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/*
* plugins/authdata/saml_client/saml_authdata.cpp
*
* Copyright 2009 by the Massachusetts Institute of Technology.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* Sample authorization data plugin
*/
#include <string.h>
#include <errno.h>
extern "C" {
#include "k5-int.h"
#include <krb5/authdata_plugin.h>
}
#include <saml/SAMLConfig.h>
#include <saml/saml2/metadata/Metadata.h>
#include <saml/saml2/metadata/MetadataProvider.h>
#include <saml/saml2/metadata/MetadataCredentialCriteria.h>
#include <saml/signature/SignatureProfileValidator.h>
#include <saml/util/SAMLConstants.h>
#include <xmltooling/logging.h>
#include <xmltooling/XMLToolingConfig.h>
#include <xmltooling/security/SignatureTrustEngine.h>
#include <xmltooling/security/OpenSSLCredential.h>
#include <xmltooling/signature/Signature.h>
#include <xmltooling/signature/SignatureValidator.h>
#include <xmltooling/util/XMLHelper.h>
#include <xsec/enc/XSECCryptoKeyHMAC.hpp>
#include <xsec/enc/OpenSSL/OpenSSLCryptoKeyHMAC.hpp>
#include <xsec/enc/XSECCryptoException.hpp>
#include <xsec/framework/XSECException.hpp>
using namespace xmlsignature;
using namespace xmlconstants;
using namespace xmltooling::logging;
using namespace xmltooling;
using namespace samlconstants;
using namespace opensaml::saml2md;
using namespace opensaml::saml2;
using namespace opensaml;
using namespace xercesc;
using namespace std;
struct saml_context {
saml2::Assertion *assertion;
krb5_boolean verified;
};
extern "C" {
static krb5_error_code
saml_init(krb5_context kcontext, void **plugin_context);
static void
saml_flags(krb5_context kcontext,
void *plugin_context,
krb5_authdatatype ad_type,
krb5_flags *flags);
static void
saml_fini(krb5_context kcontext, void *plugin_context);
static krb5_error_code
saml_request_init(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void **request_context);
static krb5_error_code
saml_export_authdata(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_flags usage,
krb5_authdata ***out_authdata);
static krb5_error_code
saml_import_authdata(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_authdata **authdata,
krb5_boolean kdc_issued_flag,
krb5_const_principal issuer);
static void
saml_request_fini(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context);
static krb5_error_code
saml_get_attribute_types(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_data **out_attrs);
static krb5_error_code
saml_get_attribute(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
const krb5_data *attribute,
krb5_boolean *authenticated,
krb5_boolean *complete,
krb5_data *value,
krb5_data *display_value,
int *more);
static krb5_error_code
saml_delete_attribute(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
const krb5_data *attribute);
static krb5_error_code
saml_size(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
size_t *sizep);
static krb5_error_code
saml_externalize(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_octet **buffer,
size_t *lenremain);
static krb5_error_code
saml_internalize(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_octet **buffer,
size_t *lenremain);
static krb5_error_code
saml_verify_authdata(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
const krb5_auth_context *auth_context,
const krb5_keyblock *key,
const krb5_ap_req *req);
static krb5_error_code
saml_copy(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
void *dst_plugin_context,
void *dst_request_context);
static void saml_library_init(void) __attribute__((__constructor__));
static void saml_library_fini(void) __attribute__((__destructor__));
}
static void saml_library_init(void)
{
SAMLConfig &config = SAMLConfig::getConfig();
XMLToolingConfig& xmlconf = XMLToolingConfig::getConfig();
if (getenv("SAML_DEBUG"))
xmlconf.log_config("DEBUG");
else
xmlconf.log_config();
config.init();
}
static void saml_library_fini(void)
{
SAMLConfig &config = SAMLConfig::getConfig();
config.term();
}
static krb5_error_code
saml_init(krb5_context kcontext, void **plugin_context)
{
return 0;
}
static void
saml_flags(krb5_context kcontext,
void *plugin_context,
krb5_authdatatype ad_type,
krb5_flags *flags)
{
*flags = AD_USAGE_TGS_REQ;
}
static void
saml_fini(krb5_context kcontext, void *plugin_context)
{
}
static krb5_error_code
saml_request_init(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void **request_context)
{
struct saml_context *sc;
sc = (struct saml_context *)calloc(1, sizeof(*sc));
if (sc == NULL)
return ENOMEM;
sc->verified = FALSE;
*request_context = sc;
return 0;
}
static krb5_error_code
saml_export_authdata(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_flags usage,
krb5_authdata ***out_authdata)
{
struct saml_context *sc = (struct saml_context *)request_context;
krb5_authdata *data[2];
krb5_authdata datum;
string buf;
if (sc->assertion == NULL)
return 0;
try {
XMLHelper::serialize(sc->assertion->marshall((DOMDocument *)NULL), buf);
} catch (XMLToolingException &e) {
return ASN1_PARSE_ERROR;
}
datum.ad_type = KRB5_AUTHDATA_SAML;
datum.length = buf.length();
datum.contents = (krb5_octet *)buf.c_str();
data[0] = &datum;
data[1] = NULL;
return krb5_copy_authdata(kcontext, data, out_authdata);
}
static krb5_error_code
saml_import_authdata(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_authdata **authdata,
krb5_boolean kdc_issued_flag,
krb5_const_principal issuer)
{
krb5_error_code code = 0;
struct saml_context *sc = (struct saml_context *)request_context;
string samlbuf((char *)authdata[0]->contents, authdata[0]->length);
istringstream samlin(samlbuf);
DOMDocument *doc = NULL;
DOMElement *elem = NULL;
const XMLObjectBuilder *b;
XMLObject *xobj;
assert(sc->verified == FALSE);
try {
doc = XMLToolingConfig::getConfig().getParser().parse(samlin);
b = XMLObjectBuilder::getDefaultBuilder();
elem = doc->getDocumentElement();
xobj = b->buildOneFromElement(elem, true);
#if 0
sc->assertion = dynamic_cast<saml2::Assertion*>(xobj);
if (sc->assertion == NULL) {
fprintf(stderr, "%s\n", typeid(xobj).name());
delete xobj;
code = ASN1_PARSE_ERROR;
}
#else
sc->assertion = (saml2::Assertion*)((void *)xobj);
#endif
} catch (XMLToolingException &e) {
code = ASN1_PARSE_ERROR; /* XXX */
}
return code;
}
static krb5_boolean
saml_compare_subject(krb5_context kcontext,
Subject *subject,
krb5_const_principal principal)
{
NameID *nameID = subject->getNameID();
char *sname;
krb5_error_code ret;
krb5_principal sprinc;
if (nameID == NULL)
return FALSE;
if (!XMLString::equals(nameID->getFormat(), NameIDType::KERBEROS))
return FALSE;
if (!nameID->getName())
return FALSE;
sname = toUTF8(nameID->getName());
if (sname == NULL)
return FALSE;
if (krb5_parse_name(kcontext, sname, &sprinc) == 0)
ret = krb5_principal_compare(kcontext, sprinc, principal);
else
ret = FALSE;
delete sname;
return ret;
}
static krb5_timestamp
saml_get_authtime(krb5_context kcontext,
saml2::Assertion *assertion)
{
krb5_timestamp ktime = 0;
const AuthnStatement *statement;
if (assertion->getAuthnStatements().size() == 1) {
statement = assertion->getAuthnStatements().front();
ktime = statement->getAuthnInstant()->getEpoch(false);
}
return ktime;
}
static krb5_error_code
saml_verify_authdata(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
const krb5_auth_context *auth_context,
const krb5_keyblock *key,
const krb5_ap_req *req)
{
krb5_error_code code;
struct saml_context *sc = (struct saml_context *)request_context;
krb5_keyblock *skey = req->ticket->enc_part2->session;
if (sc->assertion == NULL)
return EINVAL;
try {
OpenSSLCryptoKeyHMAC xkey;
Signature *signature = sc->assertion->getSignature();
DSIGSignature *dsig = signature->getXMLSignature();
if (dsig == NULL)
return KRB5KRB_AP_ERR_BAD_INTEGRITY;
xkey.setKey(skey->contents, skey->length);
dsig->setSigningKey(xkey.clone());
if (dsig->verify())
code = 0;
else
code = KRB5KRB_AP_ERR_BAD_INTEGRITY;
} catch (XSECException &e) {
code = KRB5KRB_AP_ERR_BAD_INTEGRITY;
} catch (XSECCryptoException &e) {
code = KRB5KRB_AP_ERR_BAD_INTEGRITY;
}
if (code == 0) {
krb5_timestamp authtime;
authtime = req->ticket->enc_part2->times.authtime;
if (saml_get_authtime(kcontext, sc->assertion) != authtime ||
saml_compare_subject(kcontext, sc->assertion->getSubject(),
req->ticket->enc_part2->client) == FALSE)
code = KRB5KRB_AP_WRONG_PRINC;
}
sc->verified = (code == 0);
return 0;
}
static void
saml_request_fini(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context)
{
struct saml_context *sc = (struct saml_context *)request_context;
if (sc != NULL) {
delete sc->assertion;
free(sc);
}
}
static krb5_error_code
saml_get_attribute_types(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_data **out_attrs)
{
krb5_error_code code;
struct saml_context *sc = (struct saml_context *)request_context;
saml2::Assertion *token2 = sc->assertion;
size_t nattrs, i = 0;
krb5_data *attrs;
if (token2 == NULL)
return EINVAL;
if (token2->getAttributeStatements().size() == 0)
return ENOENT;
nattrs = token2->getAttributeStatements().front()->getAttributes().size();
attrs = (krb5_data *)k5alloc((nattrs + 1) * sizeof(krb5_data), &code);
if (code != 0)
return code;
const vector<saml2::Attribute*>& attrs2 =
const_cast<const saml2::AttributeStatement*>(token2->getAttributeStatements().front())->getAttributes();
for (vector<saml2::Attribute*>::const_iterator a = attrs2.begin();
a != attrs2.end();
++a)
{
krb5_data *d = &attrs[i++];
d->magic = KV5M_DATA;
d->data = toUTF8((*a)->getName(), true);
d->length = strlen(d->data);
}
assert(i == nattrs);
attrs[i].data = NULL;
attrs[i].length = 0;
*out_attrs = attrs;
return 0;
}
static const saml2::Attribute *
saml_get_attribute_object(krb5_context context,
struct saml_context *sc,
const krb5_data *name)
{
saml2::Assertion *token2 = sc->assertion;
auto_ptr_XMLCh desiredName(name->data, name->length);
if (token2->getAttributeStatements().size() == 0)
return NULL;
const vector<saml2::Attribute*>& attrs2 =
const_cast<const saml2::AttributeStatement*>(token2->getAttributeStatements().front())->getAttributes();
for (vector<saml2::Attribute*>::const_iterator a = attrs2.begin();
a != attrs2.end();
++a) {
if (XMLString::equals((*a)->getName(), desiredName.get()))
return (*a);
}
return NULL;
}
static int
saml_get_attribute_index(krb5_context context,
AttributeStatement *statement,
const krb5_data *name)
{
auto_ptr_XMLCh desiredName(name->data, name->length);
int index = 0;
const vector<saml2::Attribute*>& attrs2 =
const_cast<const saml2::AttributeStatement*>(statement)->getAttributes();
for (vector<saml2::Attribute*>::const_iterator a = attrs2.begin();
a != attrs2.end();
++a) {
if (XMLString::equals((*a)->getName(), desiredName.get()))
return index;
++index;
}
return -1;
}
static krb5_error_code
saml_get_attribute_value(krb5_context context,
struct saml_context *sc,
const Attribute *attr,
krb5_boolean *authenticated,
krb5_boolean *complete,
krb5_data *value,
krb5_data *display_value,
int *more)
{
const AttributeValue *av;
int nvalues = attr->getAttributeValues().size();
/*
* On the first call, *more is -1. If there are more values,
* it is set to the index of the next value to return. On
* the last value, it is set to zero.
*/
if (*more == -1)
*more = 0;
else if (*more >= nvalues) {
*more = 0;
return ENOENT;
}
// av = dynamic_cast<const AttributeValue *>(attr->getAttributeValues().at(*more));
av = (const AttributeValue *)((void *)attr->getAttributeValues().at(*more));
if (av == NULL) {
*more = 0;
return ENOENT;
}
*authenticated = sc->verified; /* XXX */
*complete = TRUE; /* XXX */
value->data = toUTF8(av->getTextContent(), true);
value->length = strlen(value->data);
display_value->data = toUTF8(av->getTextContent(), true);
display_value->length = strlen(display_value->data);
if (nvalues > *more + 1)
(*more)++;
else
*more = 0;
return 0;
}
static krb5_error_code
saml_get_attribute(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
const krb5_data *attribute,
krb5_boolean *authenticated,
krb5_boolean *complete,
krb5_data *value,
krb5_data *display_value,
int *more)
{
krb5_error_code code;
struct saml_context *sc = (struct saml_context *)request_context;
const Attribute *attr;
if (sc->assertion == NULL)
return EINVAL;
attr = saml_get_attribute_object(kcontext, sc, attribute);
if (attr == NULL) {
assert(0);
return ENOENT;
}
code = saml_get_attribute_value(kcontext, sc, attr,
authenticated, complete,
value, display_value, more);
return code;
}
static krb5_error_code
saml_set_attribute(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_boolean complete,
const krb5_data *attribute,
const krb5_data *value)
{
struct saml_context *sc = (struct saml_context *)request_context;
Attribute *attr;
AttributeValue *attrValue;
auto_ptr_XMLCh canonicalName(attribute->data, attribute->length);
auto_ptr_XMLCh valueString(value->data, value->length);
attr = AttributeBuilder::buildAttribute();
attr->setNameFormat(Attribute::URI_REFERENCE);
attr->setName(canonicalName.get());
attrValue = AttributeValueBuilder::buildAttributeValue();
attrValue->setTextContent(valueString.get());
attr->getAttributeValues().push_back(attrValue);
if (sc->assertion == NULL) {
/* XXX this is probably not what we want to be doing */
AttributeStatement *attrStatement;
attrStatement = AttributeStatementBuilder::buildAttributeStatement();
attrStatement->getAttributes().push_back(attr);
sc->assertion = AssertionBuilder::buildAssertion();
sc->assertion->getAttributeStatements().push_back(attrStatement);
}
return 0;
}
static krb5_error_code
saml_delete_attribute(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
const krb5_data *attribute)
{
struct saml_context *sc = (struct saml_context *)request_context;
saml2::Assertion *token2 = sc->assertion;
auto_ptr_XMLCh desiredName(attribute->data, attribute->length);
saml2::AttributeStatement *attrStatement;
int index;
if (token2 == NULL)
return ENOENT;
if (token2->getAttributeStatements().size() == 0)
return ENOENT;
attrStatement = (saml2::AttributeStatement *)token2->getAttributeStatements().front();
index = saml_get_attribute_index(kcontext, attrStatement, attribute);
if (index == -1)
return ENOENT;
attrStatement->getAttributes().erase(
attrStatement->getAttributes().begin() + index);
sc->verified = FALSE;
return 0;
}
static krb5_error_code
saml_size(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
size_t *sizep)
{
struct saml_context *sc = (struct saml_context *)request_context;
string buf;
try {
XMLHelper::serialize(sc->assertion->marshall((DOMDocument *)NULL), buf);
} catch (XMLToolingException &e) {
return ASN1_PARSE_ERROR;
}
*sizep += sizeof(krb5_int32) + buf.length() + sizeof(krb5_int32);
return 0;
}
static krb5_error_code
saml_externalize(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_octet **buffer,
size_t *lenremain)
{
struct saml_context *sc = (struct saml_context *)request_context;
string buf;
try {
XMLHelper::serialize(sc->assertion->marshall((DOMDocument *)NULL), buf);
} catch (XMLToolingException &e) {
return ASN1_PARSE_ERROR;
}
if (*lenremain < sizeof(krb5_int32) + buf.length() + sizeof(krb5_int32))
return ENOMEM;
krb5_ser_pack_int32(buf.length(), buffer, lenremain);
krb5_ser_pack_bytes((krb5_octet *)buf.c_str(), buf.length(),
buffer, lenremain);
krb5_ser_pack_int32((krb5_int32)sc->verified, buffer, lenremain);
return 0;
}
static krb5_error_code
saml_internalize(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_octet **buffer,
size_t *lenremain)
{
struct saml_context *sc = (struct saml_context *)request_context;
krb5_error_code code;
krb5_int32 length;
krb5_octet *contents = NULL;
krb5_int32 verified;
krb5_octet *bp;
size_t remain;
bp = *buffer;
remain = *lenremain;
code = krb5_ser_unpack_int32(&length, &bp, &remain);
if (code != 0)
return code;
if (length != 0) {
krb5_authdata ad_datum, *ad_data[2];
ad_datum.contents = bp;
ad_datum.length = length;
ad_data[0] = &ad_datum;
ad_data[1] = NULL;
if (remain < (size_t)length)
return ENOMEM;
code = saml_import_authdata(kcontext, context,
plugin_context, request_context,
ad_data, FALSE, NULL);
if (code != 0)
return code;
bp += length;
remain -= length;
}
/* Verified */
code = krb5_ser_unpack_int32(&verified, &bp, &remain);
if (code != 0) {
free(contents);
return code;
}
sc->verified = (verified != 0);
*buffer = bp;
*lenremain = remain;
return 0;
}
static krb5_error_code
saml_copy(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
void *dst_plugin_context,
void *dst_request_context)
{
struct saml_context *src = (struct saml_context *)request_context;
struct saml_context *dst = (struct saml_context *)dst_request_context;
if (src->assertion != NULL)
dst->assertion = (saml2::Assertion *)((void *)src->assertion->clone());
dst->verified = src->verified;
assert(dst->assertion != NULL);
return 0;
}
static krb5_authdatatype saml_ad_types[] = { KRB5_AUTHDATA_SAML, 0 };
krb5plugin_authdata_client_ftable_v0 authdata_client_0 = {
"saml",
saml_ad_types,
saml_init,
saml_fini,
saml_flags,
saml_request_init,
saml_request_fini,
saml_get_attribute_types,
saml_get_attribute,
saml_set_attribute,
saml_delete_attribute,
saml_export_authdata,
saml_import_authdata,
NULL,
NULL,
saml_verify_authdata,
saml_size,
saml_externalize,
saml_internalize,
saml_copy
};
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