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|
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* RFC 3961 and AFS string to key. These are not standard crypto primitives
* (RFC 3961 string-to-key is implemented in OpenSSL for historical reasons but
* it doesn't get weak keys right), so we have to implement them here.
*/
#include <ctype.h>
#include "crypto_int.h"
#undef min
#define min(a,b) ((a)>(b)?(b):(a))
/* Compute a CBC checksum of in (with length len) using the specified key and
* ivec. The result is written into out. */
static krb5_error_code
des_cbc_mac(const unsigned char *keybits, const unsigned char *ivec,
const unsigned char *in, size_t len, unsigned char *out)
{
krb5_error_code ret;
krb5_keyblock kb;
krb5_key key;
krb5_crypto_iov iov[2];
unsigned char zero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
krb5_data outd, ivecd;
/* Make a key from keybits. */
kb.magic = KV5M_KEYBLOCK;
kb.enctype = ENCTYPE_DES_CBC_CRC;
kb.length = 8;
kb.contents = (unsigned char *)keybits;
ret = krb5_k_create_key(NULL, &kb, &key);
if (ret)
return ret;
/* Make iovs for the input data, padding it out to the block size. */
iov[0].flags = KRB5_CRYPTO_TYPE_DATA;
iov[0].data = make_data((unsigned char *)in, len);
iov[1].flags = KRB5_CRYPTO_TYPE_DATA;
iov[1].data = make_data(zero, krb5_roundup(len, 8) - len);
/* Make krb5_data structures for the ivec and output. */
ivecd = make_data((unsigned char *)ivec, 8);
outd = make_data(out, 8);
/* Call the cbc_mac operation of the module's DES enc-provider. */
ret = krb5int_enc_des.cbc_mac(key, iov, 2, &ivecd, &outd);
krb5_k_free_key(NULL, key);
return ret;
}
/*** AFS string-to-key constants ***/
/* Initial permutation */
static const char IP[] = {
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,
};
/* Final permutation, FP = IP^(-1) */
static const char FP[] = {
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,
};
/*
* Permuted-choice 1 from the key bits to yield C and D.
* Note that bits 8,16... are left out: They are intended for a parity check.
*/
static const char PC1_C[] = {
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,
};
static const char PC1_D[] = {
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,
};
/* Sequence of shifts used for the key schedule */
static const char shifts[] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,
};
/* Permuted-choice 2, to pick out the bits from the CD array that generate the
* key schedule */
static const char PC2_C[] = {
14,17,11,24, 1, 5,
3,28,15, 6,21,10,
23,19,12, 4,26, 8,
16, 7,27,20,13, 2,
};
static const char PC2_D[] = {
41,52,31,37,47,55,
30,40,51,45,33,48,
44,49,39,56,34,53,
46,42,50,36,29,32,
};
/* The E bit-selection table */
static const char e[] = {
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,
};
/* P is a permutation on the selected combination of the current L and key. */
static const char P[] = {
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,
};
/*
* The 8 selection functions.
* For some reason, they give a 0-origin
* index, unlike everything else.
*/
static const char S[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},
};
/* Set up the key schedule from the key. */
static void
afs_crypt_setkey(char *key, char *E, char (*KS)[48])
{
int i, j, k, t;
char C[28], D[28]; /* Used to calculate key schedule. */
/*
* First, generate C and D by permuting
* the key. The low order bit of each
* 8-bit char is not used, so C and D are only 28
* bits apiece.
*/
for (i = 0; i < 28; i++) {
C[i] = key[PC1_C[i] - 1];
D[i] = key[PC1_D[i] - 1];
}
/*
* To generate Ki, rotate C and D according
* to schedule and pick up a permutation
* using PC2.
*/
for (i = 0; i < 16; i++) {
/* Rotate. */
for (k = 0; k < shifts[i]; k++) {
t = C[0];
for (j = 0; j < 28 - 1; j++)
C[j] = C[j + 1];
C[27] = t;
t = D[0];
for (j = 0; j < 28 - 1; j++)
D[j] = D[j + 1];
D[27] = t;
}
/* Get Ki. Note C and D are concatenated. */
for (j = 0; j < 24; j++) {
KS[i][j] = C[PC2_C[j]-1];
KS[i][j+24] = D[PC2_D[j]-28-1];
}
}
memcpy(E, e, 48);
}
/*
* The payoff: encrypt a block.
*/
static void
afs_encrypt_block(char *block, char *E, char (*KS)[48])
{
const long edflag = 0;
int i, ii;
int t, j, k;
char tempL[32];
char f[32];
char L[64]; /* Current block divided into two halves */
char *const R = &L[32];
/* The combination of the key and the input, before selection. */
char preS[48];
/* First, permute the bits in the input. */
for (j = 0; j < 64; j++)
L[j] = block[IP[j] - 1];
/* Perform an encryption operation 16 times. */
for (ii = 0; ii < 16; ii++) {
/* Set direction. */
i = (edflag) ? 15 - ii : ii;
/* Save the R array, which will be the new L. */
memcpy(tempL, R, 32);
/* Expand R to 48 bits using the E selector; exclusive-or with the
* current key bits. */
for (j = 0; j < 48; j++)
preS[j] = R[E[j] - 1] ^ KS[i][j];
/*
* The pre-select bits are now considered in 8 groups of 6 bits each.
* The 8 selection functions map these 6-bit quantities into 4-bit
* quantities and the results permuted to make an f(R, K). The
* indexing into the selection functions is peculiar; it could be
* simplified by rewriting the tables.
*/
for (j = 0; j < 8; j++) {
t = 6 * j;
k = S[j][(preS[t + 0] << 5) +
(preS[t + 1] << 3) +
(preS[t + 2] << 2) +
(preS[t + 3] << 1) +
(preS[t + 4] << 0) +
(preS[t + 5] << 4)];
t = 4 * j;
f[t + 0] = (k >> 3) & 1;
f[t + 1] = (k >> 2) & 1;
f[t + 2] = (k >> 1) & 1;
f[t + 3] = (k >> 0) & 1;
}
/* The new R is L ^ f(R, K). The f here has to be permuted first,
* though. */
for (j = 0; j < 32; j++)
R[j] = L[j] ^ f[P[j] - 1];
/* Finally, the new L (the original R) is copied back. */
memcpy(L, tempL, 32);
}
/* The output L and R are reversed. */
for (j = 0; j < 32; j++) {
t = L[j];
L[j] = R[j];
R[j] = t;
}
/* The final output gets the inverse permutation of the very original. */
for (j = 0; j < 64; j++)
block[j] = L[FP[j] - 1];
}
/* iobuf must be at least 16 bytes */
static char *
afs_crypt(const char *pw, const char *salt, char *iobuf)
{
int i, j, c;
int temp;
char block[66];
char E[48];
char KS[16][48]; /* Key schedule, generated from key */
for (i = 0; i < 66; i++)
block[i] = 0;
for (i = 0; (c = *pw) != '\0' && i < 64; pw++){
for(j = 0; j < 7; j++, i++)
block[i] = (c >> (6 - j)) & 01;
i++;
}
afs_crypt_setkey(block, E, KS);
for (i = 0; i < 66; i++)
block[i] = 0;
for (i = 0; i < 2; i++) {
c = *salt++;
iobuf[i] = c;
if (c > 'Z')
c -= 6;
if (c > '9')
c -= 7;
c -= '.';
for (j = 0; j < 6; j++) {
if ((c >> j) & 01) {
temp = E[6 * i + j];
E[6 * i + j] = E[6 * i + j + 24];
E[6 * i + j + 24] = temp;
}
}
}
for (i = 0; i < 25; i++)
afs_encrypt_block(block, E, KS);
for (i = 0; i < 11; i++) {
c = 0;
for (j = 0; j < 6; j++) {
c <<= 1;
c |= block[6 * i + j];
}
c += '.';
if (c > '9')
c += 7;
if (c > 'Z')
c += 6;
iobuf[i + 2] = c;
}
iobuf[i + 2] = 0;
if (iobuf[1] == 0)
iobuf[1] = iobuf[0];
return iobuf;
}
static krb5_error_code
afs_s2k_oneblock(const krb5_data *data, const krb5_data *salt,
unsigned char *key_out)
{
unsigned int i;
unsigned char password[9]; /* trailing nul for crypt() */
char afs_crypt_buf[16];
/*
* Run afs_crypt and use the first eight returned bytes after the copy of
* the (fixed) salt.
*
* Since the returned bytes are alphanumeric, the output is limited to
* 2**48 possibilities; for each byte, only 64 possible values can be used.
*/
memset(password, 0, sizeof(password));
if (salt->length > 0)
memcpy(password, salt->data, min(salt->length, 8));
for (i = 0; i < 8; i++) {
if (isupper(password[i]))
password[i] = tolower(password[i]);
}
for (i = 0; i < data->length; i++)
password[i] ^= data->data[i];
for (i = 0; i < 8; i++) {
if (password[i] == '\0')
password[i] = 'X';
}
password[8] = '\0';
/* Out-of-bounds salt characters are equivalent to a salt string
* of "p1". */
strncpy((char *)key_out,
(char *)afs_crypt((char *)password, "#~", afs_crypt_buf) + 2, 8);
for (i = 0; i < 8; i++)
key_out[i] <<= 1;
/* Fix up key parity again. */
k5_des_fixup_key_parity(key_out);
zap(password, sizeof(password));
return 0;
}
static krb5_error_code
afs_s2k_multiblock(const krb5_data *data, const krb5_data *salt,
unsigned char *key_out)
{
krb5_error_code ret;
unsigned char ivec[8], tkey[8], *password;
size_t pw_len = salt->length + data->length;
unsigned int i, j;
/* Do a CBC checksum, twice, and use the result as the new key. */
password = malloc(pw_len);
if (!password)
return ENOMEM;
if (data->length > 0)
memcpy(password, data->data, data->length);
for (i = data->length, j = 0; j < salt->length; i++, j++) {
password[i] = salt->data[j];
if (isupper(password[i]))
password[i] = tolower(password[i]);
}
memcpy(ivec, "kerberos", sizeof(ivec));
memcpy(tkey, ivec, sizeof(tkey));
k5_des_fixup_key_parity(tkey);
ret = des_cbc_mac(tkey, ivec, password, pw_len, tkey);
if (ret)
goto cleanup;
memcpy(ivec, tkey, sizeof(ivec));
k5_des_fixup_key_parity(tkey);
ret = des_cbc_mac(tkey, ivec, password, pw_len, key_out);
if (ret)
goto cleanup;
k5_des_fixup_key_parity(key_out);
cleanup:
zapfree(password, pw_len);
return ret;
}
static krb5_error_code
afs_s2k(const krb5_data *data, const krb5_data *salt, unsigned char *key_out)
{
if (data->length <= 8)
return afs_s2k_oneblock(data, salt, key_out);
else
return afs_s2k_multiblock(data, salt, key_out);
}
static krb5_error_code
des_s2k(const krb5_data *pw, const krb5_data *salt, unsigned char *key_out)
{
union {
/* 8 "forward" bytes, 8 "reverse" bytes */
unsigned char uc[16];
krb5_ui_4 ui[4];
} temp;
unsigned int i;
krb5_ui_4 x, y, z;
unsigned char *p, *copy;
size_t copylen;
krb5_error_code ret;
/* As long as the architecture is big-endian or little-endian, it
doesn't matter which it is. Think of it as reversing the
bytes, and also reversing the bits within each byte. But this
current algorithm is dependent on having four 8-bit char values
exactly overlay a 32-bit integral type. */
if (sizeof(temp.uc) != sizeof(temp.ui)
|| (unsigned char)~0 != 0xFF
|| (krb5_ui_4)~(krb5_ui_4)0 != 0xFFFFFFFF
|| (temp.uc[0] = 1, temp.uc[1] = 2, temp.uc[2] = 3, temp.uc[3] = 4,
!(temp.ui[0] == 0x01020304
|| temp.ui[0] == 0x04030201)))
abort();
#define FETCH4(VAR, IDX) VAR = temp.ui[IDX/4]
#define PUT4(VAR, IDX) temp.ui[IDX/4] = VAR
copylen = pw->length + (salt ? salt->length : 0);
/* Don't need NUL termination, at this point we're treating it as
a byte array, not a string. */
copy = malloc(copylen);
if (copy == NULL)
return ENOMEM;
if (pw->length > 0)
memcpy(copy, pw->data, pw->length);
if (salt != NULL && salt->length > 0)
memcpy(copy + pw->length, salt->data, salt->length);
memset(&temp, 0, sizeof(temp));
p = temp.uc;
/* Handle the fan-fold xor operation by splitting the data into
forward and reverse sections, and combine them later, rather
than having to do the reversal over and over again. */
for (i = 0; i < copylen; i++) {
*p++ ^= copy[i];
if (p == temp.uc+16) {
p = temp.uc;
#ifdef PRINT_TEST_VECTORS
{
int j;
printf("after %d input bytes:\nforward block:\t", i+1);
for (j = 0; j < 8; j++)
printf(" %02x", temp.uc[j] & 0xff);
printf("\nreverse block:\t");
for (j = 8; j < 16; j++)
printf(" %02x", temp.uc[j] & 0xff);
printf("\n");
}
#endif
}
}
#ifdef PRINT_TEST_VECTORS
if (p != temp.uc) {
int j;
printf("at end, after %d input bytes:\nforward block:\t", i);
for (j = 0; j < 8; j++)
printf(" %02x", temp.uc[j] & 0xff);
printf("\nreverse block:\t");
for (j = 8; j < 16; j++)
printf(" %02x", temp.uc[j] & 0xff);
printf("\n");
}
#endif
#define REVERSE(VAR) \
{ \
krb5_ui_4 old = VAR, temp1 = 0; \
int j; \
for (j = 0; j < 32; j++) { \
temp1 = (temp1 << 1) | (old & 1); \
old >>= 1; \
} \
VAR = temp1; \
}
FETCH4 (x, 8);
FETCH4 (y, 12);
/* Ignore high bits of each input byte. */
x &= 0x7F7F7F7F;
y &= 0x7F7F7F7F;
/* Reverse the bit strings -- after this, y is "before" x. */
REVERSE (x);
REVERSE (y);
#ifdef PRINT_TEST_VECTORS
{
int j;
union { unsigned char uc[4]; krb5_ui_4 ui; } t2;
printf("after reversal, reversed block:\n\t\t");
t2.ui = y;
for (j = 0; j < 4; j++)
printf(" %02x", t2.uc[j] & 0xff);
t2.ui = x;
for (j = 0; j < 4; j++)
printf(" %02x", t2.uc[j] & 0xff);
printf("\n");
}
#endif
/* Ignored bits are now at the bottom of each byte, where we'll
* put the parity bits. Good. */
FETCH4 (z, 0);
z &= 0x7F7F7F7F;
/* Ignored bits for z are at the top of each byte; fix that. */
z <<= 1;
/* Finish the fan-fold xor for these four bytes. */
z ^= y;
PUT4 (z, 0);
/* Now do the second four bytes. */
FETCH4 (z, 4);
z &= 0x7F7F7F7F;
/* Ignored bits for z are at the top of each byte; fix that. */
z <<= 1;
/* Finish the fan-fold xor for these four bytes. */
z ^= x;
PUT4 (z, 4);
#ifdef PRINT_TEST_VECTORS
{
int j;
printf("after reversal, combined block:\n\t\t");
for (j = 0; j < 8; j++)
printf(" %02x", temp.uc[j] & 0xff);
printf("\n");
}
#endif
#define FIXUP(k) (k5_des_fixup_key_parity(k), \
k5_des_is_weak_key(k) ? (k[7] ^= 0xF0) : 0)
/* Now temp.cb is the temporary key, with invalid parity. */
FIXUP(temp.uc);
#ifdef PRINT_TEST_VECTORS
{
int j;
printf("after fixing parity and weak keys:\n\t\t");
for (j = 0; j < 8; j++)
printf(" %02x", temp.uc[j] & 0xff);
printf("\n");
}
#endif
ret = des_cbc_mac(temp.uc, temp.uc, copy, copylen, temp.uc);
if (ret)
goto cleanup;
#ifdef PRINT_TEST_VECTORS
{
int j;
printf("cbc checksum:\n\t\t");
for (j = 0; j < 8; j++)
printf(" %02x", temp.uc[j] & 0xff);
printf("\n");
}
#endif
FIXUP(temp.uc);
#ifdef PRINT_TEST_VECTORS
{
int j;
printf("after fixing parity and weak keys:\n\t\t");
for (j = 0; j < 8; j++)
printf(" %02x", temp.uc[j] & 0xff);
printf("\n");
}
#endif
memcpy(key_out, temp.uc, 8);
cleanup:
zap(&temp, sizeof(temp));
zapfree(copy, copylen);
return ret;
}
krb5_error_code
krb5int_des_string_to_key(const struct krb5_keytypes *ktp,
const krb5_data *string, const krb5_data *salt,
const krb5_data *parm, krb5_keyblock *keyblock)
{
int type;
if (parm != NULL) {
if (parm->length != 1)
return KRB5_ERR_BAD_S2K_PARAMS;
type = parm->data[0];
if (type != 0 && type != 1)
return KRB5_ERR_BAD_S2K_PARAMS;
} else
type = 0;
/* Use AFS string to key if we were told to. */
if (type == 1)
return afs_s2k(string, salt, keyblock->contents);
return des_s2k(string, salt, keyblock->contents);
}
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