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CASA/auth_token/client/authpolicy.c
Juan Carlos Luciani fe756d9f5e Changes due to continue development effort.
2006-04-28 18:58:25 +00:00

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/***********************************************************************
*
* Copyright (C) 2006 Novell, Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, Novell, Inc.
*
* To contact Novell about this file by physical or electronic mail,
* you may find current contact information at www.novell.com.
*
* Author: Juan Carlos Luciani <jluciani@novell.com>
*
***********************************************************************/
//===[ Include files ]=====================================================
#include "internal.h"
//===[ Type definitions ]==================================================
//
// Parse states
//
#define AWAITING_ROOT_ELEMENT_START 0x0
#define AWAITING_ROOT_ELEMENT_END 0x1
#define AWAITING_AUTH_POLICY_ELEMENT_START 0x2
#define AWAITING_AUTH_POLICY_ELEMENT_END 0x3
#define AWAITING_AUTH_POLICY_DATA 0x4
#define AWAITING_AUTH_SOURCE_ELEMENT_START 0x5
#define AWAITING_AUTH_SOURCE_ELEMENT_END 0x6
#define AWAITING_AUTH_SOURCE_CHILD_START 0x7
#define AWAITING_REALM_DATA 0x8
#define AWAITING_REALM_ELEMENT_END 0x9
#define AWAITING_MECHANISM_DATA 0xA
#define AWAITING_MECHANISM_ELEMENT_END 0xB
#define AWAITING_MECHANISM_INFO_DATA 0xC
#define AWAITING_MECHANISM_INFO_ELEMENT_END 0xD
#define AWAITING_UNKNOWN_DATA 0xE
#define AWAITING_UNKNOWN_ELEMENT_END 0xF
#define DONE_PARSING 0x10
//
// Authentication Policy Parse Structure
//
typedef struct _AuthPolicyParse
{
XML_Parser p;
int state;
int elementDataProcessed;
AuthPolicy *pAuthPolicy;
CasaStatus status;
} AuthPolicyParse, *PAuthPolicyParse;
//===[ Function prototypes ]===============================================
//===[ Global variables ]==================================================
//++=======================================================================
static
void XMLCALL
AuthPolicyStartElementHandler(
IN AuthPolicyParse *pAuthPolicyParse,
IN const XML_Char *name,
IN const XML_Char **atts)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
DbgTrace(2, "-AuthPolicyStartElementHandler- Start\n", 0);
// Proceed based on the state
switch (pAuthPolicyParse->state)
{
case AWAITING_ROOT_ELEMENT_START:
// In this state, we are only expecting the Authentication
// Policy Element.
if (strcmp(name, AUTH_POLICY_ELEMENT_NAME) == 0)
{
// Good, advance to the next state.
pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_ELEMENT_START;
}
else
{
DbgTrace(0, "-AuthPolicyStartElementHandler- Un-expected start element\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_AUTH_SOURCE_ELEMENT_START:
case AWAITING_ROOT_ELEMENT_END:
// In this state, we are only expecting the start of an Authentication
// Source Element.
if (strcmp(name, AUTH_SOURCE_ELEMENT_NAME) == 0)
{
AuthContext *pAuthContext;
// Create an authentication context structure
pAuthContext = (AuthContext*) malloc(sizeof(AuthContext));
if (pAuthContext)
{
// Initialize the allocated AuthContext structure and associate it
// with the AuthPolicy structure.
memset(pAuthContext, 0, sizeof(*pAuthContext));
InsertTailList(&pAuthPolicyParse->pAuthPolicy->authContextListHead, &pAuthContext->listEntry);
// Good, advance to the next state.
pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
}
else
{
DbgTrace(0, "-AuthPolicyStartElementHandler- Buffer allocation error\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
}
else
{
DbgTrace(0, "-AuthPolicyStartElementHandler- Un-expected start element\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_AUTH_SOURCE_CHILD_START:
// Proceed based on the name of the element
if (strcmp(name, REALM_ELEMENT_NAME) == 0)
{
// Advance to the next state.
pAuthPolicyParse->state = AWAITING_REALM_DATA;
}
else if (strcmp(name, MECHANISM_ELEMENT_NAME) == 0)
{
// Advance to the next state.
pAuthPolicyParse->state = AWAITING_MECHANISM_DATA;
}
else if (strcmp(name, MECHANISM_INFO_ELEMENT_NAME) == 0)
{
// Advance to the next state.
pAuthPolicyParse->state = AWAITING_MECHANISM_INFO_DATA;
}
else if (strcmp(name, AUTH_SOURCE_ELEMENT_NAME) == 0)
{
// We are starting a new auth source entry, create an authentication
// context structure to hold its information.
AuthContext *pAuthContext;
// Create an authentication context structure
pAuthContext = (AuthContext*) malloc(sizeof(AuthContext));
if (pAuthContext)
{
// Initialize the allocated AuthContext structure and associate it
// with the AuthPolicy structure.
memset(pAuthContext, 0, sizeof(*pAuthContext));
InsertTailList(&pAuthPolicyParse->pAuthPolicy->authContextListHead, &pAuthContext->listEntry);
}
else
{
DbgTrace(0, "-AuthPolicyStartElementHandler- Buffer allocation error\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
}
else
{
// Advance to the next state.
pAuthPolicyParse->state = AWAITING_UNKNOWN_DATA;
}
break;
default:
DbgTrace(0, "-AuthPolicyStartElementHandler- Un-expected state = %d\n", pAuthPolicyParse->state);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
break;
}
DbgTrace(2, "-AuthPolicyStartElementHandler- End\n", 0);
}
//++=======================================================================
static
CasaStatus
ConsumeElementData(
IN AuthPolicyParse *pAuthPolicyParse,
IN const XML_Char *s,
IN int len,
INOUT char **ppElementData,
INOUT int *pElementDataLen)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
CasaStatus retStatus = CASA_STATUS_SUCCESS;
DbgTrace(3, "-ConsumeElementData- Start\n", 0);
// Proceed based on whether or not we have already consumed data
// for this element.
if (*ppElementData == NULL)
{
// We have not yet consumed data for this element
pAuthPolicyParse->elementDataProcessed = len;
// Allocate a buffer to hold this element data (null terminated).
*ppElementData = (char*) malloc(len + 1);
if (*ppElementData)
{
memset(*ppElementData, 0, len + 1);
memcpy(*ppElementData, s, len);
// Return the length of the element data buffer
*pElementDataLen = pAuthPolicyParse->elementDataProcessed + 1;
}
else
{
DbgTrace(0, "-ConsumeElementData- Buffer allocation failure\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
}
else
{
char *pNewBuf;
// We have already received token data, append this data to it.
pNewBuf = (char*) malloc(pAuthPolicyParse->elementDataProcessed + len + 1);
if (pNewBuf)
{
memset(pNewBuf,
0,
pAuthPolicyParse->elementDataProcessed + len + 1);
memcpy(pNewBuf,
*ppElementData,
pAuthPolicyParse->elementDataProcessed);
memcpy(pNewBuf + pAuthPolicyParse->elementDataProcessed, s, len);
pAuthPolicyParse->elementDataProcessed += len;
// Swap the buffers
free(*ppElementData);
*ppElementData = pNewBuf;
// Return the length of the element data buffer
*pElementDataLen = pAuthPolicyParse->elementDataProcessed + 1;
}
else
{
DbgTrace(0, "-ConsumeElementData- Buffer allocation failure\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
}
DbgTrace(3, "-ConsumeElementData- End, retStatus = %08X\n", retStatus);
return retStatus;
}
//++=======================================================================
static
void XMLCALL
AuthPolicyCharDataHandler(
IN AuthPolicyParse *pAuthPolicyParse,
IN const XML_Char *s,
IN int len)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
AuthContext *pAuthContext;
DbgTrace(2, "-AuthPolicyCharDataHandler- Start\n", 0);
// Just exit if being called to process LF and CR characters
if (len == 1
&& ((*s == '\n') || (*s == '\r')))
{
goto exit;
}
// Proceed based on the state
switch (pAuthPolicyParse->state)
{
case AWAITING_REALM_DATA:
// Get access to the AuthContext at the tail of the list
pAuthContext = CONTAINING_RECORD(pAuthPolicyParse->pAuthPolicy->authContextListHead.Blink,
AuthContext,
listEntry);
// Consume the data
pAuthPolicyParse->status = ConsumeElementData(pAuthPolicyParse,
s,
len,
&pAuthContext->pContext,
&pAuthContext->contextLen);
if (CASA_SUCCESS(pAuthPolicyParse->status))
{
// Advanced to the next state
pAuthPolicyParse->state = AWAITING_REALM_ELEMENT_END;
}
else
{
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_MECHANISM_DATA:
// Get access to the AuthContext at the tail of the list
pAuthContext = CONTAINING_RECORD(pAuthPolicyParse->pAuthPolicy->authContextListHead.Blink,
AuthContext,
listEntry);
// Consume the data
pAuthPolicyParse->status = ConsumeElementData(pAuthPolicyParse,
s,
len,
&pAuthContext->pMechanism,
&pAuthContext->mechanismLen);
if (CASA_SUCCESS(pAuthPolicyParse->status))
{
// Advanced to the next state
pAuthPolicyParse->state = AWAITING_MECHANISM_ELEMENT_END;
}
else
{
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_MECHANISM_INFO_DATA:
// Get access to the AuthContext at the tail of the list
pAuthContext = CONTAINING_RECORD(pAuthPolicyParse->pAuthPolicy->authContextListHead.Blink,
AuthContext,
listEntry);
// Consume the data
pAuthPolicyParse->status = ConsumeElementData(pAuthPolicyParse,
s,
len,
&pAuthContext->pMechInfo,
&pAuthContext->mechInfoLen);
if (CASA_SUCCESS(pAuthPolicyParse->status))
{
// Advanced to the next state
pAuthPolicyParse->state = AWAITING_MECHANISM_INFO_ELEMENT_END;
}
else
{
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_UNKNOWN_DATA:
// Just advance the state
pAuthPolicyParse->state = AWAITING_UNKNOWN_ELEMENT_END;
break;
default:
DbgTrace(0, "-AuthPolicyCharDataHandler- Un-expected state = %d\n", pAuthPolicyParse->state);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
break;
}
exit:
DbgTrace(2, "-AuthPolicyCharDataHandler- End\n", 0);
}
//++=======================================================================
static
void XMLCALL
AuthPolicyEndElementHandler(
IN AuthPolicyParse *pAuthPolicyParse,
IN const XML_Char *name)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
AuthContext *pAuthContext;
DbgTrace(2, "-AuthPolicyEndElementHandler- Start\n", 0);
// Proceed based on the state
switch (pAuthPolicyParse->state)
{
case AWAITING_ROOT_ELEMENT_END:
// In this state, we are only expecting the Authentication
// Policy Element.
if (strcmp(name, AUTH_POLICY_ELEMENT_NAME) == 0)
{
// Done.
pAuthPolicyParse->state = DONE_PARSING;
}
else
{
DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected end element\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_AUTH_SOURCE_CHILD_START:
// In this state, we are only expecting the Authentication
// Source Response Element.
if (strcmp(name, AUTH_SOURCE_ELEMENT_NAME) == 0)
{
// Good, advance to the next state.
pAuthPolicyParse->state = AWAITING_ROOT_ELEMENT_END;
}
else
{
DbgTrace(0, "-AuthPolicyEndHandler- Un-expected end element\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_REALM_ELEMENT_END:
// In this state, we are only expecting the Realm Element.
if (strcmp(name, REALM_ELEMENT_NAME) == 0)
{
// Good, advance to the next state.
pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
}
else
{
DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected end element\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_MECHANISM_ELEMENT_END:
// In this state, we are only expecting the Mechanism Element.
if (strcmp(name, MECHANISM_ELEMENT_NAME) == 0)
{
// Good, advance to the next state.
pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
}
else
{
DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected end element\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_MECHANISM_INFO_DATA:
// Get access to the AuthContext at the tail of the list
pAuthContext = CONTAINING_RECORD(pAuthPolicyParse->pAuthPolicy->authContextListHead.Blink,
AuthContext,
listEntry);
// There was no mechanism info data. Set it to an empty string.
pAuthContext->pMechInfo = (char*) malloc(1);
if (pAuthContext->pMechInfo)
{
*pAuthContext->pMechInfo = '\0';
}
else
{
DbgTrace(0, "-AuthPolicyEndElementHandler- Buffer allocation failure\n", 0);
pAuthPolicyParse->status = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
break;
}
// Fall through
case AWAITING_MECHANISM_INFO_ELEMENT_END:
// In this state, we are only expecting the Mechanism Info Element.
if (strcmp(name, MECHANISM_INFO_ELEMENT_NAME) == 0)
{
// Good, advance to the next state.
pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
}
else
{
DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected end element\n", 0);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
}
break;
case AWAITING_UNKNOWN_ELEMENT_END:
// Advance to the next state.
pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
break;
default:
DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected state = %d\n", pAuthPolicyParse->state);
XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
break;
}
DbgTrace(2, "-AuthPolicyEndElementHandler- End\n", 0);
}
//++=======================================================================
CasaStatus
CreateAuthPolicy(
IN char *pEncodedData,
IN int encodedDataLen,
INOUT AuthPolicy **ppAuthPolicy)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
CasaStatus retStatus;
AuthPolicy *pAuthPolicy = NULL;
AuthPolicyParse authPolicyParse = {0};
char *pData = NULL;
int dataLen = 0;
DbgTrace(1, "-CreateAuthPolicy- Start\n", 0);
/*
* An authentication policy document has the following format:
*
* <?xml version="1.0" encoding="ISO-8859-1"?>
* <auth_policy>
* <auth_source>
* <realm>realm name</realm>
* <mechanism>authentication mechanism type</mechanism>
* <mechanism_info>authentication mechanism context data</mechanism_info>
* </auth_source>
* ...
* </auth_policy>
*
* The authentication policy document can contain multiple auth_source
* elements. These auth_source elements can be for different authentication
* sources or for the same authentication source but specifying a different
* authentication mechanism.
*
* The following is a sample authentication policy document:
*
* <?xml version="1.0" encoding="ISO-8859-1"?>
* <auth_policy>
* <auth_source>
* <realm>Corp_eDirTree</realm>
* <mechanism>Krb5Authenticate</mechanism>
* <mechanism_info>host/hostname</mechanism_info>
* </auth_source>
* <auth_source>
* <realm>Corp_eDirTree</realm>
* <mechanism>PwdAuthenticate</mechanism>
* <mechanism_info></mechanism_info>
* </auth_source>
* </auth_policy>
*
* This authentication policy would tell the CASA client that it can
* authenticate to the CASA Authentication Token Service using
* credentials for the Corp_eDirTree and utilizing either the
* Krb5 authentication mechanism or the Pwd authentication mechanism.
* The Krb5 authentication mechanism context data specifies the
* name of the Kerberos service principal.
*
*/
// Initialize output parameter
*ppAuthPolicy = NULL;
// Decode the data
retStatus = DecodeData(pEncodedData,
encodedDataLen,
&pData,
&dataLen);
if (CASA_SUCCESS(retStatus))
{
// Allocate space for the AuthPolicy structure
pAuthPolicy = (AuthPolicy*) malloc(sizeof(*pAuthPolicy));
if (pAuthPolicy)
{
XML_Parser p;
// Initialize the AuthPolicy object
memset(pAuthPolicy, 0, sizeof(*pAuthPolicy));
InitializeListHead(&pAuthPolicy->authContextListHead);
// Set the AuthPolicy object in the parse object
authPolicyParse.pAuthPolicy = pAuthPolicy;
// Create parser
p = XML_ParserCreate(NULL);
if (p)
{
// Keep track of the parser in our parse object
authPolicyParse.p = p;
// Initialize the status within the parse object
authPolicyParse.status = CASA_STATUS_SUCCESS;
// Set the start and end element handlers
XML_SetElementHandler(p,
AuthPolicyStartElementHandler,
AuthPolicyEndElementHandler);
// Set the character data handler
XML_SetCharacterDataHandler(p, AuthPolicyCharDataHandler);
// Set our user data
XML_SetUserData(p, &authPolicyParse);
// Parse the document
if (XML_Parse(p, pData, dataLen, 1) == XML_STATUS_OK)
{
// Verify that the parse operation completed successfully
if (authPolicyParse.state == DONE_PARSING)
{
// The parse operation succeded
retStatus = CASA_STATUS_SUCCESS;
}
else
{
DbgTrace(0, "-CreateAuthPolicy- Parse operation did not complete\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_PROTOCOL_ERROR);
}
}
else
{
DbgTrace(0, "-CreateAuthPolicy- Parse error %d\n", XML_GetErrorCode(p));
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_PROTOCOL_ERROR);
}
// Free the parser
XML_ParserFree(p);
}
else
{
DbgTrace(0, "-CreateAuthPolicy- Parser creation error\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
// Return the AuthPolicy object to the caller if necessary
if (CASA_SUCCESS(retStatus))
{
*ppAuthPolicy = pAuthPolicy;
// Forget about the AuthPolicy object so that it is not release down below
pAuthPolicy = NULL;
}
}
else
{
DbgTrace(0, "-CreateAuthPolicy- Buffer allocation error\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
}
else
{
DbgTrace(0, "-CreateAuthPolicy- Buffer allocation error\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
// Release necessary allocated resources
if (pAuthPolicy)
RelAuthPolicy(pAuthPolicy);
if (pData)
free(pData);
DbgTrace(1, "-CreateAuthPolicy- End, retStatus = %08X\n", retStatus);
return retStatus;
}
//++=======================================================================
void
RelAuthPolicy(
IN AuthPolicy *pAuthPolicy)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
LIST_ENTRY *pListEntry;
DbgTrace(1, "-RelAuthPolicy- Start\n", 0);
// Free all of the associated AuthContexts
pListEntry = pAuthPolicy->authContextListHead.Flink;
while (pListEntry != &pAuthPolicy->authContextListHead)
{
AuthContext *pAuthContext;
// Get pointer to AuthContext structure
pAuthContext = CONTAINING_RECORD(pListEntry, AuthContext, listEntry);
// Free associated buffers
if (pAuthContext->pContext)
free(pAuthContext->pContext);
if (pAuthContext->pMechanism)
free(pAuthContext->pMechanism);
if (pAuthContext->pMechInfo)
free(pAuthContext->pMechInfo);
// Remove the entry from the list
RemoveEntryList(&pAuthContext->listEntry);
// Free the AuthContext
free(pAuthContext);
// Advance to the next entry
pListEntry = pAuthPolicy->authContextListHead.Flink;
}
// Free the AuthPolicy
free(pAuthPolicy);
DbgTrace(1, "-RelAuthPolicy- End\n", 0);
}
//++=======================================================================
//++=======================================================================
//++=======================================================================
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