311 lines
13 KiB
C
311 lines
13 KiB
C
/***********************************************************************
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*
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* Copyright (C) 2005-2006 Novell, Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, Novell, Inc.
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*
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* To contact Novell about this file by physical or electronic mail,
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* you may find current contact information at www.novell.com.
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*
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***********************************************************************/
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//===[ Include files ]=====================================================
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#include "internal.h"
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//===[ Type definitions ]==================================================
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//===[ Function prototypes ]===============================================
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//===[ Global variables ]==================================================
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//++=======================================================================
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CasaStatus SSCS_CALL
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Krb5AuthTokenIf_GetAuthTokenCredentials(
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IN const void *pIfInstance,
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IN const ConfigIf *pServiceConfigIf,
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INOUT const char *pUserNameBuf,
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INOUT int *pUserNameBufLen,
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INOUT const char *pTokenBuf,
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INOUT int *pTokenBufLen)
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//
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// Arguments:
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// pIfInstance -
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// Pointer to interface object.
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//
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// pServiceConfigIf -
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// Pointer to service config object to which the client is trying to
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// authenticate.
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//
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// pUserNameBuf -
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// Pointer to buffer that will receive a string with the
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// username that should used when authenticating to the
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// service. The length of this buffer is specified by the
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// pUserNameBufLen parameter. Note that the string
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// returned will be NULL terminated.
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//
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// pUserNameBufLen -
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// Pointer to integer that contains the length of the
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// buffer pointed at by pUserNameBuf. Upon return of the
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// function, the integer will contain the actual length
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// of the username string (including the NULL terminator)
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// if the function successfully completes or the buffer
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// length required if the function fails because the buffer
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// pointed at by either pUserNameBuf or pTokenBuf is not
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// large enough.
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//
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// pTokenBuf -
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// Pointer to buffer that will receive the authentication
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// token. The length of this buffer is specified by the
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// pTokenBufLen parameter. Note that the the authentication
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// token will be in the form of a NULL terminated string.
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//
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// pTokenBufLen -
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// Pointer to integer that contains the length of the
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// buffer pointed at by pTokenBuf. Upon return of the
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// function, the integer will contain the actual length
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// of the authentication token if the function successfully
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// completes or the buffer length required if the function
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// fails because the buffer pointed at by either pUserNameBuf
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// or pTokenBuf is not large enough.
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//
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// Returns:
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// Casa Status
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//
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// Description:
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// Get authentication token credentials to authenticate user to specified
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// service.
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//
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// L2
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//=======================================================================--
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{
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CasaStatus retStatus;
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OM_uint32 gssMajStat;
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OM_uint32 gssMinStat;
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char *pKrbServiceName;
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DbgTrace(1, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- Start\n", 0);
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// Validate input parameters
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if (pIfInstance == NULL
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|| pServiceConfigIf == NULL
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|| pUserNameBufLen == NULL
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|| (pUserNameBuf == NULL && *pUserNameBufLen != 0)
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|| pTokenBufLen == NULL
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|| (pTokenBuf == NULL && *pTokenBufLen != 0))
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{
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DbgTrace(0, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- Invalid input parameter\n", 0);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_KRB5TOKEN,
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CASA_STATUS_INVALID_PARAMETER);
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goto exit;
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}
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// Map service name to Krb Service Principal Name
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pKrbServiceName = pServiceConfigIf->getEntryValue(pServiceConfigIf, "KerberosPrincipal");
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if (pKrbServiceName)
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{
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gss_buffer_desc gssBuffer;
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gss_name_t gssServiceName;
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// Import the service principal name into something that
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// GSS-API can understand based on its form.
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gssBuffer.value = (void*) pKrbServiceName;
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gssBuffer.length = strlen(pKrbServiceName) + 1;
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if (strchr(pKrbServiceName, '@') != NULL)
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{
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// The name is of the form "servicename@hostname"
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gssMajStat = gss_import_name(&gssMinStat,
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&gssBuffer,
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(gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
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&gssServiceName);
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}
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else
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{
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// The name is of the form "servicename"
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gssMajStat = gss_import_name(&gssMinStat,
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&gssBuffer,
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(gss_OID) GSS_C_NT_USER_NAME,
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&gssServiceName);
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}
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// Proceed based on the result of the name import operation
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if (gssMajStat == GSS_S_COMPLETE)
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{
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// Establish a context
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gss_ctx_id_t gssContext = GSS_C_NO_CONTEXT;
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gss_buffer_desc gssSendToken = {0};
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OM_uint32 gssRetFlags;
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gssMajStat = gss_init_sec_context(&gssMinStat,
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GSS_C_NO_CREDENTIAL,
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&gssContext,
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gssServiceName,
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g_mechOid,
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0, // Flags
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0,
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NULL, // no channel bindings
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GSS_C_NO_BUFFER, // no token from peer
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NULL, // ignore mech type
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&gssSendToken,
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&gssRetFlags,
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NULL); // ignore time rec
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// Proceed based on the result of the gss_init_sec_context operation
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if (gssMajStat == GSS_S_COMPLETE
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&& gssSendToken.length != 0)
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{
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// Now get the username
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gss_name_t gssClient;
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gssMajStat = gss_inquire_context(&gssMinStat,
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gssContext,
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&gssClient,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL);
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if (gssMajStat == GSS_S_COMPLETE)
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{
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gss_buffer_desc gssDisplayName;
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gss_OID gssNameType;
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gssMajStat = gss_display_name(&gssMinStat, gssClient, &gssDisplayName, &gssNameType);
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if (gssMajStat == GSS_S_COMPLETE)
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{
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char *pEncodedToken;
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int encodedTokenLen;
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// Base64 encode the token
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retStatus = EncodeData(gssSendToken.value,
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gssSendToken.length,
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&pEncodedToken,
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&encodedTokenLen);
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if (CASA_SUCCESS(retStatus))
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{
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// Verify that the caller provided buffers that are big enough
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if (gssDisplayName.length > *pUserNameBufLen
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|| encodedTokenLen > *pTokenBufLen)
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{
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// At least one of the supplied buffers is not big enough
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DbgTrace(1, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- Insufficient buffer space provided\n", 0);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_KRB5TOKEN,
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CASA_STATUS_BUFFER_OVERFLOW);
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}
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else
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{
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// The buffers provided are large enough, copy the data and return the actual sizes.
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memcpy((void*) pUserNameBuf, gssDisplayName.value, gssDisplayName.length + 1);
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memcpy((void*) pTokenBuf, pEncodedToken, encodedTokenLen +1);
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// Success
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retStatus = CASA_STATUS_SUCCESS;
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}
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// Return the actual sizes or the sizes required
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*pUserNameBufLen = gssDisplayName.length + 1;
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*pTokenBufLen = encodedTokenLen;
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// Free the buffer containing the encoded token
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free(pEncodedToken);
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}
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else
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{
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DbgTrace(1, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- Encoding failed\n", 0);
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}
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// Release the buffer associated with the client display name
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gss_release_buffer(&gssMinStat, &gssDisplayName);
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}
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else
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{
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DbgTrace(0, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- Error obtaining display name\n", 0);
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LogGssStatuses("obtaining display name", gssMajStat, gssMinStat);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_KRB5TOKEN,
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CASA_STATUS_UNSUCCESSFUL);
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}
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}
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else
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{
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DbgTrace(0, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- Error inquiring context\n", 0);
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LogGssStatuses("inquiring context", gssMajStat, gssMinStat);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_KRB5TOKEN,
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CASA_STATUS_UNSUCCESSFUL);
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}
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}
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else
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{
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DbgTrace(0, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- Error initing sec context\n", 0);
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LogGssStatuses("initializing context", gssMajStat, gssMinStat);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_KRB5TOKEN,
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CASA_STATUS_UNSUCCESSFUL);
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}
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// Release send token buffer if necessary
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if (gssSendToken.length != 0)
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gss_release_buffer(&gssMinStat, &gssSendToken);
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// Free context if necessary
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if (gssContext != GSS_C_NO_CONTEXT)
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gss_delete_sec_context(&gssMinStat, &gssContext, GSS_C_NO_BUFFER);
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// Release the buffer associated with the service name
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gss_release_name(&gssMinStat, &gssServiceName);
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}
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else
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{
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DbgTrace(0, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- Error importing service name\n", 0);
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LogGssStatuses("importing service name", gssMajStat, gssMinStat);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_KRB5TOKEN,
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CASA_STATUS_OBJECT_NOT_FOUND);
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}
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// Free the krb service principal name
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free(pKrbServiceName);
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}
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else
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{
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DbgTrace(0, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- No Kerberos principal name configured\n", 0);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_KRB5TOKEN,
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CASA_STATUS_CONFIGURATION_ERROR);
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}
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exit:
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DbgTrace(1, "krb5_token -Krb5AuthTokenIf_GetAuthTokenCredentials- End, retStatus = %08X\n", retStatus);
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return retStatus;
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}
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//++=======================================================================
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//++=======================================================================
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//++=======================================================================
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