def parseString(s, plotter):
ctxt = libxml2.createMemoryParserCtxt(s, len(s))
#ctxt.replaceEntities(1)
#ctxt.loadSubset(1)
#ctxt.validate(1) # should be set to 0 for greater speed
ctxt.parseDocument()
if not ctxt.wellFormed():
print "Document not well formed!"
if not ctxt.isValid():
print "Document not valid!"
doc = ctxt.doc()
root = doc.children
assert root.name == 'math'
return parseTree(root, plotter)
def signRequest(file, request):
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)+"http://dmswww.stsci.edu/dtd/sso/distribution.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
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()
