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engine_interface.c
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engine_interface.c
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/***
Copyright 2010-2021 by Omar Alejandro Herrera Reyna
Caume Data Security Engine, also known as CaumeDSE is released under the
GNU General Public License by the Copyright holder, with the additional
exemption that compiling, linking, and/or using OpenSSL is allowed.
LICENSE
This file is part of Caume Data Security Engine, also called CaumeDSE.
CaumeDSE is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
CaumeDSE 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with CaumeDSE. If not, see <http://www.gnu.org/licenses/>.
INCLUDED SOFTWARE
This product includes software developed by the OpenSSL Project
for use in the OpenSSL Toolkit (http://www.openssl.org/).
This product includes cryptographic software written by
Eric Young ([email protected]).
This product includes software written by
Tim Hudson ([email protected]).
This product includes software from the SQLite library that is in
the public domain (http://www.sqlite.org/copyright.html).
This product includes software from the GNU Libmicrohttpd project, Copyright
© 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
2008, 2009, 2010 , 2011, 2012 Free Software Foundation, Inc.
This product includes software from Perl5, which is Copyright (C) 1993-2005,
by Larry Wall and others.
***/
#include "common.h"
int cmeSecureDBToMemDB (sqlite3 **resultDB, sqlite3 *pResourcesDB,const char *documentId,
const char *orgKey, const char *storagePath)
{ //IDD v.1.0.21
int cont,cont2,result,written,written2,MACLen;
int readBytes=0;
int partMACmismatch=0;
int numRows=0;
int numCols=0;
int numRowsMeta=0;
int numColsMeta=0;
int dbNumCols=0;
int dbNumReintegratedCols=0;
int dbNumRows=0;
char **queryResult=NULL;
char ***memDBResultData=NULL;
char ***memDBResultMeta=NULL;
char **resultMemTable=NULL;
char **colSQLDBfNames=NULL;
char **colSQLDBfSalts=NULL;
char **memFilePartsMACs=NULL;
char *currentDocumentId=NULL;
char *currentRawFileContent=NULL;
char *protectedValueMAC=NULL;
char *bkpFName=NULL;
char *sqlTableName="data"; //default table name for memory databases
unsigned char *decodedEncryptedString=NULL;
sqlite3 **memDBcol=NULL;
//MEMORY CLEANUP MACRO for local function.
#define cmeSecureDBToMemDBFree() \
do { \
cmeFree(currentDocumentId); \
cmeFree(currentRawFileContent); \
cmeFree(protectedValueMAC); \
cmeFree(resultMemTable); \
cmeFree (bkpFName); \
cmeFree (decodedEncryptedString); \
if (memDBcol) \
{ \
for(cont=0;cont<dbNumCols;cont++) \
{ \
if (memDBcol[cont]) \
{ \
cmeDBClose(memDBcol[cont]); \
memDBcol[cont]=NULL; \
} \
} \
cmeFree(memDBcol); \
} \
for (cont=0;cont<dbNumReintegratedCols;cont++) \
{ \
if (memDBResultData) \
{ \
if (memDBResultData[cont]) \
{ \
cmeMemTableFinal(memDBResultData[cont]); \
} \
} \
if (memDBResultMeta) \
{ \
if (memDBResultMeta[cont]) \
{ \
cmeMemTableFinal(memDBResultMeta[cont]); \
} \
} \
} \
for (cont=0;cont<dbNumCols;cont++) \
{ \
if (colSQLDBfNames) \
{ \
cmeFree(colSQLDBfNames[cont]); \
} \
if (memFilePartsMACs) \
{ \
cmeFree(memFilePartsMACs[cont]); \
} \
if (colSQLDBfSalts) \
{ \
cmeFree(colSQLDBfSalts[cont]); \
} \
} \
cmeFree(memDBResultData); \
cmeFree(memDBResultMeta); \
cmeFree(colSQLDBfNames); \
cmeFree(memFilePartsMACs); \
cmeFree(colSQLDBfSalts); \
if (queryResult) \
{ \
cmeMemTableFinal(queryResult); \
} \
} while (0); //Local free() macro.
/*NOTE: No need to free each element in resultMemTable, as they are just pointers to elements
from memDBResultData and memDBResultMeta.
//WIPING SENSITIVE DATA IN MEMORY AFTER USE in colSQLDBfNames!*/
*resultDB=NULL; //Pointer to results must not point to anything previously! (Caller responsibility).
//Open empty result DB (we must return at least an empty database in case of error). Caller must close it.
if (cmeDBCreateOpen(":memory:",resultDB))
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeSecureSQLToMemDB(), cmeDBCreateOpen() Error, can't "
"Create and Open memory DB to store unprotected DB created from colFiles!\n");
#endif
cmeSecureDBToMemDBFree(); //CLEANUP.
return(1);
}
result=cmeMemTable(pResourcesDB,"SELECT * FROM documents",&queryResult,&numRows,&numCols);
if(result) // Error
{
cmeSecureDBToMemDBFree(); //CLEANUP.
return(2);
}
//We reserve memory for the first file part (and will increment memory as needed):
colSQLDBfNames=(char **)malloc(sizeof(char *)); //We reserve memory for the estimated max. number of column parts to handle.
colSQLDBfSalts=(char **)malloc(sizeof(char *)); //We reserve memory for the estimated max. number of column parts to handle.
memFilePartsMACs=(char **)malloc(sizeof(char *)); //We reserve memory for the estimated max. number of column parts to handle.
memDBcol=(sqlite3 **)malloc(sizeof(sqlite3 *)); //We reserve memory for column sqlite3 structure.
//Initialize first file part pointers:
memDBcol[0]=NULL;
colSQLDBfNames[0]=NULL;
colSQLDBfSalts[0]=NULL;
memFilePartsMACs[0]=NULL;
//Get MAC length in chars:
cmeDigestLen(cmeDefaultMACAlg,&MACLen); //Get length of the MAC value (bytes).
MACLen*=2; //Convert byte length to HexStr length.
//Get list of column files from ResourcesDB:
for(cont=1;cont<=numRows;cont++) //First row in a cmeSQLTable contains the names of columns; we skip them.
{
//Unprotect documentId:
cmeFree(protectedValueMAC);
cmeHMACByteString((const unsigned char*)queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_documentId]+MACLen,
(unsigned char **)&protectedValueMAC,strlen(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_documentId]+MACLen),
&written,cmeDefaultMACAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),orgKey);
if (!strncmp(protectedValueMAC,queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_documentId],MACLen)) //MAC is correct; proceed with decryption.
{
result=cmeUnprotectDBSaltedValue(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_documentId]+MACLen,
¤tDocumentId,cmeDefaultEncAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),
orgKey,&written);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeSecureSQLToMemDB(), cmeUnprotectDBSaltedValue() error, cannot "
"decrypt documentId!\n");
#endif
cmeSecureDBToMemDBFree(); //CLEANUP.
return(3);
}
}
else //MAC is incorrect; skip decryption process.
{
#ifdef DEBUG
fprintf(stdout,"CaumeDSE Warning: cmeSecureSQLToMemDB(), cmeHMACByteString() cannot "
"verify documentId MAC!\n");
#endif
cmeStrConstrAppend(¤tDocumentId,""); //This pointer can't be null (strcmp() will segfault), so we point it to an empty string.
}
//Check if register is part of the requested file. If so continue processing it:
if (!strcmp(currentDocumentId,documentId)) //This column is part of the table!
{
//Unprotect columnFile:
cmeFree(protectedValueMAC);
cmeHMACByteString((const unsigned char*)queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_columnFile]+MACLen,
(unsigned char **)&protectedValueMAC,strlen(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_columnFile]+MACLen),
&written2,cmeDefaultMACAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),orgKey);
if (!strncmp(protectedValueMAC,queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_columnFile],MACLen)) //MAC is correct; proceed with decryption.
{
result=cmeUnprotectDBSaltedValue(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_columnFile]+MACLen,
&(colSQLDBfNames[dbNumCols]),cmeDefaultEncAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),
orgKey,&written2);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeSecureSQLToMemDB(), cmeUnprotectDBSaltedValue() error, cannot "
"decrypt columnFile!\n");
#endif
cmeSecureDBToMemDBFree(); //CLEANUP.
return(4);
}
}
else //MAC is incorrect; skip decryption process.
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeSecureSQLToMemDB(), cmeHMACByteString() error, cannot "
"verify columnFile MAC!\n");
#endif
cmeStrConstrAppend(&(colSQLDBfNames[dbNumCols]),""); //This pointer can't be null (strcmp() will segfault), so we point it to an empty string.
}
//Unprotect partMAC:
cmeFree(protectedValueMAC);
cmeHMACByteString((const unsigned char*)queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_partMAC]+MACLen,
(unsigned char **)&protectedValueMAC,strlen(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_partMAC]+MACLen),
&written2,cmeDefaultMACAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),orgKey);
if (!strncmp(protectedValueMAC,queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_partMAC],MACLen)) //MAC is correct; proceed with decryption.
{
result=cmeUnprotectDBSaltedValue(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_partMAC]+MACLen,
&(memFilePartsMACs[dbNumCols]),cmeDefaultEncAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),
orgKey,&written2);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeSecureSQLToMemDB(), cmeUnprotectDBSaltedValue() error, cannot "
"decrypt partMAC!\n");
#endif
cmeSecureDBToMemDBFree(); //CLEANUP.
return(5);
}
}
else //MAC is incorrect; skip decryption process.
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeSecureSQLToMemDB(), cmeHMACByteString() error, cannot "
"verify partMAC MAC!\n");
#endif
cmeStrConstrAppend(&(memFilePartsMACs[dbNumCols]),""); //This pointer can't be null (strcmp() will segfault), so we point it to an empty string.
}
//Copy salt:
cmeStrConstrAppend(&(colSQLDBfSalts[dbNumCols]),"%s",queryResult[(cont*numCols)+cmeIDDanydb_salt]);
//Increment number of columns found:
dbNumCols++;
//Grow reserved memory to hold next column element:
colSQLDBfNames=(char **)realloc(colSQLDBfNames,sizeof(char *)*(dbNumCols+1));
colSQLDBfSalts=(char **)realloc(colSQLDBfSalts,sizeof(char *)*(dbNumCols+1));
memFilePartsMACs=(char **)realloc(memFilePartsMACs,sizeof(char *)*(dbNumCols+1));
memDBcol=(sqlite3 **)malloc(sizeof(sqlite3 *)*(dbNumCols+1));
//Initialize recently allocated memory:
memDBcol[dbNumCols]=NULL;
colSQLDBfNames[dbNumCols]=NULL;
colSQLDBfSalts[dbNumCols]=NULL;
memFilePartsMACs[dbNumCols]=NULL;
}
//TODO (OHR#2#): EVERYWHERE - Research memset() replacement to ensure delete with volatile; assess mlock ().
if (currentDocumentId)
{
memset(currentDocumentId,0,strlen(currentDocumentId)); //WIPING SENSITIVE DATA IN MEMORY AFTER USE!
}
cmeFree(currentDocumentId);
}
for (cont=0;cont<dbNumCols;cont++) //Load protected columns
{
cmeStrConstrAppend(&bkpFName,"%s%s",storagePath,colSQLDBfNames[cont]);
//Verify MAC of raw column before unprotecting file:
cmeFree(protectedValueMAC);
cmeFree(currentRawFileContent);
result=cmeLoadStrFromFile(¤tRawFileContent,bkpFName,&readBytes);
if (result)
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeSecureSQLToMemDB(), cmeLoadStrFromFile() error cannot "
"load raw column file part: %s !\n",bkpFName);
#endif
cmeSecureDBToMemDBFree();
return(6);
}
result=cmeHMACByteString((const unsigned char *)currentRawFileContent,(unsigned char **)&protectedValueMAC,readBytes,&written,cmeDefaultMACAlg,&(colSQLDBfSalts[cont]),orgKey);
if (strcmp(protectedValueMAC,memFilePartsMACs[cont])) //Error!, MAC mismatch
{
partMACmismatch++; //Flag MAC mismatch for file part.
}
else //MAC OK; load column file.
{
if (cmeDBCreateOpen(":memory:",&(memDBcol[cont])))
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeSecureSQLToMemDB(), cmeDBCreateOpen() Error, can't "
"Create and Open memory DB to import secure colFiles; colFile No. %d!\n",cont);
#endif
cmeSecureDBToMemDBFree(); //CLEANUP.
return(7);
}
result=cmeMemDBLoadOrSave(memDBcol[cont],bkpFName,0);
if (result) //Error
{
cmeSecureDBToMemDBFree(); //CLEANUP.
return(8);
}
}
cmeFree(bkpFName);
}
if ((!dbNumCols)||partMACmismatch) //if file not found or file part MAC mismatch, exit.
{
cmeSecureDBToMemDBFree();
return(0);
}
//Reintegrate columns:
result=cmeMemSecureDBReintegrate(memDBcol,orgKey,dbNumCols,&dbNumReintegratedCols);
//Generate result table from reintegrated columns:
memDBResultMeta=(char ***)malloc(sizeof(char **)*dbNumReintegratedCols); //We reserve memory for column meta attributes.
memDBResultData=(char ***)malloc(sizeof(char **)*dbNumReintegratedCols); //We reserve memory for column data fields.
for (cont=0;cont<dbNumReintegratedCols;cont++)
{
memDBResultMeta[cont]=NULL;
memDBResultData[cont]=NULL;
result=cmeMemSecureDBUnprotect(memDBcol[cont],orgKey); //Unprotect secure column DB.
if (result) //Error
{
cmeSecureDBToMemDBFree(); //CLEANUP.
return(9);
}
result=cmeMemTable(memDBcol[cont],"SELECT * FROM meta",&(memDBResultMeta[cont]),
&numRowsMeta,&numColsMeta);
if(result) // Error
{
cmeSecureDBToMemDBFree(); //CLEANUP.
return(10);
}
result=cmeMemTable(memDBcol[cont],"SELECT * FROM data",&(memDBResultData[cont]),
&numRows,&numCols);
if(result) // Error
{
cmeSecureDBToMemDBFree(); //CLEANUP.
return(11);
}
cmeFree(bkpFName);
}
dbNumRows=numRows;
resultMemTable=(char **)malloc(sizeof(char *)*dbNumReintegratedCols*(dbNumRows+1)); //Consider 1 extra row for column names!
if (!resultMemTable) //Error
{
cmeSecureDBToMemDBFree(); //CLEANUP.
return(12);
}
for (cont=0;cont<=dbNumRows;cont++) //Import all data into a single, memory based, database.
{
for (cont2=0;cont2<dbNumReintegratedCols;cont2++) //Create Table with enough column elements; consider row for column names
{
if (cont) //Import data
{
resultMemTable[(cont*dbNumReintegratedCols)+cont2]=memDBResultData[cont2][((cont)*11)+4]; //Col. names are skipped w/ (cont+1)*11)+4....
}
else //Import column names
{
resultMemTable[(cont*dbNumReintegratedCols)+cont2]=memDBResultMeta[cont2][5+6];
}
}
}
result=cmeMemTableToMemDB (*resultDB, (const char **)resultMemTable, dbNumRows, dbNumReintegratedCols,
sqlTableName);
if (result) //Error
{
cmeSecureDBToMemDBFree(); //CLEANUP.
return(13);
}
//Free the rest of dynamically allocated resources that are no longer needed.
for (cont=0;cont<dbNumReintegratedCols;cont++) //Wipe sensitive data after use
{
if (colSQLDBfNames[cont])
{
memset(colSQLDBfNames[cont],0,strlen(colSQLDBfNames[cont]));
}
}
cmeSecureDBToMemDBFree();
return(0);
}
int cmeDeleteSecureDB (sqlite3 *pResourcesDB,const char *documentId, const char *orgKey, const char *storagePath)
{
int cont,result,written,written2,MACLen;
int numEntries=0;
int numRows=0;
int numCols=0;
int dbNumCols=0;
int *colsSQLDBIds=NULL;
char *currentDocumentId=NULL;
char *currentFName=NULL;
char *sqlQuery=NULL;
char *protectedValueMAC=NULL;
char **colSQLDBfNames=NULL;
char **queryResult=NULL;
#define cmeDeleteSecureDBFree() \
do { \
cmeFree(colsSQLDBIds); \
cmeFree(currentDocumentId); \
cmeFree(currentFName); \
cmeFree(sqlQuery); \
cmeFree(protectedValueMAC); \
for (cont=0;cont<dbNumCols;cont++) \
{ \
if (colSQLDBfNames) \
{ \
cmeFree(colSQLDBfNames[cont]); \
} \
} \
cmeFree(colSQLDBfNames); \
if (queryResult) \
{ \
cmeMemTableFinal(queryResult); \
} \
} while (0); //Local free() macro.
result=cmeExistsDocumentId(pResourcesDB,documentId,orgKey,&numEntries);
if (numEntries>0) //We have the same documentId already in the database...
{
cmeDigestLen(cmeDefaultMACAlg,&MACLen); //Get length of the MAC value (bytes).
MACLen*=2; //Convert byte length to HexStr length.
#ifdef DEBUG
fprintf(stdout,"CaumeDSE Debug: cmeDeleteSecureDB(), documentId %s already exists; "
"proceeding to delete it.\n",documentId);
#endif
result=cmeMemTable(pResourcesDB,"SELECT * FROM documents;",&queryResult,&numRows,&numCols);
if(result) // Error
{
cmeDeleteSecureDBFree();
return(1);
}
colSQLDBfNames=(char **)malloc(sizeof(char *)*cmeMaxCSVColumns);
for (cont=0;cont<cmeMaxCSVColumns;cont++)
{
colSQLDBfNames[cont]=NULL;
}
colsSQLDBIds=(int *)malloc(sizeof(int)*numRows);
for(cont=1;cont<=numRows;cont++) //First row in a cmeSQLTable contains the names of columns; we skip them.
{
//Unprotect documentId:
cmeFree(protectedValueMAC);
cmeHMACByteString((const unsigned char*)queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_documentId]+MACLen,
(unsigned char **)&protectedValueMAC,strlen(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_documentId]+MACLen),
&written,cmeDefaultMACAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),orgKey);
if (!strncmp(protectedValueMAC,queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_documentId],MACLen)) //MAC is correct; proceed with decryption.
{
result=cmeUnprotectDBSaltedValue(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_documentId]+MACLen,
¤tDocumentId,cmeDefaultEncAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),
orgKey,&written);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeDeleteSecureDB(), cmeUnprotectDBSaltedValue() error, cannot "
"decrypt documentId!\n");
#endif
cmeDeleteSecureDBFree(); //CLEANUP.
return(2);
}
if (!strcmp(currentDocumentId,documentId))//This column is part of the table!
{
//Unprotect columnFile:
cmeFree(protectedValueMAC);
cmeHMACByteString((const unsigned char*)queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_columnFile]+MACLen,
(unsigned char **)&protectedValueMAC,strlen(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_columnFile]+MACLen),
&written2,cmeDefaultMACAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),orgKey);
if (!strncmp(protectedValueMAC,queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_columnFile],MACLen)) //MAC is correct; proceed with decryption.
{
result=cmeUnprotectDBSaltedValue(queryResult[(cont*numCols)+cmeIDDResourcesDBDocuments_columnFile]+MACLen,
&(colSQLDBfNames[dbNumCols]),cmeDefaultEncAlg,&(queryResult[(cont*numCols)+cmeIDDanydb_salt]),
orgKey,&written2);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeDeleteSecureDB(), cmeUnprotectDBSaltedValue() error, cannot "
"decrypt documentId!\n");
#endif
cmeDeleteSecureDBFree(); //CLEANUP.
return(3);
}
}
else //MAC is incorrect; skip decryption process.
{
#ifdef DEBUG
fprintf(stdout,"CaumeDSE Warning: cmeDeleteSecureDB(), cmeHMACByteString() cannot "
"verify columnFile MAC!\n");
#endif
cmeStrConstrAppend(&(colSQLDBfNames[dbNumCols]),""); //This pointer can't be null (strcmp() will segfault), so we point it to an empty string.
}
colsSQLDBIds[dbNumCols]=atoi(queryResult[cont*numCols]+cmeIDDanydb_id); //Store register ID; register will be deleted from resourcesDB index. Santized with atoi().
dbNumCols++;
}
memset(currentDocumentId,0,written); //WIPING SENSITIVE DATA IN MEMORY AFTER USE!
cmeFree(currentDocumentId);
}
else //MAC is incorrect; skip decryption process.
{
#ifdef DEBUG
fprintf(stdout,"CaumeDSE Warning: cmeDeleteSecureDB(), cmeHMACByteString() cannot "
"verify documentId MAC!\n");
#endif
cmeStrConstrAppend(¤tDocumentId,""); //This pointer can't be null (strcmp() will segfault), so we point it to an empty string.
}
}
for(cont=0; cont <dbNumCols; cont++)
{
//Delete from ResourcesDB.
cmeStrConstrAppend(&sqlQuery,"BEGIN;"
"DELETE FROM documents WHERE id=%d;"
"COMMIT;",colsSQLDBIds[cont]);
result=cmeSQLRows(pResourcesDB,sqlQuery,NULL,NULL);
cmeFree(sqlQuery);
if (result)
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeDeleteSecureDB(), cmeSQLRows() Error, can't "
"delete secureDB column, query: %s!\n",sqlQuery);
#endif
cmeDeleteSecureDBFree();
return(4);
}
//Delete Column Files:
cmeStrConstrAppend(¤tFName,"%s%s",cmeDefaultFilePath,colSQLDBfNames[cont]); // NOTE (OHR#2#): Use provided storagePath (or better yet, get it from the document defined storage) instead of using cmeDefaultFilePath
result=remove(currentFName);
cmeFree(currentFName);
if (result)
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeDeleteSecureDB(), remove() Error, can't "
"delete secureDB column file: %s\n",currentFName);
#endif
cmeDeleteSecureDBFree();
return(5);
}
}
//Prepare to free the rest of dynamically allocated resources that are no longer needed.
for (cont=0;cont<dbNumCols;cont++)
{
memset(colSQLDBfNames[cont],0,written2); //WIPING SENSITIVE DATA IN MEMORY AFTER USE!
colsSQLDBIds[cont]=0; //WIPING SENSITIVE DATA IN MEMORY AFTER USE!
}
}
else //WARNING: document ID not found
{
#ifdef DEBUG
fprintf(stdout,"CaumeDSE Debug: cmeDeleteSecureDB(), documentId %s not found! "
"No document ID was deleted.\n",documentId);
#endif
}
cmeDeleteSecureDBFree();
return(0);
}
int cmeGetUnprotectDBRegisters (sqlite3 *pDB, const char *tableName, const char **columnNames,
const char **columnValues,const int numColumnValues, char ***resultRegisterCols,
int *numResultRegisterCols, int *numResultRegisters, const char *orgKey)
{
int result,cont,cont2,cont3,MACLen;
int valueLen=0;
int numMatch=0;
int numRows=0;
int numColumns=0;
char *query=NULL;
char *protectedValueMAC=NULL;
char **resultsRegTmp=NULL;
char **sqlTable=NULL;
#define cmeGetUnprotectDBRegisterFree() \
do { \
cmeFree(query); \
cmeFree(protectedValueMAC); \
if (sqlTable) \
{ \
cmeMemTableFinal(sqlTable); \
} \
} while (0); //Local free() macro.
*numResultRegisters=1; //We will reserve memory for at least one result register.
//1st Load all encrypted registers in a memTable.
//TODO (OHR#3#): Check alternative for enabling tables with no results to return column names as 1st row;
// 'PRAGMA empty_result_callbacks = ON' is deprecated according to SQLITE 3 docs!
cmeStrConstrAppend(&query,"PRAGMA empty_result_callbacks = ON; SELECT * FROM %s;",
tableName);
result=cmeMemTable(pDB,(const char *)query,&sqlTable,&numRows,&numColumns);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeGetUnprotectDBRegister(), cmeMemTable() Error, can't "
"execute query %s in table:%s!\n",query,tableName);
#endif
cmeGetUnprotectDBRegisterFree();
return(1);
}
*numResultRegisterCols=numColumns;
*resultRegisterCols=(char **)malloc(sizeof(char *)*numColumns*2); //Allocate space for colum names and first row of result values.
cmeDigestLen(cmeDefaultMACAlg,&MACLen); //Get length of the MAC value (bytes).
MACLen*=2; //Convert byte length to HexStr length.
for (cont=0;cont<numColumns;cont++) //First copy all column names in the first row and set to NULL the second row for result values.
{
(*resultRegisterCols)[cont]=NULL; //cmeStrContrAppend requires this for new strings.
cmeStrConstrAppend(&((*resultRegisterCols)[cont]),"%s",sqlTable[cont]); //Add header names (row 0).
(*resultRegisterCols)[(*numResultRegisters)*numColumns+cont]=NULL;
}
for (cont=1;cont<=numRows;cont++) //Process each row (ignore row 0 with column header names)
{
numMatch=0;
for (cont2=0;cont2<numColumns;cont2++) //Process each column - first search for filter matches.
{
cmeFree((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]); //Clear memory space before use.
if ((strcmp(sqlTable[cont2],"id")!=0)&&(strcmp(sqlTable[cont2],"salt")!=0)
&&(sqlTable[cont*numColumns+cont2]!=NULL)) //We decrypt and compare, except if column name is 'id' or 'salt'.
{
if (strlen(sqlTable[cont*numColumns+cont2])>(size_t)MACLen) //Good, protected value is longer than MAC value.
{
cmeHMACByteString((const unsigned char *)sqlTable[cont*numColumns+cont2]+MACLen,(unsigned char **)&protectedValueMAC,strlen(sqlTable[cont*numColumns+cont2]+MACLen),
&valueLen,cmeDefaultMACAlg,&(sqlTable[cont*numColumns+cmeIDDanydb_salt]),orgKey);
if (!strncmp(protectedValueMAC,sqlTable[cont*numColumns+cont2],MACLen)) //MAC is correct; proceed with decryption.
{
//If cmeUnprotectDBSaltedValue() !=0, value can't be decrypted with the key provided (2) or is NULL (1)! No need to compare incorrectly decrypted values!
if(!cmeUnprotectDBSaltedValue(sqlTable[cont*numColumns+cont2]+MACLen,&((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]),
cmeDefaultEncAlg,&(sqlTable[cont*numColumns+cmeIDDanydb_salt]),orgKey,&valueLen))
{
for (cont3=0;cont3<numColumnValues;cont3++) //Check each relevant column by name.
{
if ((strcmp(sqlTable[cont2],columnNames[cont3])==0) && //Matches column name.
(strcmp((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2],columnValues[cont3])==0)) //And matches value filter.
{
numMatch++;
}
}
}
}
cmeFree(protectedValueMAC);
}
else //Error: protectedValue length shouldn't be <= MACLen
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeGetUnprotectDBRegister(), Error, length "
"of protected value (%u) <= length of MAC (%d) for default HMAC alg. %s!\n",
(unsigned int)strlen(sqlTable[cont*numColumns+cont2]),MACLen,cmeDefaultMACAlg);
#endif
}
}
else //We just compare ('salt' and 'id' column names).
{
cmeStrConstrAppend(&((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]),
"%s",sqlTable[cont*numColumns+cont2]);
for (cont3=0;cont3<numColumnValues;cont3++) //Check each relevant column by name.
{
if ((strcmp(sqlTable[cont2],columnNames[cont3])==0) && //Matches column name.
(strcmp(sqlTable[cont*numColumns+cont2],columnValues[cont3])==0)) //And matches value filter.
{
numMatch++;
}
}
}
}
if ((numMatch==numColumnValues)||(numColumnValues==0)) //We found all matches in a register; add the results to the result array.
{
(*numResultRegisters)++;
resultsRegTmp=(char **)realloc(*resultRegisterCols,sizeof(char *)*numColumns*((*numResultRegisters)+1)); //realocate space to allow one more register
if (resultsRegTmp)
{
*resultRegisterCols=resultsRegTmp;
}
else // Realloc error!!!
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeGetUnprotectDBRegister(), realloc() Error, can't "
"allocate new memory block of size: %lu\n",sizeof(char *)*numColumns*((*numResultRegisters)+1));
#endif
cmeGetUnprotectDBRegisterFree();
return(2);
}
for (cont2=0;cont2<numColumns;cont2++) //Clear new value pointers.
{
(*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]=NULL; //cmeStrContrAppend requires this for new strings.
}
}
}
cmeGetUnprotectDBRegisterFree();
(*numResultRegisters)--; //Adjust number of results by eliminating the last row which is a placeholder for the next "potential" match.
return(0);
}
int cmeDeleteUnprotectDBRegisters (sqlite3 *pDB, const char *tableName, const char **columnNames,
const char **columnValues,const int numColumnValues, char ***resultRegisterCols,
int *numResultRegisterCols, int *numResultRegisters, const char *orgKey)
{
int result,cont,cont2,cont3,MACLen;
int valueLen=0;
int numMatch=0;
int numRows=0;
int numColumns=0;
char *protectedValueMAC=NULL;
char *regId=NULL;
char *query=NULL;
char **sqlTable=NULL;
#define cmeDeleteUnprotectDBRegisterFree() \
do { \
cmeFree(query); \
cmeFree(regId); \
cmeFree(protectedValueMAC); \
if (sqlTable) \
{ \
cmeMemTableFinal(sqlTable); \
} \
} while (0); //Local free() macro.
*numResultRegisters=1; //We will reserve memory for at least one result register.
//1st Load all encrypted registers in a memTable.
//TODO (OHR#3#): Check alternative for enabling tables with no results to return column names as 1st row;
// 'PRAGMA empty_result_callbacks = ON' is deprecated according to SQLITE 3 docs!
cmeStrConstrAppend(&query,"PRAGMA empty_result_callbacks = ON; SELECT * FROM %s;",
tableName);
result=cmeMemTable(pDB,(const char *)query,&sqlTable,&numRows,&numColumns);
cmeFree(query);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeDeleteUnprotectDBRegister(), cmeMemTable() Error, can't "
"execute query %s in table:%s!\n",query,tableName);
#endif
cmeDeleteUnprotectDBRegisterFree();
return(1);
}
*numResultRegisterCols=numColumns;
*resultRegisterCols=(char **)malloc(sizeof(char *)*numColumns*2); //Allocate space for colum names and first row of result values.
cmeDigestLen(cmeDefaultMACAlg,&MACLen); //Get length of the MAC value (bytes).
MACLen*=2; //Convert byte length to HexStr length.
for (cont=0;cont<numColumns;cont++) //First copy all column names in the first row.
{
(*resultRegisterCols)[cont]=NULL; //cmeStrContrAppend requires this for new strings.
cmeStrConstrAppend(&((*resultRegisterCols)[cont]),"%s",sqlTable[cont]); //Add header names (row 0).
(*resultRegisterCols)[(*numResultRegisters)*numColumns+cont]=NULL;
}
for (cont=1;cont<=numRows;cont++) //Process each row (ignore row 0 with column header names)
{
numMatch=0; //Reset match counter.
cmeFree(regId);
for (cont2=0;cont2<numColumns;cont2++) //Process each column - first search for filter matches.
{
cmeFree((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]); //Clear memory space before use.
if ((strcmp(sqlTable[cont2],"id")!=0)&&(strcmp(sqlTable[cont2],"salt")!=0)
&&(sqlTable[cont*numColumns+cont2]!=NULL)) //We decrypt and compare, except if column name is 'id' or 'salt'.
{
if (strlen(sqlTable[cont*numColumns+cont2])>(size_t)MACLen) //Good, protected value is longer than MAC value.
{
cmeHMACByteString((const unsigned char *)sqlTable[cont*numColumns+cont2]+MACLen,(unsigned char **)&protectedValueMAC,strlen(sqlTable[cont*numColumns+cont2]+MACLen),
&valueLen,cmeDefaultMACAlg,&(sqlTable[cont*numColumns+cmeIDDanydb_salt]),orgKey);
if (!strncmp(protectedValueMAC,sqlTable[cont*numColumns+cont2],MACLen)) //MAC is correct; proceed with decryption.
{
//If cmeUnprotectDBSaltedValue() !=0, value can't be decrypted with the key provided (2) or is NULL (1)! No need to compare incorrectly decrypted values!
if(!cmeUnprotectDBSaltedValue(sqlTable[cont*numColumns+cont2]+MACLen,&((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]),
cmeDefaultEncAlg,&(sqlTable[cont*numColumns+cmeIDDanydb_salt]),orgKey,&valueLen))
{
for (cont3=0;cont3<numColumnValues;cont3++) //Check each relevant column by name.
{
if ((strcmp(sqlTable[cont2],columnNames[cont3])==0) && //Matches column name.
(strcmp((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2],columnValues[cont3])==0)) //And matches value filter.
{
numMatch++;
}
}
}
}
cmeFree(protectedValueMAC);
}
else //Error: protectedValue length shouldn't be <= MACLen
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeGetUnprotectDBRegister(), Error, length "
"of protected value (%u) <= length of MAC (%d) for default HMAC alg. %s!\n",
(unsigned int)strlen(sqlTable[cont*numColumns+cont2]),MACLen,cmeDefaultMACAlg);
#endif
}
}
else //We just compare ('salt' and 'id' column names).
{
cmeStrConstrAppend(&((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]),
"%s",sqlTable[cont*numColumns+cont2]);
for (cont3=0;cont3<numColumnValues;cont3++) //Check each relevant column by name.
{
if ((strcmp(sqlTable[cont2],columnNames[cont3])==0) && //Matches column name.
(strcmp(sqlTable[cont*numColumns+cont2],columnValues[cont3])==0)) //And matches value filter.
{
numMatch++;
}
}
if (cont2==cmeIDDanydb_id)
{
cmeStrConstrAppend(®Id,"%s",sqlTable[cont*numColumns+cont2]);
}
}
}
if ((numMatch==numColumnValues)||(numColumnValues==0)) //We found all matches in a register; process this row.
{
(*numResultRegisters)++;
cmeStrConstrAppend(&query,"BEGIN TRANSACTION; DELETE FROM \"%s\" WHERE id=%d; COMMIT;",tableName,atoi(regId)); //regId sanitized with atoi().
result=cmeSQLRows(pDB,(const char *)query,NULL,NULL);
cmeFree(query);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmeDeleteUnprotectDBRegister(), sql Error, can't "
"DELETE, statement: %s\n",query);
#endif
cmeDeleteUnprotectDBRegisterFree();
///return(2);
}
*resultRegisterCols=(char **)realloc(*resultRegisterCols,sizeof(char *)*numColumns*((*numResultRegisters)+1)); //Reallocate space for colum names and first row of result values.
for (cont3=0;cont3<numColumns;cont3++) //All column values in the new row.
{
(*resultRegisterCols)[(*numResultRegisters)*numColumns+cont3]=NULL;
}
}
}
cmeDeleteUnprotectDBRegisterFree();
(*numResultRegisters)--; //Adjust number of results by eliminating the last row which is a placeholder for the next "potential" match.
return(0);
}
int cmePostProtectDBRegister (sqlite3 *pDB, const char *tableName, const char **columnNames,
const char **columnValues,const int numColumnValues, const char *orgKey)
{ //NOTE: Authorization and parameter validation takes place outside (at web interface level!).
int cont,result,protectedValueLen,protectedValueMACLen;
char *sqlStatement=NULL;
char *protectedValue=NULL;
char *protectedValueMAC=NULL;
char *salt=NULL;
char *sanitizedStr=NULL;
#define cmePostProtectDBRegisterFree() \
do { \
cmeFree(sqlStatement); \
cmeFree(protectedValue); \
cmeFree(protectedValueMAC); \
cmeFree(salt); \
cmeFree(sanitizedStr); \
} while (0); //Local free() macro.
cmeStrConstrAppend (&sqlStatement,"BEGIN TRANSACTION; INSERT INTO \"%s\" (id,",tableName); //First part. id goes by default.
for (cont=0; cont<numColumnValues; cont++)
{
if (!columnNames[cont]) //Error, colName is NULL!
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmePostProtectDBRegister(), Error,"
"NULL pointer at columnNames[%d]\n",cont);
#endif
cmePostProtectDBRegisterFree();
return(1);
}
if (!strcmp(columnNames[cont],"salt")) //Salt provided? yes -> use it and append at the end.
{
if (columnValues[cont]) //user provided value; else use NULL
{
cmeFree(sanitizedStr);
cmeSanitizeStrForSQL(columnValues[cont],&sanitizedStr); //Sanitize parameter salt for use in SQL statement.
//TODO (OHR#3#): verify salt requirements. If bad, ERROR!
cmeStrConstrAppend(&salt,"%s",sanitizedStr);
}
}
else
{
cmeStrConstrAppend(&sqlStatement,"%s",columnNames[cont]); //add column.
if ((cont+1)<numColumnValues) //Still one left...
{
cmeStrConstrAppend(&sqlStatement,","); //add comma.
}
}
}
cmeStrConstrAppend (&sqlStatement,",salt) VALUES (NULL,"); //Second part. id=NULL goes by default.
for (cont=0; cont<numColumnValues; cont++)
{
if ((strcmp(columnNames[cont],"salt")!=0)&&(columnValues[cont]!=NULL)) //Skip salt, we will add it at the end.
{
cmeProtectDBSaltedValue(columnValues[cont],&protectedValue,cmeDefaultEncAlg,&salt,orgKey,&protectedValueLen);
cmeHMACByteString((const unsigned char *)protectedValue,(unsigned char **)&protectedValueMAC,protectedValueLen,&protectedValueMACLen,cmeDefaultMACAlg,&salt,orgKey);
cmeStrConstrAppend(&sqlStatement,"'%s%s'",protectedValueMAC,protectedValue); //add MAC+Encrypted(salted) column value to query.
cmeFree(protectedValue);
cmeFree(protectedValueMAC);
if ((cont+1)<numColumnValues) //Still one left...
{
cmeStrConstrAppend(&sqlStatement,","); //add comma.
}
}
}
cmeStrConstrAppend (&sqlStatement,",'%s'); COMMIT;",salt); //Last part.
result=cmeSQLRows(pDB,sqlStatement,NULL,NULL);
if (result) //Error.
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmePostProtectDBRegister(), cmeSQLRows() Error, can't "
"create register in table: %s with sql statement %s!\n",tableName,sqlStatement);
#endif
cmePostProtectDBRegisterFree();
return(2);
}
cmePostProtectDBRegisterFree();
return(0);
}
int cmePutProtectDBRegisters (sqlite3 *pDB, const char *tableName, const char **columnNames,
const char **columnValues,const int numColumnValues, const char **columnNamesUpdate,
const char **columnValuesUpdate,const int numColumnValuesUpdate, char ***resultRegisterCols,
int *numResultRegisterCols, int *numResultRegisters, const char *orgKey)
{
int result,cont,cont2,cont3,MACLen,protectedValueMACLen;
int valueLen=0;
int numMatch=0;
int numRows=0;
int numColumns=0;
int encryptedValueLen=0;
char *regId=NULL;
char *query=NULL;
char *sanitizedStr=NULL;
char *protectedValueMAC=NULL;
char *encryptedValue=NULL;
char **resultsRegTmp=NULL;
char **sqlTable=NULL;
#define cmePutProtectDBRegisterFree() \
do { \
cmeFree(query); \
cmeFree(regId); \
cmeFree(protectedValueMAC); \
cmeFree(encryptedValue); \
cmeFree(sanitizedStr); \
if (sqlTable) \
{ \
cmeMemTableFinal(sqlTable); \
} \
} while (0); //Local free() macro.
*numResultRegisters=1; //We will reserve memory for at least one result register.
//1st Load all encrypted registers in a memTable.
//TODO (OHR#3#): Check alternative for enabling tables with no results to return column names as 1st row;
// 'PRAGMA empty_result_callbacks = ON' is deprecated according to SQLITE 3 docs!
cmeStrConstrAppend(&query,"PRAGMA empty_result_callbacks = ON; SELECT * FROM %s;",
tableName);
result=cmeMemTable(pDB,(const char *)query,&sqlTable,&numRows,&numColumns);
cmeFree(query);
if (result) //Error
{
#ifdef ERROR_LOG
fprintf(stderr,"CaumeDSE Error: cmePutProtectDBRegister(), cmeMemTable() Error, can't "
"execute query %s in table:%s!\n",query,tableName);
#endif
cmePutProtectDBRegisterFree();
return(1);
}
*numResultRegisterCols=numColumns;
*resultRegisterCols=(char **)malloc(sizeof(char *)*numColumns*2); //Allocate space for colum names and first row of result values.
cmeDigestLen(cmeDefaultMACAlg,&MACLen); //Get length of the MAC value.
MACLen*=2; //Convert byte length to HexStr length.
for (cont=0;cont<numColumns;cont++) //First copy all column names in the first row.
{
(*resultRegisterCols)[cont]=NULL; //cmeStrContrAppend requires this for new strings.
cmeStrConstrAppend(&((*resultRegisterCols)[cont]),"%s",sqlTable[cont]); //Add header names (row 0).
(*resultRegisterCols)[(*numResultRegisters)*numColumns+cont]=NULL;
}
for (cont=1;cont<=numRows;cont++) //Process each row (ignore row 0 with column header names)
{
numMatch=0;
cmeFree(regId);
for (cont2=0;cont2<numColumns;cont2++) //Process each column - first search for filter matches.
{
cmeFree((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]); //Clear memory space before use.
if ((strcmp(sqlTable[cont2],"id")!=0)&&(strcmp(sqlTable[cont2],"salt")!=0)
&&(sqlTable[cont*numColumns+cont2]!=NULL)) //We decrypt and compare, except if column name is 'id' or 'salt'.
{
if (strlen(sqlTable[cont*numColumns+cont2])>(size_t)MACLen) //Good, protected value is longer than MAC value.
{
cmeHMACByteString((const unsigned char *)sqlTable[cont*numColumns+cont2]+MACLen,(unsigned char **)&protectedValueMAC,strlen(sqlTable[cont*numColumns+cont2]+MACLen),
&valueLen,cmeDefaultMACAlg,&(sqlTable[cont*numColumns+cmeIDDanydb_salt]),orgKey);
if (!strncmp(protectedValueMAC,sqlTable[cont*numColumns+cont2],MACLen)) //MAC is correct; proceed with decryption.
{
//If cmeUnprotectDBSaltedValue() !=0, value can't be decrypted with the key provided (2) or is NULL (1)! No need to compare incorrectly decrypted values!
if(!cmeUnprotectDBSaltedValue(sqlTable[cont*numColumns+cont2]+MACLen,&((*resultRegisterCols)[(*numResultRegisters)*numColumns+cont2]),
cmeDefaultEncAlg,&(sqlTable[cont*numColumns+cmeIDDanydb_salt]),orgKey,&valueLen))
{
for (cont3=0;cont3<numColumnValues;cont3++) //Check each relevant column by name.
{
if ((strcmp(sqlTable[cont2],columnNames[cont3])==0) && //Matches column name.