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verify3.py
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verify3.py
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#!/usr/bin/env python
#
# $Id$
#
# PyXMLSec example: Verifying a file signed with X509 certificate
#
# Verifies a file signed with X509 certificate.
#
# This example was developed and tested with OpenSSL crypto library. The
# certificates management policies for another crypto library may break it.
#
# Usage:
# verify3.py <signed-file> <trusted-cert-pem-file1> [<trusted-cert-pem-file2> [...]]
#
# Example:
# ./verify3.py sign3-res.xml rootcert.pem
#
# This is free software; see COPYING file in the source
# distribution for preciese wording.
#
# Copyright (C) 2003-2013 Valery Febvre <vfebvre@easter-eggs.com>
#
import sys, os
sys.path.insert(0, '../')
import libxml2
import xmlsec
def main():
assert(sys.argv)
if len(sys.argv) < 3:
print "Error: wrong number of arguments."
print "Usage: %s <xml-file> <cert-file1> [<cert-file2> [...]]" % sys.argv[0]
return sys.exit(1)
# Init libxml library
libxml2.initParser()
libxml2.substituteEntitiesDefault(1)
# Init xmlsec library
if xmlsec.init() < 0:
print "Error: xmlsec initialization failed."
return sys.exit(-1)
# Check loaded library version
if xmlsec.checkVersion() != 1:
print "Error: loaded xmlsec library version is not compatible.\n"
sys.exit(-1)
# Init crypto library
if xmlsec.cryptoAppInit(None) < 0:
print "Error: crypto initialization failed."
# Init xmlsec-crypto library
if xmlsec.cryptoInit() < 0:
print "Error: xmlsec-crypto initialization failed."
# Create keys manager and load trusted certificates
mngr = load_trusted_certs(sys.argv[2:], len(sys.argv) - 2)
# Verify file
if mngr is not None:
res = verify_file(mngr, sys.argv[1])
# Destroy keys manager
mngr.destroy()
# Shutdown xmlsec-crypto library
xmlsec.cryptoShutdown()
# Shutdown crypto library
xmlsec.cryptoAppShutdown()
# Shutdown xmlsec library
xmlsec.shutdown()
# Shutdown LibXML2
libxml2.cleanupParser()
sys.exit(res)
# Creates simple keys manager and load trusted certificates from PEM files.
# The caller is responsible for destroying returned keys manager using
# destroy method.
#
# Returns the newly created keys manager or None if an error occurs.
def load_trusted_certs(files, files_size):
assert(files)
assert(files_size > 0)
# Create and initialize keys manager, we use a simple list based
# keys manager, implement your own KeysStore klass if you need
# something more sophisticated
mngr = xmlsec.KeysMngr()
if mngr is None:
print "Error: failed to create keys manager."
return None
if xmlsec.cryptoAppDefaultKeysMngrInit(mngr) < 0:
print "Error: failed to initialize keys manager."
mngr.destroy()
return None
for file in files:
if not check_filename(file):
mngr.destroy()
return None
# Load trusted cert
if mngr.certLoad(file, xmlsec.KeyDataFormatPem,
xmlsec.KeyDataTypeTrusted) < 0:
print "Error: failed to load pem certificate from \"%s\"", file
mngr.destroy()
return None
return mngr
# Verifies XML signature in xml_file.
# Returns 0 on success or a negative value if an error occurs.
def verify_file(mngr, xml_file):
assert(mngr)
assert(xml_file)
# Load XML file
if not check_filename(xml_file):
return -1
doc = libxml2.parseFile(xml_file)
if doc is None or doc.getRootElement() is None:
print "Error: unable to parse file \"%s\"" % tmpl_file
return cleanup(doc)
# Find start node
node = xmlsec.findNode(doc.getRootElement(),
xmlsec.NodeSignature, xmlsec.DSigNs)
if node is None:
print "Error: start node not found in \"%s\"", xml_file
# Create signature context
dsig_ctx = xmlsec.DSigCtx(mngr)
if dsig_ctx is None:
print "Error: failed to create signature context"
return cleanup(doc)
# Verify signature
if dsig_ctx.verify(node) < 0:
print "Error: signature verify"
return cleanup(doc, dsig_ctx)
# Print verification result to stdout
if dsig_ctx.status == xmlsec.DSigStatusSucceeded:
print "Signature is OK"
else:
print "Signature is INVALID"
# Success
return cleanup(doc, dsig_ctx, 1)
def cleanup(doc=None, dsig_ctx=None, res=-1):
if dsig_ctx is not None:
dsig_ctx.destroy()
if doc is not None:
doc.freeDoc()
return res
def check_filename(filename):
if os.access(filename, os.R_OK):
return 1
else:
print "Error: XML file \"%s\" not found OR no read access" % filename
return 0
if __name__ == "__main__":
main()