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236 lines
4.7 KiB
C
236 lines
4.7 KiB
C
/*
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* px-crypt.c
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* Wrapper for various crypt algorithms.
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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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* $Id: px-crypt.c,v 1.1 2001/08/21 01:32:01 momjian Exp $
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*/
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#include <postgres.h>
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#include "px-crypt.h"
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#ifndef PX_SYSTEM_CRYPT
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static char *
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run_crypt_des(const char *psw, const char *salt,
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char *buf, unsigned len)
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{
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char *res;
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res = px_crypt_des(psw, salt);
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if (strlen(res) > len - 1)
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return NULL;
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strcpy(buf, res);
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return buf;
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}
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static char *
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run_crypt_md5(const char *psw, const char *salt,
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char *buf, unsigned len)
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{
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char *res;
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res = px_crypt_md5(psw, salt, buf, len);
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return res;
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}
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static char *
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run_crypt_bf(const char *psw, const char *salt,
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char *buf, unsigned len)
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{
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char *res;
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res = _crypt_blowfish_rn(psw, salt, buf, len);
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if (!res)
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return NULL;
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strcpy(buf, res);
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return buf;
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}
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static struct
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{
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char *id;
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unsigned id_len;
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char *(*crypt) (const char *psw, const char *salt,
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char *buf, unsigned len);
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} px_crypt_list[] =
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{
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{ "$2a$", 4, run_crypt_bf },
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{ "$2$", 3, NULL }, /* N/A */
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{ "$1$", 3, run_crypt_md5 },
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{ "_", 1, run_crypt_des },
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{ "", 0, run_crypt_des },
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{ NULL, 0, NULL }
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};
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char *
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px_crypt(const char *psw, const char *salt, char *buf, unsigned len)
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{
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int i;
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for (i = 0; px_crypt_list[i].id; i++)
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{
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if (!px_crypt_list[i].id_len)
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break;
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if (!strncmp(salt, px_crypt_list[i].id, px_crypt_list[i].id_len))
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break;
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}
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if (px_crypt_list[i].crypt == NULL)
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return NULL;
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return px_crypt_list[i].crypt(psw, salt, buf, len);
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}
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#else /* PX_SYSTEM_CRYPT */
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extern char *crypt(const char *psw, const char *salt);
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char *
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px_crypt(const char *psw, const char *salt,
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char *buf, unsigned len)
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{
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char *res;
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res = crypt(psw, salt);
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if (!res || strlen(res) >= len)
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return NULL;
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strcpy(buf, res);
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return buf;
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}
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#endif
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/*
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* salt generators
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*/
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static int my_rand64()
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{
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return random() % 64;
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}
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static uint
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gen_des_salt(char *buf)
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{
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buf[0] = px_crypt_a64[my_rand64()];
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buf[1] = px_crypt_a64[my_rand64()];
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buf[2] = 0;
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return 2;
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}
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static uint
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gen_xdes_salt(char *buf)
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{
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strcpy(buf, "_12345678");
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px_crypt_to64(buf+1, (long)PX_XDES_ROUNDS, 4);
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px_crypt_to64(buf+5, random(), 4);
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return 9;
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}
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static uint
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gen_md5_salt(char *buf)
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{
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int i;
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strcpy(buf, "$1$12345678$");
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for (i = 0; i < 8; i++)
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buf[3 + i] = px_crypt_a64[my_rand64()];
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return 12;
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}
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static uint
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gen_bf_salt(char *buf)
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{
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int i, count;
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char *s;
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char saltbuf[16+3];
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unsigned slen = 16;
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uint32 *v;
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for (i = 0; i < slen; i++)
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saltbuf[i] = random() & 255;
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saltbuf[16] = 0;
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saltbuf[17] = 0;
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saltbuf[18] = 0;
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strcpy(buf, "$2a$00$0123456789012345678901");
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count = PX_BF_ROUNDS;
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buf[4] = '0' + count / 10;
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buf[5] = '0' + count % 10;
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s = buf + 7;
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for (i = 0; i < slen; )
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{
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v = (uint32 *)&saltbuf[i];
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if (i + 3 <= slen)
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px_crypt_to64(s, *v, 4);
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else
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/* slen-i could be 1,2 make it 2,3 */
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px_crypt_to64(s, *v, slen-i+1);
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s += 4;
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i += 3;
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}
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s = buf;
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/*s = _crypt_gensalt_blowfish_rn(count, saltbuf, 16, buf, PX_MAX_CRYPT);*/
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return s ? strlen(s) : 0;
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}
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struct generator {
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char *name;
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uint (*gen)(char *buf);
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};
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static struct generator gen_list [] = {
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{ "des", gen_des_salt },
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{ "md5", gen_md5_salt },
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{ "xdes", gen_xdes_salt },
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{ "bf", gen_bf_salt },
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{ NULL, NULL }
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};
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uint
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px_gen_salt(const char *salt_type, char *buf)
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{
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int i;
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struct generator *g;
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for (i = 0; gen_list[i].name; i++) {
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g = &gen_list[i];
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if (!strcasecmp(g->name, salt_type))
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return g->gen(buf);
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}
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return 0;
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}
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