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/*
*
* Copyright (C) 2013, Hewlett-Packard Development Company, LLP
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* Neither the name of the Hewlett-Packard Corporation, nor the names
* of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Author(s)
* Mohan Devarajulu <mohan@fc.hp.com>
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <glib.h>
#include <SaHpi.h>
#include <oh_utils.h>
#include <oh_error.h>
#ifdef HAVE_ENCRYPT
SaErrorT oh_initialize_gcrypt(gcry_cipher_hd_t *h1, gcry_cipher_hd_t *h2, gchar *key)
{
static int initialized = 0;
if (initialized == 1)
return(0);
if ((!gcry_check_version ( NULL )) ||
(gcry_control( GCRYCTL_DISABLE_SECMEM_WARN )) ||
(gcry_control( GCRYCTL_INIT_SECMEM, 16384, 0 )) ||
(gcry_cipher_open( h1, GCRY_CIPHER_ARCFOUR,GCRY_CIPHER_MODE_STREAM,0 )) ||
(gcry_cipher_open( h2, GCRY_CIPHER_ARCFOUR,GCRY_CIPHER_MODE_STREAM,0 )) ||
(gcry_cipher_setkey ( *h1, key, strlen(key) )) ||
(gcry_cipher_setkey ( *h2, key, strlen(key) ))) {
CRIT("Something went wrong with gcrypt calls");
return(1);
} else {
initialized = 1;
return(0);
}
}
/******************************************************************************
* gchar *oh_crypt(gchar *file_path, SaHpiUint32T type)
*
* Function to encrypt or decrypt given file. The encrypted
* or decrypted text is returned to the caller. The caller needs to free the
* memory.
* While encrypting the file, encrypted file is saved to the original file
* location after a check and the encrypted text is sent to the caller. While
* decrypting, the decrypted text is sent to the caller, but the original file
* is left intact.
*
* file_path - File name to be encrypted or decrypted. When the file is
* encrypted, the original file is overwritten, when it is decrypted it is left
* as it is
* type - Encrypt or Decrypt.
*
* Return: gchar *
* Encrypted or Decrypted string
*
*****************************************************************************/
gchar * oh_crypt(gchar *file_path, SaHpiUint32T type)
{
gcry_cipher_hd_t handle1, handle2;
int ret = 0, err=0, cwd_fd = 0;
struct stat buf, keybuf;
char * plain_text = NULL;
char * ptr_substr = NULL;
char * out = NULL;
char * key = NULL;
char * deout = NULL;
long int file_size = 0, en_file_size=0;
char file_path_ck[PATH_MAX];
char file_path_en[PATH_MAX];
char cwd[PATH_MAX];
FILE *fconf = NULL, *fpuuid = NULL;
/* If you can not stat then you can not access the file */
if (getcwd(cwd, sizeof(cwd)) != NULL)
cwd_fd = open(cwd, O_DIRECTORY, S_IWUSR);
ret = faccessat(cwd_fd, file_path, R_OK, AT_EACCESS );
if (ret != 0 )
{
CRIT("Can not access file %s",file_path);
return(NULL);
} else {
ret = stat(file_path, &buf);
/* Really stat call should not fail here */
if (ret != 0 )
{
CRIT("Can not stat file %s",file_path);
return(NULL);
}
}
file_size = buf.st_size;
if ((file_size > 1000000000) ||
(strlen(file_path)+10 > PATH_MAX)) {
CRIT("%s path is long or too big",file_path);
return(NULL);
}
plain_text = ( char * ) g_malloc0
( sizeof ( char ) * ( file_size + 1) );
fconf = fopen(file_path,"r");
if (fconf == NULL) {
CRIT("Unable to open %s",file_path);
return(NULL);
}
fread(plain_text, 1, file_size, fconf);
fclose(fconf);
ret = faccessat(0, PUUID_PATH, R_OK, AT_EACCESS );
if ( ret != 0 ) {
if (geteuid() == 0) {
WARN("Could not find %s",PUUID_PATH);
WARN("Using the SAHPI_DEFKEY. If the above file is created");
WARN("ever, move the file away to decrypt");
}
key = ( char * ) g_malloc0 ( sizeof ( char ) * ( strlen(SAHPI_DEFKEY)+1) );
strcpy(key,SAHPI_DEFKEY);
} else {
ret = stat(PUUID_PATH, &keybuf);
/* Really stat call should not fail here */
if (ret != 0 )
{
CRIT("Can not stat file %s",PUUID_PATH);
return(NULL);
}
fpuuid=fopen(PUUID_PATH, "r");
if (fpuuid == NULL) {
if (geteuid() == 0)
CRIT("Unable to open %s",PUUID_PATH);
else
CRIT("Unable to open %s, Use sudo", PUUID_PATH);
return(NULL);
}
key = ( char * ) g_malloc0 ( sizeof ( char ) * ( keybuf.st_size + 1) );
ret=fread(key, 1, keybuf.st_size, fpuuid);
fclose(fpuuid);
}
if(oh_initialize_gcrypt(&handle1, &handle2, key)) {
CRIT("Could not initialize gcrypt libraries");
g_free(key);
return(NULL);
}
if ( type == OHPI_ENCRYPT ) {
ptr_substr=strstr(plain_text,"handler");
if (!ptr_substr) {
CRIT("Looks like the %s does not have a handler",file_path);
CRIT("It is either already encrypted or no plugins defined");
g_free(plain_text);
g_free(key);
return(NULL);
}
out = ( char * ) g_malloc0 ( sizeof ( char ) * ( file_size + 1 ) );
err = gcry_cipher_encrypt ( handle1, ( unsigned char * ) out, file_size,
( const unsigned char * ) plain_text, file_size );
if ( err )
{
CRIT("Failure: %s/%s", gcry_strsource ( err ), gcry_strerror ( err ) );
g_free(plain_text);
g_free(out);
g_free(key);
return(NULL);
}
strcpy(file_path_en, file_path);
strcat(file_path_en,".temp_en");
if (access (file_path_en, F_OK) != -1 ) {
CRIT("Trying to use %s for temporary_file",file_path_en);
CRIT("That file already exists. Remove it and restart again");
g_free(plain_text);
g_free(out);
g_free(key);
return(NULL);
}
fconf = fopen(file_path_en,"w");
if (fconf == NULL) {
CRIT("Unable to open the file for writing");
g_free(plain_text);
g_free(out);
g_free(key);
return(NULL);
}
err = fwrite(out, 1, file_size, fconf);
if (err != file_size ) {
CRIT("Wrote %d, but expected to write %ld",err, file_size);
g_free(plain_text);
g_free(out);
g_free(key);
return(NULL);
}
err = 0;
fclose(fconf);
ret = chmod(file_path_en, buf.st_mode); /* Setting mode to original file mode */
ret = stat(file_path_en, &buf);
en_file_size = buf.st_size;
if (file_size != en_file_size) {
CRIT("original file size %ld, encrypted %ld", file_size, en_file_size);
g_free(plain_text);
g_free(out);
g_free(key);
return(NULL);
}
memset(out,0,file_size);
fconf = fopen(file_path_en,"r");
fread(out,1,file_size,fconf);
fclose(fconf);
deout = ( char * ) g_malloc0 ( sizeof ( char ) * ( file_size + 1 ) );
err = gcry_cipher_decrypt ( handle2, ( unsigned char * ) deout, file_size,
( const unsigned char * ) out, file_size );
if (strcmp(deout, plain_text) != 0 || (err)) {
CRIT("Unable to encrypt and decrypt");
if(err)
CRIT("decrypt call failed");
remove(file_path_en);
if (strlen(file_path)+10 < 1024) {
strcpy(file_path_ck, file_path);
strcat(file_path_ck,".check");
}
fconf = fopen(file_path_ck,"w");
err = fwrite(deout, 1, file_size, fconf);
if (err != file_size ) {
CRIT("Wrote %d, but expected to write %ld",err, file_size);
}
CRIT("compare %s and %s. Encryption failed",file_path,file_path_ck);
g_free(plain_text);
g_free(out);
g_free(deout);
g_free(key);
return(NULL);
}
/* At this point everything is ok. Able to encrypt and save into a file.
* the same file is read and the contents decrypted. Original and decryption
* match. So move the encrypted file to the original location */
g_free(plain_text);
g_free(deout);
err = 0;
err = rename(file_path_en, file_path);
if ( err != 0 ) {
CRIT("%s is not moved to %s",file_path_en,file_path);
g_free(out);
g_free(key);
return(NULL);
}
g_free(key);
return(out);
} else if(type == OHPI_DECRYPT) {
ptr_substr=strstr(plain_text,"handler");
if (ptr_substr) {
CRIT("Looks like the %s is a plain file",file_path);
CRIT("It was not encrypted?. Please check");
g_free(plain_text);
g_free(key);
return(NULL);
}
out = ( char * ) g_malloc0 ( sizeof ( char ) * ( file_size + 1 ) );
err = gcry_cipher_decrypt ( handle2, ( unsigned char * ) out, file_size,
( const unsigned char * ) plain_text, file_size );
if ( err )
{
CRIT("Failure: %s/%s", gcry_strsource ( err ), gcry_strerror ( err ) );
g_free(plain_text);
g_free(out);
g_free(key);
return(NULL);
} else {
g_free(plain_text);
ptr_substr = NULL;
ptr_substr=strstr(out,"handler");
if ((!ptr_substr) && (geteuid() == 0)) {
CRIT("Looks like the decrypted texts does not have a handler");
CRIT("Decryption might have failed.");
if(!strcmp(key,SAHPI_DEFKEY))
INFO("Check if %s exists",PUUID_PATH);
else {
INFO("Try to decrypt it as a normal user/no sudo");
INFO("if that fails recover from backup. Sorry");
}
} else if (!ptr_substr) {
CRIT("Looks like the decrypted text does not have a handler");
CRIT("Decryption might have failed.");
if(!strcmp(key,SAHPI_DEFKEY))
INFO("If file is bad, Recover from backup or try sudo.");
else
INFO("If file is bad, Recover from backup.");
}
g_free(key);
return(out);
}
} else {
CRIT("Unknown Type %d",type);
g_free(plain_text);
g_free(key);
return(NULL);
}
g_free(key);
return(NULL);
}
#endif
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