/* vi: set sw=4 ts=4: */ /* * The one and only crypt(3) function. * * This source code is derived from Minix's pwdauth.c, which was based * on Andy Tanenbaum's book "Computer Networks", and then rewritten in * C by Kees J. Bot, 7 Feb 1994. This code was ported from Minix to * uClibc on June 28, 2001 by Manuel Novoa III, and then reshuffled to * be reentrant by Erik Andersen on June 28, 2001. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Library General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * 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 Library General Public License * for more details. * * You should have received a copy of the GNU Library General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Original copyright notice is retained at the end of this file. * */ /* This program gets as input the key and salt arguments of the crypt(3) * function as two null terminated strings. The crypt result is output as * one null terminated string. Input and output must be <= 1024 characters. * The exit code will be 1 on any error. * * If the key has the form '##name' then the key will be encrypted and the * result checked to be equal to the encrypted password in the shadow password * file. If equal than '##name' will be returned, otherwise exit code 2. * * Otherwise the key will be encrypted normally and the result returned. * * As a special case, anything matches a null encrypted password to allow * a no-password login. */ #include #include extern char * md5_crypt_r( const char *pw, const char *salt, struct crypt_data * data); static const struct ordering InitialTr = { { 58,50,42,34,26,18,10, 2,60,52,44,36,28,20,12, 4, 62,54,46,38,30,22,14, 6,64,56,48,40,32,24,16, 8, 57,49,41,33,25,17, 9, 1,59,51,43,35,27,19,11, 3, 61,53,45,37,29,21,13, 5,63,55,47,39,31,23,15, 7, } }; static const struct ordering FinalTr = { { 40, 8,48,16,56,24,64,32,39, 7,47,15,55,23,63,31, 38, 6,46,14,54,22,62,30,37, 5,45,13,53,21,61,29, 36, 4,44,12,52,20,60,28,35, 3,43,11,51,19,59,27, 34, 2,42,10,50,18,58,26,33, 1,41, 9,49,17,57,25, } }; static const struct ordering swap = { { 33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48, 49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16, 17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32, } }; static const struct ordering KeyTr1 = { { 57,49,41,33,25,17, 9, 1,58,50,42,34,26,18, 10, 2,59,51,43,35,27,19,11, 3,60,52,44,36, 63,55,47,39,31,23,15, 7,62,54,46,38,30,22, 14, 6,61,53,45,37,29,21,13, 5,28,20,12, 4, } }; static const struct ordering KeyTr2 = { { 14,17,11,24, 1, 5, 3,28,15, 6,21,10, 23,19,12, 4,26, 8,16, 7,27,20,13, 2, 41,52,31,37,47,55,30,40,51,45,33,48, 44,49,39,56,34,53,46,42,50,36,29,32, } }; static const struct ordering etr = { { 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9,10,11,12,13,12,13,14,15,16,17, 16,17,18,19,20,21,20,21,22,23,24,25, 24,25,26,27,28,29,28,29,30,31,32, 1, } }; static const struct ordering ptr = { { 16, 7,20,21,29,12,28,17, 1,15,23,26, 5,18,31,10, 2, 8,24,14,32,27, 3, 9,19,13,30, 6,22,11, 4,25, } }; static const unsigned char s_boxes[8][64] = { { 14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7, 0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8, 4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0, 15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13, }, { 15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10, 3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5, 0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15, 13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9, }, { 10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8, 13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1, 13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7, 1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12, }, { 7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15, 13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9, 10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4, 3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14, }, { 2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9, 14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6, 4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14, 11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3, }, { 12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11, 10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8, 9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6, 4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13, }, { 4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1, 13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6, 1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2, 6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12, }, { 13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7, 1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2, 7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8, 2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11, }, }; static const int rots[] = { 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1, }; static void transpose(struct block *data, const struct ordering *t, int n) { struct block x; x = *data; while (n-- > 0) { data->b_data[n] = x.b_data[t->o_data[n] - 1]; } } static void rotate(struct block *key) { unsigned char *p = key->b_data; unsigned char *ep = &(key->b_data[55]); int data0 = key->b_data[0], data28 = key->b_data[28]; while (p++ < ep) *(p-1) = *p; key->b_data[27] = data0; key->b_data[55] = data28; } static void f(int i, struct block *key, struct block *a, struct block *x, struct crypt_data *data) { struct block e, ikey, y; int k; unsigned char *p, *q, *r; e = *a; transpose(&e, data->EP, 48); for (k = rots[i]; k; k--) rotate(key); ikey = *key; transpose(&ikey, &KeyTr2, 48); p = &(y.b_data[48]); q = &(e.b_data[48]); r = &(ikey.b_data[48]); while (p > y.b_data) { *--p = *--q ^ *--r; } q = x->b_data; for (k = 0; k < 8; k++) { int xb, r; r = *p++ << 5; r += *p++ << 3; r += *p++ << 2; r += *p++ << 1; r += *p++; r += *p++ << 4; xb = s_boxes[k][r]; *q++ = (xb >> 3) & 1; *q++ = (xb>>2) & 1; *q++ = (xb>>1) & 1; *q++ = (xb & 1); } transpose(x, &ptr, 32); } void setkey_r(const char *k, struct crypt_data *data) { struct block *key = &(data->key); memcpy(key, k, (sizeof(struct block))); transpose(key, &KeyTr1, 56); } extern void encrypt_r(char *blck, int edflag, struct crypt_data *data) { struct block *key = &(data->key); struct block *p = (struct block *) blck; int i; transpose(p, &InitialTr, 64); for (i = 15; i>= 0; i--) { int j = edflag ? i : 15 - i; int k; struct block b, x; b = *p; for (k = 31; k >= 0; k--) { p->b_data[k] = b.b_data[k + 32]; } f(j, key, p, &x, data); for (k = 31; k >= 0; k--) { p->b_data[k+32] = b.b_data[k] ^ x.b_data[k]; } } transpose(p, &swap, 64); transpose(p, &FinalTr, 64); } extern char *crypt_r(const char *pw, const char *salt, struct crypt_data *data) { char pwb[66]; char *cp; static char result[16]; char *p = pwb; struct ordering new_etr; int i; /* First, check if we are supposed to be using the MD5 replacement * instead of DES... */ if (salt[0]=='$' && salt[1]=='1' && salt[2]=='$') return md5_crypt_r(pw, salt, data); data->EP = &etr; while (*pw && p < &pwb[64]) { int j = 7; while (j--) { *p++ = (*pw >> j) & 01; } pw++; *p++ = 0; } while (p < &pwb[64]) *p++ = 0; setkey_r(p = pwb, data); while (p < &pwb[66]) *p++ = 0; new_etr = etr; data->EP = &new_etr; if (salt[0] == 0 || salt[1] == 0) salt = "**"; for (i = 0; i < 2; i++) { char c = *salt++; int j; result[i] = c; if ( c > 'Z') c -= 6 + 7 + '.'; /* c was a lower case letter */ else if ( c > '9') c -= 7 + '.';/* c was upper case letter */ else c -= '.'; /* c was digit, '.' or '/'. */ /* now, 0 <= c <= 63 */ for (j = 0; j < 6; j++) { if ((c >> j) & 01) { int t = 6*i + j; int temp = new_etr.o_data[t]; new_etr.o_data[t] = new_etr.o_data[t+24]; new_etr.o_data[t+24] = temp; } } } if (result[1] == 0) result[1] = result[0]; for (i = 0; i < 25; i++) encrypt_r(pwb,0, data); data->EP = &etr; p = pwb; cp = result+2; while (p < &pwb[66]) { int c = 0; int j = 6; while (j--) { c <<= 1; c |= *p++; } c += '.'; /* becomes >= '.' */ if (c > '9') c += 7; /* not in [./0-9], becomes upper */ if (c > 'Z') c += 6; /* not in [A-Z], becomes lower */ *cp++ = c; } *cp = 0; return result; } /* * Copyright (c) 1987,1997, Prentice Hall * All rights reserved. * * Redistribution and use of the MINIX operating system 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 Prentice Hall nor the names of the software * authors or 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, AUTHORS, 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 PRENTICE HALL OR ANY AUTHORS 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. * */