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crypto.c
3779 lines (3405 loc) · 88 KB
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crypto.c
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/*
* Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 THE INSTITUTE 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.
*/
#define OPENSSL_DISABLE_OLD_DES_SUPPORT 1
#include "krb5_locl.h"
__RCSID("$Heimdal: crypto.c,v 1.73.2.4 2004/03/06 16:38:00 lha Exp $"
"$NetBSD: crypto.c,v 1.13.12.1 2008/09/15 08:09:55 skrll Exp $");
#undef CRYPTO_DEBUG
#ifdef CRYPTO_DEBUG
static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*);
#endif
struct key_data {
krb5_keyblock *key;
krb5_data *schedule;
};
struct key_usage {
unsigned usage;
struct key_data key;
};
struct krb5_crypto_data {
struct encryption_type *et;
struct key_data key;
int num_key_usage;
struct key_usage *key_usage;
};
#define CRYPTO_ETYPE(C) ((C)->et->type)
/* bits for `flags' below */
#define F_KEYED 1 /* checksum is keyed */
#define F_CPROOF 2 /* checksum is collision proof */
#define F_DERIVED 4 /* uses derived keys */
#define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
#define F_PSEUDO 16 /* not a real protocol type */
#define F_SPECIAL 32 /* backwards */
struct salt_type {
krb5_salttype type;
const char *name;
krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
krb5_salt, krb5_data, krb5_keyblock*);
};
struct key_type {
krb5_keytype type; /* XXX */
const char *name;
size_t bits;
size_t size;
size_t schedule_size;
#if 0
krb5_enctype best_etype;
#endif
void (*random_key)(krb5_context, krb5_keyblock*);
void (*schedule)(krb5_context, struct key_data *);
struct salt_type *string_to_key;
};
struct checksum_type {
krb5_cksumtype type;
const char *name;
size_t blocksize;
size_t checksumsize;
unsigned flags;
void (*checksum)(krb5_context context,
struct key_data *key,
const void *buf, size_t len,
unsigned usage,
Checksum *csum);
krb5_error_code (*verify)(krb5_context context,
struct key_data *key,
const void *buf, size_t len,
unsigned usage,
Checksum *csum);
};
struct encryption_type {
krb5_enctype type;
const char *name;
size_t blocksize;
size_t padsize;
size_t confoundersize;
struct key_type *keytype;
struct checksum_type *checksum;
struct checksum_type *keyed_checksum;
unsigned flags;
krb5_error_code (*encrypt)(krb5_context context,
struct key_data *key,
void *data, size_t len,
krb5_boolean encrypt,
int usage,
void *ivec);
};
#define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
#define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
#define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
static struct checksum_type *_find_checksum(krb5_cksumtype type);
static struct encryption_type *_find_enctype(krb5_enctype type);
static struct key_type *_find_keytype(krb5_keytype type);
static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
unsigned, struct key_data**);
static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
static krb5_error_code derive_key(krb5_context context,
struct encryption_type *et,
struct key_data *key,
const void *constant,
size_t len);
static krb5_error_code hmac(krb5_context context,
struct checksum_type *cm,
const void *data,
size_t len,
unsigned usage,
struct key_data *keyblock,
Checksum *result);
static void free_key_data(krb5_context context, struct key_data *key);
static krb5_error_code usage2arcfour (krb5_context, int *);
/************************************************************
* *
************************************************************/
static void
krb5_DES_random_key(krb5_context context,
krb5_keyblock *key)
{
DES_cblock *k = key->keyvalue.data;
do {
krb5_generate_random_block(k, sizeof(DES_cblock));
DES_set_odd_parity(k);
} while(DES_is_weak_key(k));
}
static void
krb5_DES_schedule(krb5_context context,
struct key_data *key)
{
DES_set_key(key->key->keyvalue.data, key->schedule->data);
}
static void
DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key)
{
DES_key_schedule schedule;
int i;
int reverse = 0;
unsigned char *p;
unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
memset(key, 0, 8);
p = (unsigned char*)key;
for (i = 0; i < length; i++) {
unsigned char tmp = data[i];
if (!reverse)
*p++ ^= (tmp << 1);
else
*--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
if((i % 8) == 7)
reverse = !reverse;
}
DES_set_odd_parity(key);
if(DES_is_weak_key(key))
(*key)[7] ^= 0xF0;
DES_set_key(key, &schedule);
DES_cbc_cksum((void*)data, key, length, &schedule, key);
memset(&schedule, 0, sizeof(schedule));
DES_set_odd_parity(key);
}
static krb5_error_code
krb5_DES_string_to_key(krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_salt salt,
krb5_data opaque,
krb5_keyblock *key)
{
unsigned char *s;
size_t len;
DES_cblock tmp;
len = password.length + salt.saltvalue.length;
s = malloc(len);
if(len > 0 && s == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
memcpy(s, password.data, password.length);
memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
DES_string_to_key_int(s, len, &tmp);
key->keytype = enctype;
krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
memset(&tmp, 0, sizeof(tmp));
memset(s, 0, len);
free(s);
return 0;
}
/* This defines the Andrew string_to_key function. It accepts a password
* string as input and converts its via a one-way encryption algorithm to a DES
* encryption key. It is compatible with the original Andrew authentication
* service password database.
*/
/*
* Short passwords, i.e 8 characters or less.
*/
static void
krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
krb5_data cell,
DES_cblock *key)
{
char password[8+1]; /* crypt is limited to 8 chars anyway */
int i;
for(i = 0; i < 8; i++) {
char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
((i < cell.length) ?
tolower(((unsigned char*)cell.data)[i]) : 0);
password[i] = c ? c : 'X';
}
password[8] = '\0';
memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock));
/* parity is inserted into the LSB so left shift each byte up one
bit. This allows ascii characters with a zero MSB to retain as
much significance as possible. */
for (i = 0; i < sizeof(DES_cblock); i++)
((unsigned char*)key)[i] <<= 1;
DES_set_odd_parity (key);
}
/*
* Long passwords, i.e 9 characters or more.
*/
static void
krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
krb5_data cell,
DES_cblock *key)
{
DES_key_schedule schedule;
DES_cblock temp_key;
DES_cblock ivec;
char password[512];
size_t passlen;
memcpy(password, pw.data, min(pw.length, sizeof(password)));
if(pw.length < sizeof(password)) {
int len = min(cell.length, sizeof(password) - pw.length);
int i;
memcpy(password + pw.length, cell.data, len);
for (i = pw.length; i < pw.length + len; ++i)
password[i] = tolower((unsigned char)password[i]);
}
passlen = min(sizeof(password), pw.length + cell.length);
memcpy(&ivec, "kerberos", 8);
memcpy(&temp_key, "kerberos", 8);
DES_set_odd_parity (&temp_key);
DES_set_key (&temp_key, &schedule);
DES_cbc_cksum ((const void *)password, &ivec, passlen, &schedule, &ivec);
memcpy(&temp_key, &ivec, 8);
DES_set_odd_parity (&temp_key);
DES_set_key (&temp_key, &schedule);
DES_cbc_cksum ((const void *)password, key, passlen, &schedule, &ivec);
memset(&schedule, 0, sizeof(schedule));
memset(&temp_key, 0, sizeof(temp_key));
memset(&ivec, 0, sizeof(ivec));
memset(password, 0, sizeof(password));
DES_set_odd_parity (key);
}
static krb5_error_code
DES_AFS3_string_to_key(krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_salt salt,
krb5_data opaque,
krb5_keyblock *key)
{
DES_cblock tmp;
if(password.length > 8)
krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
else
krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
key->keytype = enctype;
krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
memset(&key, 0, sizeof(key));
return 0;
}
static void
DES3_random_key(krb5_context context,
krb5_keyblock *key)
{
DES_cblock *k = key->keyvalue.data;
do {
krb5_generate_random_block(k, 3 * sizeof(DES_cblock));
DES_set_odd_parity(&k[0]);
DES_set_odd_parity(&k[1]);
DES_set_odd_parity(&k[2]);
} while(DES_is_weak_key(&k[0]) ||
DES_is_weak_key(&k[1]) ||
DES_is_weak_key(&k[2]));
}
static void
DES3_schedule(krb5_context context,
struct key_data *key)
{
DES_cblock *k = key->key->keyvalue.data;
DES_key_schedule *s = key->schedule->data;
DES_set_key(&k[0], &s[0]);
DES_set_key(&k[1], &s[1]);
DES_set_key(&k[2], &s[2]);
}
/*
* A = A xor B. A & B are 8 bytes.
*/
static void
xor (DES_cblock *key, const unsigned char *b)
{
unsigned char *a = (unsigned char*)key;
a[0] ^= b[0];
a[1] ^= b[1];
a[2] ^= b[2];
a[3] ^= b[3];
a[4] ^= b[4];
a[5] ^= b[5];
a[6] ^= b[6];
a[7] ^= b[7];
}
static krb5_error_code
DES3_string_to_key(krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_salt salt,
krb5_data opaque,
krb5_keyblock *key)
{
char *str;
size_t len;
unsigned char tmp[24];
DES_cblock keys[3];
len = password.length + salt.saltvalue.length;
str = malloc(len);
if(len != 0 && str == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
memcpy(str, password.data, password.length);
memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
{
DES_cblock ivec;
DES_key_schedule s[3];
int i;
_krb5_n_fold(str, len, tmp, 24);
for(i = 0; i < 3; i++){
memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
DES_set_odd_parity(keys + i);
if(DES_is_weak_key(keys + i))
xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
DES_set_key(keys + i, &s[i]);
}
memset(&ivec, 0, sizeof(ivec));
DES_ede3_cbc_encrypt((const void *)tmp,
(void *)tmp, sizeof(tmp),
&s[0], &s[1], &s[2], &ivec, DES_ENCRYPT);
memset(s, 0, sizeof(s));
memset(&ivec, 0, sizeof(ivec));
for(i = 0; i < 3; i++){
memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
DES_set_odd_parity(keys + i);
if(DES_is_weak_key(keys + i))
xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
}
memset(tmp, 0, sizeof(tmp));
}
key->keytype = enctype;
krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
memset(keys, 0, sizeof(keys));
memset(str, 0, len);
free(str);
return 0;
}
static krb5_error_code
DES3_string_to_key_derived(krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_salt salt,
krb5_data opaque,
krb5_keyblock *key)
{
krb5_error_code ret;
size_t len = password.length + salt.saltvalue.length;
char *s;
s = malloc(len);
if(len != 0 && s == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
memcpy(s, password.data, password.length);
memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
ret = krb5_string_to_key_derived(context,
s,
len,
enctype,
key);
memset(s, 0, len);
free(s);
return ret;
}
/*
* ARCFOUR
*/
static void
ARCFOUR_random_key(krb5_context context, krb5_keyblock *key)
{
krb5_generate_random_block (key->keyvalue.data,
key->keyvalue.length);
}
static void
ARCFOUR_schedule(krb5_context context, struct key_data *kd)
{
RC4_set_key (kd->schedule->data,
kd->key->keyvalue.length, kd->key->keyvalue.data);
}
static krb5_error_code
ARCFOUR_string_to_key(krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_salt salt,
krb5_data opaque,
krb5_keyblock *key)
{
char *s, *p;
size_t len;
int i;
MD4_CTX m;
len = 2 * password.length;
s = malloc (len);
if (len != 0 && s == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
for (p = s, i = 0; i < password.length; ++i) {
*p++ = ((char *)password.data)[i];
*p++ = 0;
}
MD4_Init (&m);
MD4_Update (&m, s, len);
key->keytype = enctype;
krb5_data_alloc (&key->keyvalue, 16);
MD4_Final (key->keyvalue.data, &m);
memset (s, 0, len);
free (s);
return 0;
}
#ifdef ENABLE_AES
/*
* AES
*/
/* iter is really 1 based, so iter == 0 will be 1 iteration */
krb5_error_code
krb5_PKCS5_PBKDF2(krb5_context context, krb5_cksumtype cktype,
krb5_data password, krb5_salt salt, u_int32_t iter,
krb5_keytype type, krb5_keyblock *key)
{
struct checksum_type *c = _find_checksum(cktype);
struct key_type *kt;
size_t datalen, leftofkey;
krb5_error_code ret;
u_int32_t keypart;
struct key_data ksign;
krb5_keyblock kb;
Checksum result;
char *data, *tmpcksum;
int i, j;
char *p;
if (c == NULL) {
krb5_set_error_string(context, "checksum %d not supported", cktype);
return KRB5_PROG_KEYTYPE_NOSUPP;
}
kt = _find_keytype(type);
if (kt == NULL) {
krb5_set_error_string(context, "key type %d not supported", type);
return KRB5_PROG_KEYTYPE_NOSUPP;
}
key->keytype = type;
ret = krb5_data_alloc (&key->keyvalue, kt->bits / 8);
if (ret) {
krb5_set_error_string(context, "malloc: out of memory");
return ret;
}
ret = krb5_data_alloc (&result.checksum, c->checksumsize);
if (ret) {
krb5_set_error_string(context, "malloc: out of memory");
krb5_data_free (&key->keyvalue);
return ret;
}
tmpcksum = malloc(c->checksumsize);
if (tmpcksum == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
krb5_data_free (&key->keyvalue);
krb5_data_free (&result.checksum);
return ENOMEM;
}
datalen = salt.saltvalue.length + 4;
data = malloc(datalen);
if (data == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
free(tmpcksum);
krb5_data_free (&key->keyvalue);
krb5_data_free (&result.checksum);
return ENOMEM;
}
kb.keyvalue = password;
ksign.key = &kb;
memcpy(data, salt.saltvalue.data, salt.saltvalue.length);
keypart = 1;
leftofkey = key->keyvalue.length;
p = key->keyvalue.data;
while (leftofkey) {
int len;
if (leftofkey > c->checksumsize)
len = c->checksumsize;
else
len = leftofkey;
_krb5_put_int(data + datalen - 4, keypart, 4);
ret = hmac(context, c, data, datalen, 0, &ksign, &result);
if (ret)
krb5_abortx(context, "hmac failed");
memcpy(p, result.checksum.data, len);
memcpy(tmpcksum, result.checksum.data, result.checksum.length);
for (i = 0; i < iter; i++) {
ret = hmac(context, c, tmpcksum, result.checksum.length,
0, &ksign, &result);
if (ret)
krb5_abortx(context, "hmac failed");
memcpy(tmpcksum, result.checksum.data, result.checksum.length);
for (j = 0; j < len; j++)
p[j] ^= tmpcksum[j];
}
p += len;
leftofkey -= len;
keypart++;
}
free(data);
free(tmpcksum);
krb5_data_free (&result.checksum);
return 0;
}
static krb5_error_code
AES_string_to_key(krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_salt salt,
krb5_data opaque,
krb5_keyblock *key)
{
krb5_error_code ret;
u_int32_t iter;
struct encryption_type *et;
struct key_data kd;
if (opaque.length == 0)
iter = 45056 - 1;
else if (opaque.length == 4) {
unsigned long v;
_krb5_get_int(opaque.data, &v, 4);
iter = ((u_int32_t)v) - 1;
} else
return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
et = _find_enctype(enctype);
if (et == NULL)
return KRB5_PROG_KEYTYPE_NOSUPP;
ret = krb5_PKCS5_PBKDF2(context, CKSUMTYPE_SHA1, password, salt,
iter, enctype, key);
if (ret)
return ret;
ret = krb5_copy_keyblock(context, key, &kd.key);
kd.schedule = NULL;
ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
if (ret) {
krb5_data_free(&key->keyvalue);
} else {
ret = krb5_copy_keyblock_contents(context, kd.key, key);
free_key_data(context, &kd);
}
return ret;
}
static void
AES_schedule(krb5_context context, struct key_data *kd)
{
AES_KEY *key = kd->schedule->data;
int bits = kd->key->keyvalue.length * 8;
AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key[0]);
AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key[1]);
}
/*
*
*/
extern struct salt_type AES_salt[];
#endif /* ENABLE_AES */
extern struct salt_type des_salt[],
des3_salt[], des3_salt_derived[], arcfour_salt[];
struct key_type keytype_null = {
KEYTYPE_NULL,
"null",
0,
0,
0,
NULL,
NULL,
NULL
};
struct key_type keytype_des = {
KEYTYPE_DES,
"des",
56,
sizeof(DES_cblock),
sizeof(DES_key_schedule),
krb5_DES_random_key,
krb5_DES_schedule,
des_salt
};
struct key_type keytype_des3 = {
KEYTYPE_DES3,
"des3",
168,
3 * sizeof(DES_cblock),
3 * sizeof(DES_key_schedule),
DES3_random_key,
DES3_schedule,
des3_salt
};
struct key_type keytype_des3_derived = {
KEYTYPE_DES3,
"des3",
168,
3 * sizeof(DES_cblock),
3 * sizeof(DES_key_schedule),
DES3_random_key,
DES3_schedule,
des3_salt_derived
};
#ifdef ENABLE_AES
struct key_type keytype_aes128 = {
KEYTYPE_AES128,
"aes-128",
128,
16,
sizeof(AES_KEY) * 2,
NULL,
AES_schedule,
AES_salt
};
struct key_type keytype_aes256 = {
KEYTYPE_AES256,
"aes-256",
256,
16,
sizeof(AES_KEY) * 2,
NULL,
AES_schedule,
AES_salt
};
#endif /* ENABLE_AES */
struct key_type keytype_arcfour = {
KEYTYPE_ARCFOUR,
"arcfour",
128,
16,
sizeof(RC4_KEY),
ARCFOUR_random_key,
ARCFOUR_schedule,
arcfour_salt
};
struct key_type *keytypes[] = {
&keytype_null,
&keytype_des,
&keytype_des3_derived,
&keytype_des3,
#ifdef ENABLE_AES
&keytype_aes128,
&keytype_aes256,
#endif /* ENABLE_AES */
&keytype_arcfour
};
static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
static struct key_type *
_find_keytype(krb5_keytype type)
{
int i;
for(i = 0; i < num_keytypes; i++)
if(keytypes[i]->type == type)
return keytypes[i];
return NULL;
}
struct salt_type des_salt[] = {
{
KRB5_PW_SALT,
"pw-salt",
krb5_DES_string_to_key
},
{
KRB5_AFS3_SALT,
"afs3-salt",
DES_AFS3_string_to_key
},
{ 0 }
};
struct salt_type des3_salt[] = {
{
KRB5_PW_SALT,
"pw-salt",
DES3_string_to_key
},
{ 0 }
};
struct salt_type des3_salt_derived[] = {
{
KRB5_PW_SALT,
"pw-salt",
DES3_string_to_key_derived
},
{ 0 }
};
#ifdef ENABLE_AES
struct salt_type AES_salt[] = {
{
KRB5_PW_SALT,
"pw-salt",
AES_string_to_key
},
{ 0 }
};
#endif /* ENABLE_AES */
struct salt_type arcfour_salt[] = {
{
KRB5_PW_SALT,
"pw-salt",
ARCFOUR_string_to_key
},
{ 0 }
};
krb5_error_code
krb5_salttype_to_string (krb5_context context,
krb5_enctype etype,
krb5_salttype stype,
char **string)
{
struct encryption_type *e;
struct salt_type *st;
e = _find_enctype (etype);
if (e == NULL) {
krb5_set_error_string(context, "encryption type %d not supported",
etype);
return KRB5_PROG_ETYPE_NOSUPP;
}
for (st = e->keytype->string_to_key; st && st->type; st++) {
if (st->type == stype) {
*string = strdup (st->name);
if (*string == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
return 0;
}
}
krb5_set_error_string(context, "salttype %d not supported", stype);
return HEIM_ERR_SALTTYPE_NOSUPP;
}
krb5_error_code
krb5_string_to_salttype (krb5_context context,
krb5_enctype etype,
const char *string,
krb5_salttype *salttype)
{
struct encryption_type *e;
struct salt_type *st;
e = _find_enctype (etype);
if (e == NULL) {
krb5_set_error_string(context, "encryption type %d not supported",
etype);
return KRB5_PROG_ETYPE_NOSUPP;
}
for (st = e->keytype->string_to_key; st && st->type; st++) {
if (strcasecmp (st->name, string) == 0) {
*salttype = st->type;
return 0;
}
}
krb5_set_error_string(context, "salttype %s not supported", string);
return HEIM_ERR_SALTTYPE_NOSUPP;
}
krb5_error_code
krb5_get_pw_salt(krb5_context context,
krb5_const_principal principal,
krb5_salt *salt)
{
size_t len;
int i;
krb5_error_code ret;
char *p;
salt->salttype = KRB5_PW_SALT;
len = strlen(principal->realm);
for (i = 0; i < principal->name.name_string.len; ++i)
len += strlen(principal->name.name_string.val[i]);
ret = krb5_data_alloc (&salt->saltvalue, len);
if (ret)
return ret;
p = salt->saltvalue.data;
memcpy (p, principal->realm, strlen(principal->realm));
p += strlen(principal->realm);
for (i = 0; i < principal->name.name_string.len; ++i) {
memcpy (p,
principal->name.name_string.val[i],
strlen(principal->name.name_string.val[i]));
p += strlen(principal->name.name_string.val[i]);
}
return 0;
}
krb5_error_code
krb5_free_salt(krb5_context context,
krb5_salt salt)
{
krb5_data_free(&salt.saltvalue);
return 0;
}
krb5_error_code
krb5_string_to_key_data (krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_principal principal,
krb5_keyblock *key)
{
krb5_error_code ret;
krb5_salt salt;
ret = krb5_get_pw_salt(context, principal, &salt);
if(ret)
return ret;
ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
krb5_free_salt(context, salt);
return ret;
}
krb5_error_code
krb5_string_to_key (krb5_context context,
krb5_enctype enctype,
const char *password,
krb5_principal principal,
krb5_keyblock *key)
{
krb5_data pw;
pw.data = (void*)password;
pw.length = strlen(password);
return krb5_string_to_key_data(context, enctype, pw, principal, key);
}
krb5_error_code
krb5_string_to_key_data_salt (krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_salt salt,
krb5_keyblock *key)
{
krb5_data opaque;
krb5_data_zero(&opaque);
return krb5_string_to_key_data_salt_opaque(context, enctype, password,
salt, opaque, key);
}
/*
* Do a string -> key for encryption type `enctype' operation on
* `password' (with salt `salt' and the enctype specific data string
* `opaque'), returning the resulting key in `key'
*/
krb5_error_code
krb5_string_to_key_data_salt_opaque (krb5_context context,
krb5_enctype enctype,
krb5_data password,
krb5_salt salt,
krb5_data opaque,
krb5_keyblock *key)
{
struct encryption_type *et =_find_enctype(enctype);