def received(self, context):
self.poruka_odgovor = context.reply
libxml2.initParser()
libxml2.substituteEntitiesDefault(1)
xmlsec.init()
xmlsec.cryptoAppInit(None)
xmlsec.cryptoInit()
mngr = xmlsec.KeysMngr()
xmlsec.cryptoAppDefaultKeysMngrInit(mngr)
mngr.certLoad(verifyCertFile, xmlsec.KeyDataFormatPem,
xmlsec.KeyDataTypeTrusted)
doc = libxml2.parseDoc(context.reply)
xmlsec.addIDs(doc, doc.getRootElement(), ['Id'])
node = xmlsec.findNode(doc.getRootElement(), xmlsec.NodeSignature,
xmlsec.DSigNs)
dsig_ctx = xmlsec.DSigCtx(mngr)
dsig_ctx.verify(node)
if (dsig_ctx.status == xmlsec.DSigStatusSucceeded):
self.valid_signature = 1
xmlsec.cryptoShutdown()
xmlsec.cryptoAppShutdown()
xmlsec.shutdown()
libxml2.cleanupParser()
return context
def _create_context(self):
"""
create the xmlsec context for signature or verification
"""
self.dsig_ctx = xmlsec.DSigCtx(self.keysmngr)
if self.dsig_ctx is None:
raise RuntimeError, "Error: failed to create signature context"
def _antes_de_assinar_ou_verificar(self, raiz):
# Converte etree para string
xml = etree.tostring(raiz, xml_declaration=True, encoding='utf-8')
# Ativa funções criptográficas
self._ativar_funcoes_criptograficas()
# Colocamos o texto no avaliador XML FIXME: descobrir forma de evitar o uso do libxml2 neste processo
doc_xml = libxml2.parseMemory(xml, len(xml))
# Cria o contexto para manipulação do XML via sintaxe XPATH
ctxt = doc_xml.xpathNewContext()
ctxt.xpathRegisterNs(u'sig', NAMESPACE_SIG)
# Separa o nó da assinatura
noh_assinatura = ctxt.xpathEval(u'//*/sig:Signature')[0]
# Buscamos a chave no arquivo do certificado
chave = xmlsec.cryptoAppKeyLoad(
filename=str(self.certificado.caminho_arquivo),
format=xmlsec.KeyDataFormatPkcs12,
pwd=str(self.senha),
pwdCallback=None,
pwdCallbackCtx=None,
)
# Cria a variável de chamada (callable) da função de assinatura
assinador = xmlsec.DSigCtx()
# Atribui a chave ao assinador
assinador.signKey = chave
return doc_xml, ctxt, noh_assinatura, assinador
def _signXML(xml):
dsigctx = None
doc = None
try:
# initialization
libxml2.initParser()
libxml2.substituteEntitiesDefault(1)
if xmlsec.init() < 0:
raise SignatureError('xmlsec init failed')
if xmlsec.checkVersion() != 1:
raise SignatureError('incompatible xmlsec library version %s' %
str(xmlsec.checkVersion()))
if xmlsec.cryptoAppInit(None) < 0:
raise SignatureError('crypto initialization failed')
if xmlsec.cryptoInit() < 0:
raise SignatureError('xmlsec-crypto initialization failed')
# load the input
doc = libxml2.parseDoc(xml)
if not doc or not doc.getRootElement():
raise SignatureError('error parsing input xml')
node = xmlsec.findNode(doc.getRootElement(), xmlsec.NodeSignature,
xmlsec.DSigNs)
if not node:
raise SignatureError("couldn't find root node")
dsigctx = xmlsec.DSigCtx()
key = xmlsec.cryptoAppKeyLoad(key_file, xmlsec.KeyDataFormatPem,
key_pwd, None, None)
if not key:
raise SignatureError('failed to load the private key %s' %
key_file)
dsigctx.signKey = key
if key.setName(key_file) < 0:
raise SignatureError('failed to set key name')
if xmlsec.cryptoAppKeyCertLoad(key, cert_file,
xmlsec.KeyDataFormatPem) < 0:
print "Error: failed to load pem certificate \"%s\"" % cert_file
return cleanup(doc, dsigctx)
# sign
if dsigctx.sign(node) < 0:
raise SignatureError('signing failed')
signed_xml = doc.serialize()
finally:
if dsigctx:
dsigctx.destroy()
if doc:
doc.freeDoc()
xmlsec.cryptoShutdown()
xmlsec.shutdown()
libxml2.cleanupParser()
return signed_xml
def sending(self, context):
msgtype = "RacunZahtjev"
if "PoslovniProstorZahtjev" in context.envelope: msgtype = "PoslovniProstorZahtjev"
doc2 = libxml2.parseDoc(context.envelope)
zahtjev = doc2.xpathEval('//*[local-name()="%s"]' % msgtype)[0]
doc2.setRootElement(zahtjev)
x = doc2.getRootElement().newNs('http://www.apis-it.hr/fin/2012/types/f73', 'tns')
for i in doc2.xpathEval('//*'):
i.setNs(x)
libxml2.initParser()
libxml2.substituteEntitiesDefault(1)
xmlsec.init()
xmlsec.cryptoAppInit(None)
xmlsec.cryptoInit()
doc2.getRootElement().setProp('Id', msgtype)
xmlsec.addIDs(doc2, doc2.getRootElement(), ['Id'])
signNode = xmlsec.TmplSignature(doc2, xmlsec.transformExclC14NId(), xmlsec.transformRsaSha1Id(), None)
doc2.getRootElement().addChild(signNode)
refNode = signNode.addReference(xmlsec.transformSha1Id(), None, None, None)
refNode.setProp('URI', '#%s' % msgtype)
refNode.addTransform(xmlsec.transformEnvelopedId())
refNode.addTransform(xmlsec.transformExclC14NId())
dsig_ctx = xmlsec.DSigCtx()
key = xmlsec.cryptoAppKeyLoad(keyFile, xmlsec.KeyDataFormatPem, None, None, None)
dsig_ctx.signKey = key
xmlsec.cryptoAppKeyCertLoad(key, certFile, xmlsec.KeyDataFormatPem)
key.setName(keyFile)
keyInfoNode = signNode.ensureKeyInfo(None)
x509DataNode = keyInfoNode.addX509Data()
xmlsec.addChild(x509DataNode, "X509IssuerSerial")
xmlsec.addChild(x509DataNode, "X509Certificate")
dsig_ctx.sign(signNode)
if dsig_ctx is not None: dsig_ctx.destroy()
context.envelope = """<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>""" + doc2.serialize().replace('<?xml version="1.0" encoding="UTF-8"?>','') + """</soapenv:Body></soapenv:Envelope>""" # Ugly hack
# Shutdown xmlsec-crypto library, ako ne radi HTTPS onda ovo treba zakomentirati da ga ne ugasi prije reda
xmlsec.cryptoShutdown()
xmlsec.shutdown()
libxml2.cleanupParser()
return context
def _create_dsig_ctx(self):
"""Creates a new DSig Ctx on the key manager. Remember to call .destroy
on this object.
"""
dsig_ctx = xmlsec.DSigCtx(self.key_manager)
if dsig_ctx is None:
raise XMLDSIGError('Failed creating signature context.')
return dsig_ctx
def verify_file(self, xml_file, key_file):
assert(xml_file)
assert(key_file)
# Load XML file
if not self.check_filename(xml_file):
return -1
doc = libxml2.parseFile(xml_file)
if doc is None or doc.getRootElement() is None:
log.error(" unable to parse file \"%s\"" % tmpl_file)
return self.cleanup(doc)
# Find start node
node = xmlsec.findNode(doc.getRootElement(),
xmlsec.NodeSignature, xmlsec.DSigNs)
# Create signature context, we don't need keys manager in this example
dsig_ctx = xmlsec.DSigCtx()
if dsig_ctx is None:
log.error("Failed to create signature context")
return self.cleanup(doc)
# Load private key, assuming that there is not password
key = xmlsec.cryptoAppKeyLoad(key_file, xmlsec.KeyDataFormatPem,
None, None, None)
if key is None:
log.error("Failed to load private pem key from \"%s\"" % key_file)
return self.cleanup(doc, dsig_ctx)
dsig_ctx.signKey = key
# Set key name to the file name, this is just an example!
if not self.check_filename(key_file):
return self.cleanup(doc, dsig_ctx)
if key.setName(key_file) < 0:
log.error("Failed to set key name for key from \"%s\"" % key_file)
return self.cleanup(doc, dsig_ctx)
# Verify signature
if dsig_ctx.verify(node) < 0:
log.error("Signature verify failed")
return self.cleanup(doc, dsig_ctx)
# Print verification result to stdout
if dsig_ctx.status == xmlsec.DSigStatusSucceeded:
log.debug("Signature is OK")
else:
log.error("Signature is INVALID")
# Success
return self.cleanup(doc, dsig_ctx, 1)
def assina_xml(self, xml):
self._checar_certificado()
self._inicializar_cripto()
try:
doc_xml = libxml2.parseMemory(xml.encode('utf-8'),
len(xml.encode('utf-8')))
signNode = xmlsec.TmplSignature(doc_xml,
xmlsec.transformInclC14NId(),
xmlsec.transformRsaSha1Id(), None)
doc_xml.getRootElement().addChild(signNode)
refNode = signNode.addReference(
xmlsec.transformSha1Id(), None,
'#NFe43150602261542000143550010000000761792265342', None)
refNode.addTransform(xmlsec.transformEnvelopedId())
refNode.addTransform(xmlsec.transformInclC14NId())
keyInfoNode = signNode.ensureKeyInfo()
keyInfoNode.addX509Data()
dsig_ctx = xmlsec.DSigCtx()
chave = xmlsec.cryptoAppKeyLoad(filename=str(self.arquivo),
format=xmlsec.KeyDataFormatPkcs12,
pwd=str(self.senha),
pwdCallback=None,
pwdCallbackCtx=None)
dsig_ctx.signKey = chave
dsig_ctx.sign(signNode)
status = dsig_ctx.status
dsig_ctx.destroy()
if status != xmlsec.DSigStatusSucceeded:
raise RuntimeError(
'Erro ao realizar a assinatura do arquivo; status: "' +
str(status) + '"')
xpath = doc_xml.xpathNewContext()
xpath.xpathRegisterNs('sig', NAMESPACE_SIG)
certificados = xpath.xpathEval(
'//sig:X509Data/sig:X509Certificate')
for i in range(len(certificados) - 1):
certificados[i].unlinkNode()
certificados[i].freeNode()
xml = doc_xml.serialize()
return xml
finally:
doc_xml.freeDoc()
self._finalizar_cripto()
def sign_file(tmpl_file, key_file):
assert (tmpl_file)
assert (key_file)
# Load template
doc = libxml2.parseFile(tmpl_file)
if doc is None or doc.getRootElement() is None:
print "Error: unable to parse file \"%s\"" % tmpl_file
return -1
# Find start node
node = xmlsec.findNode(doc.getRootElement(), xmlsec.NodeSignature,
xmlsec.DSigNs)
if node is None:
print "Error: start node not found in \"%s\"" % tmpl_file
return cleanup(doc)
# Create signature context, we don't need keys manager in this example
dsig_ctx = xmlsec.DSigCtx()
if dsig_ctx is None:
print "Error: failed to create signature context"
return cleanup(doc)
# Load private key, assuming that there is not password
key = xmlsec.cryptoAppKeyLoad(key_file, xmlsec.KeyDataFormatPem, None,
None, None)
if key is None:
print "Error: failed to load private pem key from \"%s\"" % key_file
return cleanup(doc, dsig_ctx)
dsig_ctx.signKey = key
# Set key name to the file name, this is just an example!
if key.setName(key_file) < 0:
print "Error: failed to set key name for key from \"%s\"" % key_file
return cleanup(doc, dsig_ctx)
# Sign the template
if dsig_ctx.sign(node) < 0:
print "Error: signature failed"
return cleanup(doc, dsig_ctx)
# Print signed document to stdout
doc.dump("-")
# Success
return cleanup(doc, dsig_ctx, 1)
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 assina_xml(self, xml):
self._inicia_funcoes_externas()
xml = self._prepara_doc_xml(xml)
#
# Colocamos o texto no avaliador XML
#
doc_xml = libxml2.parseMemory(xml.encode('utf-8'), len(xml.encode('utf-8')))
#
# Separa o nó da assinatura
#
noh_assinatura = xmlsec.findNode(doc_xml.getRootElement(), xmlsec.NodeSignature, xmlsec.DSigNs)
#
# Cria a variável de chamada (callable) da função de assinatura
#
assinador = xmlsec.DSigCtx()
#
# Buscamos a chave no arquivo do certificado
#
chave = xmlsec.cryptoAppKeyLoad(filename=str(self.arquivo), format=xmlsec.KeyDataFormatPkcs12, pwd=str(self.senha), pwdCallback=None, pwdCallbackCtx=None)
#
# Atribui a chave ao assinador
#
assinador.signKey = chave
#
# Realiza a assinatura
#
assinador.sign(noh_assinatura)
#
# Guarda o status
#
status = assinador.status
#
# Libera a memória ocupada pelo assinador manualmente
#
assinador.destroy()
if status != xmlsec.DSigStatusSucceeded:
#
# Libera a memória ocupada pelo documento xml manualmente
#
doc_xml.freeDoc()
self._finaliza_funcoes_externas()
raise RuntimeError('Erro ao realizar a assinatura do arquivo; status: "' + str(status) + '"')
#
# Elimina do xml assinado a cadeia certificadora, deixando somente
# o certificado que assinou o documento
#
xpath = doc_xml.xpathNewContext()
xpath.xpathRegisterNs('sig', NAMESPACE_SIG)
certificados = xpath.xpathEval('//sig:X509Data/sig:X509Certificate')
for i in range(len(certificados)-1):
certificados[i].unlinkNode()
certificados[i].freeNode()
#
# Retransforma o documento xml em texto
#
xml = doc_xml.serialize()
#
# Libera a memória ocupada pelo documento xml manualmente
#
doc_xml.freeDoc()
self._finaliza_funcoes_externas()
xml = self._finaliza_xml(xml)
return xml
def sign_file(self, xml_file, signed_xml_file, pkcs_file, password):
assert(xml_file)
assert(pkcs_file)
assert(password)
# Load template
if not self.check_filename(xml_file):
return -1
doc = libxml2.parseFile(xml_file)
if doc is None or doc.getRootElement() is None:
log.error(" unable to parse file \"%s\"" % xml_file)
return self.cleanup(doc)
log.debug("Signing file %s using %s " % (xml_file, pkcs_file))
if self._use_template:
# If the template is already in the text ready to be filled
signNode = xmlsec.findNode(doc.getRootElement(),
xmlsec.NodeSignature,
xmlsec.DSigNs);
if signNode is None:
log.error(" failed to find signature template")
return self.cleanup(doc)
else:
# If the signature structure has to be constructed and added.
# Create signature template for RSA-SHA256 enveloped signature
signNode = xmlsec.TmplSignature(doc,
xmlsec.transformInclC14NId(),
xmlsec.transformRsaSha1Id(), None)
# Add <dsig:Signature/> node to the doc
doc.getRootElement().addChild(signNode)
# Add reference
refNode = signNode.addReference(xmlsec.transformSha1Id(),
None, "", None)
if refNode is None:
log.error("Failed to add reference to signature template")
return self.cleanup(doc)
# Add enveloped transform
if refNode.addTransform(xmlsec.transformEnvelopedId()) is None:
log.error("Failed to add enveloped transform to reference")
return self.cleanup(doc)
# Add <dsig:KeyInfo/> and <dsig:X509Data/>
keyInfoNode = signNode.ensureKeyInfo(None)
if keyInfoNode is None:
log.error("Failed to add key info")
return self.cleanup(doc)
x509DataNode = keyInfoNode.addX509Data()
if x509DataNode is None:
log.error("Failed to add X509Data node")
return self.cleanup(doc)
if xmlsec.addChild(x509DataNode,
xmlsec.NodeX509SubjectName) is None:
log.error("Failed to X509SubjectName to x509DataNode")
return self.cleanup(doc)
# Sample code from here.
# http://ndg-security.ceda.ac.uk/browser/TI12-security/trunk/python/NDG/XMLSecDoc.py?rev=920
if xmlsec.addChild(x509DataNode,
xmlsec.NodeX509Certificate) is None:
log.error("Failed to X509certificate to x509DataNode")
return self.cleanup(doc)
# endif (if use_template..)
# Create signature context, we don't need keys manager in this
# example
dsig_ctx = xmlsec.DSigCtx()
if dsig_ctx is None:
log.error("Failed to create signature context")
return self.cleanup(doc)
# Store the context..
self.dsig_ctx = dsig_ctx
# Load private key, assuming that there is not password
if not self.check_filename(pkcs_file):
return self.cleanup(doc, dsig_ctx)
#key = xmlsec.cryptoAppKeyLoad(key_file, xmlsec.KeyDataFormatPem,
# None, None, None)
key = xmlsec.cryptoAppPkcs12Load(pkcs_file, password, None, None)
if key is None:
log.error("Failed to load private pem key from \"%s\"" % pkcs_file)
return self.cleanup(doc, dsig_ctx)
dsig_ctx.signKey = key
# Load certificate and add to the key
# if not check_filename(cert_file):
# return self.cleanup(doc, dsig_ctx)
# if xmlsec.cryptoAppKeyCertLoad(key, cert_file, xmlsec.KeyDataFormatPem) < 0:
# log.error(" failed to load pem certificate \"%s\"" % cert_file
# return self.cleanup(doc, dsig_ctx)
# Set key name to the file name, this is just an example!
if key.setName(pkcs_file) < 0:
log.error("Failed to set key name for key from \"%s\"" % pkcs_file)
return self.cleanup(doc, dsig_ctx)
# Sign the template
if dsig_ctx.sign(signNode) < 0:
log.error("Signature failed")
return self.cleanup(doc, dsig_ctx)
# Print signed document to stdout
#doc.dump("-")
#doc.formatDump("-", 0)
import libxml2mod
fp = file(signed_xml_file, "w")
libxml2mod.xmlDocFormatDump(fp, doc._o, 0)
fp.close()
# Success
return self.cleanup(doc, dsig_ctx, 1)
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)
# Limit the Reference URI attributes to empty or None
dsig_ctx.enabledReferenceUris = xmlsec.TransformUriTypeEmpty
# Limit allowed transforms for signature and reference processing
if (dsig_ctx.enableSignatureTransform(xmlsec.transformInclC14NId()) < 0 or
dsig_ctx.enableSignatureTransform(xmlsec.transformExclC14NId()) < 0
or dsig_ctx.enableSignatureTransform(xmlsec.transformSha1Id()) < 0
or dsig_ctx.enableSignatureTransform(
xmlsec.transformRsaSha1Id()) < 0):
print "Error: failed to limit allowed signature transforms"
return cleanup(doc, dsig_ctx)
if (dsig_ctx.enableReferenceTransform(xmlsec.transformInclC14NId()) < 0 or
dsig_ctx.enableReferenceTransform(xmlsec.transformExclC14NId()) < 0
or dsig_ctx.enableReferenceTransform(xmlsec.transformSha1Id()) < 0
or dsig_ctx.enableReferenceTransform(
xmlsec.transformEnvelopedId()) < 0):
print "Error: failed to limit allowed reference transforms"
return cleanup(doc, dsig_ctx)
# In addition, limit possible key data to valid X509 certificates only
if dsig_ctx.keyInfoReadCtx.enabledKeyData.add(xmlsec.keyDataX509Id()) < 0:
print "Error: failed to limit allowed key data"
return cleanup(doc, dsig_ctx)
# Verify signature
if dsig_ctx.verify(node) < 0:
print "Error: signature verify"
return cleanup(doc, dsig_ctx)
# Check that we have only one Reference
if (dsig_ctx.status == xmlsec.DSigStatusSucceeded
and dsig_ctx.signedInfoReferences.getSize() != 1):
print "Error: only one reference is allowed"
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 assina_xml(self, xml):
self._inicia_funcoes_externas()
xml = self._prepara_doc_xml(xml)
#
# Colocamos o texto no avaliador XML
#
doc_xml = libxml2.parseMemory(xml.encode('utf-8'),
len(xml.encode('utf-8')))
#
# Separa o nó da assinatura
#
noh_assinatura = xmlsec.findNode(doc_xml.getRootElement(),
xmlsec.NodeSignature, xmlsec.DSigNs)
#
# Arquivos temporários são criados com o certificado no formato PEM
#
temp_chave = tempfile.NamedTemporaryFile('w')
temp_chave.write(self.chave)
temp_chave.flush()
temp_certificado = tempfile.NamedTemporaryFile('w')
temp_certificado.write(self.certificado)
temp_certificado.flush()
#
# Buscamos chave e certificado no arquivo temporário e inserimos no "chaveiro"
#
chaveiro = xmlsec.KeysMngr()
xmlsec.cryptoAppDefaultKeysMngrInit(chaveiro)
chave = xmlsec.cryptoAppKeyLoad(filename=temp_chave.name,
format=xmlsec.KeyDataFormatPem,
pwd=None,
pwdCallback=None,
pwdCallbackCtx=None)
certificado = xmlsec.cryptoAppKeyCertLoad(
chave,
filename=temp_certificado.name,
format=xmlsec.KeyDataFormatPem)
xmlsec.cryptoAppDefaultKeysMngrAdoptKey(chaveiro, chave)
#
# Cria a variável de chamada (callable) da função de assinatura, usando o "chaveiro"
#
assinador = xmlsec.DSigCtx(chaveiro)
#
# Atribui a chave ao assinador
#
assinador.signKey = chave
#
# Realiza a assinatura
#
assinador.sign(noh_assinatura)
#
# Guarda o status
#
status = assinador.status
#
# Libera a memória ocupada pelo assinador manualmente
#
assinador.destroy()
#
# Arquivos temporários são deletados do disco
#
temp_chave.close()
temp_certificado.close()
if status != xmlsec.DSigStatusSucceeded:
#
# Libera a memória ocupada pelo documento xml manualmente
#
doc_xml.freeDoc()
self._finaliza_funcoes_externas()
raise RuntimeError(
'Erro ao realizar a assinatura do arquivo; status: "' +
str(status) + '"')
#
# Elimina do xml assinado a cadeia certificadora, deixando somente
# o certificado que assinou o documento
#
xpath = doc_xml.xpathNewContext()
xpath.xpathRegisterNs(u'sig', NAMESPACE_SIG)
certificados = xpath.xpathEval(u'//sig:X509Data/sig:X509Certificate')
for i in range(len(certificados) - 1):
certificados[i].unlinkNode()
certificados[i].freeNode()
#
# Retransforma o documento xml em texto
#
xml = doc_xml.serialize()
#
# Libera a memória ocupada pelo documento xml manualmente
#
doc_xml.freeDoc()
self._finaliza_funcoes_externas()
xml = self._finaliza_xml(xml)
return xml
def __init__(self, plugin):
self.dsig_ctx = xmlsec.DSigCtx()
if self.dsig_ctx is None:
raise RuntimeError('failed to create signature context')
self.dsig_ctx.signKey = get_xmlsec_keyfile(plugin)
def verifica_assinatura_xml(self, xml):
self._inicia_funcoes_externas()
xml = self._prepara_doc_xml(xml)
#
# Colocamos o texto no avaliador XML
#
doc_xml = libxml2.parseMemory(xml.encode('utf-8'), len(xml.encode('utf-8')))
#
# Separa o nó da assinatura
#
noh_assinatura = xmlsec.findNode(doc_xml.getRootElement(), xmlsec.NodeSignature, xmlsec.DSigNs)
#
# Prepara o gerenciador dos certificados confiáveis para verificação
#
certificados_confiaveis = xmlsec.KeysMngr()
xmlsec.cryptoAppDefaultKeysMngrInit(certificados_confiaveis)
#
# Prepara a cadeia certificadora
#
certificados = os.listdir(DIRNAME + '/cadeia-certificadora/certificados')
certificados.sort()
for certificado in certificados:
certificados_confiaveis.certLoad(filename=str(DIRNAME + '/cadeia-certificadora/certificados/' + certificado), format=xmlsec.KeyDataFormatPem, type=xmlsec.KeyDataTypeTrusted)
#
# Cria a variável de chamada (callable) da função de assinatura/verificação,
# agora passando quais autoridades certificadoras são consideradas
# confiáveis
#
verificador = xmlsec.DSigCtx(certificados_confiaveis)
#
# Separa o certificado que assinou o arquivo, e prepara a instância
# com os dados desse certificado
#
certificado = xmlsec.findNode(noh_assinatura, xmlsec.NodeX509Certificate, xmlsec.DSigNs).content
self.prepara_certificado_txt(certificado)
#
# Recupera a chave do certificado que assinou o documento, e altera
# a data que será usada para fazer a verificação, para que a assinatura
# seja validada mesmo que o certificado já tenha expirado
# Para isso, define a data de validação para a data de início da validade
# do certificado
# Essa data deve ser informada como um inteiro tipo "unixtime"
#
noh_chave = xmlsec.findNode(noh_assinatura, xmlsec.NodeKeyInfo, xmlsec.DSigNs)
manipulador_chave = xmlsec.KeyInfoCtx(mngr=certificados_confiaveis)
manipulador_chave.certsVerificationTime = mktime(self.data_inicio_validade.timetuple())
#
# Cria uma chave vazia e recupera a chave, dizendo ao verificador que
# é essa a chave que deve ser usada na validação da assinatura
#
verificador.signKey = xmlsec.Key()
xmlsec.keyInfoNodeRead(noh_chave, verificador.signKey, manipulador_chave)
#
# Realiza a verificação
#
verificador.verify(noh_assinatura)
#
# Guarda o status
#
status = verificador.status
resultado = status == xmlsec.DSigStatusSucceeded
#
# Libera a memória ocupada pelo verificador manualmente
#
verificador.destroy()
certificados_confiaveis.destroy()
if status != xmlsec.DSigStatusSucceeded:
#
# Libera a memória ocupada pelo documento xml manualmente
#
doc_xml.freeDoc()
self._finaliza_funcoes_externas()
raise RuntimeError('Erro ao validar a assinatura do arquivo; status: "' + str(status) + '"')
#
# Libera a memória ocupada pelo documento xml manualmente
#
doc_xml.freeDoc()
self._finaliza_funcoes_externas()
return resultado
def sign_file(xml_file, key_file):
assert (xml_file)
assert (key_file)
# Load template
doc = libxml2.parseFile(xml_file)
if doc is None or doc.getRootElement() is None:
print "Error: unable to parse file \"%s\"" % xml_file
return cleanup(doc)
# Create signature template for RSA-SHA1 enveloped signature
signNode = xmlsec.TmplSignature(doc, xmlsec.transformExclC14NId(),
xmlsec.transformRsaSha1Id(), None)
if signNode is None:
print "Error: failed to create signature template"
return cleanup(doc)
# Add <dsig:Signature/> node to the doc
doc.getRootElement().addChild(signNode)
# Add reference
refNode = signNode.addReference(xmlsec.transformSha1Id(), None, None, None)
if refNode is None:
print "Error: failed to add reference to signature template"
return cleanup(doc)
# Add enveloped transform
if refNode.addTransform(xmlsec.transformEnvelopedId()) is None:
print "Error: failed to add enveloped transform to reference"
return cleanup(doc)
# Add <dsig:KeyInfo/> and <dsig:KeyName/> nodes to put key name
# in the signed document
keyInfoNode = signNode.ensureKeyInfo(None)
if keyInfoNode is None:
print "Error: failed to add key info"
return cleanup(doc)
keyNameInfo = keyInfoNode.addKeyName(None)
if keyNameInfo is None:
print "Error: failed to add key name"
return cleanup(doc)
# Create signature context, we don't need keys manager in this example
dsig_ctx = xmlsec.DSigCtx()
if dsig_ctx is None:
print "Error: failed to create signature context"
return cleanup(doc)
# Load private key, assuming that there is not password
key = xmlsec.cryptoAppKeyLoad(key_file, xmlsec.KeyDataFormatPem, None,
None, None)
if key is None:
print "Error: failed to load private pem key from \"%s\"" % key_file
return cleanup(doc, dsig_ctx)
dsig_ctx.signKey = key
# Set key name to the file name, this is just an example!
if key.setName(key_file) < 0:
print "Error: failed to set key name for key from \"%s\"" % key_file
return cleanup(doc, dsig_ctx)
# Sign the template
if dsig_ctx.sign(signNode) < 0:
print "Error: signature failed"
return cleanup(doc, dsig_ctx)
# Print signed document to stdout
doc.dump("-")
# Success
return cleanup(doc, dsig_ctx, 1)
def signRequest(file, request, dtd="http://dmswww.stsci.edu/dtd/sso/distribution.dtd", cgi="https://archive.stsci.edu/cgi-bin/dads.cgi", mission='HST'):
global usexml
if usexml:
try:
keysmngr = xmlsec.KeysMngr()
if keysmngr is None:
raise RuntimeError("Error: failed to create keys manager.")
if xmlsec.cryptoAppDefaultKeysMngrInit(keysmngr) < 0:
keysmngr.destroy()
raise RuntimeError("Error: failed to initialize keys manager.")
key = xmlsec.cryptoAppKeyLoad(filename = file, pwd = None,
format = xmlsec.KeyDataFormatPem, pwdCallback = None,
pwdCallbackCtx = None)
if xmlsec.cryptoAppDefaultKeysMngrAdoptKey(keysmngr, key) < 0:
keysmngr.destroy()
raise RuntimeError("Error: failed to load key into keys manager")
dsig_ctx = xmlsec.DSigCtx(keysmngr)
# Match the dtd and replace it.
pat = re.compile("(^.*<!DOCTYPE.*distributionRequest[^>]*SYSTEM[ \t]*\")([^\"]*)(\"[^>]*>.*$)", re.DOTALL)
m = pat.match(request)
request = m.group(1)+dtd+m.group(3)
ctxt = libxml2.createMemoryParserCtxt(request, len(request))
ctxt.validate(1)
ctxt.parseDocument()
doc = ctxt.doc()
if doc is None or doc.getRootElement() is None:
keysmngr.destroy()
raise RuntimeError("Error: unable to parse XML data")
# find the XML-DSig start node
node = xmlsec.findNode(doc.getRootElement(), xmlsec.NodeSignature,
xmlsec.DSigNs)
if node is None:
fragment = libxml2.parseDoc("""<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
<Reference URI="#distributionRequest">
<Transforms>
<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
<Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#WithComments" />
</Transforms>
<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<DigestValue></DigestValue>
</Reference>
</SignedInfo>
<SignatureValue></SignatureValue>
<KeyInfo>
<KeyValue><RSAKeyValue>
<Modulus></Modulus>
<Exponent></Exponent>
</RSAKeyValue></KeyValue>
</KeyInfo>
</Signature>
""")
# remove the xml header on the front of the document fragment
fragment = fragment.getRootElement()
# getElementsByTagName doesn't exist here for some reason, have to use xpath
ctxt = doc.xpathNewContext()
nodeList = ctxt.xpathEval("/distributionRequest")
for child in nodeList:
child.addChild(fragment)
if child.prop('Id') == None:
child.setProp('Id', 'distributionRequest')
node = xmlsec.findNode(doc.getRootElement(), xmlsec.NodeSignature,
xmlsec.DSigNs)
# Remove passwords
ctxt = doc.xpathNewContext()
nodeList = ctxt.xpathEval('//requester')
for child in nodeList:
child.unsetProp('archivePassword')
nodeList = ctxt.xpathEval('//ftp')
for child in nodeList:
if child.hasProp('loginPassword'):
child.unsetProp('loginPassword')
warnings.warn('ftp password is not allowed in user requests.')
# Sign the template, or resign existing block
status = dsig_ctx.sign(node)
output = str(doc)
doc.freeDoc()
keysmngr.destroy()
if status < 0:
raise RuntimeError("Error: signature failed")
return output
except:
usexml=False
return signRequest(file, request, dtd, cgi)
else:
values = {'request' : request, 'privatekey' : open(file).read(), 'mission' : mission }
data = urlencode(values).encode("utf-8")
req = Request(url=cgi, data=data)
f = urlopen(req)
return f.read()
