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item_strfunc.cc
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/*
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
This program 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; version 2 of the License.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
@file
@brief
This file defines all string functions
@warning
Some string functions don't always put and end-null on a String.
(This shouldn't be needed)
*/
/* May include caustic 3rd-party defs. Use early, so it can override nothing. */
#include "sha2.h"
#include "my_global.h" // HAVE_*
#include "sql_priv.h"
/*
It is necessary to include set_var.h instead of item.h because there
are dependencies on include order for set_var.h and item.h. This
will be resolved later.
*/
#include "sql_class.h" // set_var.h: THD
#include "set_var.h"
#include "mysqld.h" // LOCK_uuid_generator
#include "sql_acl.h" // SUPER_ACL
#include "des_key_file.h" // st_des_keyschedule, st_des_keyblock
#include "password.h" // my_make_scrambled_password,
// my_make_scrambled_password_323
#include "crypt_genhash_impl.h"
#include <m_ctype.h>
#include <base64.h>
#include "my_md5.h"
#include "sha1.h"
#include "my_aes.h"
#include <zlib.h>
#include "my_rnd.h"
C_MODE_START
#include "../mysys/my_static.h" // For soundex_map
C_MODE_END
using std::min;
using std::max;
/*
For the Items which have only val_str_ascii() method
and don't have their own "native" val_str(),
we provide a "wrapper" method to convert from ASCII
to Item character set when it's necessary.
Conversion happens only in case of "tricky" Item character set (e.g. UCS2).
Normally conversion does not happen, and val_str_ascii() is immediately
returned instead.
*/
String *Item_str_func::val_str_from_val_str_ascii(String *str, String *str2)
{
DBUG_ASSERT(fixed == 1);
if (!(collation.collation->state & MY_CS_NONASCII))
{
String *res= val_str_ascii(str);
if (res)
res->set_charset(collation.collation);
return res;
}
DBUG_ASSERT(str != str2);
uint errors;
String *res= val_str_ascii(str);
if (!res)
return 0;
if ((null_value= str2->copy(res->ptr(), res->length(),
&my_charset_latin1, collation.collation,
&errors)))
return 0;
return str2;
}
bool Item_str_func::fix_fields(THD *thd, Item **ref)
{
bool res= Item_func::fix_fields(thd, ref);
/*
In Item_str_func::check_well_formed_result() we may set null_value
flag on the same condition as in test() below.
*/
maybe_null= (maybe_null || thd->is_strict_mode());
return res;
}
my_decimal *Item_str_func::val_decimal(my_decimal *decimal_value)
{
DBUG_ASSERT(fixed == 1);
char buff[64];
String *res, tmp(buff,sizeof(buff), &my_charset_bin);
res= val_str(&tmp);
if (!res)
return 0;
(void)str2my_decimal(E_DEC_FATAL_ERROR, (char*) res->ptr(),
res->length(), res->charset(), decimal_value);
return decimal_value;
}
double Item_str_func::val_real()
{
DBUG_ASSERT(fixed == 1);
int err_not_used;
char *end_not_used, buff[64];
String *res, tmp(buff,sizeof(buff), &my_charset_bin);
res= val_str(&tmp);
return res ? my_strntod(res->charset(), (char*) res->ptr(), res->length(),
&end_not_used, &err_not_used) : 0.0;
}
longlong Item_str_func::val_int()
{
DBUG_ASSERT(fixed == 1);
int err;
char buff[22];
String *res, tmp(buff,sizeof(buff), &my_charset_bin);
res= val_str(&tmp);
return (res ?
my_strntoll(res->charset(), res->ptr(), res->length(), 10, NULL,
&err) :
(longlong) 0);
}
String *Item_func_md5::val_str_ascii(String *str)
{
DBUG_ASSERT(fixed == 1);
String * sptr= args[0]->val_str(str);
str->set_charset(&my_charset_bin);
if (sptr)
{
uchar digest[MD5_HASH_SIZE];
null_value=0;
compute_md5_hash((char *) digest, (const char *) sptr->ptr(), sptr->length());
if (str->alloc(32)) // Ensure that memory is free
{
null_value=1;
return 0;
}
array_to_hex((char *) str->ptr(), digest, MD5_HASH_SIZE);
str->length((uint) 32);
return str;
}
null_value=1;
return 0;
}
/*
The MD5()/SHA() functions treat their parameter as being a case sensitive.
Thus we set binary collation on it so different instances of MD5() will be
compared properly.
*/
static CHARSET_INFO *get_checksum_charset(const char *csname)
{
CHARSET_INFO *cs= get_charset_by_csname(csname, MY_CS_BINSORT, MYF(0));
if (!cs)
{
// Charset has no binary collation: use my_charset_bin.
cs= &my_charset_bin;
}
return cs;
}
void Item_func_md5::fix_length_and_dec()
{
CHARSET_INFO *cs= get_checksum_charset(args[0]->collation.collation->csname);
args[0]->collation.set(cs, DERIVATION_COERCIBLE);
fix_length_and_charset(32, default_charset());
}
String *Item_func_sha::val_str_ascii(String *str)
{
DBUG_ASSERT(fixed == 1);
String * sptr= args[0]->val_str(str);
str->set_charset(&my_charset_bin);
if (sptr) /* If we got value different from NULL */
{
/* Temporary buffer to store 160bit digest */
uint8 digest[SHA1_HASH_SIZE];
compute_sha1_hash(digest, (const char *) sptr->ptr(), sptr->length());
/* Ensure that memory is free */
if (!(str->alloc(SHA1_HASH_SIZE * 2)))
{
array_to_hex((char *) str->ptr(), digest, SHA1_HASH_SIZE);
str->length((uint) SHA1_HASH_SIZE*2);
null_value=0;
return str;
}
}
null_value=1;
return 0;
}
void Item_func_sha::fix_length_and_dec()
{
CHARSET_INFO *cs= get_checksum_charset(args[0]->collation.collation->csname);
args[0]->collation.set(cs, DERIVATION_COERCIBLE);
// size of hex representation of hash
fix_length_and_charset(SHA1_HASH_SIZE * 2, default_charset());
}
String *Item_func_sha2::val_str_ascii(String *str)
{
DBUG_ASSERT(fixed == 1);
#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
unsigned char digest_buf[SHA512_DIGEST_LENGTH];
String *input_string;
unsigned char *input_ptr;
size_t input_len;
uint digest_length= 0;
str->set_charset(&my_charset_bin);
input_string= args[0]->val_str(str);
if (input_string == NULL)
{
null_value= TRUE;
return (String *) NULL;
}
null_value= args[0]->null_value;
if (null_value)
return (String *) NULL;
input_ptr= (unsigned char *) input_string->ptr();
input_len= input_string->length();
switch ((uint) args[1]->val_int()) {
#ifndef OPENSSL_NO_SHA512
case 512:
digest_length= SHA512_DIGEST_LENGTH;
(void) SHA512(input_ptr, input_len, digest_buf);
break;
case 384:
digest_length= SHA384_DIGEST_LENGTH;
(void) SHA384(input_ptr, input_len, digest_buf);
break;
#endif
#ifndef OPENSSL_NO_SHA256
case 224:
digest_length= SHA224_DIGEST_LENGTH;
(void) SHA224(input_ptr, input_len, digest_buf);
break;
case 256:
case 0: // SHA-256 is the default
digest_length= SHA256_DIGEST_LENGTH;
(void) SHA256(input_ptr, input_len, digest_buf);
break;
#endif
default:
if (!args[1]->const_item())
push_warning_printf(current_thd,
Sql_condition::WARN_LEVEL_WARN,
ER_WRONG_PARAMETERS_TO_NATIVE_FCT,
ER(ER_WRONG_PARAMETERS_TO_NATIVE_FCT), "sha2");
null_value= TRUE;
return NULL;
}
/*
Since we're subverting the usual String methods, we must make sure that
the destination has space for the bytes we're about to write.
*/
str->realloc((uint) digest_length*2 + 1); /* Each byte as two nybbles */
/* Convert the large number to a string-hex representation. */
array_to_hex((char *) str->ptr(), digest_buf, digest_length);
/* We poked raw bytes in. We must inform the the String of its length. */
str->length((uint) digest_length*2); /* Each byte as two nybbles */
null_value= FALSE;
return str;
#else
push_warning_printf(current_thd,
Sql_condition::WARN_LEVEL_WARN,
ER_FEATURE_DISABLED,
ER(ER_FEATURE_DISABLED),
"sha2", "--with-ssl");
null_value= TRUE;
return (String *) NULL;
#endif /* defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY) */
}
void Item_func_sha2::fix_length_and_dec()
{
maybe_null = 1;
max_length = 0;
#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
int sha_variant= args[1]->const_item() ? args[1]->val_int() : 512;
switch (sha_variant) {
#ifndef OPENSSL_NO_SHA512
case 512:
fix_length_and_charset(SHA512_DIGEST_LENGTH * 2, default_charset());
break;
case 384:
fix_length_and_charset(SHA384_DIGEST_LENGTH * 2, default_charset());
break;
#endif
#ifndef OPENSSL_NO_SHA256
case 256:
case 0: // SHA-256 is the default
fix_length_and_charset(SHA256_DIGEST_LENGTH * 2, default_charset());
break;
case 224:
fix_length_and_charset(SHA224_DIGEST_LENGTH * 2, default_charset());
break;
#endif
default:
push_warning_printf(current_thd,
Sql_condition::WARN_LEVEL_WARN,
ER_WRONG_PARAMETERS_TO_NATIVE_FCT,
ER(ER_WRONG_PARAMETERS_TO_NATIVE_FCT), "sha2");
}
CHARSET_INFO *cs= get_checksum_charset(args[0]->collation.collation->csname);
args[0]->collation.set(cs, DERIVATION_COERCIBLE);
#else
push_warning_printf(current_thd,
Sql_condition::WARN_LEVEL_WARN,
ER_FEATURE_DISABLED,
ER(ER_FEATURE_DISABLED),
"sha2", "--with-ssl");
#endif /* defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY) */
}
/* Implementation of AES encryption routines */
/** helper class to process an IV argument to aes_encrypt/aes_decrypt */
class iv_argument
{
char iv_buff[MY_AES_IV_SIZE + 1]; // +1 to cater for the terminating NULL
String tmp_iv_value;
public:
iv_argument() :
tmp_iv_value(iv_buff, sizeof(iv_buff), system_charset_info)
{}
/**
Validate the arguments and retrieve the IV value.
Processes a 3d optional IV argument to an Item_func function.
Contains all the necessary stack buffers etc.
@param aes_opmode the encryption mode
@param arg_count number of parameters passed to the function
@param args array of arguments passed to the function
@param func_name the name of the function (for errors)
@param thd the current thread (for errors)
@param [out] error_generated set to true if error was generated.
@return a pointer to the retrived validated IV or NULL
*/
const unsigned char *retrieve_iv_ptr(enum my_aes_opmode aes_opmode,
uint arg_count,
Item **args,
const char *func_name,
THD *thd,
my_bool *error_generated)
{
const unsigned char *iv_str= NULL;
*error_generated= FALSE;
if (my_aes_needs_iv(aes_opmode))
{
/* we only enforce the need for IV */
if (arg_count == 3)
{
String *iv= args[2]->val_str(&tmp_iv_value);
if (!iv || iv->length() < MY_AES_IV_SIZE)
{
my_error(ER_AES_INVALID_IV, MYF(0), func_name, (long long) MY_AES_IV_SIZE);
*error_generated= TRUE;
return NULL;
}
iv_str= (unsigned char *) iv->ptr();
}
else
{
my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), func_name);
*error_generated= TRUE;
return NULL;
}
}
else
{
if (arg_count == 3)
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
WARN_OPTION_IGNORED,
ER(WARN_OPTION_IGNORED), "IV");
}
}
return iv_str;
}
};
String *Item_func_aes_encrypt::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
char key_buff[80];
String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info);
String *sptr, *key;
int aes_length;
THD *thd= current_thd;
ulong aes_opmode;
iv_argument iv_arg;
DBUG_ENTER("Item_func_aes_decrypt::val_str");
sptr= args[0]->val_str(str); // String to encrypt
key= args[1]->val_str(&tmp_key_value); // key
aes_opmode= thd->variables.my_aes_mode;
DBUG_ASSERT(aes_opmode <= MY_AES_END);
if (sptr && key) // we need both arguments to be not NULL
{
const unsigned char *iv_str=
iv_arg.retrieve_iv_ptr((enum my_aes_opmode) aes_opmode, arg_count, args,
func_name(), thd, &null_value);
if (null_value)
DBUG_RETURN(NULL);
// Calculate result length
aes_length= my_aes_get_size(sptr->length(),
(enum my_aes_opmode) aes_opmode);
str_value.set_charset(&my_charset_bin);
if (!str_value.alloc(aes_length)) // Ensure that memory is free
{
// finally encrypt directly to allocated buffer.
if (my_aes_encrypt((unsigned char *) sptr->ptr(), sptr->length(),
(unsigned char *) str_value.ptr(),
(unsigned char *) key->ptr(), key->length(),
(enum my_aes_opmode) aes_opmode,
iv_str) == aes_length)
{
// We got the expected result length
str_value.length((uint) aes_length);
DBUG_RETURN(&str_value);
}
}
}
null_value=1;
DBUG_RETURN(0);
}
void Item_func_aes_encrypt::fix_length_and_dec()
{
ulong aes_opmode= current_thd->variables.my_aes_mode;
DBUG_ASSERT(aes_opmode <= MY_AES_END);
max_length=my_aes_get_size(args[0]->max_length,
(enum my_aes_opmode) aes_opmode);
}
String *Item_func_aes_decrypt::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
char key_buff[80];
String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info);
String *sptr, *key;
THD *thd= current_thd;
ulong aes_opmode;
iv_argument iv_arg;
DBUG_ENTER("Item_func_aes_decrypt::val_str");
sptr= args[0]->val_str(str); // String to decrypt
key= args[1]->val_str(&tmp_key_value); // Key
aes_opmode= thd->variables.my_aes_mode;
DBUG_ASSERT(aes_opmode <= MY_AES_END);
if (sptr && key) // Need to have both arguments not NULL
{
const unsigned char *iv_str=
iv_arg.retrieve_iv_ptr((enum my_aes_opmode) aes_opmode, arg_count, args,
func_name(), thd, &null_value);
if (null_value)
DBUG_RETURN(NULL);
str_value.set_charset(&my_charset_bin);
if (!str_value.alloc(sptr->length())) // Ensure that memory is free
{
// finally decrypt directly to allocated buffer.
int length;
length= my_aes_decrypt((unsigned char *) sptr->ptr(), sptr->length(),
(unsigned char *) str_value.ptr(),
(unsigned char *) key->ptr(), key->length(),
(enum my_aes_opmode) aes_opmode, iv_str);
if (length >= 0) // if we got correct data data
{
str_value.length((uint) length);
DBUG_RETURN(&str_value);
}
}
}
// Bad parameters. No memory or bad data will all go here
null_value=1;
DBUG_RETURN(0);
}
void Item_func_aes_decrypt::fix_length_and_dec()
{
max_length=args[0]->max_length;
maybe_null= 1;
}
/*
Artificially limited to 1k to avoid excessive memory usage.
The SSL lib supports up to INT_MAX.
*/
const longlong Item_func_random_bytes::MAX_RANDOM_BYTES_BUFFER= 1024;
void Item_func_random_bytes::fix_length_and_dec()
{
collation.set(&my_charset_bin);
max_length= MAX_RANDOM_BYTES_BUFFER;
}
String *Item_func_random_bytes::val_str(String *a)
{
DBUG_ASSERT(fixed == 1);
longlong n_bytes= args[0]->val_int();
null_value= args[0]->null_value;
if (null_value)
return NULL;
str_value.set_charset(&my_charset_bin);
if (n_bytes <= 0 || n_bytes > MAX_RANDOM_BYTES_BUFFER)
{
my_error(ER_DATA_OUT_OF_RANGE, MYF(0), "length", func_name());
null_value= TRUE;
return NULL;
}
if (str_value.alloc(n_bytes))
{
my_error(ER_OUTOFMEMORY, n_bytes);
null_value= TRUE;
return NULL;
}
str_value.set_charset(&my_charset_bin);
if (my_rand_buffer((unsigned char *) str_value.ptr(), n_bytes))
{
my_error(ER_ERROR_WHEN_EXECUTING_COMMAND, MYF(0), func_name(),
"SSL library can't generate random bytes");
null_value= TRUE;
return NULL;
}
str_value.length(n_bytes);
return &str_value;
}
void Item_func_to_base64::fix_length_and_dec()
{
maybe_null= args[0]->maybe_null;
collation.set(default_charset(), DERIVATION_COERCIBLE, MY_REPERTOIRE_ASCII);
if (args[0]->max_length > (uint) base64_encode_max_arg_length())
{
maybe_null= 1;
fix_char_length_ulonglong((ulonglong) base64_encode_max_arg_length());
}
else
{
uint64 length= base64_needed_encoded_length((uint64) args[0]->max_length);
DBUG_ASSERT(length > 0);
fix_char_length_ulonglong((ulonglong) length - 1);
}
}
String *Item_func_to_base64::val_str_ascii(String *str)
{
String *res= args[0]->val_str(str);
bool too_long= false;
uint64 length;
if (!res ||
res->length() > (uint) base64_encode_max_arg_length() ||
(too_long=
((uint64) (length= base64_needed_encoded_length((uint64) res->length())) >
current_thd->variables.max_allowed_packet)) ||
tmp_value.alloc((uint) length))
{
null_value= 1; // NULL input, too long input, or OOM.
if (too_long)
{
push_warning_printf(current_thd, Sql_condition::WARN_LEVEL_WARN,
ER_WARN_ALLOWED_PACKET_OVERFLOWED,
ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
current_thd->variables.max_allowed_packet);
}
return 0;
}
base64_encode(res->ptr(), (int) res->length(), (char*) tmp_value.ptr());
DBUG_ASSERT(length > 0);
tmp_value.length((uint) length - 1); // Without trailing '\0'
null_value= 0;
return &tmp_value;
}
void Item_func_from_base64::fix_length_and_dec()
{
if (args[0]->max_length > (uint) base64_decode_max_arg_length())
{
fix_char_length_ulonglong((ulonglong) base64_decode_max_arg_length());
}
else
{
uint64 length= base64_needed_decoded_length((uint64) args[0]->max_length);
fix_char_length_ulonglong((ulonglong) length);
}
maybe_null= 1; // Can be NULL, e.g. in case of badly formed input string
}
String *Item_func_from_base64::val_str(String *str)
{
String *res= args[0]->val_str_ascii(str);
bool too_long= false;
int64 length;
const char *end_ptr;
if (!res ||
res->length() > (uint) base64_decode_max_arg_length() ||
(too_long=
((uint64) (length= base64_needed_decoded_length((uint64) res->length())) >
current_thd->variables.max_allowed_packet)) ||
tmp_value.alloc((uint) length) ||
(length= base64_decode(res->ptr(), (uint64) res->length(),
(char *) tmp_value.ptr(), &end_ptr, 0)) < 0 ||
end_ptr < res->ptr() + res->length())
{
null_value= 1; // NULL input, too long input, OOM, or badly formed input
if (too_long)
{
push_warning_printf(current_thd, Sql_condition::WARN_LEVEL_WARN,
ER_WARN_ALLOWED_PACKET_OVERFLOWED,
ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
current_thd->variables.max_allowed_packet);
}
return 0;
}
tmp_value.length((uint) length);
null_value= 0;
return &tmp_value;
}
/**
Concatenate args with the following premises:
If only one arg (which is ok), return value of arg;
Don't reallocate val_str() if not absolute necessary.
*/
String *Item_func_concat::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String *res,*res2,*use_as_buff;
uint i;
bool is_const= 0;
null_value=0;
if (!(res=args[0]->val_str(str)))
goto null;
use_as_buff= &tmp_value;
/* Item_subselect in --ps-protocol mode will state it as a non-const */
is_const= args[0]->const_item() || !args[0]->used_tables();
for (i=1 ; i < arg_count ; i++)
{
if (res->length() == 0)
{
if (!(res=args[i]->val_str(str)))
goto null;
/*
CONCAT accumulates its result in the result of its the first
non-empty argument. Because of this we need is_const to be
evaluated only for it.
*/
is_const= args[i]->const_item() || !args[i]->used_tables();
}
else
{
if (!(res2=args[i]->val_str(use_as_buff)))
goto null;
if (res2->length() == 0)
continue;
if (res->length()+res2->length() >
current_thd->variables.max_allowed_packet)
{
push_warning_printf(current_thd, Sql_condition::WARN_LEVEL_WARN,
ER_WARN_ALLOWED_PACKET_OVERFLOWED,
ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
current_thd->variables.max_allowed_packet);
goto null;
}
if (!is_const && res->alloced_length() >= res->length()+res2->length())
{ // Use old buffer
res->append(*res2);
}
else if (str->alloced_length() >= res->length()+res2->length())
{
if (str->ptr() == res2->ptr())
str->replace(0,0,*res);
else
{
// If res2 is a substring of str, then clone it first.
char buff[STRING_BUFFER_USUAL_SIZE];
String res2_clone(buff, sizeof(buff), system_charset_info);
if (res2->uses_buffer_owned_by(str))
{
if (res2_clone.copy(*res2))
goto null;
res2= &res2_clone;
}
str->copy(*res);
str->append(*res2);
}
res= str;
use_as_buff= &tmp_value;
}
else if (res == &tmp_value)
{
if (res->append(*res2)) // Must be a blob
goto null;
}
else if (res2 == &tmp_value)
{ // This can happend only 1 time
if (tmp_value.replace(0,0,*res))
goto null;
res= &tmp_value;
use_as_buff=str; // Put next arg here
}
else if (tmp_value.is_alloced() && res2->ptr() >= tmp_value.ptr() &&
res2->ptr() <= tmp_value.ptr() + tmp_value.alloced_length())
{
/*
This happens really seldom:
In this case res2 is sub string of tmp_value. We will
now work in place in tmp_value to set it to res | res2
*/
/* Chop the last characters in tmp_value that isn't in res2 */
tmp_value.length((uint32) (res2->ptr() - tmp_value.ptr()) +
res2->length());
/* Place res2 at start of tmp_value, remove chars before res2 */
if (tmp_value.replace(0,(uint32) (res2->ptr() - tmp_value.ptr()),
*res))
goto null;
res= &tmp_value;
use_as_buff=str; // Put next arg here
}
else
{ // Two big const strings
/*
NOTE: We should be prudent in the initial allocation unit -- the
size of the arguments is a function of data distribution, which
can be any. Instead of overcommitting at the first row, we grow
the allocated amount by the factor of 2. This ensures that no
more than 25% of memory will be overcommitted on average.
*/
uint concat_len= res->length() + res2->length();
if (tmp_value.alloced_length() < concat_len)
{
if (tmp_value.alloced_length() == 0)
{
if (tmp_value.alloc(concat_len))
goto null;
}
else
{
uint new_len = max(tmp_value.alloced_length() * 2, concat_len);
if (tmp_value.realloc(new_len))
goto null;
}
}
if (tmp_value.copy(*res) || tmp_value.append(*res2))
goto null;
res= &tmp_value;
use_as_buff=str;
}
is_const= 0;
}
}
res->set_charset(collation.collation);
return res;
null:
null_value=1;
return 0;
}
void Item_func_concat::fix_length_and_dec()
{
ulonglong char_length= 0;
if (agg_arg_charsets_for_string_result(collation, args, arg_count))
return;
for (uint i=0 ; i < arg_count ; i++)
char_length+= args[i]->max_char_length();
fix_char_length_ulonglong(char_length);
}
/**
@details
Function des_encrypt() by [email protected] & monty
Works only if compiled with OpenSSL library support.
@return
A binary string where first character is CHAR(128 | key-number).
If one uses a string key key_number is 127.
Encryption result is longer than original by formula:
@code new_length= org_length + (8-(org_length % 8))+1 @endcode
*/
String *Item_func_des_encrypt::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
uint code= ER_WRONG_PARAMETERS_TO_PROCEDURE;
DES_cblock ivec;
struct st_des_keyblock keyblock;
struct st_des_keyschedule keyschedule;
const char *append_str="********";
uint key_number, res_length, tail;
String *res= args[0]->val_str(str);
if ((null_value= args[0]->null_value))
return 0; // ENCRYPT(NULL) == NULL
if ((res_length=res->length()) == 0)
return make_empty_result();
if (arg_count == 1)
{
/* Protect against someone doing FLUSH DES_KEY_FILE */
mysql_mutex_lock(&LOCK_des_key_file);
keyschedule= des_keyschedule[key_number=des_default_key];
mysql_mutex_unlock(&LOCK_des_key_file);
}
else if (args[1]->result_type() == INT_RESULT)
{
key_number= (uint) args[1]->val_int();
if (key_number > 9)
goto error;
mysql_mutex_lock(&LOCK_des_key_file);
keyschedule= des_keyschedule[key_number];
mysql_mutex_unlock(&LOCK_des_key_file);
}
else
{
String *keystr=args[1]->val_str(&tmp_value);
if (!keystr)
goto error;
key_number=127; // User key string
/* We make good 24-byte (168 bit) key from given plaintext key with MD5 */
memset(&ivec, 0, sizeof(ivec));
EVP_BytesToKey(EVP_des_ede3_cbc(),EVP_md5(),NULL,
(uchar*) keystr->ptr(), (int) keystr->length(),
1, (uchar*) &keyblock,ivec);
DES_set_key_unchecked(&keyblock.key1,&keyschedule.ks1);
DES_set_key_unchecked(&keyblock.key2,&keyschedule.ks2);
DES_set_key_unchecked(&keyblock.key3,&keyschedule.ks3);
}
/*
The problem: DES algorithm requires original data to be in 8-bytes
chunks. Missing bytes get filled with '*'s and result of encryption
can be up to 8 bytes longer than original string. When decrypted,
we do not know the size of original string :(
We add one byte with value 0x1..0x8 as the last byte of the padded
string marking change of string length.
*/
tail= 8 - (res_length % 8); // 1..8 marking extra length
res_length+=tail;
tmp_arg.realloc(res_length);
tmp_arg.length(0);
tmp_arg.append(res->ptr(), res->length());
code= ER_OUT_OF_RESOURCES;
if (tmp_arg.append(append_str, tail) || tmp_value.alloc(res_length+1))
goto error;
tmp_arg[res_length-1]=tail; // save extra length
tmp_value.realloc(res_length+1);
tmp_value.length(res_length+1);
tmp_value.set_charset(&my_charset_bin);
tmp_value[0]=(char) (128 | key_number);
// Real encryption
memset(&ivec, 0, sizeof(ivec));
DES_ede3_cbc_encrypt((const uchar*) (tmp_arg.ptr()),
(uchar*) (tmp_value.ptr()+1),
res_length,
&keyschedule.ks1,
&keyschedule.ks2,
&keyschedule.ks3,
&ivec, TRUE);
return &tmp_value;
error:
push_warning_printf(current_thd,Sql_condition::WARN_LEVEL_WARN,
code, ER(code),
"des_encrypt");
#else
push_warning_printf(current_thd,Sql_condition::WARN_LEVEL_WARN,
ER_FEATURE_DISABLED, ER(ER_FEATURE_DISABLED),
"des_encrypt", "--with-ssl");
#endif /* defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY) */
null_value=1;
return 0;
}
String *Item_func_des_decrypt::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
uint code= ER_WRONG_PARAMETERS_TO_PROCEDURE;
DES_cblock ivec;
struct st_des_keyblock keyblock;
struct st_des_keyschedule keyschedule;
String *res= args[0]->val_str(str);
uint length,tail;
if ((null_value= args[0]->null_value))
return 0;
length= res->length();
if (length < 9 || (length % 8) != 1 || !((*res)[0] & 128))
return res; // Skip decryption if not encrypted
if (arg_count == 1) // If automatic uncompression
{
uint key_number=(uint) (*res)[0] & 127;
// Check if automatic key and that we have privilege to uncompress using it
if (!(current_thd->security_ctx->master_access & SUPER_ACL) ||
key_number > 9)
goto error;
mysql_mutex_lock(&LOCK_des_key_file);
keyschedule= des_keyschedule[key_number];
mysql_mutex_unlock(&LOCK_des_key_file);
}
else
{
// We make good 24-byte (168 bit) key from given plaintext key with MD5
String *keystr=args[1]->val_str(&tmp_value);
if (!keystr)
goto error;