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220db7ccd8
strings. This patch introduces four support functions cstring_to_text, cstring_to_text_with_len, text_to_cstring, and text_to_cstring_buffer, and two macros CStringGetTextDatum and TextDatumGetCString. A number of existing macros that provided variants on these themes were removed. Most of the places that need to make such conversions now require just one function or macro call, in place of the multiple notational layers that used to be needed. There are no longer any direct calls of textout or textin, and we got most of the places that were using handmade conversions via memcpy (there may be a few still lurking, though). This commit doesn't make any serious effort to eliminate transient memory leaks caused by detoasting toasted text objects before they reach text_to_cstring. We changed PG_GETARG_TEXT_P to PG_GETARG_TEXT_PP in a few places where it was easy, but much more could be done. Brendan Jurd and Tom Lane
471 lines
11 KiB
C
471 lines
11 KiB
C
/*
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* pgcrypto.c
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* Various cryptographic stuff for PostgreSQL.
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*
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* Copyright (c) 2001 Marko Kreen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $PostgreSQL: pgsql/contrib/pgcrypto/pgcrypto.c,v 1.27 2008/03/25 22:42:41 tgl Exp $
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*/
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#include "postgres.h"
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#include <ctype.h>
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#include "fmgr.h"
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#include "parser/scansup.h"
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#include "utils/builtins.h"
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#include "px.h"
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#include "px-crypt.h"
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#include "pgcrypto.h"
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PG_MODULE_MAGIC;
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/* private stuff */
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typedef int (*PFN) (const char *name, void **res);
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static void *find_provider(text *name, PFN pf, char *desc, int silent);
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/* SQL function: hash(bytea, text) returns bytea */
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PG_FUNCTION_INFO_V1(pg_digest);
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Datum
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pg_digest(PG_FUNCTION_ARGS)
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{
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bytea *arg;
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text *name;
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unsigned len,
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hlen;
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PX_MD *md;
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bytea *res;
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name = PG_GETARG_TEXT_P(1);
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/* will give error if fails */
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md = find_provider(name, (PFN) px_find_digest, "Digest", 0);
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hlen = px_md_result_size(md);
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res = (text *) palloc(hlen + VARHDRSZ);
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SET_VARSIZE(res, hlen + VARHDRSZ);
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arg = PG_GETARG_BYTEA_P(0);
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len = VARSIZE(arg) - VARHDRSZ;
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px_md_update(md, (uint8 *) VARDATA(arg), len);
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px_md_finish(md, (uint8 *) VARDATA(res));
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px_md_free(md);
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PG_FREE_IF_COPY(arg, 0);
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PG_FREE_IF_COPY(name, 1);
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PG_RETURN_BYTEA_P(res);
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}
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/* SQL function: hmac(data:bytea, key:bytea, type:text) returns bytea */
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PG_FUNCTION_INFO_V1(pg_hmac);
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Datum
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pg_hmac(PG_FUNCTION_ARGS)
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{
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bytea *arg;
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bytea *key;
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text *name;
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unsigned len,
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hlen,
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klen;
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PX_HMAC *h;
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bytea *res;
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name = PG_GETARG_TEXT_P(2);
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/* will give error if fails */
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h = find_provider(name, (PFN) px_find_hmac, "HMAC", 0);
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hlen = px_hmac_result_size(h);
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res = (text *) palloc(hlen + VARHDRSZ);
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SET_VARSIZE(res, hlen + VARHDRSZ);
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arg = PG_GETARG_BYTEA_P(0);
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key = PG_GETARG_BYTEA_P(1);
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len = VARSIZE(arg) - VARHDRSZ;
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klen = VARSIZE(key) - VARHDRSZ;
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px_hmac_init(h, (uint8 *) VARDATA(key), klen);
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px_hmac_update(h, (uint8 *) VARDATA(arg), len);
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px_hmac_finish(h, (uint8 *) VARDATA(res));
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px_hmac_free(h);
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PG_FREE_IF_COPY(arg, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_FREE_IF_COPY(name, 2);
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PG_RETURN_BYTEA_P(res);
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}
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/* SQL function: pg_gen_salt(text) returns text */
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PG_FUNCTION_INFO_V1(pg_gen_salt);
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Datum
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pg_gen_salt(PG_FUNCTION_ARGS)
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{
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text *arg0 = PG_GETARG_TEXT_PP(0);
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int len;
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char buf[PX_MAX_SALT_LEN + 1];
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text_to_cstring_buffer(arg0, buf, sizeof(buf));
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len = px_gen_salt(buf, buf, 0);
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if (len < 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("gen_salt: %s", px_strerror(len))));
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PG_FREE_IF_COPY(arg0, 0);
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PG_RETURN_TEXT_P(cstring_to_text_with_len(buf, len));
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}
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/* SQL function: pg_gen_salt(text, int4) returns text */
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PG_FUNCTION_INFO_V1(pg_gen_salt_rounds);
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Datum
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pg_gen_salt_rounds(PG_FUNCTION_ARGS)
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{
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text *arg0 = PG_GETARG_TEXT_PP(0);
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int rounds = PG_GETARG_INT32(1);
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int len;
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char buf[PX_MAX_SALT_LEN + 1];
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text_to_cstring_buffer(arg0, buf, sizeof(buf));
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len = px_gen_salt(buf, buf, rounds);
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if (len < 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("gen_salt: %s", px_strerror(len))));
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PG_FREE_IF_COPY(arg0, 0);
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PG_RETURN_TEXT_P(cstring_to_text_with_len(buf, len));
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}
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/* SQL function: pg_crypt(psw:text, salt:text) returns text */
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PG_FUNCTION_INFO_V1(pg_crypt);
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Datum
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pg_crypt(PG_FUNCTION_ARGS)
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{
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text *arg0 = PG_GETARG_TEXT_PP(0);
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text *arg1 = PG_GETARG_TEXT_PP(1);
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char *buf0,
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*buf1,
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*cres,
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*resbuf;
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text *res;
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buf0 = text_to_cstring(arg0);
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buf1 = text_to_cstring(arg1);
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resbuf = palloc0(PX_MAX_CRYPT);
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cres = px_crypt(buf0, buf1, resbuf, PX_MAX_CRYPT);
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pfree(buf0);
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pfree(buf1);
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if (cres == NULL)
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ereport(ERROR,
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(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
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errmsg("crypt(3) returned NULL")));
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res = cstring_to_text(cres);
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pfree(resbuf);
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PG_FREE_IF_COPY(arg0, 0);
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PG_FREE_IF_COPY(arg1, 1);
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PG_RETURN_TEXT_P(res);
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}
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/* SQL function: pg_encrypt(bytea, bytea, text) returns bytea */
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PG_FUNCTION_INFO_V1(pg_encrypt);
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Datum
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pg_encrypt(PG_FUNCTION_ARGS)
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{
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int err;
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bytea *data,
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*key,
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*res;
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text *type;
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PX_Combo *c;
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unsigned dlen,
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klen,
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rlen;
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type = PG_GETARG_TEXT_P(2);
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c = find_provider(type, (PFN) px_find_combo, "Cipher", 0);
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data = PG_GETARG_BYTEA_P(0);
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key = PG_GETARG_BYTEA_P(1);
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dlen = VARSIZE(data) - VARHDRSZ;
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klen = VARSIZE(key) - VARHDRSZ;
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rlen = px_combo_encrypt_len(c, dlen);
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res = palloc(VARHDRSZ + rlen);
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err = px_combo_init(c, (uint8 *) VARDATA(key), klen, NULL, 0);
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if (!err)
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err = px_combo_encrypt(c, (uint8 *) VARDATA(data), dlen,
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(uint8 *) VARDATA(res), &rlen);
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px_combo_free(c);
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PG_FREE_IF_COPY(data, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_FREE_IF_COPY(type, 2);
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if (err)
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{
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pfree(res);
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ereport(ERROR,
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(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
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errmsg("encrypt error: %s", px_strerror(err))));
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}
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SET_VARSIZE(res, VARHDRSZ + rlen);
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PG_RETURN_BYTEA_P(res);
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}
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/* SQL function: pg_decrypt(bytea, bytea, text) returns bytea */
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PG_FUNCTION_INFO_V1(pg_decrypt);
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Datum
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pg_decrypt(PG_FUNCTION_ARGS)
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{
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int err;
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bytea *data,
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*key,
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*res;
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text *type;
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PX_Combo *c;
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unsigned dlen,
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klen,
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rlen;
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type = PG_GETARG_TEXT_P(2);
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c = find_provider(type, (PFN) px_find_combo, "Cipher", 0);
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data = PG_GETARG_BYTEA_P(0);
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key = PG_GETARG_BYTEA_P(1);
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dlen = VARSIZE(data) - VARHDRSZ;
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klen = VARSIZE(key) - VARHDRSZ;
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rlen = px_combo_decrypt_len(c, dlen);
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res = palloc(VARHDRSZ + rlen);
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err = px_combo_init(c, (uint8 *) VARDATA(key), klen, NULL, 0);
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if (!err)
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err = px_combo_decrypt(c, (uint8 *) VARDATA(data), dlen,
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(uint8 *) VARDATA(res), &rlen);
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px_combo_free(c);
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if (err)
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ereport(ERROR,
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(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
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errmsg("decrypt error: %s", px_strerror(err))));
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SET_VARSIZE(res, VARHDRSZ + rlen);
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PG_FREE_IF_COPY(data, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_FREE_IF_COPY(type, 2);
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PG_RETURN_BYTEA_P(res);
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}
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/* SQL function: pg_encrypt_iv(bytea, bytea, bytea, text) returns bytea */
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PG_FUNCTION_INFO_V1(pg_encrypt_iv);
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Datum
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pg_encrypt_iv(PG_FUNCTION_ARGS)
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{
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int err;
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bytea *data,
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*key,
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*iv,
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*res;
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text *type;
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PX_Combo *c;
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unsigned dlen,
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klen,
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ivlen,
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rlen;
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type = PG_GETARG_TEXT_P(3);
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c = find_provider(type, (PFN) px_find_combo, "Cipher", 0);
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data = PG_GETARG_BYTEA_P(0);
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key = PG_GETARG_BYTEA_P(1);
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iv = PG_GETARG_BYTEA_P(2);
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dlen = VARSIZE(data) - VARHDRSZ;
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klen = VARSIZE(key) - VARHDRSZ;
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ivlen = VARSIZE(iv) - VARHDRSZ;
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rlen = px_combo_encrypt_len(c, dlen);
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res = palloc(VARHDRSZ + rlen);
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err = px_combo_init(c, (uint8 *) VARDATA(key), klen,
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(uint8 *) VARDATA(iv), ivlen);
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if (!err)
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px_combo_encrypt(c, (uint8 *) VARDATA(data), dlen,
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(uint8 *) VARDATA(res), &rlen);
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px_combo_free(c);
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if (err)
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ereport(ERROR,
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(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
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errmsg("encrypt_iv error: %s", px_strerror(err))));
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SET_VARSIZE(res, VARHDRSZ + rlen);
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PG_FREE_IF_COPY(data, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_FREE_IF_COPY(iv, 2);
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PG_FREE_IF_COPY(type, 3);
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PG_RETURN_BYTEA_P(res);
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}
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/* SQL function: pg_decrypt_iv(bytea, bytea, bytea, text) returns bytea */
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PG_FUNCTION_INFO_V1(pg_decrypt_iv);
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Datum
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pg_decrypt_iv(PG_FUNCTION_ARGS)
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{
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int err;
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bytea *data,
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*key,
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*iv,
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*res;
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text *type;
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PX_Combo *c;
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unsigned dlen,
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klen,
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rlen,
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ivlen;
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type = PG_GETARG_TEXT_P(3);
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c = find_provider(type, (PFN) px_find_combo, "Cipher", 0);
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data = PG_GETARG_BYTEA_P(0);
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key = PG_GETARG_BYTEA_P(1);
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iv = PG_GETARG_BYTEA_P(2);
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dlen = VARSIZE(data) - VARHDRSZ;
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klen = VARSIZE(key) - VARHDRSZ;
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ivlen = VARSIZE(iv) - VARHDRSZ;
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rlen = px_combo_decrypt_len(c, dlen);
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res = palloc(VARHDRSZ + rlen);
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err = px_combo_init(c, (uint8 *) VARDATA(key), klen,
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(uint8 *) VARDATA(iv), ivlen);
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if (!err)
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px_combo_decrypt(c, (uint8 *) VARDATA(data), dlen,
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(uint8 *) VARDATA(res), &rlen);
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px_combo_free(c);
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if (err)
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ereport(ERROR,
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(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
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errmsg("decrypt_iv error: %s", px_strerror(err))));
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SET_VARSIZE(res, VARHDRSZ + rlen);
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PG_FREE_IF_COPY(data, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_FREE_IF_COPY(iv, 2);
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PG_FREE_IF_COPY(type, 3);
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PG_RETURN_BYTEA_P(res);
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}
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/* SQL function: pg_random_bytes(int4) returns bytea */
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PG_FUNCTION_INFO_V1(pg_random_bytes);
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Datum
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pg_random_bytes(PG_FUNCTION_ARGS)
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{
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int err;
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int len = PG_GETARG_INT32(0);
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bytea *res;
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if (len < 1 || len > 1024)
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ereport(ERROR,
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(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
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errmsg("Length not in range")));
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res = palloc(VARHDRSZ + len);
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SET_VARSIZE(res, VARHDRSZ + len);
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/* generate result */
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err = px_get_random_bytes((uint8 *) VARDATA(res), len);
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if (err < 0)
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ereport(ERROR,
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(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
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errmsg("Random generator error: %s", px_strerror(err))));
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PG_RETURN_BYTEA_P(res);
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}
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static void *
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find_provider(text *name,
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PFN provider_lookup,
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char *desc, int silent)
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{
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void *res;
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char *buf;
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int err;
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buf = downcase_truncate_identifier(VARDATA(name),
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VARSIZE(name) - VARHDRSZ,
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false);
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err = provider_lookup(buf, &res);
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if (err && !silent)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("Cannot use \"%s\": %s", buf, px_strerror(err))));
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pfree(buf);
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return err ? NULL : res;
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}
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