diff options
Diffstat (limited to 'crypto/heimdal/lib/krb5/crypto.c')
| -rw-r--r-- | crypto/heimdal/lib/krb5/crypto.c | 4192 |
1 files changed, 0 insertions, 4192 deletions
diff --git a/crypto/heimdal/lib/krb5/crypto.c b/crypto/heimdal/lib/krb5/crypto.c deleted file mode 100644 index 2e63490..0000000 --- a/crypto/heimdal/lib/krb5/crypto.c +++ /dev/null @@ -1,4192 +0,0 @@ -/* - * Copyright (c) 1997 - 2005 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 22200 2007-12-07 13:48:01Z lha $"); - -#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 */ -#define F_DISABLED 64 /* enctype/checksum disabled */ - -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; - void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t); -}; - -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; - heim_oid *oid; - 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 encryptp, - int usage, - void *ivec); - size_t prf_length; - krb5_error_code (*prf)(krb5_context, - krb5_crypto, const krb5_data *, krb5_data *); -}; - -#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, unsigned *); -static void xor (DES_cblock *, const unsigned char *); - -/************************************************************ - * * - ************************************************************/ - -static HEIMDAL_MUTEX crypto_mutex = HEIMDAL_MUTEX_INITIALIZER; - - -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); -} - -#ifdef ENABLE_AFS_STRING_TO_KEY - -/* This defines the Andrew string_to_key function. It accepts a password - * string as input and converts it 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 ((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 ((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; -} -#endif /* ENABLE_AFS_STRING_TO_KEY */ - -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); - if(DES_is_weak_key(key)) - (*key)[7] ^= 0xF0; -} - -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; - -#ifdef ENABLE_AFS_STRING_TO_KEY - if (opaque.length == 1) { - unsigned long v; - _krb5_get_int(opaque.data, &v, 1); - if (v == 1) - return DES_AFS3_string_to_key(context, enctype, password, - salt, opaque, key); - } -#endif - - 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; -} - -static void -krb5_DES_random_to_key(krb5_context context, - krb5_keyblock *key, - const void *data, - size_t size) -{ - DES_cblock *k = key->keyvalue.data; - memcpy(k, data, key->keyvalue.length); - DES_set_odd_parity(k); - if(DES_is_weak_key(k)) - xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0"); -} - -/* - * - */ - -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]; - krb5_error_code ret; - - 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; - - ret = _krb5_n_fold(str, len, tmp, 24); - if (ret) { - memset(str, 0, len); - free(str); - krb5_set_error_string(context, "out of memory"); - return ret; - } - - 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(tmp, - 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; -} - -static void -DES3_random_to_key(krb5_context context, - krb5_keyblock *key, - const void *data, - size_t size) -{ - unsigned char *x = key->keyvalue.data; - const u_char *q = data; - DES_cblock *k; - 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 = q[7 * i + j]; - - x[8 * i + j] = b; - } - foo = 0; - for (j = 6; j >= 0; --j) { - foo |= q[7 * i + j] & 1; - foo <<= 1; - } - x[8 * i + 7] = foo; - } - k = key->keyvalue.data; - for (i = 0; i < 3; i++) { - DES_set_odd_parity(&k[i]); - if(DES_is_weak_key(&k[i])) - xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0"); - } -} - -/* - * ARCFOUR - */ - -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; - krb5_error_code ret; - - len = 2 * password.length; - s = malloc (len); - if (len != 0 && s == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - ret = ENOMEM; - goto out; - } - 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; - ret = krb5_data_alloc (&key->keyvalue, 16); - if (ret) { - krb5_set_error_string(context, "malloc: out of memory"); - goto out; - } - MD4_Final (key->keyvalue.data, &m); - memset (s, 0, len); - ret = 0; -out: - free (s); - return ret; -} - -/* - * AES - */ - -int _krb5_AES_string_to_default_iterator = 4096; - -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; - uint32_t iter; - struct encryption_type *et; - struct key_data kd; - - if (opaque.length == 0) - iter = _krb5_AES_string_to_default_iterator; - else if (opaque.length == 4) { - unsigned long v; - _krb5_get_int(opaque.data, &v, 4); - iter = ((uint32_t)v); - } else - return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */ - - et = _find_enctype(enctype); - if (et == NULL) - return KRB5_PROG_KEYTYPE_NOSUPP; - - kd.schedule = NULL; - ALLOC(kd.key, 1); - if(kd.key == NULL) { - krb5_set_error_string (context, "malloc: out of memory"); - return ENOMEM; - } - kd.key->keytype = enctype; - ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size); - if (ret) { - krb5_set_error_string(context, "Failed to allocate pkcs5 key"); - return ret; - } - - ret = PKCS5_PBKDF2_HMAC_SHA1(password.data, password.length, - salt.saltvalue.data, salt.saltvalue.length, - iter, - et->keytype->size, kd.key->keyvalue.data); - if (ret != 1) { - free_key_data(context, &kd); - krb5_set_error_string(context, "Error calculating s2k"); - return KRB5_PROG_KEYTYPE_NOSUPP; - } - - ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos")); - if (ret == 0) - ret = krb5_copy_keyblock_contents(context, kd.key, key); - free_key_data(context, &kd); - - return ret; -} - -struct krb5_aes_schedule { - AES_KEY ekey; - AES_KEY dkey; -}; - -static void -AES_schedule(krb5_context context, - struct key_data *kd) -{ - struct krb5_aes_schedule *key = kd->schedule->data; - int bits = kd->key->keyvalue.length * 8; - - memset(key, 0, sizeof(*key)); - AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key->ekey); - AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key->dkey); -} - -/* - * - */ - -static struct salt_type des_salt[] = { - { - KRB5_PW_SALT, - "pw-salt", - krb5_DES_string_to_key - }, -#ifdef ENABLE_AFS_STRING_TO_KEY - { - KRB5_AFS3_SALT, - "afs3-salt", - DES_AFS3_string_to_key - }, -#endif - { 0 } -}; - -static struct salt_type des3_salt[] = { - { - KRB5_PW_SALT, - "pw-salt", - DES3_string_to_key - }, - { 0 } -}; - -static struct salt_type des3_salt_derived[] = { - { - KRB5_PW_SALT, - "pw-salt", - DES3_string_to_key_derived - }, - { 0 } -}; - -static struct salt_type AES_salt[] = { - { - KRB5_PW_SALT, - "pw-salt", - AES_string_to_key - }, - { 0 } -}; - -static struct salt_type arcfour_salt[] = { - { - KRB5_PW_SALT, - "pw-salt", - ARCFOUR_string_to_key - }, - { 0 } -}; - -/* - * - */ - -static struct key_type keytype_null = { - KEYTYPE_NULL, - "null", - 0, - 0, - 0, - NULL, - NULL, - NULL -}; - -static 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, - krb5_DES_random_to_key -}; - -static 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, - DES3_random_to_key -}; - -static 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, - DES3_random_to_key -}; - -static struct key_type keytype_aes128 = { - KEYTYPE_AES128, - "aes-128", - 128, - 16, - sizeof(struct krb5_aes_schedule), - NULL, - AES_schedule, - AES_salt -}; - -static struct key_type keytype_aes256 = { - KEYTYPE_AES256, - "aes-256", - 256, - 32, - sizeof(struct krb5_aes_schedule), - NULL, - AES_schedule, - AES_salt -}; - -static struct key_type keytype_arcfour = { - KEYTYPE_ARCFOUR, - "arcfour", - 128, - 16, - sizeof(RC4_KEY), - NULL, - ARCFOUR_schedule, - arcfour_salt -}; - -static struct key_type *keytypes[] = { - &keytype_null, - &keytype_des, - &keytype_des3_derived, - &keytype_des3, - &keytype_aes128, - &keytype_aes256, - &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; -} - - -krb5_error_code KRB5_LIB_FUNCTION -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_LIB_FUNCTION -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_LIB_FUNCTION -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_LIB_FUNCTION -krb5_free_salt(krb5_context context, - krb5_salt salt) -{ - krb5_data_free(&salt.saltvalue); - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -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_LIB_FUNCTION -krb5_string_to_key (krb5_context context, - krb5_enctype enctype, - const char *password, - krb5_principal principal, - krb5_keyblock *key) -{ - krb5_data pw; - pw.data = rk_UNCONST(password); - pw.length = strlen(password); - return krb5_string_to_key_data(context, enctype, pw, principal, key); -} - -krb5_error_code KRB5_LIB_FUNCTION -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_LIB_FUNCTION -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); - struct salt_type *st; - if(et == NULL) { - krb5_set_error_string(context, "encryption type %d not supported", - enctype); - 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, opaque, key); - krb5_set_error_string(context, "salt type %d not supported", - salt.salttype); - return HEIM_ERR_SALTTYPE_NOSUPP; -} - -/* - * Do a string -> key for encryption type `enctype' operation on the - * string `password' (with salt `salt'), returning the resulting key - * in `key' - */ - -krb5_error_code KRB5_LIB_FUNCTION -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 = rk_UNCONST(password); - pw.length = strlen(password); - return krb5_string_to_key_data_salt(context, enctype, pw, salt, key); -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_string_to_key_salt_opaque (krb5_context context, - krb5_enctype enctype, - const char *password, - krb5_salt salt, - krb5_data opaque, - krb5_keyblock *key) -{ - krb5_data pw; - pw.data = rk_UNCONST(password); - pw.length = strlen(password); - return krb5_string_to_key_data_salt_opaque(context, enctype, - pw, salt, opaque, key); -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_keytype_to_string(krb5_context context, - krb5_keytype keytype, - char **string) -{ - struct key_type *kt = _find_keytype(keytype); - if(kt == NULL) { - krb5_set_error_string(context, "key type %d not supported", keytype); - return KRB5_PROG_KEYTYPE_NOSUPP; - } - *string = strdup(kt->name); - if(*string == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -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; - } - krb5_set_error_string(context, "key type %s not supported", string); - return KRB5_PROG_KEYTYPE_NOSUPP; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_enctype_keysize(krb5_context context, - krb5_enctype type, - size_t *keysize) -{ - struct encryption_type *et = _find_enctype(type); - if(et == NULL) { - krb5_set_error_string(context, "encryption type %d not supported", - type); - return KRB5_PROG_ETYPE_NOSUPP; - } - *keysize = et->keytype->size; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_enctype_keybits(krb5_context context, - krb5_enctype type, - size_t *keybits) -{ - struct encryption_type *et = _find_enctype(type); - if(et == NULL) { - krb5_set_error_string(context, "encryption type %d not supported", - type); - return KRB5_PROG_ETYPE_NOSUPP; - } - *keybits = et->keytype->bits; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -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) { - krb5_set_error_string(context, "encryption type %d not supported", - type); - 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; - if (key->schedule != NULL) - return 0; - ALLOC(key->schedule, 1); - if(key->schedule == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - 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, - const void *data, - size_t len, - unsigned usage, - Checksum *C) -{ -} - -static void -CRC32_checksum(krb5_context context, - struct key_data *key, - const void *data, - size_t len, - unsigned usage, - Checksum *C) -{ - uint32_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, - const void *data, - size_t len, - unsigned usage, - Checksum *C) -{ - MD4_CTX m; - - MD4_Init (&m); - MD4_Update (&m, data, len); - MD4_Final (C->checksum.data, &m); -} - -static void -RSA_MD4_DES_checksum(krb5_context context, - struct key_data *key, - const void *data, - size_t len, - unsigned usage, - Checksum *cksum) -{ - MD4_CTX md4; - DES_cblock ivec; - unsigned char *p = cksum->checksum.data; - - krb5_generate_random_block(p, 8); - MD4_Init (&md4); - MD4_Update (&md4, p, 8); - MD4_Update (&md4, data, len); - MD4_Final (p + 8, &md4); - memset (&ivec, 0, sizeof(ivec)); - DES_cbc_encrypt(p, - p, - 24, - key->schedule->data, - &ivec, - DES_ENCRYPT); -} - -static krb5_error_code -RSA_MD4_DES_verify(krb5_context context, - struct key_data *key, - const void *data, - size_t len, - unsigned usage, - 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); - MD4_Init (&md4); - MD4_Update (&md4, tmp, 8); /* confounder */ - MD4_Update (&md4, data, len); - MD4_Final (res, &md4); - if(memcmp(res, tmp + 8, sizeof(res)) != 0) { - krb5_clear_error_string (context); - 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, - const void *data, - size_t len, - unsigned usage, - Checksum *C) -{ - MD5_CTX m; - - MD5_Init (&m); - MD5_Update(&m, data, len); - MD5_Final (C->checksum.data, &m); -} - -static void -RSA_MD5_DES_checksum(krb5_context context, - struct key_data *key, - const void *data, - size_t len, - unsigned usage, - Checksum *C) -{ - MD5_CTX md5; - DES_cblock ivec; - unsigned char *p = C->checksum.data; - - krb5_generate_random_block(p, 8); - MD5_Init (&md5); - MD5_Update (&md5, p, 8); - MD5_Update (&md5, data, len); - MD5_Final (p + 8, &md5); - memset (&ivec, 0, sizeof(ivec)); - DES_cbc_encrypt(p, - p, - 24, - key->schedule->data, - &ivec, - DES_ENCRYPT); -} - -static krb5_error_code -RSA_MD5_DES_verify(krb5_context context, - struct key_data *key, - const void *data, - size_t len, - unsigned usage, - 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); - MD5_Init (&md5); - MD5_Update (&md5, tmp, 8); /* confounder */ - MD5_Update (&md5, data, len); - MD5_Final (res, &md5); - if(memcmp(res, tmp + 8, sizeof(res)) != 0) { - krb5_clear_error_string (context); - 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, - const void *data, - size_t len, - unsigned usage, - 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); - MD5_Init (&md5); - MD5_Update (&md5, p, 8); - MD5_Update (&md5, data, len); - MD5_Final (p + 8, &md5); - memset (&ivec, 0, sizeof(ivec)); - DES_ede3_cbc_encrypt(p, - 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, - const void *data, - size_t len, - unsigned usage, - 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); - MD5_Init (&md5); - MD5_Update (&md5, tmp, 8); /* confounder */ - MD5_Update (&md5, data, len); - MD5_Final (res, &md5); - if(memcmp(res, tmp + 8, sizeof(res)) != 0) { - krb5_clear_error_string (context); - 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, - const void *data, - size_t len, - unsigned usage, - Checksum *C) -{ - SHA_CTX m; - - SHA1_Init(&m); - SHA1_Update(&m, data, len); - SHA1_Final(C->checksum.data, &m); -} - -/* HMAC according to RFC2104 */ -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) -{ - unsigned char *ipad, *opad; - unsigned char *key; - size_t key_len; - int i; - - ipad = malloc(cm->blocksize + len); - if (ipad == NULL) - return ENOMEM; - opad = malloc(cm->blocksize + cm->checksumsize); - if (opad == NULL) { - free(ipad); - return ENOMEM; - } - memset(ipad, 0x36, cm->blocksize); - memset(opad, 0x5c, cm->blocksize); - - if(keyblock->key->keyvalue.length > cm->blocksize){ - (*cm->checksum)(context, - keyblock, - keyblock->key->keyvalue.data, - keyblock->key->keyvalue.length, - usage, - result); - key = result->checksum.data; - key_len = result->checksum.length; - } else { - key = keyblock->key->keyvalue.data; - key_len = keyblock->key->keyvalue.length; - } - 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, - usage, result); - memcpy(opad + cm->blocksize, result->checksum.data, - result->checksum.length); - (*cm->checksum)(context, keyblock, opad, - cm->blocksize + cm->checksumsize, usage, result); - memset(ipad, 0, cm->blocksize + len); - free(ipad); - memset(opad, 0, cm->blocksize + cm->checksumsize); - free(opad); - - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_hmac(krb5_context context, - krb5_cksumtype cktype, - const void *data, - size_t len, - unsigned usage, - krb5_keyblock *key, - Checksum *result) -{ - struct checksum_type *c = _find_checksum(cktype); - struct key_data kd; - krb5_error_code ret; - - if (c == NULL) { - krb5_set_error_string (context, "checksum type %d not supported", - cktype); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - - kd.key = key; - kd.schedule = NULL; - - ret = hmac(context, c, data, len, usage, &kd, result); - - if (kd.schedule) - krb5_free_data(context, kd.schedule); - - return ret; - } - -static void -SP_HMAC_SHA1_checksum(krb5_context context, - struct key_data *key, - const void *data, - size_t len, - unsigned usage, - Checksum *result) -{ - struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1); - Checksum res; - char sha1_data[20]; - krb5_error_code ret; - - res.checksum.data = sha1_data; - res.checksum.length = sizeof(sha1_data); - - ret = hmac(context, c, data, len, usage, key, &res); - if (ret) - krb5_abortx(context, "hmac failed"); - memcpy(result->checksum.data, res.checksum.data, result->checksum.length); -} - -/* - * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt - */ - -static void -HMAC_MD5_checksum(krb5_context context, - struct key_data *key, - const void *data, - size_t len, - unsigned usage, - Checksum *result) -{ - MD5_CTX md5; - struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5); - const char signature[] = "signaturekey"; - Checksum ksign_c; - struct key_data ksign; - krb5_keyblock kb; - unsigned char t[4]; - unsigned char tmp[16]; - unsigned char ksign_c_data[16]; - krb5_error_code ret; - - ksign_c.checksum.length = sizeof(ksign_c_data); - ksign_c.checksum.data = ksign_c_data; - ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c); - if (ret) - krb5_abortx(context, "hmac failed"); - ksign.key = &kb; - kb.keyvalue = ksign_c.checksum; - MD5_Init (&md5); - t[0] = (usage >> 0) & 0xFF; - t[1] = (usage >> 8) & 0xFF; - t[2] = (usage >> 16) & 0xFF; - t[3] = (usage >> 24) & 0xFF; - MD5_Update (&md5, t, 4); - MD5_Update (&md5, data, len); - MD5_Final (tmp, &md5); - ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result); - if (ret) - krb5_abortx(context, "hmac failed"); -} - -/* - * same as previous but being used while encrypting. - */ - -static void -HMAC_MD5_checksum_enc(krb5_context context, - struct key_data *key, - const void *data, - size_t len, - unsigned usage, - Checksum *result) -{ - struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5); - Checksum ksign_c; - struct key_data ksign; - krb5_keyblock kb; - unsigned char t[4]; - unsigned char ksign_c_data[16]; - krb5_error_code ret; - - t[0] = (usage >> 0) & 0xFF; - t[1] = (usage >> 8) & 0xFF; - t[2] = (usage >> 16) & 0xFF; - t[3] = (usage >> 24) & 0xFF; - - ksign_c.checksum.length = sizeof(ksign_c_data); - ksign_c.checksum.data = ksign_c_data; - ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c); - if (ret) - krb5_abortx(context, "hmac failed"); - ksign.key = &kb; - kb.keyvalue = ksign_c.checksum; - ret = hmac(context, c, data, len, 0, &ksign, result); - if (ret) - krb5_abortx(context, "hmac failed"); -} - -static struct checksum_type checksum_none = { - CKSUMTYPE_NONE, - "none", - 1, - 0, - 0, - NONE_checksum, - NULL -}; -static struct checksum_type checksum_crc32 = { - CKSUMTYPE_CRC32, - "crc32", - 1, - 4, - 0, - CRC32_checksum, - NULL -}; -static struct checksum_type checksum_rsa_md4 = { - CKSUMTYPE_RSA_MD4, - "rsa-md4", - 64, - 16, - F_CPROOF, - RSA_MD4_checksum, - NULL -}; -static 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 -static struct checksum_type checksum_des_mac = { - CKSUMTYPE_DES_MAC, - "des-mac", - 0, - 0, - 0, - DES_MAC_checksum -}; -static struct checksum_type checksum_des_mac_k = { - CKSUMTYPE_DES_MAC_K, - "des-mac-k", - 0, - 0, - 0, - DES_MAC_K_checksum -}; -static 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 -static struct checksum_type checksum_rsa_md5 = { - CKSUMTYPE_RSA_MD5, - "rsa-md5", - 64, - 16, - F_CPROOF, - RSA_MD5_checksum, - NULL -}; -static 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 -}; -static 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 -}; -static struct checksum_type checksum_sha1 = { - CKSUMTYPE_SHA1, - "sha1", - 64, - 20, - F_CPROOF, - SHA1_checksum, - NULL -}; -static struct checksum_type checksum_hmac_sha1_des3 = { - CKSUMTYPE_HMAC_SHA1_DES3, - "hmac-sha1-des3", - 64, - 20, - F_KEYED | F_CPROOF | F_DERIVED, - SP_HMAC_SHA1_checksum, - NULL -}; - -static struct checksum_type checksum_hmac_sha1_aes128 = { - CKSUMTYPE_HMAC_SHA1_96_AES_128, - "hmac-sha1-96-aes128", - 64, - 12, - F_KEYED | F_CPROOF | F_DERIVED, - SP_HMAC_SHA1_checksum, - NULL -}; - -static struct checksum_type checksum_hmac_sha1_aes256 = { - CKSUMTYPE_HMAC_SHA1_96_AES_256, - "hmac-sha1-96-aes256", - 64, - 12, - F_KEYED | F_CPROOF | F_DERIVED, - SP_HMAC_SHA1_checksum, - NULL -}; - -static struct checksum_type checksum_hmac_md5 = { - CKSUMTYPE_HMAC_MD5, - "hmac-md5", - 64, - 16, - F_KEYED | F_CPROOF, - HMAC_MD5_checksum, - NULL -}; - -static struct checksum_type checksum_hmac_md5_enc = { - CKSUMTYPE_HMAC_MD5_ENC, - "hmac-md5-enc", - 64, - 16, - F_KEYED | F_CPROOF | F_PSEUDO, - HMAC_MD5_checksum_enc, - NULL -}; - -static 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, - &checksum_hmac_sha1_aes128, - &checksum_hmac_sha1_aes256, - &checksum_hmac_md5, - &checksum_hmac_md5_enc -}; - -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) { - krb5_set_error_string(context, "malloc: out of memory"); - 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 -create_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; - - if (ct->flags & F_DISABLED) { - krb5_clear_error_string (context); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - keyed_checksum = (ct->flags & F_KEYED) != 0; - if(keyed_checksum && crypto == NULL) { - krb5_set_error_string (context, "Checksum type %s is keyed " - "but no crypto context (key) was passed in", - ct->name); - return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */ - } - if(keyed_checksum) { - ret = get_checksum_key(context, crypto, usage, ct, &dkey); - if (ret) - return ret; - } else - dkey = NULL; - result->cksumtype = ct->type; - ret = krb5_data_alloc(&result->checksum, ct->checksumsize); - if (ret) - return (ret); - (*ct->checksum)(context, dkey, data, len, usage, result); - return 0; -} - -static int -arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto) -{ - return (ct->type == CKSUMTYPE_HMAC_MD5) && - (crypto->key.key->keytype == KEYTYPE_ARCFOUR); -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_create_checksum(krb5_context context, - krb5_crypto crypto, - krb5_key_usage usage, - int type, - void *data, - size_t len, - Checksum *result) -{ - struct checksum_type *ct = NULL; - unsigned keyusage; - - /* type 0 -> pick from crypto */ - if (type) { - ct = _find_checksum(type); - } else if (crypto) { - ct = crypto->et->keyed_checksum; - if (ct == NULL) - ct = crypto->et->checksum; - } - - if(ct == NULL) { - krb5_set_error_string (context, "checksum type %d not supported", - type); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - - if (arcfour_checksum_p(ct, crypto)) { - keyusage = usage; - usage2arcfour(context, &keyusage); - } else - keyusage = CHECKSUM_USAGE(usage); - - return create_checksum(context, ct, crypto, keyusage, - 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 || (ct->flags & F_DISABLED)) { - krb5_set_error_string (context, "checksum type %d not supported", - cksum->cksumtype); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - if(ct->checksumsize != cksum->checksum.length) { - krb5_clear_error_string (context); - return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */ - } - keyed_checksum = (ct->flags & F_KEYED) != 0; - if(keyed_checksum && crypto == NULL) { - krb5_set_error_string (context, "Checksum type %s is keyed " - "but no crypto context (key) was passed in", - ct->name); - 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, usage, cksum); - - ret = krb5_data_alloc (&c.checksum, ct->checksumsize); - if (ret) - return ret; - - (*ct->checksum)(context, dkey, data, len, usage, &c); - - if(c.checksum.length != cksum->checksum.length || - memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) { - krb5_clear_error_string (context); - ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; - } else { - ret = 0; - } - krb5_data_free (&c.checksum); - return ret; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_verify_checksum(krb5_context context, - krb5_crypto crypto, - krb5_key_usage usage, - void *data, - size_t len, - Checksum *cksum) -{ - struct checksum_type *ct; - unsigned keyusage; - - ct = _find_checksum(cksum->cksumtype); - if(ct == NULL) { - krb5_set_error_string (context, "checksum type %d not supported", - cksum->cksumtype); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - - if (arcfour_checksum_p(ct, crypto)) { - keyusage = usage; - usage2arcfour(context, &keyusage); - } else - keyusage = CHECKSUM_USAGE(usage); - - return verify_checksum(context, crypto, keyusage, - data, len, cksum); -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_crypto_get_checksum_type(krb5_context context, - krb5_crypto crypto, - krb5_cksumtype *type) -{ - struct checksum_type *ct = NULL; - - if (crypto != NULL) { - ct = crypto->et->keyed_checksum; - if (ct == NULL) - ct = crypto->et->checksum; - } - - if (ct == NULL) { - krb5_set_error_string (context, "checksum type not found"); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - - *type = ct->type; - - return 0; -} - - -krb5_error_code KRB5_LIB_FUNCTION -krb5_checksumsize(krb5_context context, - krb5_cksumtype type, - size_t *size) -{ - struct checksum_type *ct = _find_checksum(type); - if(ct == NULL) { - krb5_set_error_string (context, "checksum type %d not supported", - type); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - *size = ct->checksumsize; - return 0; -} - -krb5_boolean KRB5_LIB_FUNCTION -krb5_checksum_is_keyed(krb5_context context, - krb5_cksumtype type) -{ - struct checksum_type *ct = _find_checksum(type); - if(ct == NULL) { - if (context) - krb5_set_error_string (context, "checksum type %d not supported", - type); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - return ct->flags & F_KEYED; -} - -krb5_boolean KRB5_LIB_FUNCTION -krb5_checksum_is_collision_proof(krb5_context context, - krb5_cksumtype type) -{ - struct checksum_type *ct = _find_checksum(type); - if(ct == NULL) { - if (context) - krb5_set_error_string (context, "checksum type %d not supported", - type); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - return ct->flags & F_CPROOF; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_checksum_disable(krb5_context context, - krb5_cksumtype type) -{ - struct checksum_type *ct = _find_checksum(type); - if(ct == NULL) { - if (context) - krb5_set_error_string (context, "checksum type %d not supported", - type); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - ct->flags |= F_DISABLED; - return 0; -} - -/************************************************************ - * * - ************************************************************/ - -static krb5_error_code -NULL_encrypt(krb5_context context, - struct key_data *key, - void *data, - size_t len, - krb5_boolean encryptp, - int usage, - void *ivec) -{ - return 0; -} - -static krb5_error_code -DES_CBC_encrypt_null_ivec(krb5_context context, - struct key_data *key, - void *data, - size_t len, - krb5_boolean encryptp, - int usage, - void *ignore_ivec) -{ - DES_cblock ivec; - DES_key_schedule *s = key->schedule->data; - memset(&ivec, 0, sizeof(ivec)); - DES_cbc_encrypt(data, data, len, s, &ivec, encryptp); - return 0; -} - -static krb5_error_code -DES_CBC_encrypt_key_ivec(krb5_context context, - struct key_data *key, - void *data, - size_t len, - krb5_boolean encryptp, - int usage, - void *ignore_ivec) -{ - 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, encryptp); - return 0; -} - -static krb5_error_code -DES3_CBC_encrypt(krb5_context context, - struct key_data *key, - void *data, - size_t len, - krb5_boolean encryptp, - int usage, - void *ivec) -{ - DES_cblock local_ivec; - DES_key_schedule *s = key->schedule->data; - if(ivec == NULL) { - ivec = &local_ivec; - memset(local_ivec, 0, sizeof(local_ivec)); - } - DES_ede3_cbc_encrypt(data, data, len, &s[0], &s[1], &s[2], ivec, encryptp); - return 0; -} - -static krb5_error_code -DES_CFB64_encrypt_null_ivec(krb5_context context, - struct key_data *key, - void *data, - size_t len, - krb5_boolean encryptp, - int usage, - void *ignore_ivec) -{ - DES_cblock ivec; - int num = 0; - DES_key_schedule *s = key->schedule->data; - memset(&ivec, 0, sizeof(ivec)); - - DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp); - return 0; -} - -static krb5_error_code -DES_PCBC_encrypt_key_ivec(krb5_context context, - struct key_data *key, - void *data, - size_t len, - krb5_boolean encryptp, - int usage, - void *ignore_ivec) -{ - DES_cblock ivec; - DES_key_schedule *s = key->schedule->data; - memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec)); - - DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp); - return 0; -} - -/* - * AES draft-raeburn-krb-rijndael-krb-02 - */ - -void KRB5_LIB_FUNCTION -_krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out, - size_t len, const AES_KEY *key, - unsigned char *ivec, const int encryptp) -{ - unsigned char tmp[AES_BLOCK_SIZE]; - int i; - - /* - * In the framework of kerberos, the length can never be shorter - * then at least one blocksize. - */ - - if (encryptp) { - - while(len > AES_BLOCK_SIZE) { - for (i = 0; i < AES_BLOCK_SIZE; i++) - tmp[i] = in[i] ^ ivec[i]; - AES_encrypt(tmp, out, key); - memcpy(ivec, out, AES_BLOCK_SIZE); - len -= AES_BLOCK_SIZE; - in += AES_BLOCK_SIZE; - out += AES_BLOCK_SIZE; - } - - for (i = 0; i < len; i++) - tmp[i] = in[i] ^ ivec[i]; - for (; i < AES_BLOCK_SIZE; i++) - tmp[i] = 0 ^ ivec[i]; - - AES_encrypt(tmp, out - AES_BLOCK_SIZE, key); - - memcpy(out, ivec, len); - memcpy(ivec, out - AES_BLOCK_SIZE, AES_BLOCK_SIZE); - - } else { - unsigned char tmp2[AES_BLOCK_SIZE]; - unsigned char tmp3[AES_BLOCK_SIZE]; - - while(len > AES_BLOCK_SIZE * 2) { - memcpy(tmp, in, AES_BLOCK_SIZE); - AES_decrypt(in, out, key); - for (i = 0; i < AES_BLOCK_SIZE; i++) - out[i] ^= ivec[i]; - memcpy(ivec, tmp, AES_BLOCK_SIZE); - len -= AES_BLOCK_SIZE; - in += AES_BLOCK_SIZE; - out += AES_BLOCK_SIZE; - } - - len -= AES_BLOCK_SIZE; - - memcpy(tmp, in, AES_BLOCK_SIZE); /* save last iv */ - AES_decrypt(in, tmp2, key); - - memcpy(tmp3, in + AES_BLOCK_SIZE, len); - memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */ - - for (i = 0; i < len; i++) - out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i]; - - AES_decrypt(tmp3, out, key); - for (i = 0; i < AES_BLOCK_SIZE; i++) - out[i] ^= ivec[i]; - memcpy(ivec, tmp, AES_BLOCK_SIZE); - } -} - -static krb5_error_code -AES_CTS_encrypt(krb5_context context, - struct key_data *key, - void *data, - size_t len, - krb5_boolean encryptp, - int usage, - void *ivec) -{ - struct krb5_aes_schedule *aeskey = key->schedule->data; - char local_ivec[AES_BLOCK_SIZE]; - AES_KEY *k; - - if (encryptp) - k = &aeskey->ekey; - else - k = &aeskey->dkey; - - if (len < AES_BLOCK_SIZE) - krb5_abortx(context, "invalid use of AES_CTS_encrypt"); - if (len == AES_BLOCK_SIZE) { - if (encryptp) - AES_encrypt(data, data, k); - else - AES_decrypt(data, data, k); - } else { - if(ivec == NULL) { - memset(local_ivec, 0, sizeof(local_ivec)); - ivec = local_ivec; - } - _krb5_aes_cts_encrypt(data, data, len, k, ivec, encryptp); - } - - return 0; -} - -/* - * section 6 of draft-brezak-win2k-krb-rc4-hmac-03 - * - * warning: not for small children - */ - -static krb5_error_code -ARCFOUR_subencrypt(krb5_context context, - struct key_data *key, - void *data, - size_t len, - unsigned usage, - void *ivec) -{ - struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5); - Checksum k1_c, k2_c, k3_c, cksum; - struct key_data ke; - krb5_keyblock kb; - unsigned char t[4]; - RC4_KEY rc4_key; - unsigned char *cdata = data; - unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16]; - krb5_error_code ret; - - t[0] = (usage >> 0) & 0xFF; - t[1] = (usage >> 8) & 0xFF; - t[2] = (usage >> 16) & 0xFF; - t[3] = (usage >> 24) & 0xFF; - - k1_c.checksum.length = sizeof(k1_c_data); - k1_c.checksum.data = k1_c_data; - - ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c); - if (ret) - krb5_abortx(context, "hmac failed"); - - memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data)); - - k2_c.checksum.length = sizeof(k2_c_data); - k2_c.checksum.data = k2_c_data; - - ke.key = &kb; - kb.keyvalue = k2_c.checksum; - - cksum.checksum.length = 16; - cksum.checksum.data = data; - - ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum); - if (ret) - krb5_abortx(context, "hmac failed"); - - ke.key = &kb; - kb.keyvalue = k1_c.checksum; - - k3_c.checksum.length = sizeof(k3_c_data); - k3_c.checksum.data = k3_c_data; - - ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c); - if (ret) - krb5_abortx(context, "hmac failed"); - - RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data); - RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16); - memset (k1_c_data, 0, sizeof(k1_c_data)); - memset (k2_c_data, 0, sizeof(k2_c_data)); - memset (k3_c_data, 0, sizeof(k3_c_data)); - return 0; -} - -static krb5_error_code -ARCFOUR_subdecrypt(krb5_context context, - struct key_data *key, - void *data, - size_t len, - unsigned usage, - void *ivec) -{ - struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5); - Checksum k1_c, k2_c, k3_c, cksum; - struct key_data ke; - krb5_keyblock kb; - unsigned char t[4]; - RC4_KEY rc4_key; - unsigned char *cdata = data; - unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16]; - unsigned char cksum_data[16]; - krb5_error_code ret; - - t[0] = (usage >> 0) & 0xFF; - t[1] = (usage >> 8) & 0xFF; - t[2] = (usage >> 16) & 0xFF; - t[3] = (usage >> 24) & 0xFF; - - k1_c.checksum.length = sizeof(k1_c_data); - k1_c.checksum.data = k1_c_data; - - ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c); - if (ret) - krb5_abortx(context, "hmac failed"); - - memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data)); - - k2_c.checksum.length = sizeof(k2_c_data); - k2_c.checksum.data = k2_c_data; - - ke.key = &kb; - kb.keyvalue = k1_c.checksum; - - k3_c.checksum.length = sizeof(k3_c_data); - k3_c.checksum.data = k3_c_data; - - ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c); - if (ret) - krb5_abortx(context, "hmac failed"); - - RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data); - RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16); - - ke.key = &kb; - kb.keyvalue = k2_c.checksum; - - cksum.checksum.length = 16; - cksum.checksum.data = cksum_data; - - ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum); - if (ret) - krb5_abortx(context, "hmac failed"); - - memset (k1_c_data, 0, sizeof(k1_c_data)); - memset (k2_c_data, 0, sizeof(k2_c_data)); - memset (k3_c_data, 0, sizeof(k3_c_data)); - - if (memcmp (cksum.checksum.data, data, 16) != 0) { - krb5_clear_error_string (context); - return KRB5KRB_AP_ERR_BAD_INTEGRITY; - } else { - return 0; - } -} - -/* - * convert the usage numbers used in - * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in - * draft-brezak-win2k-krb-rc4-hmac-04.txt - */ - -static krb5_error_code -usage2arcfour (krb5_context context, unsigned *usage) -{ - switch (*usage) { - case KRB5_KU_AS_REP_ENC_PART : /* 3 */ - case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */ - *usage = 8; - return 0; - case KRB5_KU_USAGE_SEAL : /* 22 */ - *usage = 13; - return 0; - case KRB5_KU_USAGE_SIGN : /* 23 */ - *usage = 15; - return 0; - case KRB5_KU_USAGE_SEQ: /* 24 */ - *usage = 0; - return 0; - default : - return 0; - } -} - -static krb5_error_code -ARCFOUR_encrypt(krb5_context context, - struct key_data *key, - void *data, - size_t len, - krb5_boolean encryptp, - int usage, - void *ivec) -{ - krb5_error_code ret; - unsigned keyusage = usage; - - if((ret = usage2arcfour (context, &keyusage)) != 0) - return ret; - - if (encryptp) - return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec); - else - return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec); -} - - -/* - * - */ - -static krb5_error_code -AES_PRF(krb5_context context, - krb5_crypto crypto, - const krb5_data *in, - krb5_data *out) -{ - struct checksum_type *ct = crypto->et->checksum; - krb5_error_code ret; - Checksum result; - krb5_keyblock *derived; - - result.cksumtype = ct->type; - ret = krb5_data_alloc(&result.checksum, ct->checksumsize); - if (ret) { - krb5_set_error_string(context, "out memory"); - return ret; - } - - (*ct->checksum)(context, NULL, in->data, in->length, 0, &result); - - if (result.checksum.length < crypto->et->blocksize) - krb5_abortx(context, "internal prf error"); - - derived = NULL; - ret = krb5_derive_key(context, crypto->key.key, - crypto->et->type, "prf", 3, &derived); - if (ret) - krb5_abortx(context, "krb5_derive_key"); - - ret = krb5_data_alloc(out, crypto->et->blocksize); - if (ret) - krb5_abortx(context, "malloc failed"); - - { - AES_KEY key; - - AES_set_encrypt_key(derived->keyvalue.data, - crypto->et->keytype->bits, &key); - AES_encrypt(result.checksum.data, out->data, &key); - memset(&key, 0, sizeof(key)); - } - - krb5_data_free(&result.checksum); - krb5_free_keyblock(context, derived); - - return ret; -} - -/* - * these should currently be in reverse preference order. - * (only relevant for !F_PSEUDO) */ - -static struct encryption_type enctype_null = { - ETYPE_NULL, - "null", - NULL, - 1, - 1, - 0, - &keytype_null, - &checksum_none, - NULL, - F_DISABLED, - NULL_encrypt, - 0, - NULL -}; -static struct encryption_type enctype_des_cbc_crc = { - ETYPE_DES_CBC_CRC, - "des-cbc-crc", - NULL, - 8, - 8, - 8, - &keytype_des, - &checksum_crc32, - NULL, - 0, - DES_CBC_encrypt_key_ivec, - 0, - NULL -}; -static struct encryption_type enctype_des_cbc_md4 = { - ETYPE_DES_CBC_MD4, - "des-cbc-md4", - NULL, - 8, - 8, - 8, - &keytype_des, - &checksum_rsa_md4, - &checksum_rsa_md4_des, - 0, - DES_CBC_encrypt_null_ivec, - 0, - NULL -}; -static struct encryption_type enctype_des_cbc_md5 = { - ETYPE_DES_CBC_MD5, - "des-cbc-md5", - NULL, - 8, - 8, - 8, - &keytype_des, - &checksum_rsa_md5, - &checksum_rsa_md5_des, - 0, - DES_CBC_encrypt_null_ivec, - 0, - NULL -}; -static struct encryption_type enctype_arcfour_hmac_md5 = { - ETYPE_ARCFOUR_HMAC_MD5, - "arcfour-hmac-md5", - NULL, - 1, - 1, - 8, - &keytype_arcfour, - &checksum_hmac_md5, - NULL, - F_SPECIAL, - ARCFOUR_encrypt, - 0, - NULL -}; -static struct encryption_type enctype_des3_cbc_md5 = { - ETYPE_DES3_CBC_MD5, - "des3-cbc-md5", - NULL, - 8, - 8, - 8, - &keytype_des3, - &checksum_rsa_md5, - &checksum_rsa_md5_des3, - 0, - DES3_CBC_encrypt, - 0, - NULL -}; -static struct encryption_type enctype_des3_cbc_sha1 = { - ETYPE_DES3_CBC_SHA1, - "des3-cbc-sha1", - NULL, - 8, - 8, - 8, - &keytype_des3_derived, - &checksum_sha1, - &checksum_hmac_sha1_des3, - F_DERIVED, - DES3_CBC_encrypt, - 0, - NULL -}; -static struct encryption_type enctype_old_des3_cbc_sha1 = { - ETYPE_OLD_DES3_CBC_SHA1, - "old-des3-cbc-sha1", - NULL, - 8, - 8, - 8, - &keytype_des3, - &checksum_sha1, - &checksum_hmac_sha1_des3, - 0, - DES3_CBC_encrypt, - 0, - NULL -}; -static struct encryption_type enctype_aes128_cts_hmac_sha1 = { - ETYPE_AES128_CTS_HMAC_SHA1_96, - "aes128-cts-hmac-sha1-96", - NULL, - 16, - 1, - 16, - &keytype_aes128, - &checksum_sha1, - &checksum_hmac_sha1_aes128, - F_DERIVED, - AES_CTS_encrypt, - 16, - AES_PRF -}; -static struct encryption_type enctype_aes256_cts_hmac_sha1 = { - ETYPE_AES256_CTS_HMAC_SHA1_96, - "aes256-cts-hmac-sha1-96", - NULL, - 16, - 1, - 16, - &keytype_aes256, - &checksum_sha1, - &checksum_hmac_sha1_aes256, - F_DERIVED, - AES_CTS_encrypt, - 16, - AES_PRF -}; -static struct encryption_type enctype_des_cbc_none = { - ETYPE_DES_CBC_NONE, - "des-cbc-none", - NULL, - 8, - 8, - 0, - &keytype_des, - &checksum_none, - NULL, - F_PSEUDO, - DES_CBC_encrypt_null_ivec, - 0, - NULL -}; -static struct encryption_type enctype_des_cfb64_none = { - ETYPE_DES_CFB64_NONE, - "des-cfb64-none", - NULL, - 1, - 1, - 0, - &keytype_des, - &checksum_none, - NULL, - F_PSEUDO, - DES_CFB64_encrypt_null_ivec, - 0, - NULL -}; -static struct encryption_type enctype_des_pcbc_none = { - ETYPE_DES_PCBC_NONE, - "des-pcbc-none", - NULL, - 8, - 8, - 0, - &keytype_des, - &checksum_none, - NULL, - F_PSEUDO, - DES_PCBC_encrypt_key_ivec, - 0, - NULL -}; -static struct encryption_type enctype_des3_cbc_none = { - ETYPE_DES3_CBC_NONE, - "des3-cbc-none", - NULL, - 8, - 8, - 0, - &keytype_des3_derived, - &checksum_none, - NULL, - F_PSEUDO, - DES3_CBC_encrypt, - 0, - NULL -}; - -static struct encryption_type *etypes[] = { - &enctype_null, - &enctype_des_cbc_crc, - &enctype_des_cbc_md4, - &enctype_des_cbc_md5, - &enctype_arcfour_hmac_md5, - &enctype_des3_cbc_md5, - &enctype_des3_cbc_sha1, - &enctype_old_des3_cbc_sha1, - &enctype_aes128_cts_hmac_sha1, - &enctype_aes256_cts_hmac_sha1, - &enctype_des_cbc_none, - &enctype_des_cfb64_none, - &enctype_des_pcbc_none, - &enctype_des3_cbc_none -}; - -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_LIB_FUNCTION -krb5_enctype_to_string(krb5_context context, - krb5_enctype etype, - char **string) -{ - struct encryption_type *e; - e = _find_enctype(etype); - if(e == NULL) { - krb5_set_error_string (context, "encryption type %d not supported", - etype); - *string = NULL; - return KRB5_PROG_ETYPE_NOSUPP; - } - *string = strdup(e->name); - if(*string == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -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; - } - krb5_set_error_string (context, "encryption type %s not supported", - string); - return KRB5_PROG_ETYPE_NOSUPP; -} - -krb5_error_code KRB5_LIB_FUNCTION -_krb5_enctype_to_oid(krb5_context context, - krb5_enctype etype, - heim_oid *oid) -{ - struct encryption_type *et = _find_enctype(etype); - if(et == NULL) { - krb5_set_error_string (context, "encryption type %d not supported", - etype); - return KRB5_PROG_ETYPE_NOSUPP; - } - if(et->oid == NULL) { - krb5_set_error_string (context, "%s have not oid", et->name); - return KRB5_PROG_ETYPE_NOSUPP; - } - krb5_clear_error_string(context); - return der_copy_oid(et->oid, oid); -} - -krb5_error_code KRB5_LIB_FUNCTION -_krb5_oid_to_enctype(krb5_context context, - const heim_oid *oid, - krb5_enctype *etype) -{ - int i; - for(i = 0; i < num_etypes; i++) { - if(etypes[i]->oid && der_heim_oid_cmp(etypes[i]->oid, oid) == 0) { - *etype = etypes[i]->type; - return 0; - } - } - krb5_set_error_string(context, "enctype for oid not supported"); - return KRB5_PROG_ETYPE_NOSUPP; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_enctype_to_keytype(krb5_context context, - krb5_enctype etype, - krb5_keytype *keytype) -{ - struct encryption_type *e = _find_enctype(etype); - if(e == NULL) { - krb5_set_error_string (context, "encryption type %d not supported", - etype); - return KRB5_PROG_ETYPE_NOSUPP; - } - *keytype = e->keytype->type; /* XXX */ - return 0; -} - -#if 0 -krb5_error_code KRB5_LIB_FUNCTION -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_LIB_FUNCTION -krb5_keytype_to_enctypes (krb5_context context, - krb5_keytype keytype, - unsigned *len, - krb5_enctype **val) -{ - int i; - unsigned n = 0; - krb5_enctype *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(*ret)); - if (ret == NULL && n != 0) { - krb5_set_error_string(context, "malloc: out of memory"); - 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_LIB_FUNCTION -krb5_keytype_to_enctypes_default (krb5_context context, - krb5_keytype keytype, - unsigned *len, - krb5_enctype **val) -{ - int i, n; - krb5_enctype *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) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - for (i = 0; i < n; ++i) - ret[i] = context->etypes_des[i]; - *len = n; - *val = ret; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_enctype_valid(krb5_context context, - krb5_enctype etype) -{ - struct encryption_type *e = _find_enctype(etype); - if(e == NULL) { - krb5_set_error_string (context, "encryption type %d not supported", - etype); - return KRB5_PROG_ETYPE_NOSUPP; - } - if (e->flags & F_DISABLED) { - krb5_set_error_string (context, "encryption type %s is disabled", - e->name); - return KRB5_PROG_ETYPE_NOSUPP; - } - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_cksumtype_valid(krb5_context context, - krb5_cksumtype ctype) -{ - struct checksum_type *c = _find_checksum(ctype); - if (c == NULL) { - krb5_set_error_string (context, "checksum type %d not supported", - ctype); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - if (c->flags & F_DISABLED) { - krb5_set_error_string (context, "checksum type %s is disabled", - c->name); - return KRB5_PROG_SUMTYPE_NOSUPP; - } - return 0; -} - - -/* if two enctypes have compatible keys */ -krb5_boolean KRB5_LIB_FUNCTION -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; -} - -static krb5_boolean -special_crypto(krb5_context context, - krb5_crypto crypto) -{ - return (crypto->et->flags & F_SPECIAL) != 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, - const void *data, - size_t len, - krb5_data *result, - void *ivec) -{ - size_t sz, block_sz, checksum_sz, total_sz; - Checksum cksum; - unsigned char *p, *q; - krb5_error_code ret; - struct key_data *dkey; - const struct encryption_type *et = crypto->et; - - checksum_sz = CHECKSUMSIZE(et->keyed_checksum); - - sz = et->confoundersize + len; - block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */ - total_sz = block_sz + checksum_sz; - p = calloc(1, total_sz); - if(p == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - - q = p; - krb5_generate_random_block(q, et->confoundersize); /* XXX */ - q += et->confoundersize; - memcpy(q, data, len); - - ret = create_checksum(context, - et->keyed_checksum, - crypto, - INTEGRITY_USAGE(usage), - p, - block_sz, - &cksum); - if(ret == 0 && cksum.checksum.length != checksum_sz) { - free_Checksum (&cksum); - krb5_clear_error_string (context); - ret = KRB5_CRYPTO_INTERNAL; - } - if(ret) - goto fail; - memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length); - free_Checksum (&cksum); - ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey); - if(ret) - goto fail; - ret = _key_schedule(context, dkey); - if(ret) - goto fail; -#ifdef CRYPTO_DEBUG - krb5_crypto_debug(context, 1, block_sz, dkey->key); -#endif - ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec); - if (ret) - goto fail; - result->data = p; - result->length = total_sz; - return 0; - fail: - memset(p, 0, total_sz); - free(p); - return ret; -} - - -static krb5_error_code -encrypt_internal(krb5_context context, - krb5_crypto crypto, - const void *data, - size_t len, - krb5_data *result, - void *ivec) -{ - size_t sz, block_sz, checksum_sz; - Checksum cksum; - unsigned char *p, *q; - krb5_error_code ret; - const struct encryption_type *et = crypto->et; - - checksum_sz = CHECKSUMSIZE(et->checksum); - - sz = et->confoundersize + checksum_sz + len; - block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */ - p = calloc(1, block_sz); - if(p == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - 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, - et->checksum, - crypto, - 0, - p, - block_sz, - &cksum); - if(ret == 0 && cksum.checksum.length != checksum_sz) { - krb5_clear_error_string (context); - free_Checksum(&cksum); - ret = KRB5_CRYPTO_INTERNAL; - } - if(ret) - goto fail; - memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length); - free_Checksum(&cksum); - ret = _key_schedule(context, &crypto->key); - if(ret) - goto fail; -#ifdef CRYPTO_DEBUG - krb5_crypto_debug(context, 1, block_sz, crypto->key.key); -#endif - ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec); - if (ret) { - memset(p, 0, block_sz); - free(p); - return ret; - } - result->data = p; - result->length = block_sz; - return 0; - fail: - memset(p, 0, block_sz); - free(p); - return ret; -} - -static krb5_error_code -encrypt_internal_special(krb5_context context, - krb5_crypto crypto, - int usage, - const void *data, - size_t len, - krb5_data *result, - void *ivec) -{ - struct encryption_type *et = crypto->et; - size_t cksum_sz = CHECKSUMSIZE(et->checksum); - size_t sz = len + cksum_sz + et->confoundersize; - char *tmp, *p; - krb5_error_code ret; - - tmp = malloc (sz); - if (tmp == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - p = tmp; - memset (p, 0, cksum_sz); - p += cksum_sz; - krb5_generate_random_block(p, et->confoundersize); - p += et->confoundersize; - memcpy (p, data, len); - ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec); - if (ret) { - memset(tmp, 0, sz); - free(tmp); - return ret; - } - result->data = tmp; - result->length = 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, - void *ivec) -{ - 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; - - checksum_sz = CHECKSUMSIZE(et->keyed_checksum); - if (len < checksum_sz + et->confoundersize) { - krb5_set_error_string(context, "Encrypted data shorter then " - "checksum + confunder"); - return KRB5_BAD_MSIZE; - } - - if (((len - checksum_sz) % et->padsize) != 0) { - krb5_clear_error_string(context); - return KRB5_BAD_MSIZE; - } - - p = malloc(len); - if(len != 0 && p == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - memcpy(p, data, len); - - 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 - ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec); - if (ret) { - free(p); - return ret; - } - - 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(result->data == NULL && l != 0) { - free(p); - krb5_set_error_string(context, "malloc: out of memory"); - 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, - void *ivec) -{ - krb5_error_code ret; - unsigned char *p; - Checksum cksum; - size_t checksum_sz, l; - struct encryption_type *et = crypto->et; - - if ((len % et->padsize) != 0) { - krb5_clear_error_string(context); - return KRB5_BAD_MSIZE; - } - - checksum_sz = CHECKSUMSIZE(et->checksum); - p = malloc(len); - if(len != 0 && p == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - 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 - ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec); - if (ret) { - free(p); - return ret; - } - 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->checksum); - 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 && l != 0) { - free(p); - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - result->length = l; - return 0; -} - -static krb5_error_code -decrypt_internal_special(krb5_context context, - krb5_crypto crypto, - int usage, - void *data, - size_t len, - krb5_data *result, - void *ivec) -{ - struct encryption_type *et = crypto->et; - size_t cksum_sz = CHECKSUMSIZE(et->checksum); - size_t sz = len - cksum_sz - et->confoundersize; - unsigned char *p; - krb5_error_code ret; - - if ((len % et->padsize) != 0) { - krb5_clear_error_string(context); - return KRB5_BAD_MSIZE; - } - - p = malloc (len); - if (p == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - memcpy(p, data, len); - - ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec); - if (ret) { - free(p); - return ret; - } - - memmove (p, p + cksum_sz + et->confoundersize, sz); - result->data = realloc(p, sz); - if(result->data == NULL && sz != 0) { - free(p); - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - result->length = sz; - return 0; -} - - -krb5_error_code KRB5_LIB_FUNCTION -krb5_encrypt_ivec(krb5_context context, - krb5_crypto crypto, - unsigned usage, - const void *data, - size_t len, - krb5_data *result, - void *ivec) -{ - if(derived_crypto(context, crypto)) - return encrypt_internal_derived(context, crypto, usage, - data, len, result, ivec); - else if (special_crypto(context, crypto)) - return encrypt_internal_special (context, crypto, usage, - data, len, result, ivec); - else - return encrypt_internal(context, crypto, data, len, result, ivec); -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_encrypt(krb5_context context, - krb5_crypto crypto, - unsigned usage, - const void *data, - size_t len, - krb5_data *result) -{ - return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL); -} - -krb5_error_code KRB5_LIB_FUNCTION -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_LIB_FUNCTION -krb5_decrypt_ivec(krb5_context context, - krb5_crypto crypto, - unsigned usage, - void *data, - size_t len, - krb5_data *result, - void *ivec) -{ - if(derived_crypto(context, crypto)) - return decrypt_internal_derived(context, crypto, usage, - data, len, result, ivec); - else if (special_crypto (context, crypto)) - return decrypt_internal_special(context, crypto, usage, - data, len, result, ivec); - else - return decrypt_internal(context, crypto, data, len, result, ivec); -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_decrypt(krb5_context context, - krb5_crypto crypto, - unsigned usage, - void *data, - size_t len, - krb5_data *result) -{ - return krb5_decrypt_ivec (context, crypto, usage, data, len, result, - NULL); -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_decrypt_EncryptedData(krb5_context context, - krb5_crypto crypto, - unsigned usage, - const EncryptedData *e, - krb5_data *result) -{ - return krb5_decrypt(context, crypto, usage, - e->cipher.data, e->cipher.length, result); -} - -/************************************************************ - * * - ************************************************************/ - -#define ENTROPY_NEEDED 128 - -static int -seed_something(void) -{ - char buf[1024], seedfile[256]; - - /* If there is a seed file, load it. But such a file cannot be trusted, - so use 0 for the entropy estimate */ - if (RAND_file_name(seedfile, sizeof(seedfile))) { - int fd; - fd = open(seedfile, O_RDONLY); - if (fd >= 0) { - ssize_t ret; - ret = read(fd, buf, sizeof(buf)); - if (ret > 0) - RAND_add(buf, ret, 0.0); - close(fd); - } else - seedfile[0] = '\0'; - } else - seedfile[0] = '\0'; - - /* Calling RAND_status() will try to use /dev/urandom if it exists so - we do not have to deal with it. */ - if (RAND_status() != 1) { - krb5_context context; - const char *p; - - /* Try using egd */ - if (!krb5_init_context(&context)) { - p = krb5_config_get_string(context, NULL, "libdefaults", - "egd_socket", NULL); - if (p != NULL) - RAND_egd_bytes(p, ENTROPY_NEEDED); - krb5_free_context(context); - } - } - - if (RAND_status() == 1) { - /* Update the seed file */ - if (seedfile[0]) - RAND_write_file(seedfile); - - return 0; - } else - return -1; -} - -void KRB5_LIB_FUNCTION -krb5_generate_random_block(void *buf, size_t len) -{ - static int rng_initialized = 0; - - HEIMDAL_MUTEX_lock(&crypto_mutex); - if (!rng_initialized) { - if (seed_something()) - krb5_abortx(NULL, "Fatal: could not seed the " - "random number generator"); - - rng_initialized = 1; - } - HEIMDAL_MUTEX_unlock(&crypto_mutex); - if (RAND_bytes(buf, len) != 1) - krb5_abortx(NULL, "Failed to generate random block"); -} - -static void -DES3_postproc(krb5_context context, - unsigned char *k, size_t len, struct key_data *key) -{ - DES3_random_to_key(context, key->key, k, len); - - if (key->schedule) { - krb5_free_data(context, key->schedule); - key->schedule = NULL; - } -} - -static krb5_error_code -derive_key(krb5_context context, - struct encryption_type *et, - struct key_data *key, - const 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) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - ret = _krb5_n_fold(constant, len, k, et->blocksize); - if (ret) { - free(k); - krb5_set_error_string(context, "out of memory"); - return ret; - } - for(i = 0; i < nblocks; i++) { - if(i > 0) - memcpy(k + i * et->blocksize, - k + (i - 1) * et->blocksize, - et->blocksize); - (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize, - 1, 0, NULL); - } - } else { - /* this case is probably broken, but won't be run anyway */ - void *c = malloc(len); - size_t res_len = (kt->bits + 7) / 8; - - if(len != 0 && c == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - memcpy(c, constant, len); - (*et->encrypt)(context, key, c, len, 1, 0, NULL); - k = malloc(res_len); - if(res_len != 0 && k == NULL) { - free(c); - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - ret = _krb5_n_fold(c, len, k, res_len); - if (ret) { - free(k); - krb5_set_error_string(context, "out of memory"); - return ret; - } - free(c); - } - - /* XXX keytype dependent post-processing */ - switch(kt->type) { - case KEYTYPE_DES3: - DES3_postproc(context, k, nblocks * et->blocksize, key); - break; - case KEYTYPE_AES128: - case KEYTYPE_AES256: - memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length); - break; - default: - krb5_set_error_string(context, - "derive_key() called with unknown keytype (%u)", - kt->type); - ret = KRB5_CRYPTO_INTERNAL; - break; - } - if (key->schedule) { - krb5_free_data(context, key->schedule); - key->schedule = NULL; - } - 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; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_derive_key(krb5_context context, - const krb5_keyblock *key, - krb5_enctype etype, - const void *constant, - size_t constant_len, - krb5_keyblock **derived_key) -{ - krb5_error_code ret; - struct encryption_type *et; - struct key_data d; - - *derived_key = NULL; - - et = _find_enctype (etype); - if (et == NULL) { - krb5_set_error_string(context, "encryption type %d not supported", - etype); - return KRB5_PROG_ETYPE_NOSUPP; - } - - ret = krb5_copy_keyblock(context, key, &d.key); - if (ret) - return ret; - - d.schedule = NULL; - ret = derive_key(context, et, &d, constant, constant_len); - if (ret == 0) - ret = krb5_copy_keyblock(context, d.key, derived_key); - free_key_data(context, &d); - return ret; -} - -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) { - krb5_set_error_string(context, "malloc: out of memory"); - 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_LIB_FUNCTION -krb5_crypto_init(krb5_context context, - const krb5_keyblock *key, - krb5_enctype etype, - krb5_crypto *crypto) -{ - krb5_error_code ret; - ALLOC(*crypto, 1); - if(*crypto == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - if(etype == ETYPE_NULL) - etype = key->keytype; - (*crypto)->et = _find_enctype(etype); - if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) { - free(*crypto); - *crypto = NULL; - krb5_set_error_string (context, "encryption type %d not supported", - etype); - return KRB5_PROG_ETYPE_NOSUPP; - } - if((*crypto)->et->keytype->size != key->keyvalue.length) { - free(*crypto); - *crypto = NULL; - krb5_set_error_string (context, "encryption key has bad length"); - return KRB5_BAD_KEYSIZE; - } - ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key); - if(ret) { - free(*crypto); - *crypto = NULL; - 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_LIB_FUNCTION -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_LIB_FUNCTION -krb5_crypto_getblocksize(krb5_context context, - krb5_crypto crypto, - size_t *blocksize) -{ - *blocksize = crypto->et->blocksize; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_crypto_getenctype(krb5_context context, - krb5_crypto crypto, - krb5_enctype *enctype) -{ - *enctype = crypto->et->type; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_crypto_getpadsize(krb5_context context, - krb5_crypto crypto, - size_t *padsize) -{ - *padsize = crypto->et->padsize; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_crypto_getconfoundersize(krb5_context context, - krb5_crypto crypto, - size_t *confoundersize) -{ - *confoundersize = crypto->et->confoundersize; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_enctype_disable(krb5_context context, - krb5_enctype enctype) -{ - struct encryption_type *et = _find_enctype(enctype); - if(et == NULL) { - if (context) - krb5_set_error_string (context, "encryption type %d not supported", - enctype); - return KRB5_PROG_ETYPE_NOSUPP; - } - et->flags |= F_DISABLED; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -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; - size_t keylen; - u_char *tmp; - - if(et == NULL) { - krb5_set_error_string (context, "encryption type %d not supported", - etype); - return KRB5_PROG_ETYPE_NOSUPP; - } - keylen = et->keytype->bits / 8; - - ALLOC(kd.key, 1); - if(kd.key == NULL) { - krb5_set_error_string (context, "malloc: out of memory"); - return ENOMEM; - } - ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size); - if(ret) { - free(kd.key); - return ret; - } - kd.key->keytype = etype; - tmp = malloc (keylen); - if(tmp == NULL) { - krb5_free_keyblock(context, kd.key); - krb5_set_error_string (context, "malloc: out of memory"); - return ENOMEM; - } - ret = _krb5_n_fold(str, len, tmp, keylen); - if (ret) { - free(tmp); - krb5_set_error_string(context, "out of memory"); - return ret; - } - kd.schedule = NULL; - DES3_postproc (context, tmp, keylen, &kd); /* XXX */ - memset(tmp, 0, keylen); - free(tmp); - 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; -} - -static size_t -wrapped_length (krb5_context context, - krb5_crypto crypto, - size_t data_len) -{ - struct encryption_type *et = crypto->et; - size_t padsize = et->padsize; - size_t checksumsize = CHECKSUMSIZE(et->checksum); - size_t res; - - res = et->confoundersize + checksumsize + data_len; - res = (res + padsize - 1) / padsize * padsize; - return res; -} - -static size_t -wrapped_length_dervied (krb5_context context, - krb5_crypto crypto, - size_t data_len) -{ - struct encryption_type *et = crypto->et; - size_t padsize = et->padsize; - size_t res; - - res = et->confoundersize + data_len; - res = (res + padsize - 1) / padsize * padsize; - if (et->keyed_checksum) - res += et->keyed_checksum->checksumsize; - else - res += et->checksum->checksumsize; - return res; -} - -/* - * 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) -{ - if (derived_crypto (context, crypto)) - return wrapped_length_dervied (context, crypto, data_len); - else - return wrapped_length (context, crypto, data_len); -} - -/* - * Return the size of an encrypted packet of length `data_len' - */ - -static size_t -crypto_overhead (krb5_context context, - krb5_crypto crypto) -{ - struct encryption_type *et = crypto->et; - size_t res; - - res = CHECKSUMSIZE(et->checksum); - res += et->confoundersize; - if (et->padsize > 1) - res += et->padsize; - return res; -} - -static size_t -crypto_overhead_dervied (krb5_context context, - krb5_crypto crypto) -{ - struct encryption_type *et = crypto->et; - size_t res; - - if (et->keyed_checksum) - res = CHECKSUMSIZE(et->keyed_checksum); - else - res = CHECKSUMSIZE(et->checksum); - res += et->confoundersize; - if (et->padsize > 1) - res += et->padsize; - return res; -} - -size_t -krb5_crypto_overhead (krb5_context context, krb5_crypto crypto) -{ - if (derived_crypto (context, crypto)) - return crypto_overhead_dervied (context, crypto); - else - return crypto_overhead (context, crypto); -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_random_to_key(krb5_context context, - krb5_enctype type, - const void *data, - size_t size, - krb5_keyblock *key) -{ - krb5_error_code ret; - struct encryption_type *et = _find_enctype(type); - if(et == NULL) { - krb5_set_error_string(context, "encryption type %d not supported", - type); - return KRB5_PROG_ETYPE_NOSUPP; - } - if ((et->keytype->bits + 7) / 8 > size) { - krb5_set_error_string(context, "encryption key %s needs %d bytes " - "of random to make an encryption key out of it", - et->name, (int)et->keytype->size); - 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_to_key) - (*et->keytype->random_to_key)(context, key, data, size); - else - memcpy(key->keyvalue.data, data, et->keytype->size); - - return 0; -} - -krb5_error_code -_krb5_pk_octetstring2key(krb5_context context, - krb5_enctype type, - const void *dhdata, - size_t dhsize, - const heim_octet_string *c_n, - const heim_octet_string *k_n, - krb5_keyblock *key) -{ - struct encryption_type *et = _find_enctype(type); - krb5_error_code ret; - size_t keylen, offset; - void *keydata; - unsigned char counter; - unsigned char shaoutput[20]; - - if(et == NULL) { - krb5_set_error_string(context, "encryption type %d not supported", - type); - return KRB5_PROG_ETYPE_NOSUPP; - } - keylen = (et->keytype->bits + 7) / 8; - - keydata = malloc(keylen); - if (keydata == NULL) { - krb5_set_error_string(context, "malloc: out of memory"); - return ENOMEM; - } - - counter = 0; - offset = 0; - do { - SHA_CTX m; - - SHA1_Init(&m); - SHA1_Update(&m, &counter, 1); - SHA1_Update(&m, dhdata, dhsize); - if (c_n) - SHA1_Update(&m, c_n->data, c_n->length); - if (k_n) - SHA1_Update(&m, k_n->data, k_n->length); - SHA1_Final(shaoutput, &m); - - memcpy((unsigned char *)keydata + offset, - shaoutput, - min(keylen - offset, sizeof(shaoutput))); - - offset += sizeof(shaoutput); - counter++; - } while(offset < keylen); - memset(shaoutput, 0, sizeof(shaoutput)); - - ret = krb5_random_to_key(context, type, keydata, keylen, key); - memset(keydata, 0, sizeof(keylen)); - free(keydata); - return ret; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_crypto_prf_length(krb5_context context, - krb5_enctype type, - size_t *length) -{ - struct encryption_type *et = _find_enctype(type); - - if(et == NULL || et->prf_length == 0) { - krb5_set_error_string(context, "encryption type %d not supported", - type); - return KRB5_PROG_ETYPE_NOSUPP; - } - - *length = et->prf_length; - return 0; -} - -krb5_error_code KRB5_LIB_FUNCTION -krb5_crypto_prf(krb5_context context, - const krb5_crypto crypto, - const krb5_data *input, - krb5_data *output) -{ - struct encryption_type *et = crypto->et; - - krb5_data_zero(output); - - if(et->prf == NULL) { - krb5_set_error_string(context, "kerberos prf for %s not supported", - et->name); - return KRB5_PROG_ETYPE_NOSUPP; - } - - return (*et->prf)(context, crypto, input, output); -} - - - - -#ifdef CRYPTO_DEBUG - -static krb5_error_code -krb5_get_keyid(krb5_context context, - krb5_keyblock *key, - uint32_t *keyid) -{ - MD5_CTX md5; - unsigned char tmp[16]; - - MD5_Init (&md5); - MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length); - MD5_Final (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 encryptp, - size_t len, - krb5_keyblock *key) -{ - uint32_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)", - encryptp ? "encrypting" : "decrypting", - (unsigned long)len, - keyid, - kt); - free(kt); -} - -#endif /* CRYPTO_DEBUG */ - -#if 0 -int -main() -{ -#if 0 - int i; - krb5_context context; - krb5_crypto crypto; - struct key_data *d; - krb5_keyblock key; - char constant[4]; - unsigned usage = ENCRYPTION_USAGE(3); - krb5_error_code ret; - - ret = krb5_init_context(&context); - if (ret) - errx (1, "krb5_init_context failed: %d", ret); - - key.keytype = ETYPE_NEW_DES3_CBC_SHA1; - key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8" - "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e" - "\xc8\xdf\xab\x26\x86\x64\x15\x25"; - key.keyvalue.length = 24; - - krb5_crypto_init(context, &key, 0, &crypto); - - d = _new_derived_key(crypto, usage); - if(d == NULL) - krb5_errx(context, 1, "_new_derived_key failed"); - krb5_copy_keyblock(context, crypto->key.key, &d->key); - _krb5_put_int(constant, usage, 4); - derive_key(context, crypto->et, d, constant, sizeof(constant)); - return 0; -#else - int i; - krb5_context context; - krb5_crypto crypto; - struct key_data *d; - krb5_keyblock key; - krb5_error_code ret; - Checksum res; - - char *data = "what do ya want for nothing?"; - - ret = krb5_init_context(&context); - if (ret) - errx (1, "krb5_init_context failed: %d", ret); - - key.keytype = ETYPE_NEW_DES3_CBC_SHA1; - key.keyvalue.data = "Jefe"; - /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b" - "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */ - key.keyvalue.length = 4; - - d = ecalloc(1, sizeof(*d)); - d->key = &key; - res.checksum.length = 20; - res.checksum.data = emalloc(res.checksum.length); - SP_HMAC_SHA1_checksum(context, d, data, 28, &res); - - return 0; -#endif -} -#endif |
