我在从opaque签名的S / MIME邮件中提取邮件数据时遇到问题,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
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实际上是来自demo/smime/ test.py的M2Crypto(0.21.1)sign
函数生成的不透明的S / MIME签名(未加密)消息opaque.p7。数据显然包含消息,它可以显示为例如作者:openssl smime -verify -noverify -in opaque.p7
。
不幸的是,当我想要获取数据时:
p7, data = M2Crypto.SMIME.smime_load_pkcs7('opaque.p7')
不幸的是,data
是None
。这只是不透明的S / MIME变体的一个问题,因为同样适用于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。
以下是修改后的test.py(原始here)的输出,为了证明清除和不透明的S / MIME消息,M2Crypto正确提取签名者证书,但不提取不透明SMIME中的数据:
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,因为它在很多地方失败了..
--- 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,因此它使用的是由openssl req -new -x509 -newkey rsa -nodes -keyout client_.pem -out client_.pem
生成的自签名client_.pem
(请注意, test load& verify opaque testcase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)
答案 0 :(得分:1)
我认为这里的主要误解是,对于“multipart/signed
”以外的MIME类型,smime_load_pkcs7()
意味着返回None
在元组的第二部分中,SMIME.SMIME.verify()
意味着将None
作为其第二个参数。
当您致电s.verify(a, b)
时,并不意味着“验证a
中的签名是否与消息b
匹配”,这意味着“验证PKCS7结构{{1}如果xIM9存储和堆栈在SMIME对象a
上,则有一个有效的签名。哦,如果s
有一条分离的消息,你可以在a
中找到消息部分。“
如果您想修复b
功能,请完全删除verify_opaque()
内容,然后重新拨打原始data_s
电话。如果s.verify(p7, data)
,则原始邮件的提取按预期进行和验证签名。如果您仍想打印“DATA:”行,请使用v == ptxt
代替v
。
如果您的问题是如何从任意不透明的签名邮件中获取原始邮件数据,那么您似乎需要获得有效的data_s
上下文M2Crypto.SMIME.SMIME
并致电s
用它!这不是我以前需要做的操作,所以我可能会遗漏一些简单的API,但据我所知,M2Crypto不会暴露任何更简单的方法。至少,如果您没有要检查的有效证书集,或者您不关心,您可以将s.verify()
标记传递给PKCS7_NOVERIFY
,就像使用openssl一样cmdline工具。