diff options
Diffstat (limited to 'crypto/heimdal/lib/gssapi/krb5/wrap.c')
| -rw-r--r-- | crypto/heimdal/lib/gssapi/krb5/wrap.c | 551 |
1 files changed, 0 insertions, 551 deletions
diff --git a/crypto/heimdal/lib/gssapi/krb5/wrap.c b/crypto/heimdal/lib/gssapi/krb5/wrap.c deleted file mode 100644 index d413798..0000000 --- a/crypto/heimdal/lib/gssapi/krb5/wrap.c +++ /dev/null @@ -1,551 +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 "krb5/gsskrb5_locl.h" - -RCSID("$Id: wrap.c 19035 2006-11-14 09:49:56Z lha $"); - -/* - * Return initiator subkey, or if that doesn't exists, the subkey. - */ - -krb5_error_code -_gsskrb5i_get_initiator_subkey(const gsskrb5_ctx ctx, - krb5_context context, - krb5_keyblock **key) -{ - krb5_error_code ret; - *key = NULL; - - if (ctx->more_flags & LOCAL) { - ret = krb5_auth_con_getlocalsubkey(context, - ctx->auth_context, - key); - } else { - ret = krb5_auth_con_getremotesubkey(context, - ctx->auth_context, - key); - } - if (ret == 0 && *key == NULL) - ret = krb5_auth_con_getkey(context, - ctx->auth_context, - key); - if (ret == 0 && *key == NULL) { - krb5_set_error_string(context, "No initiator subkey available"); - return GSS_KRB5_S_KG_NO_SUBKEY; - } - return ret; -} - -krb5_error_code -_gsskrb5i_get_acceptor_subkey(const gsskrb5_ctx ctx, - krb5_context context, - krb5_keyblock **key) -{ - krb5_error_code ret; - *key = NULL; - - if (ctx->more_flags & LOCAL) { - ret = krb5_auth_con_getremotesubkey(context, - ctx->auth_context, - key); - } else { - ret = krb5_auth_con_getlocalsubkey(context, - ctx->auth_context, - key); - } - if (ret == 0 && *key == NULL) { - krb5_set_error_string(context, "No acceptor subkey available"); - return GSS_KRB5_S_KG_NO_SUBKEY; - } - return ret; -} - -OM_uint32 -_gsskrb5i_get_token_key(const gsskrb5_ctx ctx, - krb5_context context, - krb5_keyblock **key) -{ - _gsskrb5i_get_acceptor_subkey(ctx, context, key); - if(*key == NULL) { - /* - * Only use the initiator subkey or ticket session key if an - * acceptor subkey was not required. - */ - if ((ctx->more_flags & ACCEPTOR_SUBKEY) == 0) - _gsskrb5i_get_initiator_subkey(ctx, context, key); - } - if (*key == NULL) { - krb5_set_error_string(context, "No token key available"); - return GSS_KRB5_S_KG_NO_SUBKEY; - } - return 0; -} - -static OM_uint32 -sub_wrap_size ( - OM_uint32 req_output_size, - OM_uint32 * max_input_size, - int blocksize, - int extrasize - ) -{ - size_t len, total_len; - - len = 8 + req_output_size + blocksize + extrasize; - - _gsskrb5_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM); - - total_len -= req_output_size; /* token length */ - if (total_len < req_output_size) { - *max_input_size = (req_output_size - total_len); - (*max_input_size) &= (~(OM_uint32)(blocksize - 1)); - } else { - *max_input_size = 0; - } - return GSS_S_COMPLETE; -} - -OM_uint32 -_gsskrb5_wrap_size_limit ( - OM_uint32 * minor_status, - const gss_ctx_id_t context_handle, - int conf_req_flag, - gss_qop_t qop_req, - OM_uint32 req_output_size, - OM_uint32 * max_input_size - ) -{ - krb5_context context; - krb5_keyblock *key; - OM_uint32 ret; - krb5_keytype keytype; - const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle; - - GSSAPI_KRB5_INIT (&context); - - HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); - ret = _gsskrb5i_get_token_key(ctx, context, &key); - HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); - if (ret) { - *minor_status = ret; - return GSS_S_FAILURE; - } - krb5_enctype_to_keytype (context, key->keytype, &keytype); - - switch (keytype) { - case KEYTYPE_DES : - ret = sub_wrap_size(req_output_size, max_input_size, 8, 22); - break; - case KEYTYPE_ARCFOUR: - case KEYTYPE_ARCFOUR_56: - ret = _gssapi_wrap_size_arcfour(minor_status, ctx, context, - conf_req_flag, qop_req, - req_output_size, max_input_size, key); - break; - case KEYTYPE_DES3 : - ret = sub_wrap_size(req_output_size, max_input_size, 8, 34); - break; - default : - ret = _gssapi_wrap_size_cfx(minor_status, ctx, context, - conf_req_flag, qop_req, - req_output_size, max_input_size, key); - break; - } - krb5_free_keyblock (context, key); - *minor_status = 0; - return ret; -} - -static OM_uint32 -wrap_des - (OM_uint32 * minor_status, - const gsskrb5_ctx ctx, - krb5_context context, - int conf_req_flag, - gss_qop_t qop_req, - const gss_buffer_t input_message_buffer, - int * conf_state, - gss_buffer_t output_message_buffer, - krb5_keyblock *key - ) -{ - u_char *p; - MD5_CTX md5; - u_char hash[16]; - DES_key_schedule schedule; - DES_cblock deskey; - DES_cblock zero; - int i; - int32_t seq_number; - size_t len, total_len, padlength, datalen; - - padlength = 8 - (input_message_buffer->length % 8); - datalen = input_message_buffer->length + padlength + 8; - len = datalen + 22; - _gsskrb5_encap_length (len, &len, &total_len, GSS_KRB5_MECHANISM); - - output_message_buffer->length = total_len; - output_message_buffer->value = malloc (total_len); - if (output_message_buffer->value == NULL) { - output_message_buffer->length = 0; - *minor_status = ENOMEM; - return GSS_S_FAILURE; - } - - p = _gsskrb5_make_header(output_message_buffer->value, - len, - "\x02\x01", /* TOK_ID */ - GSS_KRB5_MECHANISM); - - /* SGN_ALG */ - memcpy (p, "\x00\x00", 2); - p += 2; - /* SEAL_ALG */ - if(conf_req_flag) - memcpy (p, "\x00\x00", 2); - else - memcpy (p, "\xff\xff", 2); - p += 2; - /* Filler */ - memcpy (p, "\xff\xff", 2); - p += 2; - - /* fill in later */ - memset (p, 0, 16); - p += 16; - - /* confounder + data + pad */ - krb5_generate_random_block(p, 8); - memcpy (p + 8, input_message_buffer->value, - input_message_buffer->length); - memset (p + 8 + input_message_buffer->length, padlength, padlength); - - /* checksum */ - MD5_Init (&md5); - MD5_Update (&md5, p - 24, 8); - MD5_Update (&md5, p, datalen); - 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); - memcpy (p - 8, hash, 8); - - /* sequence number */ - HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); - krb5_auth_con_getlocalseqnumber (context, - ctx->auth_context, - &seq_number); - - p -= 16; - p[0] = (seq_number >> 0) & 0xFF; - p[1] = (seq_number >> 8) & 0xFF; - p[2] = (seq_number >> 16) & 0xFF; - p[3] = (seq_number >> 24) & 0xFF; - memset (p + 4, - (ctx->more_flags & LOCAL) ? 0 : 0xFF, - 4); - - DES_set_key (&deskey, &schedule); - DES_cbc_encrypt ((void *)p, (void *)p, 8, - &schedule, (DES_cblock *)(p + 8), DES_ENCRYPT); - - krb5_auth_con_setlocalseqnumber (context, - ctx->auth_context, - ++seq_number); - HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); - - /* encrypt the data */ - p += 16; - - if(conf_req_flag) { - 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, - datalen, - &schedule, - &zero, - DES_ENCRYPT); - } - memset (deskey, 0, sizeof(deskey)); - memset (&schedule, 0, sizeof(schedule)); - - if(conf_state != NULL) - *conf_state = conf_req_flag; - *minor_status = 0; - return GSS_S_COMPLETE; -} - -static OM_uint32 -wrap_des3 - (OM_uint32 * minor_status, - const gsskrb5_ctx ctx, - krb5_context context, - int conf_req_flag, - gss_qop_t qop_req, - const gss_buffer_t input_message_buffer, - int * conf_state, - gss_buffer_t output_message_buffer, - krb5_keyblock *key - ) -{ - u_char *p; - u_char seq[8]; - int32_t seq_number; - size_t len, total_len, padlength, datalen; - uint32_t ret; - krb5_crypto crypto; - Checksum cksum; - krb5_data encdata; - - padlength = 8 - (input_message_buffer->length % 8); - datalen = input_message_buffer->length + padlength + 8; - len = datalen + 34; - _gsskrb5_encap_length (len, &len, &total_len, GSS_KRB5_MECHANISM); - - output_message_buffer->length = total_len; - output_message_buffer->value = malloc (total_len); - if (output_message_buffer->value == NULL) { - output_message_buffer->length = 0; - *minor_status = ENOMEM; - return GSS_S_FAILURE; - } - - p = _gsskrb5_make_header(output_message_buffer->value, - len, - "\x02\x01", /* TOK_ID */ - GSS_KRB5_MECHANISM); - - /* SGN_ALG */ - memcpy (p, "\x04\x00", 2); /* HMAC SHA1 DES3-KD */ - p += 2; - /* SEAL_ALG */ - if(conf_req_flag) - memcpy (p, "\x02\x00", 2); /* DES3-KD */ - else - memcpy (p, "\xff\xff", 2); - p += 2; - /* Filler */ - memcpy (p, "\xff\xff", 2); - p += 2; - - /* calculate checksum (the above + confounder + data + pad) */ - - memcpy (p + 20, p - 8, 8); - krb5_generate_random_block(p + 28, 8); - memcpy (p + 28 + 8, input_message_buffer->value, - input_message_buffer->length); - memset (p + 28 + 8 + input_message_buffer->length, padlength, padlength); - - ret = krb5_crypto_init(context, key, 0, &crypto); - if (ret) { - free (output_message_buffer->value); - output_message_buffer->length = 0; - output_message_buffer->value = NULL; - *minor_status = ret; - return GSS_S_FAILURE; - } - - ret = krb5_create_checksum (context, - crypto, - KRB5_KU_USAGE_SIGN, - 0, - p + 20, - datalen + 8, - &cksum); - krb5_crypto_destroy (context, crypto); - if (ret) { - free (output_message_buffer->value); - output_message_buffer->length = 0; - output_message_buffer->value = NULL; - *minor_status = ret; - return GSS_S_FAILURE; - } - - /* zero out SND_SEQ + SGN_CKSUM in case */ - memset (p, 0, 28); - - memcpy (p + 8, cksum.checksum.data, cksum.checksum.length); - free_Checksum (&cksum); - - HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); - /* sequence number */ - krb5_auth_con_getlocalseqnumber (context, - ctx->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, - (ctx->more_flags & LOCAL) ? 0 : 0xFF, - 4); - - - ret = krb5_crypto_init(context, key, ETYPE_DES3_CBC_NONE, - &crypto); - if (ret) { - free (output_message_buffer->value); - output_message_buffer->length = 0; - output_message_buffer->value = NULL; - *minor_status = ret; - return GSS_S_FAILURE; - } - - { - DES_cblock ivec; - - memcpy (&ivec, p + 8, 8); - ret = krb5_encrypt_ivec (context, - crypto, - KRB5_KU_USAGE_SEQ, - seq, 8, &encdata, - &ivec); - } - krb5_crypto_destroy (context, crypto); - if (ret) { - free (output_message_buffer->value); - output_message_buffer->length = 0; - output_message_buffer->value = NULL; - *minor_status = ret; - return GSS_S_FAILURE; - } - - assert (encdata.length == 8); - - memcpy (p, encdata.data, encdata.length); - krb5_data_free (&encdata); - - krb5_auth_con_setlocalseqnumber (context, - ctx->auth_context, - ++seq_number); - HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); - - /* encrypt the data */ - p += 28; - - if(conf_req_flag) { - krb5_data tmp; - - ret = krb5_crypto_init(context, key, - ETYPE_DES3_CBC_NONE, &crypto); - if (ret) { - free (output_message_buffer->value); - output_message_buffer->length = 0; - output_message_buffer->value = NULL; - *minor_status = ret; - return GSS_S_FAILURE; - } - ret = krb5_encrypt(context, crypto, KRB5_KU_USAGE_SEAL, - p, datalen, &tmp); - krb5_crypto_destroy(context, crypto); - if (ret) { - free (output_message_buffer->value); - output_message_buffer->length = 0; - output_message_buffer->value = NULL; - *minor_status = ret; - return GSS_S_FAILURE; - } - assert (tmp.length == datalen); - - memcpy (p, tmp.data, datalen); - krb5_data_free(&tmp); - } - if(conf_state != NULL) - *conf_state = conf_req_flag; - *minor_status = 0; - return GSS_S_COMPLETE; -} - -OM_uint32 _gsskrb5_wrap - (OM_uint32 * minor_status, - const gss_ctx_id_t context_handle, - int conf_req_flag, - gss_qop_t qop_req, - const gss_buffer_t input_message_buffer, - int * conf_state, - gss_buffer_t output_message_buffer - ) -{ - krb5_context context; - krb5_keyblock *key; - OM_uint32 ret; - krb5_keytype keytype; - const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle; - - GSSAPI_KRB5_INIT (&context); - - HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); - ret = _gsskrb5i_get_token_key(ctx, context, &key); - HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); - if (ret) { - *minor_status = ret; - return GSS_S_FAILURE; - } - krb5_enctype_to_keytype (context, key->keytype, &keytype); - - switch (keytype) { - case KEYTYPE_DES : - ret = wrap_des (minor_status, ctx, context, conf_req_flag, - qop_req, input_message_buffer, conf_state, - output_message_buffer, key); - break; - case KEYTYPE_DES3 : - ret = wrap_des3 (minor_status, ctx, context, conf_req_flag, - qop_req, input_message_buffer, conf_state, - output_message_buffer, key); - break; - case KEYTYPE_ARCFOUR: - case KEYTYPE_ARCFOUR_56: - ret = _gssapi_wrap_arcfour (minor_status, ctx, context, conf_req_flag, - qop_req, input_message_buffer, conf_state, - output_message_buffer, key); - break; - default : - ret = _gssapi_wrap_cfx (minor_status, ctx, context, conf_req_flag, - qop_req, input_message_buffer, conf_state, - output_message_buffer, key); - break; - } - krb5_free_keyblock (context, key); - return ret; -} |
