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encrypt.c
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#include "postgres.h"
#include <string.h>
#include "fmgr.h"
#include "utils/builtins.h"
#include "utils/guc.h"
PG_MODULE_MAGIC;
/* GUC variables */
static char *vault_addr = NULL;
static char *vault_token = NULL;
static char *vault_transit_engine_path = NULL;
static char *vault_transit_key_name = NULL;
static bool vault_tls_skip_verify = false;
PG_FUNCTION_INFO_V1(encrypt);
PG_FUNCTION_INFO_V1(decrypt);
PG_FUNCTION_INFO_V1(encryptin);
PG_FUNCTION_INFO_V1(decryptout);
/*
* Module load callback
*/
void _PG_init(void)
{
/* Define custom GUC variables. */
DefineCustomStringVariable("pg_vault_encrypt.vault_addr",
"The address of the Vault server.",
NULL,
&vault_addr,
"",
PGC_SUSET,
0,
NULL,
NULL,
NULL);
DefineCustomStringVariable("pg_vault_encrypt.vault_token",
"The token to communicate with the Vault server.",
NULL,
&vault_token,
"",
PGC_USERSET,
0,
NULL,
NULL,
NULL);
DefineCustomStringVariable("pg_vault_encrypt.vault_transit_engine_path",
"The path of Transit Secret Engine.",
NULL,
&vault_transit_engine_path,
"",
PGC_SUSET,
0,
NULL,
NULL,
NULL);
DefineCustomStringVariable("pg_vault_encrypt.vault_transit_key_name",
"The key name of Transit secret engine.",
NULL,
&vault_transit_key_name,
"",
PGC_SUSET,
0,
NULL,
NULL,
NULL);
DefineCustomBoolVariable("pg_vault_encrypt.vault_tls_skip_verify",
"Do not verify Vault's presented certificate before communicating with it.",
NULL,
&vault_tls_skip_verify,
false,
PGC_SUSET,
0,
NULL,
NULL,
NULL);
EmitWarningsOnPlaceholders("pg_vault_encrypt");
}
Datum
encrypt(PG_FUNCTION_ARGS)
{
char *enc_result, *result = NULL;
size_t enc_result_len = 0;
char *str = PG_GETARG_CSTRING(0);
/*** for debug info ****/
ereport(DEBUG1, errmsg("encrypt:text : '%s'\n", str));
ereport(DEBUG1, errmsg("encrypt:text(addr): '%x'\n", str));
ereport(DEBUG1, errmsg("encrypt:text(len) : '%d'\n", strlen(str)));
ereport(DEBUG1, errmsg("encrypt:call VaultEncrypt\n"));
(void)VaultEncrypt(str, vault_addr, vault_token, vault_transit_engine_path, vault_transit_key_name, vault_tls_skip_verify, &enc_result);
ereport(DEBUG1, errmsg("encrypt:cipher_text : '%s'\n", enc_result));
ereport(DEBUG1, errmsg("encrypt:cipher_text(addr): '%x'\n", enc_result));
enc_result_len = strlen(enc_result);
ereport(DEBUG1, errmsg("encrypt:cipher_text(len) : '%d'\n", enc_result_len));
result = (char *)palloc(enc_result_len + 1);
strcpy(result, enc_result);
free(enc_result);
PG_RETURN_CSTRING(result);
}
Datum
decrypt(PG_FUNCTION_ARGS)
{
char *dec_result, *result = NULL;
size_t dec_result_len = 0;
char *str = PG_GETARG_CSTRING(0);
/*** for debug ****/
ereport(DEBUG1, errmsg("decrypt:cipher_text : '%s'\n", str));
ereport(DEBUG1, errmsg("decrypt:cipher_text(addr): '%x'\n", str));
ereport(DEBUG1, errmsg("decrypt:cipher_text(len) : '%d'\n", strlen(str)));
ereport(DEBUG1, errmsg("decrypt:call VaultDecrypt\n"));
(void)VaultDecrypt(str, vault_addr, vault_token, vault_transit_engine_path, vault_transit_key_name, vault_tls_skip_verify, &dec_result);
ereport(DEBUG1, errmsg("decrypt:text : '%s'\n", dec_result));
ereport(DEBUG1, errmsg("decrypt:text(addr): '%x'\n", dec_result));
dec_result_len = strlen(dec_result);
ereport(DEBUG1, errmsg("decrypt:text(len) : '%d'\n", dec_result_len));
result = (char *)palloc(dec_result_len + 1);
strcpy(result, dec_result);
free(dec_result);
PG_RETURN_CSTRING(result);
}
Datum
encryptin(PG_FUNCTION_ARGS)
{
char *enc_result = NULL;
size_t enc_result_len = 0;
char *str = PG_GETARG_CSTRING(0);
/*** for debug ****/
ereport(DEBUG1, errmsg("encryptin:text : '%s'\n", str));
ereport(DEBUG1, errmsg("encryptin:text(addr): '%x'\n", str));
ereport(DEBUG1, errmsg("encryptin:text(len) : '%d'\n", strlen(str)));
ereport(DEBUG1, errmsg("encryptin:call VaultEncrypt\n"));
(void)VaultEncrypt(str, vault_addr, vault_token, vault_transit_engine_path, vault_transit_key_name, vault_tls_skip_verify, &enc_result);
ereport(DEBUG1, errmsg("encryptin:cipher_text : '%s'\n", enc_result));
ereport(DEBUG1, errmsg("encryptin:cipher_text(addr): '%x'\n", enc_result));
enc_result_len = strlen(enc_result);
ereport(DEBUG1, errmsg("encryptin:cipher_text(len) : '%d'\n", enc_result_len));
text *result = cstring_to_text(enc_result);
free(enc_result);
PG_RETURN_TEXT_P(result);
}
Datum
decryptout(PG_FUNCTION_ARGS)
{
char *dec_result, *result = NULL;
size_t dec_result_len = 0;
Datum txt = PG_GETARG_DATUM(0);
/*** for debug ****/
ereport(DEBUG1, errmsg("decryptout:cipher_text : '%s'\n", TextDatumGetCString(txt)));
ereport(DEBUG1, errmsg("decryptout:cipher_text(addr): '%x'\n", TextDatumGetCString(txt)));
ereport(DEBUG1, errmsg("decryptout:cipher_text(len) : '%d'\n", strlen(TextDatumGetCString(txt))));
ereport(DEBUG1, errmsg("decryptout:call VaultDecrypt\n"));
(void)VaultDecrypt(TextDatumGetCString(txt), vault_addr, vault_token, vault_transit_engine_path, vault_transit_key_name, vault_tls_skip_verify, &dec_result);
ereport(DEBUG1, errmsg("decryptout:text : '%s'\n", dec_result));
ereport(DEBUG1, errmsg("decryptout:text(addr): '%x'\n", dec_result));
dec_result_len = strlen(dec_result);
ereport(DEBUG1, errmsg("decryptout:text(len) : '%d'\n", dec_result_len));
result = (char *)palloc(dec_result_len + 1);
strcpy(result, dec_result);
free(dec_result);
PG_RETURN_CSTRING(result);
}