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Diffstat (limited to 'source4/heimdal/lib/krb5/salt-des.c')
| -rw-r--r-- | source4/heimdal/lib/krb5/salt-des.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/source4/heimdal/lib/krb5/salt-des.c b/source4/heimdal/lib/krb5/salt-des.c new file mode 100644 index 0000000000..6939b6b50b --- /dev/null +++ b/source4/heimdal/lib/krb5/salt-des.c @@ -0,0 +1,224 @@ +/* + * Copyright (c) 1997 - 2008 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" + +#ifdef HEIM_WEAK_CRYPTO + +#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_unchecked (&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_unchecked (&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_unchecked(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_message(context, ENOMEM, N_("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; +} + +struct salt_type _krb5_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 } +}; +#endif |