
2q1YcztjY4drOJi6CH8bHOlfb1nXr/mBQuijLA5wFl22PDGTrlZ5
这实际上是由来自demo/smime/sign test.py 的 M2Crypto (0.21.1)函数生成的不透明 S/MIME 签名（未加密）消息opaque.p7 。数据显然包含消息，例如可以通过以下方式显示：。openssl smime -verify -noverify -in opaque.p7
不幸的是，当我想通过以下方式获取数据时：
p7, data = M2Crypto.SMIME.smime_load_pkcs7('opaque.p7')
不幸的是，data是None。这只是不透明 S/MIME 变体的问题，因为clear.p7.
我想这可能是一些兼容性问题，我的 OpenSSL 版本是 1.0.1e (Debian Wheezy)。我想知道是否有人让它工作。
更新
这是修改后的 test.py 的输出（此处为原始），以证明对于清晰和不透明的 S/MIME 消息，M2Crypto 正确提取签名者证书，但不从不透明的 SMIME 中提取数据：
test encrypt/decrypt... ok
test sign & save... ok
test load & verify opaque... ok
DATA: ''
SIGNERS: ['C=AU, ST=Some-State, O=Internet Widgits Pty Ltd']
test load & verify clear... ok
DATA: 'actual message'
SIGNERS: ['C=AU, ST=Some-State, O=Internet Widgits Pty Ltd']
test sign/verify... ok
test.py 已修补，因为它在许多地方都失败了..
--- M2Crypto-0.21.1.orig/demo/smime/test.py 2011-01-15 20:10:06.000000000 +0100
+++ M2Crypto-0.21.1/demo/smime/test.py 2013-07-16 16:37:57.224845942 +0200
@@ -6,18 +6,7 @@
from M2Crypto import BIO, Rand, SMIME, X509
-ptxt = """
-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.
-"""
+ptxt = 'actual message'
def makebuf():
buf = BIO.MemoryBuffer(ptxt)
@@ -27,14 +16,14 @@
print 'test sign & save...',
buf = makebuf()
s = SMIME.SMIME()
- s.load_key('client.pem')
- p7 = s.sign(buf)
+ s.load_key('client_.pem')
+ p7 = s.sign(buf, flags=SMIME.PKCS7_DETACHED)
out = BIO.openfile('clear.p7', 'w')
out.write('To: ngps@post1.com\n')
out.write('From: ngps@post1.com\n')
out.write('Subject: testing\n')
buf = makebuf() # Recreate buf, because sign() has consumed it.
- s.write(out, p7, buf)
+ s.write(out, p7, buf, flags=SMIME.PKCS7_DETACHED)
out.close()
buf = makebuf()
@@ -50,36 +39,42 @@
def verify_clear():
print 'test load & verify clear...',
s = SMIME.SMIME()
- x509 = X509.load_cert('client.pem')
+ x509 = X509.load_cert('client_.pem')
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
st = X509.X509_Store()
- st.load_info('ca.pem')
+ st.load_info('client_.pem')
s.set_x509_store(st)
p7, data = SMIME.smime_load_pkcs7('clear.p7')
- v = s.verify(p7)
- if v:
+ data_s = data.read() if isinstance(data, BIO.BIO) else ''
+ v = s.verify(p7, BIO.MemoryBuffer(data_s))
+ if v and (v == ptxt):
print 'ok'
else:
print 'not ok'
+ print ' DATA: %r' % (data_s,)
+ print ' SIGNERS: %r' % ([ x.get_subject().as_text() for x in p7.get0_signers(sk)],)
def verify_opaque():
print 'test load & verify opaque...',
s = SMIME.SMIME()
- x509 = X509.load_cert('client.pem')
+ x509 = X509.load_cert('client_.pem')
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
st = X509.X509_Store()
- st.load_info('ca.pem')
+ st.load_info('client_.pem')
s.set_x509_store(st)
p7, data = SMIME.smime_load_pkcs7('opaque.p7')
- v = s.verify(p7, data)
- if v:
+ data_s = data.read() if isinstance(data, BIO.BIO) else ''
+ v = s.verify(p7, makebuf()) # here we are verify against ptxt, since we get no data
+ if v and (v == ptxt):
print 'ok'
else:
print 'not ok'
+ print ' DATA: %r' % (data_s,)
+ print ' SIGNERS: %r' % ([ x.get_subject().as_text() for x in p7.get0_signers(sk)],)
def verify_netscape():
print 'test load & verify netscape messager output...',
@@ -102,31 +97,32 @@
s = SMIME.SMIME()
# Load a private key.
- s.load_key('client.pem')
+ s.load_key('client_.pem')
# Sign.
- p7 = s.sign(buf)
+ p7 = s.sign(buf, flags=SMIME.PKCS7_DETACHED)
# Output the stuff.
+ buf = makebuf()
bio = BIO.MemoryBuffer()
- s.write(bio, p7, buf)
+ s.write(bio, p7, buf, flags=SMIME.PKCS7_DETACHED)
# Plumbing for verification: CA's cert.
st = X509.X509_Store()
- st.load_info('ca.pem')
+ st.load_info('client_.pem')
s.set_x509_store(st)
# Plumbing for verification: Signer's cert.
- x509 = X509.load_cert('client.pem')
+ x509 = X509.load_cert('client_.pem')
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
# Verify.
p7, buf = SMIME.smime_load_pkcs7_bio(bio)
- v = s.verify(p7, flags=SMIME.PKCS7_DETACHED)
-
- if v:
+ v = s.verify(p7, buf, flags=SMIME.PKCS7_DETACHED)
+
+ if v and (v == ptxt):
print 'ok'
else:
print 'not ok'
client.pem 包含过期的证书，所以它使用自签名的 client_.pem，它是由生成的openssl req -new -x509 -newkey rsa -nodes -keyout client_.pem -out client_.pem
（请注意，测试加载和验证不透明测试用例假装成功，因为验证步骤已更改为针对原始已知文本进行验证）