160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/* $Id$
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*****************************************************************************
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*
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* File: fko_encode.c
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*
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* Author: Damien S. Stuart
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*
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* Purpose: Encodes some pieces of the spa data then puts together all of
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* the necessary pieces to gether to create the single encoded
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* message string.
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*
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* Copyright (C) 2008 Damien Stuart (dstuart@dstuart.org)
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*
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* License (GNU Public License):
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*****************************************************************************
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*/
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#include "fko_common.h"
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#include "fko.h"
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#include "base64.h"
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#include "digest.h"
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/* A rough way to make enough space for a base64 encoded version of
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* the given string, encode it, and return it.
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*/
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int append_b64(char* tbuf, char *str)
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{
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int len = strlen(str);
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char *bs;
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if((bs = malloc(((len/3)*4)+8)) == NULL)
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return(FKO_ERROR_MEMORY_ALLOCATION);
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b64_encode((unsigned char*)str, bs, len);
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/* --DSS XXX: make sure to check here if later decoding
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* becomes a problem.
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*/
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strip_b64_eq(bs);
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strlcat(tbuf, bs, FKO_ENCODE_TMP_BUF_SIZE);
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free(bs);
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return(FKO_SUCCESS);
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}
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/* Set the SPA encryption type.
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*/
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int fko_encode_spa_data(fko_ctx_t *ctx)
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{
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int res, offset = 0;
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char tbuf[FKO_ENCODE_TMP_BUF_SIZE] = {0};
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/* Must be initialized
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*/
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if(!CTX_INITIALIZED(ctx))
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return(FKO_ERROR_CTX_NOT_INITIALIZED);
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/* Check prerequisites.
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* --DSS XXX: Needs review. Also, we could make this more robust (or
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* (at leaset expand the error reporting for the missing
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* data).
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*/
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if( ctx->username == NULL || strlen(ctx->username) == 0
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|| ctx->version == NULL || strlen(ctx->version) == 0
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|| ctx->message == NULL || strlen(ctx->message) == 0)
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{
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return(FKO_ERROR_INCOMPLETE_SPA_DATA);
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}
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if(ctx->message_type == FKO_NAT_ACCESS_MSG)
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{
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if(ctx->nat_access == NULL || strlen(ctx->nat_access) == 0)
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return(FKO_ERROR_INCOMPLETE_SPA_DATA);
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}
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/* Put it together a piece at a time, starting with the rand val.
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*/
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strcpy(tbuf, ctx->rand_val);
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/* Add the base64-encoded username.
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*/
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strlcat(tbuf, ":", FKO_ENCODE_TMP_BUF_SIZE);
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if((res = append_b64(tbuf, ctx->username)) != FKO_SUCCESS)
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return(res);
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/* Add the timestamp.
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*/
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offset = strlen(tbuf);
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sprintf(((char*)tbuf+offset), ":%u:", ctx->timestamp);
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/* Add the version string.
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*/
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strlcat(tbuf, ctx->version, FKO_ENCODE_TMP_BUF_SIZE);
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/* Add the message type value.
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*/
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offset = strlen(tbuf);
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sprintf(((char*)tbuf+offset), ":%i:", ctx->message_type);
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/* Add the base64-encoded SPA message.
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*/
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if((res = append_b64(tbuf, ctx->message)) != FKO_SUCCESS)
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return(res);
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/** --DSS TODO: Need to address nat_access, server_auth
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*** XXX: and client_timeout message types here
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**/
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/* If encoded_msg is not null, then we assume it needs to
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* be freed before re-assignment.
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*/
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if(ctx->encoded_msg != NULL)
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free(ctx->encoded_msg);
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/* Copy our encoded data into the context.
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*/
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ctx->encoded_msg = strdup(tbuf);
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if(ctx->encoded_msg == NULL)
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return(FKO_ERROR_MEMORY_ALLOCATION);
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ctx->state |= FKO_SPA_ENCODE_MESSAGE_SET;
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/* At this point we can compute the digest for this SPA data.
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*/
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if((res = fko_set_spa_digest(ctx)) != FKO_SUCCESS)
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return(res);
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return(FKO_SUCCESS);
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}
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/* Return the SPA encryption type.
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*/
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int fko_decode_spa_data(fko_ctx_t *ctx)
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{
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/* Must be initialized
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*/
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if(!CTX_INITIALIZED(ctx))
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return(FKO_ERROR_CTX_NOT_INITIALIZED);
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return(FKO_SUCCESS);
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}
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/***EOF***/
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