diff options
Diffstat (limited to 'crypto/heimdal/lib/krb5/crypto.c')
| -rw-r--r-- | crypto/heimdal/lib/krb5/crypto.c | 2322 |
1 files changed, 0 insertions, 2322 deletions
diff --git a/crypto/heimdal/lib/krb5/crypto.c b/crypto/heimdal/lib/krb5/crypto.c deleted file mode 100644 index 08ebdba65fa67..0000000000000 --- a/crypto/heimdal/lib/krb5/crypto.c +++ /dev/null @@ -1,2322 +0,0 @@ -/* - * Copyright (c) 1997 - 2000 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. - */ - -#include "krb5_locl.h" -RCSID("$Id: crypto.c,v 1.29 2000/01/25 23:06:55 assar Exp $"); -/* RCSID("$FreeBSD$"); */ - -#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 */ - -struct salt_type { - krb5_salttype type; - const char *name; - krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data, - krb5_salt, 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, struct key_data*, void*, size_t, Checksum*); - krb5_error_code (*verify)(krb5_context, struct key_data*, - void*, size_t, Checksum*); -}; - -struct encryption_type { - krb5_enctype type; - const char *name; - size_t blocksize; - size_t confoundersize; - struct key_type *keytype; - struct checksum_type *cksumtype; - struct checksum_type *keyed_checksum; - unsigned flags; - void (*encrypt)(struct key_data *, void *, size_t, int); -}; - -#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 void -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 -DES_schedule(krb5_context context, - struct key_data *key) -{ - des_set_key(key->key->keyvalue.data, key->schedule->data); -} - -static krb5_error_code -DES_string_to_key(krb5_context context, - krb5_enctype enctype, - krb5_data password, - krb5_salt salt, - krb5_keyblock *key) -{ - char *s; - size_t len; - des_cblock tmp; - - len = password.length + salt.saltvalue.length + 1; - s = malloc(len); - if(s == NULL) - return ENOMEM; - memcpy(s, password.data, password.length); - memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length); - s[len - 1] = '\0'; - des_string_to_key(s, &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 -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) ? ((char*)cell.data)[i] : 0); - password[i] = c ? c : 'X'; - } - password[8] = '\0'; - - memcpy(key, crypt(password, "#~") + 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 -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)) - memcpy(password + pw.length, - cell.data, min(cell.length, - sizeof(password) - pw.length)); - 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_keyblock *key) -{ - des_cblock tmp; - if(password.length > 8) - DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp); - else - 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_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) - 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, (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, (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_keyblock *key) -{ - krb5_error_code ret; - size_t len = password.length + salt.saltvalue.length; - char *s; - - s = malloc(len); - if(len != 0 && s == NULL) - 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_keyblock *key) -{ - char *s, *p; - size_t len; - int i; - MD4_CTX m; - - len = 2 * (password.length + salt.saltvalue.length); - s = malloc (len); - if (len != 0 && s == NULL) - return ENOMEM; - for (p = s, i = 0; i < password.length; ++i) { - *p++ = ((char *)password.data)[i]; - *p++ = 0; - } - for (i = 0; i < salt.saltvalue.length; ++i) { - *p++ = ((char *)salt.saltvalue.data)[i]; - *p++ = 0; - } - MD4Init (&m); - MD4Update (&m, s, len); - key->keytype = enctype; - krb5_data_alloc (&key->keyvalue, 16); - MD4Final (key->keyvalue.data, &m); - memset (s, 0, len); - free (s); - return 0; -} - -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), - DES_random_key, - 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 -}; - -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, - &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", - 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 } -}; - -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) - 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) - return ENOMEM; - return 0; - } - } - 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) - 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; - } - } - 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) -{ - struct encryption_type *et =_find_enctype(enctype); - struct salt_type *st; - if(et == NULL) - return KRB5_PROG_ETYPE_NOSUPP; - for(st = et->keytype->string_to_key; st && st->type; st++) - if(st->type == salt.salttype) - return (*st->string_to_key)(context, enctype, password, salt, key); - return HEIM_ERR_SALTTYPE_NOSUPP; -} - -krb5_error_code -krb5_string_to_key_salt (krb5_context context, - krb5_enctype enctype, - const char *password, - krb5_salt salt, - krb5_keyblock *key) -{ - krb5_data pw; - pw.data = (void*)password; - pw.length = strlen(password); - return krb5_string_to_key_data_salt(context, enctype, pw, salt, key); -} - -krb5_error_code -krb5_keytype_to_string(krb5_context context, - krb5_keytype keytype, - char **string) -{ - struct key_type *kt = _find_keytype(keytype); - if(kt == NULL) - return KRB5_PROG_KEYTYPE_NOSUPP; - *string = strdup(kt->name); - if(*string == NULL) - return ENOMEM; - return 0; -} - -krb5_error_code -krb5_string_to_keytype(krb5_context context, - const char *string, - krb5_keytype *keytype) -{ - int i; - for(i = 0; i < num_keytypes; i++) - if(strcasecmp(keytypes[i]->name, string) == 0){ - *keytype = keytypes[i]->type; - return 0; - } - return KRB5_PROG_KEYTYPE_NOSUPP; -} - -krb5_error_code -krb5_generate_random_keyblock(krb5_context context, - krb5_enctype type, - krb5_keyblock *key) -{ - krb5_error_code ret; - struct encryption_type *et = _find_enctype(type); - if(et == NULL) - return KRB5_PROG_ETYPE_NOSUPP; - ret = krb5_data_alloc(&key->keyvalue, et->keytype->size); - if(ret) - return ret; - key->keytype = type; - if(et->keytype->random_key) - (*et->keytype->random_key)(context, key); - else - krb5_generate_random_block(key->keyvalue.data, - key->keyvalue.length); - return 0; -} - -static krb5_error_code -_key_schedule(krb5_context context, - struct key_data *key) -{ - krb5_error_code ret; - struct encryption_type *et = _find_enctype(key->key->keytype); - struct key_type *kt = et->keytype; - - if(kt->schedule == NULL) - return 0; - ALLOC(key->schedule, 1); - if(key->schedule == NULL) - return ENOMEM; - ret = krb5_data_alloc(key->schedule, kt->schedule_size); - if(ret) { - free(key->schedule); - key->schedule = NULL; - return ret; - } - (*kt->schedule)(context, key); - return 0; -} - -/************************************************************ - * * - ************************************************************/ - -static void -NONE_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ -} - -static void -CRC32_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - u_int32_t crc; - unsigned char *r = C->checksum.data; - _krb5_crc_init_table (); - crc = _krb5_crc_update (data, len, 0); - r[0] = crc & 0xff; - r[1] = (crc >> 8) & 0xff; - r[2] = (crc >> 16) & 0xff; - r[3] = (crc >> 24) & 0xff; -} - -static void -RSA_MD4_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - MD4_CTX m; - - MD4Init (&m); - MD4Update (&m, data, len); - MD4Final (C->checksum.data, &m); -} - -static void -RSA_MD4_DES_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *cksum) -{ - MD4_CTX md4; - des_cblock ivec; - unsigned char *p = cksum->checksum.data; - - krb5_generate_random_block(p, 8); - MD4Init (&md4); - MD4Update (&md4, p, 8); - MD4Update (&md4, data, len); - MD4Final (p + 8, &md4); - memset (&ivec, 0, sizeof(ivec)); - des_cbc_encrypt((const void *)p, - (void *)p, - 24, - key->schedule->data, - &ivec, - DES_ENCRYPT); -} - -static krb5_error_code -RSA_MD4_DES_verify(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - MD4_CTX md4; - unsigned char tmp[24]; - unsigned char res[16]; - des_cblock ivec; - krb5_error_code ret = 0; - - memset(&ivec, 0, sizeof(ivec)); - des_cbc_encrypt(C->checksum.data, - (void*)tmp, - C->checksum.length, - key->schedule->data, - &ivec, - DES_DECRYPT); - MD4Init (&md4); - MD4Update (&md4, tmp, 8); /* confounder */ - MD4Update (&md4, data, len); - MD4Final (res, &md4); - if(memcmp(res, tmp + 8, sizeof(res)) != 0) - ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; - memset(tmp, 0, sizeof(tmp)); - memset(res, 0, sizeof(res)); - return ret; -} - -static void -RSA_MD5_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - MD5_CTX m; - - MD5Init (&m); - MD5Update(&m, data, len); - MD5Final (C->checksum.data, &m); -} - -static void -RSA_MD5_DES_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - MD5_CTX md5; - des_cblock ivec; - unsigned char *p = C->checksum.data; - - krb5_generate_random_block(p, 8); - MD5Init (&md5); - MD5Update (&md5, p, 8); - MD5Update (&md5, data, len); - MD5Final (p + 8, &md5); - memset (&ivec, 0, sizeof(ivec)); - des_cbc_encrypt((const void *)p, - (void *)p, - 24, - key->schedule->data, - &ivec, - DES_ENCRYPT); -} - -static krb5_error_code -RSA_MD5_DES_verify(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - MD5_CTX md5; - unsigned char tmp[24]; - unsigned char res[16]; - des_cblock ivec; - des_key_schedule *sched = key->schedule->data; - krb5_error_code ret = 0; - - memset(&ivec, 0, sizeof(ivec)); - des_cbc_encrypt(C->checksum.data, - (void*)tmp, - C->checksum.length, - sched[0], - &ivec, - DES_DECRYPT); - MD5Init (&md5); - MD5Update (&md5, tmp, 8); /* confounder */ - MD5Update (&md5, data, len); - MD5Final (res, &md5); - if(memcmp(res, tmp + 8, sizeof(res)) != 0) - ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; - memset(tmp, 0, sizeof(tmp)); - memset(res, 0, sizeof(res)); - return ret; -} - -static void -RSA_MD5_DES3_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - MD5_CTX md5; - des_cblock ivec; - unsigned char *p = C->checksum.data; - des_key_schedule *sched = key->schedule->data; - - krb5_generate_random_block(p, 8); - MD5Init (&md5); - MD5Update (&md5, p, 8); - MD5Update (&md5, data, len); - MD5Final (p + 8, &md5); - memset (&ivec, 0, sizeof(ivec)); - des_ede3_cbc_encrypt((const void *)p, - (void *)p, - 24, - sched[0], sched[1], sched[2], - &ivec, - DES_ENCRYPT); -} - -static krb5_error_code -RSA_MD5_DES3_verify(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - MD5_CTX md5; - unsigned char tmp[24]; - unsigned char res[16]; - des_cblock ivec; - des_key_schedule *sched = key->schedule->data; - krb5_error_code ret = 0; - - memset(&ivec, 0, sizeof(ivec)); - des_ede3_cbc_encrypt(C->checksum.data, - (void*)tmp, - C->checksum.length, - sched[0], sched[1], sched[2], - &ivec, - DES_DECRYPT); - MD5Init (&md5); - MD5Update (&md5, tmp, 8); /* confounder */ - MD5Update (&md5, data, len); - MD5Final (res, &md5); - if(memcmp(res, tmp + 8, sizeof(res)) != 0) - ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; - memset(tmp, 0, sizeof(tmp)); - memset(res, 0, sizeof(res)); - return ret; -} - -static void -SHA1_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *C) -{ - SHA1_CTX m; - - SHA_Init(&m); - SHA_Update(&m, data, len); - SHA_Final(C->checksum.data, &m); -} - -/* HMAC according to RFC2104 */ -static void -hmac(krb5_context context, - struct checksum_type *cm, - void *data, - size_t len, - struct key_data *keyblock, - Checksum *result) -{ - unsigned char *ipad, *opad; - unsigned char *key; - size_t key_len; - int i; - - if(keyblock->key->keyvalue.length > cm->blocksize){ - (*cm->checksum)(context, - keyblock, - keyblock->key->keyvalue.data, - keyblock->key->keyvalue.length, - result); - key = result->checksum.data; - key_len = result->checksum.length; - } else { - key = keyblock->key->keyvalue.data; - key_len = keyblock->key->keyvalue.length; - } - ipad = malloc(cm->blocksize + len); - opad = malloc(cm->blocksize + cm->checksumsize); - memset(ipad, 0x36, cm->blocksize); - memset(opad, 0x5c, cm->blocksize); - for(i = 0; i < key_len; i++){ - ipad[i] ^= key[i]; - opad[i] ^= key[i]; - } - memcpy(ipad + cm->blocksize, data, len); - (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len, result); - memcpy(opad + cm->blocksize, result->checksum.data, - result->checksum.length); - (*cm->checksum)(context, keyblock, opad, - cm->blocksize + cm->checksumsize, result); - memset(ipad, 0, cm->blocksize + len); - free(ipad); - memset(opad, 0, cm->blocksize + cm->checksumsize); - free(opad); -} - -static void -HMAC_SHA1_DES3_checksum(krb5_context context, - struct key_data *key, - void *data, - size_t len, - Checksum *result) -{ - struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1); - - hmac(context, c, data, len, key, result); -} - -struct checksum_type checksum_none = { - CKSUMTYPE_NONE, - "none", - 1, - 0, - 0, - NONE_checksum, - NULL -}; -struct checksum_type checksum_crc32 = { - CKSUMTYPE_CRC32, - "crc32", - 1, - 4, - 0, - CRC32_checksum, - NULL -}; -struct checksum_type checksum_rsa_md4 = { - CKSUMTYPE_RSA_MD4, - "rsa-md4", - 64, - 16, - F_CPROOF, - RSA_MD4_checksum, - NULL -}; -struct checksum_type checksum_rsa_md4_des = { - CKSUMTYPE_RSA_MD4_DES, - "rsa-md4-des", - 64, - 24, - F_KEYED | F_CPROOF | F_VARIANT, - RSA_MD4_DES_checksum, - RSA_MD4_DES_verify -}; -#if 0 -struct checksum_type checksum_des_mac = { - CKSUMTYPE_DES_MAC, - "des-mac", - 0, - 0, - 0, - DES_MAC_checksum, -}; -struct checksum_type checksum_des_mac_k = { - CKSUMTYPE_DES_MAC_K, - "des-mac-k", - 0, - 0, - 0, - DES_MAC_K_checksum, -}; -struct checksum_type checksum_rsa_md4_des_k = { - CKSUMTYPE_RSA_MD4_DES_K, - "rsa-md4-des-k", - 0, - 0, - 0, - RSA_MD4_DES_K_checksum, - RSA_MD4_DES_K_verify, -}; -#endif -struct checksum_type checksum_rsa_md5 = { - CKSUMTYPE_RSA_MD5, - "rsa-md5", - 64, - 16, - F_CPROOF, - RSA_MD5_checksum, - NULL -}; -struct checksum_type checksum_rsa_md5_des = { - CKSUMTYPE_RSA_MD5_DES, - "rsa-md5-des", - 64, - 24, - F_KEYED | F_CPROOF | F_VARIANT, - RSA_MD5_DES_checksum, - RSA_MD5_DES_verify, -}; -struct checksum_type checksum_rsa_md5_des3 = { - CKSUMTYPE_RSA_MD5_DES3, - "rsa-md5-des3", - 64, - 24, - F_KEYED | F_CPROOF | F_VARIANT, - RSA_MD5_DES3_checksum, - RSA_MD5_DES3_verify, -}; -struct checksum_type checksum_sha1 = { - CKSUMTYPE_SHA1, - "sha1", - 64, - 20, - F_CPROOF, - SHA1_checksum, - NULL -}; -struct checksum_type checksum_hmac_sha1_des3 = { - CKSUMTYPE_HMAC_SHA1_DES3, - "hmac-sha1-des3", - 64, - 20, - F_KEYED | F_CPROOF | F_DERIVED, - HMAC_SHA1_DES3_checksum, - NULL -}; - -struct checksum_type *checksum_types[] = { - &checksum_none, - &checksum_crc32, - &checksum_rsa_md4, - &checksum_rsa_md4_des, -#if 0 - &checksum_des_mac, - &checksum_des_mac_k, - &checksum_rsa_md4_des_k, -#endif - &checksum_rsa_md5, - &checksum_rsa_md5_des, - &checksum_rsa_md5_des3, - &checksum_sha1, - &checksum_hmac_sha1_des3 -}; - -static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]); - -static struct checksum_type * -_find_checksum(krb5_cksumtype type) -{ - int i; - for(i = 0; i < num_checksums; i++) - if(checksum_types[i]->type == type) - return checksum_types[i]; - return NULL; -} - -static krb5_error_code -get_checksum_key(krb5_context context, - krb5_crypto crypto, - unsigned usage, /* not krb5_key_usage */ - struct checksum_type *ct, - struct key_data **key) -{ - krb5_error_code ret = 0; - - if(ct->flags & F_DERIVED) - ret = _get_derived_key(context, crypto, usage, key); - else if(ct->flags & F_VARIANT) { - int i; - - *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */); - if(*key == NULL) - return ENOMEM; - ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key); - if(ret) - return ret; - for(i = 0; i < (*key)->key->keyvalue.length; i++) - ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0; - } else { - *key = &crypto->key; - } - if(ret == 0) - ret = _key_schedule(context, *key); - return ret; -} - -static krb5_error_code -do_checksum (krb5_context context, - struct checksum_type *ct, - krb5_crypto crypto, - unsigned usage, - void *data, - size_t len, - Checksum *result) -{ - krb5_error_code ret; - struct key_data *dkey; - int keyed_checksum; - - keyed_checksum = (ct->flags & F_KEYED) != 0; - if(keyed_checksum && crypto == NULL) - return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */ - if(keyed_checksum) - ret = get_checksum_key(context, crypto, usage, ct, &dkey); - else - dkey = NULL; - result->cksumtype = ct->type; - krb5_data_alloc(&result->checksum, ct->checksumsize); - (*ct->checksum)(context, dkey, data, len, result); - return 0; -} - -static krb5_error_code -create_checksum(krb5_context context, - krb5_crypto crypto, - unsigned usage, /* not krb5_key_usage */ - krb5_cksumtype type, /* if crypto == NULL */ - void *data, - size_t len, - Checksum *result) -{ - struct checksum_type *ct; - - if(crypto) { - ct = crypto->et->keyed_checksum; - if(ct == NULL) - ct = crypto->et->cksumtype; - } else - ct = _find_checksum(type); - if(ct == NULL) - return KRB5_PROG_SUMTYPE_NOSUPP; - return do_checksum (context, ct, crypto, usage, data, len, result); -} - -krb5_error_code -krb5_create_checksum(krb5_context context, - krb5_crypto crypto, - unsigned usage_or_type, - void *data, - size_t len, - Checksum *result) -{ - return create_checksum(context, crypto, - CHECKSUM_USAGE(usage_or_type), - usage_or_type, data, len, result); -} - -static krb5_error_code -verify_checksum(krb5_context context, - krb5_crypto crypto, - unsigned usage, /* not krb5_key_usage */ - void *data, - size_t len, - Checksum *cksum) -{ - krb5_error_code ret; - struct key_data *dkey; - int keyed_checksum; - Checksum c; - struct checksum_type *ct; - - ct = _find_checksum(cksum->cksumtype); - if(ct == NULL) - return KRB5_PROG_SUMTYPE_NOSUPP; - if(ct->checksumsize != cksum->checksum.length) - return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */ - keyed_checksum = (ct->flags & F_KEYED) != 0; - if(keyed_checksum && crypto == NULL) - return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */ - if(keyed_checksum) - ret = get_checksum_key(context, crypto, usage, ct, &dkey); - else - dkey = NULL; - if(ct->verify) - return (*ct->verify)(context, dkey, data, len, cksum); - - ret = krb5_data_alloc (&c.checksum, ct->checksumsize); - if (ret) - return ret; - - (*ct->checksum)(context, dkey, data, len, &c); - - if(c.checksum.length != cksum->checksum.length || - memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) - ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; - else - ret = 0; - krb5_data_free (&c.checksum); - return ret; -} - -krb5_error_code -krb5_verify_checksum(krb5_context context, - krb5_crypto crypto, - krb5_key_usage usage, - void *data, - size_t len, - Checksum *cksum) -{ - return verify_checksum(context, crypto, - CHECKSUM_USAGE(usage), data, len, cksum); -} - -krb5_error_code -krb5_checksumsize(krb5_context context, - krb5_cksumtype type, - size_t *size) -{ - struct checksum_type *ct = _find_checksum(type); - if(ct == NULL) - return KRB5_PROG_SUMTYPE_NOSUPP; - *size = ct->checksumsize; - return 0; -} - -krb5_boolean -krb5_checksum_is_keyed(krb5_context context, - krb5_cksumtype type) -{ - struct checksum_type *ct = _find_checksum(type); - if(ct == NULL) - return KRB5_PROG_SUMTYPE_NOSUPP; - return ct->flags & F_KEYED; -} - -krb5_boolean -krb5_checksum_is_collision_proof(krb5_context context, - krb5_cksumtype type) -{ - struct checksum_type *ct = _find_checksum(type); - if(ct == NULL) - return KRB5_PROG_SUMTYPE_NOSUPP; - return ct->flags & F_CPROOF; -} - -/************************************************************ - * * - ************************************************************/ - -static void -NULL_encrypt(struct key_data *key, - void *data, - size_t len, - krb5_boolean encrypt) -{ -} - -static void -DES_CBC_encrypt_null_ivec(struct key_data *key, - void *data, - size_t len, - krb5_boolean encrypt) -{ - des_cblock ivec; - des_key_schedule *s = key->schedule->data; - memset(&ivec, 0, sizeof(ivec)); - des_cbc_encrypt(data, data, len, *s, &ivec, encrypt); -} - -static void -DES_CBC_encrypt_key_ivec(struct key_data *key, - void *data, - size_t len, - krb5_boolean encrypt) -{ - des_cblock ivec; - des_key_schedule *s = key->schedule->data; - memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec)); - des_cbc_encrypt(data, data, len, *s, &ivec, encrypt); -} - -static void -DES3_CBC_encrypt(struct key_data *key, - void *data, - size_t len, - krb5_boolean encrypt) -{ - des_cblock ivec; - des_key_schedule *s = key->schedule->data; - memset(&ivec, 0, sizeof(ivec)); - des_ede3_cbc_encrypt(data, data, len, s[0], s[1], s[2], &ivec, encrypt); -} - -static void -ARCFOUR_encrypt(struct key_data *key, - void *data, - size_t len, - krb5_boolean encrypt) -{ - -} - -/* - * these should currently be in reverse preference order. - */ - -static struct encryption_type etypes[] = { - { - ETYPE_NULL, - "null", - 1, - 0, - &keytype_null, - &checksum_none, - NULL, - 0, - NULL_encrypt, - }, - { - ETYPE_DES_CBC_CRC, - "des-cbc-crc", - 8, - 8, - &keytype_des, - &checksum_crc32, - NULL, - 0, - DES_CBC_encrypt_key_ivec, - }, - { - ETYPE_DES_CBC_MD4, - "des-cbc-md4", - 8, - 8, - &keytype_des, - &checksum_rsa_md4, - &checksum_rsa_md4_des, - 0, - DES_CBC_encrypt_null_ivec, - }, - { - ETYPE_DES_CBC_MD5, - "des-cbc-md5", - 8, - 8, - &keytype_des, - &checksum_rsa_md5, - &checksum_rsa_md5_des, - 0, - DES_CBC_encrypt_null_ivec, - }, - { - ETYPE_DES3_CBC_MD5, - "des3-cbc-md5", - 8, - 8, - &keytype_des3, - &checksum_rsa_md5, - &checksum_rsa_md5_des3, - 0, - DES3_CBC_encrypt, - }, - { - ETYPE_DES3_CBC_SHA1, - "des3-cbc-sha1", - 8, - 8, - &keytype_des3_derived, - &checksum_sha1, - &checksum_hmac_sha1_des3, - F_DERIVED, - DES3_CBC_encrypt, - }, - { - ETYPE_OLD_DES3_CBC_SHA1, - "old-des3-cbc-sha1", - 8, - 8, - &keytype_des3, - &checksum_sha1, - &checksum_hmac_sha1_des3, - 0, - DES3_CBC_encrypt, - }, - { - ETYPE_DES_CBC_NONE, - "des-cbc-none", - 8, - 0, - &keytype_des, - &checksum_none, - NULL, - F_PSEUDO, - DES_CBC_encrypt_null_ivec, - }, - { - ETYPE_DES3_CBC_NONE, - "des3-cbc-none", - 8, - 0, - &keytype_des3_derived, - &checksum_none, - NULL, - F_PSEUDO, - DES_CBC_encrypt_null_ivec, - }, -}; - -static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]); - - -static struct encryption_type * -_find_enctype(krb5_enctype type) -{ - int i; - for(i = 0; i < num_etypes; i++) - if(etypes[i].type == type) - return &etypes[i]; - return NULL; -} - - -krb5_error_code -krb5_enctype_to_string(krb5_context context, - krb5_enctype etype, - char **string) -{ - struct encryption_type *e; - e = _find_enctype(etype); - if(e == NULL) - return KRB5_PROG_ETYPE_NOSUPP; - *string = strdup(e->name); - if(*string == NULL) - return ENOMEM; - return 0; -} - -krb5_error_code -krb5_string_to_enctype(krb5_context context, - const char *string, - krb5_enctype *etype) -{ - int i; - for(i = 0; i < num_etypes; i++) - if(strcasecmp(etypes[i].name, string) == 0){ - *etype = etypes[i].type; - return 0; - } - return KRB5_PROG_ETYPE_NOSUPP; -} - -krb5_error_code -krb5_enctype_to_keytype(krb5_context context, - krb5_enctype etype, - krb5_keytype *keytype) -{ - struct encryption_type *e = _find_enctype(etype); - if(e == NULL) - return KRB5_PROG_ETYPE_NOSUPP; - *keytype = e->keytype->type; /* XXX */ - return 0; -} - -#if 0 -krb5_error_code -krb5_keytype_to_enctype(krb5_context context, - krb5_keytype keytype, - krb5_enctype *etype) -{ - struct key_type *kt = _find_keytype(keytype); - krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype); - if(kt == NULL) - return KRB5_PROG_KEYTYPE_NOSUPP; - *etype = kt->best_etype; - return 0; -} -#endif - -krb5_error_code -krb5_keytype_to_enctypes (krb5_context context, - krb5_keytype keytype, - unsigned *len, - int **val) -{ - int i; - unsigned n = 0; - int *ret; - - for (i = num_etypes - 1; i >= 0; --i) { - if (etypes[i].keytype->type == keytype - && !(etypes[i].flags & F_PSEUDO)) - ++n; - } - ret = malloc(n * sizeof(int)); - if (ret == NULL && n != 0) - return ENOMEM; - n = 0; - for (i = num_etypes - 1; i >= 0; --i) { - if (etypes[i].keytype->type == keytype - && !(etypes[i].flags & F_PSEUDO)) - ret[n++] = etypes[i].type; - } - *len = n; - *val = ret; - return 0; -} - -/* - * First take the configured list of etypes for `keytype' if available, - * else, do `krb5_keytype_to_enctypes'. - */ - -krb5_error_code -krb5_keytype_to_enctypes_default (krb5_context context, - krb5_keytype keytype, - unsigned *len, - int **val) -{ - int i, n; - int *ret; - - if (keytype != KEYTYPE_DES || context->etypes_des == NULL) - return krb5_keytype_to_enctypes (context, keytype, len, val); - - for (n = 0; context->etypes_des[n]; ++n) - ; - ret = malloc (n * sizeof(*ret)); - if (ret == NULL && n != 0) - return ENOMEM; - for (i = 0; i < n; ++i) - ret[i] = context->etypes_des[i]; - *len = n; - *val = ret; - return 0; -} - -krb5_error_code -krb5_enctype_valid(krb5_context context, - krb5_enctype etype) -{ - return _find_enctype(etype) != NULL; -} - -/* if two enctypes have compatible keys */ -krb5_boolean -krb5_enctypes_compatible_keys(krb5_context context, - krb5_enctype etype1, - krb5_enctype etype2) -{ - struct encryption_type *e1 = _find_enctype(etype1); - struct encryption_type *e2 = _find_enctype(etype2); - return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype; -} - -static krb5_boolean -derived_crypto(krb5_context context, - krb5_crypto crypto) -{ - return (crypto->et->flags & F_DERIVED) != 0; -} - - -#define CHECKSUMSIZE(C) ((C)->checksumsize) -#define CHECKSUMTYPE(C) ((C)->type) - -static krb5_error_code -encrypt_internal_derived(krb5_context context, - krb5_crypto crypto, - unsigned usage, - void *data, - size_t len, - krb5_data *result) -{ - size_t sz, block_sz, checksum_sz; - Checksum cksum; - unsigned char *p, *q; - krb5_error_code ret; - struct key_data *dkey; - struct encryption_type *et = crypto->et; - - checksum_sz = CHECKSUMSIZE(et->keyed_checksum); - - sz = et->confoundersize + /* 4 - length */ len; - block_sz = (sz + et->blocksize - 1) &~ (et->blocksize - 1); /* pad */ - p = calloc(1, block_sz + checksum_sz); - if(p == NULL) - return ENOMEM; - - q = p; - krb5_generate_random_block(q, et->confoundersize); /* XXX */ - q += et->confoundersize; - memcpy(q, data, len); - - ret = create_checksum(context, - crypto, - INTEGRITY_USAGE(usage), - 0, - p, - block_sz, - &cksum); - if(ret == 0 && cksum.checksum.length != checksum_sz) - ret = KRB5_CRYPTO_INTERNAL; - if(ret) { - memset(p, 0, block_sz + checksum_sz); - free(p); - return ret; - } - memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length); - ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey); - if(ret) { - memset(p, 0, block_sz + checksum_sz); - free(p); - return ret; - } - ret = _key_schedule(context, dkey); - if(ret) { - memset(p, 0, block_sz); - free(p); - return ret; - } -#ifdef CRYPTO_DEBUG - krb5_crypto_debug(context, 1, block_sz, dkey->key); -#endif - (*et->encrypt)(dkey, p, block_sz, 1); - result->data = p; - result->length = block_sz + checksum_sz; - return 0; -} - -static krb5_error_code -encrypt_internal(krb5_context context, - krb5_crypto crypto, - void *data, - size_t len, - krb5_data *result) -{ - size_t sz, block_sz, checksum_sz; - Checksum cksum; - unsigned char *p, *q; - krb5_error_code ret; - struct encryption_type *et = crypto->et; - - checksum_sz = CHECKSUMSIZE(et->cksumtype); - - sz = et->confoundersize + checksum_sz + len; - block_sz = (sz + et->blocksize - 1) &~ (et->blocksize - 1); /* pad */ - p = calloc(1, block_sz); - if(p == NULL) - return ENOMEM; - - q = p; - krb5_generate_random_block(q, et->confoundersize); /* XXX */ - q += et->confoundersize; - memset(q, 0, checksum_sz); - q += checksum_sz; - memcpy(q, data, len); - - ret = create_checksum(context, - NULL, - 0, - CHECKSUMTYPE(et->cksumtype), - p, - block_sz, - &cksum); - if(ret == 0 && cksum.checksum.length != checksum_sz) { - free_Checksum (&cksum); - ret = KRB5_CRYPTO_INTERNAL; - } - if(ret) { - memset(p, 0, block_sz); - free(p); - free_Checksum(&cksum); - return ret; - } - memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length); - free_Checksum(&cksum); - ret = _key_schedule(context, &crypto->key); - if(ret) { - memset(p, 0, block_sz); - free(p); - return ret; - } -#ifdef CRYPTO_DEBUG - krb5_crypto_debug(context, 1, block_sz, crypto->key.key); -#endif - (*et->encrypt)(&crypto->key, p, block_sz, 1); - result->data = p; - result->length = block_sz; - return 0; -} - -static krb5_error_code -decrypt_internal_derived(krb5_context context, - krb5_crypto crypto, - unsigned usage, - void *data, - size_t len, - krb5_data *result) -{ - size_t checksum_sz; - Checksum cksum; - unsigned char *p; - krb5_error_code ret; - struct key_data *dkey; - struct encryption_type *et = crypto->et; - unsigned long l; - - p = malloc(len); - if(len != 0 && p == NULL) - return ENOMEM; - memcpy(p, data, len); - - checksum_sz = CHECKSUMSIZE(et->keyed_checksum); - len -= checksum_sz; - - ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey); - if(ret) { - free(p); - return ret; - } - ret = _key_schedule(context, dkey); - if(ret) { - free(p); - return ret; - } -#ifdef CRYPTO_DEBUG - krb5_crypto_debug(context, 0, len, dkey->key); -#endif - (*et->encrypt)(dkey, p, len, 0); - - cksum.checksum.data = p + len; - cksum.checksum.length = checksum_sz; - cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum); - - ret = verify_checksum(context, - crypto, - INTEGRITY_USAGE(usage), - p, - len, - &cksum); - if(ret) { - free(p); - return ret; - } - l = len - et->confoundersize; - memmove(p, p + et->confoundersize, l); - result->data = realloc(p, l); - if(p == NULL) { - free(p); - return ENOMEM; - } - result->length = l; - return 0; -} - -static krb5_error_code -decrypt_internal(krb5_context context, - krb5_crypto crypto, - void *data, - size_t len, - krb5_data *result) -{ - krb5_error_code ret; - unsigned char *p; - Checksum cksum; - size_t checksum_sz, l; - struct encryption_type *et = crypto->et; - - checksum_sz = CHECKSUMSIZE(et->cksumtype); - p = malloc(len); - if(len != 0 && p == NULL) - return ENOMEM; - memcpy(p, data, len); - - ret = _key_schedule(context, &crypto->key); - if(ret) { - free(p); - return ret; - } -#ifdef CRYPTO_DEBUG - krb5_crypto_debug(context, 0, len, crypto->key.key); -#endif - (*et->encrypt)(&crypto->key, p, len, 0); - ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz); - if(ret) { - free(p); - return ret; - } - memset(p + et->confoundersize, 0, checksum_sz); - cksum.cksumtype = CHECKSUMTYPE(et->cksumtype); - ret = verify_checksum(context, NULL, 0, p, len, &cksum); - free_Checksum(&cksum); - if(ret) { - free(p); - return ret; - } - l = len - et->confoundersize - checksum_sz; - memmove(p, p + et->confoundersize + checksum_sz, l); - result->data = realloc(p, l); - if(result->data == NULL) { - free(p); - return ENOMEM; - } - result->length = l; - return 0; -} - -krb5_error_code -krb5_encrypt(krb5_context context, - krb5_crypto crypto, - unsigned usage, - void *data, - size_t len, - krb5_data *result) -{ - if(derived_crypto(context, crypto)) - return encrypt_internal_derived(context, crypto, usage, - data, len, result); - else - return encrypt_internal(context, crypto, data, len, result); -} - -krb5_error_code -krb5_encrypt_EncryptedData(krb5_context context, - krb5_crypto crypto, - unsigned usage, - void *data, - size_t len, - int kvno, - EncryptedData *result) -{ - result->etype = CRYPTO_ETYPE(crypto); - if(kvno){ - ALLOC(result->kvno, 1); - *result->kvno = kvno; - }else - result->kvno = NULL; - return krb5_encrypt(context, crypto, usage, data, len, &result->cipher); -} - -krb5_error_code -krb5_decrypt(krb5_context context, - krb5_crypto crypto, - unsigned usage, - void *data, - size_t len, - krb5_data *result) -{ - if(derived_crypto(context, crypto)) - return decrypt_internal_derived(context, crypto, usage, - data, len, result); - else - return decrypt_internal(context, crypto, data, len, result); -} - -krb5_error_code -krb5_decrypt_EncryptedData(krb5_context context, - krb5_crypto crypto, - unsigned usage, - EncryptedData *e, - krb5_data *result) -{ - return krb5_decrypt(context, crypto, usage, - e->cipher.data, e->cipher.length, result); -} - -/************************************************************ - * * - ************************************************************/ - -void -krb5_generate_random_block(void *buf, size_t len) -{ - des_cblock key, out; - static des_cblock counter; - static des_key_schedule schedule; - int i; - static int initialized = 0; - - if(!initialized) { - des_new_random_key(&key); - des_set_key(&key, schedule); - memset(&key, 0, sizeof(key)); - des_new_random_key(&counter); - } - while(len > 0) { - des_ecb_encrypt(&counter, &out, schedule, DES_ENCRYPT); - for(i = 7; i >=0; i--) - if(counter[i]++) - break; - memcpy(buf, out, min(len, sizeof(out))); - len -= min(len, sizeof(out)); - buf = (char*)buf + sizeof(out); - } -} - -static void -DES3_postproc(krb5_context context, - unsigned char *k, size_t len, struct key_data *key) -{ - unsigned char x[24]; - int i, j; - - memset(x, 0, sizeof(x)); - for (i = 0; i < 3; ++i) { - unsigned char foo; - - for (j = 0; j < 7; ++j) { - unsigned char b = k[7 * i + j]; - - x[8 * i + j] = b; - } - foo = 0; - for (j = 6; j >= 0; --j) { - foo |= k[7 * i + j] & 1; - foo <<= 1; - } - x[8 * i + 7] = foo; - } - k = key->key->keyvalue.data; - memcpy(k, x, 24); - memset(x, 0, sizeof(x)); - if (key->schedule) { - krb5_free_data(context, key->schedule); - key->schedule = NULL; - } - des_set_odd_parity((des_cblock*)k); - des_set_odd_parity((des_cblock*)(k + 8)); - des_set_odd_parity((des_cblock*)(k + 16)); -} - -static krb5_error_code -derive_key(krb5_context context, - struct encryption_type *et, - struct key_data *key, - void *constant, - size_t len) -{ - unsigned char *k; - unsigned int nblocks = 0, i; - krb5_error_code ret = 0; - - struct key_type *kt = et->keytype; - ret = _key_schedule(context, key); - if(ret) - return ret; - if(et->blocksize * 8 < kt->bits || - len != et->blocksize) { - nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8); - k = malloc(nblocks * et->blocksize); - if(k == NULL) - return ENOMEM; - _krb5_n_fold(constant, len, k, et->blocksize); - for(i = 0; i < nblocks; i++) { - if(i > 0) - memcpy(k + i * et->blocksize, - k + (i - 1) * et->blocksize, - et->blocksize); - (*et->encrypt)(key, k + i * et->blocksize, et->blocksize, 1); - } - } else { - void *c = malloc(len); - size_t res_len = (kt->bits + 7) / 8; - - if(len != 0 && c == NULL) - return ENOMEM; - memcpy(c, constant, len); - (*et->encrypt)(key, c, len, 1); - k = malloc(res_len); - if(res_len != 0 && k == NULL) - return ENOMEM; - _krb5_n_fold(c, len, k, res_len); - free(c); - } - - /* XXX keytype dependent post-processing */ - switch(kt->type) { - case KEYTYPE_DES3: - DES3_postproc(context, k, nblocks * et->blocksize, key); - break; - default: - krb5_warnx(context, "derive_key() called with unknown keytype (%u)", - kt->type); - ret = KRB5_CRYPTO_INTERNAL; - break; - } - memset(k, 0, nblocks * et->blocksize); - free(k); - return ret; -} - -static struct key_data * -_new_derived_key(krb5_crypto crypto, unsigned usage) -{ - struct key_usage *d = crypto->key_usage; - d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d)); - if(d == NULL) - return NULL; - crypto->key_usage = d; - d += crypto->num_key_usage++; - memset(d, 0, sizeof(*d)); - d->usage = usage; - return &d->key; -} - -static krb5_error_code -_get_derived_key(krb5_context context, - krb5_crypto crypto, - unsigned usage, - struct key_data **key) -{ - int i; - struct key_data *d; - unsigned char constant[5]; - - for(i = 0; i < crypto->num_key_usage; i++) - if(crypto->key_usage[i].usage == usage) { - *key = &crypto->key_usage[i].key; - return 0; - } - d = _new_derived_key(crypto, usage); - if(d == NULL) - return ENOMEM; - krb5_copy_keyblock(context, crypto->key.key, &d->key); - _krb5_put_int(constant, usage, 5); - derive_key(context, crypto->et, d, constant, sizeof(constant)); - *key = d; - return 0; -} - - -krb5_error_code -krb5_crypto_init(krb5_context context, - krb5_keyblock *key, - krb5_enctype etype, - krb5_crypto *crypto) -{ - krb5_error_code ret; - ALLOC(*crypto, 1); - if(*crypto == NULL) - return ENOMEM; - if(etype == ETYPE_NULL) - etype = key->keytype; - (*crypto)->et = _find_enctype(etype); - if((*crypto)->et == NULL) { - free(*crypto); - return KRB5_PROG_ETYPE_NOSUPP; - } - ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key); - if(ret) { - free(*crypto); - return ret; - } - (*crypto)->key.schedule = NULL; - (*crypto)->num_key_usage = 0; - (*crypto)->key_usage = NULL; - return 0; -} - -static void -free_key_data(krb5_context context, struct key_data *key) -{ - krb5_free_keyblock(context, key->key); - if(key->schedule) { - memset(key->schedule->data, 0, key->schedule->length); - krb5_free_data(context, key->schedule); - } -} - -static void -free_key_usage(krb5_context context, struct key_usage *ku) -{ - free_key_data(context, &ku->key); -} - -krb5_error_code -krb5_crypto_destroy(krb5_context context, - krb5_crypto crypto) -{ - int i; - - for(i = 0; i < crypto->num_key_usage; i++) - free_key_usage(context, &crypto->key_usage[i]); - free(crypto->key_usage); - free_key_data(context, &crypto->key); - free (crypto); - return 0; -} - -krb5_error_code -krb5_string_to_key_derived(krb5_context context, - const void *str, - size_t len, - krb5_enctype etype, - krb5_keyblock *key) -{ - struct encryption_type *et = _find_enctype(etype); - krb5_error_code ret; - struct key_data kd; - u_char *tmp; - - if(et == NULL) - return KRB5_PROG_ETYPE_NOSUPP; - ALLOC(kd.key, 1); - kd.key->keytype = etype; - tmp = malloc (et->keytype->bits / 8); - _krb5_n_fold(str, len, tmp, et->keytype->bits / 8); - krb5_data_alloc(&kd.key->keyvalue, et->keytype->size); - kd.schedule = NULL; - DES3_postproc (context, tmp, et->keytype->bits / 8, &kd); /* XXX */ - ret = derive_key(context, - et, - &kd, - "kerberos", /* XXX well known constant */ - strlen("kerberos")); - ret = krb5_copy_keyblock_contents(context, kd.key, key); - free_key_data(context, &kd); - return ret; -} - -/* - * Return the size of an encrypted packet of length `data_len' - */ - -size_t -krb5_get_wrapped_length (krb5_context context, - krb5_crypto crypto, - size_t data_len) -{ - struct encryption_type *et = crypto->et; - size_t blocksize = et->blocksize; - size_t res; - - res = (data_len + blocksize - 1) / blocksize * blocksize; - res = res + et->confoundersize + et->cksumtype->checksumsize; - return res; -} - -#ifdef CRYPTO_DEBUG - -static krb5_error_code -krb5_get_keyid(krb5_context context, - krb5_keyblock *key, - u_int32_t *keyid) -{ - MD5_CTX md5; - unsigned char tmp[16]; - - MD5Init (&md5); - MD5Update (&md5, key->keyvalue.data, key->keyvalue.length); - MD5Final (tmp, &md5); - *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15]; - return 0; -} - -static void -krb5_crypto_debug(krb5_context context, - int encrypt, - size_t len, - krb5_keyblock *key) -{ - u_int32_t keyid; - char *kt; - krb5_get_keyid(context, key, &keyid); - krb5_enctype_to_string(context, key->keytype, &kt); - krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)", - encrypt ? "encrypting" : "decrypting", - (unsigned long)len, - keyid, - kt); - free(kt); -} - -#endif /* CRYPTO_DEBUG */ |