diff options
Diffstat (limited to 'crypto/heimdal/lib/gssapi/unwrap.c')
| -rw-r--r-- | crypto/heimdal/lib/gssapi/unwrap.c | 422 |
1 files changed, 0 insertions, 422 deletions
diff --git a/crypto/heimdal/lib/gssapi/unwrap.c b/crypto/heimdal/lib/gssapi/unwrap.c deleted file mode 100644 index b798438..0000000 --- a/crypto/heimdal/lib/gssapi/unwrap.c +++ /dev/null @@ -1,422 +0,0 @@ -/* - * Copyright (c) 1997 - 2003 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 "gssapi_locl.h" - -RCSID("$Id: unwrap.c,v 1.22.2.1 2003/09/18 22:05:22 lha Exp $"); - -OM_uint32 -gss_krb5_get_remotekey(const gss_ctx_id_t context_handle, - krb5_keyblock **key) -{ - krb5_keyblock *skey; - - krb5_auth_con_getremotesubkey(gssapi_krb5_context, - context_handle->auth_context, - &skey); - if(skey == NULL) - krb5_auth_con_getlocalsubkey(gssapi_krb5_context, - context_handle->auth_context, - &skey); - if(skey == NULL) - krb5_auth_con_getkey(gssapi_krb5_context, - context_handle->auth_context, - &skey); - if(skey == NULL) - return GSS_KRB5_S_KG_NO_SUBKEY; /* XXX */ - *key = skey; - return 0; -} - -static OM_uint32 -unwrap_des - (OM_uint32 * minor_status, - const gss_ctx_id_t context_handle, - const gss_buffer_t input_message_buffer, - gss_buffer_t output_message_buffer, - int * conf_state, - gss_qop_t * qop_state, - krb5_keyblock *key - ) -{ - u_char *p, *pad; - size_t len; - MD5_CTX md5; - u_char hash[16], seq_data[8]; - des_key_schedule schedule; - des_cblock deskey; - des_cblock zero; - int i; - int32_t seq_number; - size_t padlength; - OM_uint32 ret; - int cstate; - - p = input_message_buffer->value; - ret = gssapi_krb5_verify_header (&p, - input_message_buffer->length, - "\x02\x01"); - if (ret) - return ret; - - if (memcmp (p, "\x00\x00", 2) != 0) - return GSS_S_BAD_SIG; - p += 2; - if (memcmp (p, "\x00\x00", 2) == 0) { - cstate = 1; - } else if (memcmp (p, "\xFF\xFF", 2) == 0) { - cstate = 0; - } else - return GSS_S_BAD_MIC; - p += 2; - if(conf_state != NULL) - *conf_state = cstate; - if (memcmp (p, "\xff\xff", 2) != 0) - return GSS_S_DEFECTIVE_TOKEN; - p += 2; - p += 16; - - len = p - (u_char *)input_message_buffer->value; - - if(cstate) { - /* decrypt data */ - memcpy (&deskey, key->keyvalue.data, sizeof(deskey)); - - for (i = 0; i < sizeof(deskey); ++i) - deskey[i] ^= 0xf0; - des_set_key (&deskey, schedule); - memset (&zero, 0, sizeof(zero)); - des_cbc_encrypt ((void *)p, - (void *)p, - input_message_buffer->length - len, - schedule, - &zero, - DES_DECRYPT); - - memset (deskey, 0, sizeof(deskey)); - memset (schedule, 0, sizeof(schedule)); - } - /* check pad */ - - pad = (u_char *)input_message_buffer->value + input_message_buffer->length - 1; - padlength = *pad; - - for (i = padlength; i > 0 && *pad == padlength; i--, pad--) - ; - if (i != 0) - return GSS_S_BAD_MIC; - - MD5_Init (&md5); - MD5_Update (&md5, p - 24, 8); - MD5_Update (&md5, p, input_message_buffer->length - len); - MD5_Final (hash, &md5); - - memset (&zero, 0, sizeof(zero)); - memcpy (&deskey, key->keyvalue.data, sizeof(deskey)); - des_set_key (&deskey, schedule); - des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash), - schedule, &zero); - if (memcmp (p - 8, hash, 8) != 0) - return GSS_S_BAD_MIC; - - /* verify sequence number */ - - krb5_auth_getremoteseqnumber (gssapi_krb5_context, - context_handle->auth_context, - &seq_number); - seq_data[0] = (seq_number >> 0) & 0xFF; - seq_data[1] = (seq_number >> 8) & 0xFF; - seq_data[2] = (seq_number >> 16) & 0xFF; - seq_data[3] = (seq_number >> 24) & 0xFF; - memset (seq_data + 4, - (context_handle->more_flags & LOCAL) ? 0xFF : 0, - 4); - - p -= 16; - des_set_key (&deskey, schedule); - des_cbc_encrypt ((void *)p, (void *)p, 8, - schedule, (des_cblock *)hash, DES_DECRYPT); - - memset (deskey, 0, sizeof(deskey)); - memset (schedule, 0, sizeof(schedule)); - - if (memcmp (p, seq_data, 8) != 0) { - return GSS_S_BAD_MIC; - } - - krb5_auth_con_setremoteseqnumber (gssapi_krb5_context, - context_handle->auth_context, - ++seq_number); - - /* copy out data */ - - output_message_buffer->length = input_message_buffer->length - - len - padlength - 8; - output_message_buffer->value = malloc(output_message_buffer->length); - if(output_message_buffer->length != 0 && output_message_buffer->value == NULL) - return GSS_S_FAILURE; - memcpy (output_message_buffer->value, - p + 24, - output_message_buffer->length); - return GSS_S_COMPLETE; -} - -static OM_uint32 -unwrap_des3 - (OM_uint32 * minor_status, - const gss_ctx_id_t context_handle, - const gss_buffer_t input_message_buffer, - gss_buffer_t output_message_buffer, - int * conf_state, - gss_qop_t * qop_state, - krb5_keyblock *key - ) -{ - u_char *p, *pad; - size_t len; - u_char seq[8]; - krb5_data seq_data; - u_char cksum[20]; - int i; - int32_t seq_number; - size_t padlength; - OM_uint32 ret; - int cstate; - krb5_crypto crypto; - Checksum csum; - int cmp; - - p = input_message_buffer->value; - ret = gssapi_krb5_verify_header (&p, - input_message_buffer->length, - "\x02\x01"); - if (ret) - return ret; - - if (memcmp (p, "\x04\x00", 2) != 0) /* HMAC SHA1 DES3_KD */ - return GSS_S_BAD_SIG; - p += 2; - if (memcmp (p, "\x02\x00", 2) == 0) { - cstate = 1; - } else if (memcmp (p, "\xff\xff", 2) == 0) { - cstate = 0; - } else - return GSS_S_BAD_MIC; - p += 2; - if(conf_state != NULL) - *conf_state = cstate; - if (memcmp (p, "\xff\xff", 2) != 0) - return GSS_S_DEFECTIVE_TOKEN; - p += 2; - p += 28; - - len = p - (u_char *)input_message_buffer->value; - - if(cstate) { - /* decrypt data */ - krb5_data tmp; - - ret = krb5_crypto_init(gssapi_krb5_context, key, - ETYPE_DES3_CBC_NONE, &crypto); - if (ret) { - gssapi_krb5_set_error_string (); - *minor_status = ret; - return GSS_S_FAILURE; - } - ret = krb5_decrypt(gssapi_krb5_context, crypto, KRB5_KU_USAGE_SEAL, - p, input_message_buffer->length - len, &tmp); - krb5_crypto_destroy(gssapi_krb5_context, crypto); - if (ret) { - gssapi_krb5_set_error_string (); - *minor_status = ret; - return GSS_S_FAILURE; - } - assert (tmp.length == input_message_buffer->length - len); - - memcpy (p, tmp.data, tmp.length); - krb5_data_free(&tmp); - } - /* check pad */ - - pad = (u_char *)input_message_buffer->value + input_message_buffer->length - 1; - padlength = *pad; - - for (i = padlength; i > 0 && *pad == padlength; i--, pad--) - ; - if (i != 0) - return GSS_S_BAD_MIC; - - /* verify sequence number */ - - krb5_auth_getremoteseqnumber (gssapi_krb5_context, - context_handle->auth_context, - &seq_number); - seq[0] = (seq_number >> 0) & 0xFF; - seq[1] = (seq_number >> 8) & 0xFF; - seq[2] = (seq_number >> 16) & 0xFF; - seq[3] = (seq_number >> 24) & 0xFF; - memset (seq + 4, - (context_handle->more_flags & LOCAL) ? 0xFF : 0, - 4); - - p -= 28; - - ret = krb5_crypto_init(gssapi_krb5_context, key, - ETYPE_DES3_CBC_NONE, &crypto); - if (ret) { - gssapi_krb5_set_error_string (); - *minor_status = ret; - return GSS_S_FAILURE; - } - { - des_cblock ivec; - - memcpy(&ivec, p + 8, 8); - ret = krb5_decrypt_ivec (gssapi_krb5_context, - crypto, - KRB5_KU_USAGE_SEQ, - p, 8, &seq_data, - &ivec); - } - krb5_crypto_destroy (gssapi_krb5_context, crypto); - if (ret) { - gssapi_krb5_set_error_string (); - *minor_status = ret; - return GSS_S_FAILURE; - } - if (seq_data.length != 8) { - krb5_data_free (&seq_data); - return GSS_S_BAD_MIC; - } - - cmp = memcmp (seq, seq_data.data, seq_data.length); - krb5_data_free (&seq_data); - if (cmp != 0) { - return GSS_S_BAD_MIC; - } - - krb5_auth_con_setremoteseqnumber (gssapi_krb5_context, - context_handle->auth_context, - ++seq_number); - - /* verify checksum */ - - memcpy (cksum, p + 8, 20); - - memcpy (p + 20, p - 8, 8); - - csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3; - csum.checksum.length = 20; - csum.checksum.data = cksum; - - ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto); - if (ret) { - gssapi_krb5_set_error_string (); - *minor_status = ret; - return GSS_S_FAILURE; - } - - ret = krb5_verify_checksum (gssapi_krb5_context, crypto, - KRB5_KU_USAGE_SIGN, - p + 20, - input_message_buffer->length - len + 8, - &csum); - krb5_crypto_destroy (gssapi_krb5_context, crypto); - if (ret) { - gssapi_krb5_set_error_string (); - *minor_status = ret; - return GSS_S_FAILURE; - } - - /* copy out data */ - - output_message_buffer->length = input_message_buffer->length - - len - padlength - 8; - output_message_buffer->value = malloc(output_message_buffer->length); - if(output_message_buffer->length != 0 && output_message_buffer->value == NULL) - return GSS_S_FAILURE; - memcpy (output_message_buffer->value, - p + 36, - output_message_buffer->length); - return GSS_S_COMPLETE; -} - -OM_uint32 gss_unwrap - (OM_uint32 * minor_status, - const gss_ctx_id_t context_handle, - const gss_buffer_t input_message_buffer, - gss_buffer_t output_message_buffer, - int * conf_state, - gss_qop_t * qop_state - ) -{ - krb5_keyblock *key; - OM_uint32 ret; - krb5_keytype keytype; - - if (qop_state != NULL) - *qop_state = GSS_C_QOP_DEFAULT; - ret = gss_krb5_get_remotekey(context_handle, &key); - if (ret) { - gssapi_krb5_set_error_string (); - *minor_status = ret; - return GSS_S_FAILURE; - } - krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype); - - *minor_status = 0; - - switch (keytype) { - case KEYTYPE_DES : - ret = unwrap_des (minor_status, context_handle, - input_message_buffer, output_message_buffer, - conf_state, qop_state, key); - break; - case KEYTYPE_DES3 : - ret = unwrap_des3 (minor_status, context_handle, - input_message_buffer, output_message_buffer, - conf_state, qop_state, key); - break; - case KEYTYPE_ARCFOUR: - ret = _gssapi_unwrap_arcfour (minor_status, context_handle, - input_message_buffer, output_message_buffer, - conf_state, qop_state, key); - break; - default : - *minor_status = KRB5_PROG_ETYPE_NOSUPP; - ret = GSS_S_FAILURE; - break; - } - krb5_free_keyblock (gssapi_krb5_context, key); - return ret; -} |
