420b334bba
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1935 ec53bebd-3082-4978-b11e-865c3cabbd6b
120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
#include "gssapi_locl.h"
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RCSID("$Id$");
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OM_uint32 gss_wrap
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(OM_uint32 * minor_status,
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const gss_ctx_id_t context_handle,
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int conf_req_flag,
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gss_qop_t qop_req,
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const gss_buffer_t input_message_buffer,
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int * conf_state,
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gss_buffer_t output_message_buffer
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)
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{
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u_char *p;
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size_t len;
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struct md5 md5;
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u_char hash[16];
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des_key_schedule schedule;
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des_cblock key;
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des_cblock zero;
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size_t padlength;
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int i;
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int32_t seq_number;
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padlength = 8 - (input_message_buffer->length % 8);
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len = input_message_buffer->length + 8 + padlength + 28
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+ GSS_KRB5_MECHANISM->length;
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output_message_buffer->length = len;
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output_message_buffer->value = malloc (len);
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if (output_message_buffer->value == NULL)
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return GSS_S_FAILURE;
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p = output_message_buffer->value;
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memcpy (p, "\x60\x07\x06\x05", 4);
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p += 4;
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memcpy (p, GSS_KRB5_MECHANISM->elements, GSS_KRB5_MECHANISM->length);
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p += GSS_KRB5_MECHANISM->length;
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/* TOK_ID */
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memcpy (p, "\x02\x01", 2);
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p += 2;
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/* SGN_ALG */
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memcpy (p, "\x00\x00", 2);
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p += 2;
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/* SEAL_ALG */
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memcpy (p, "\x00\x00", 2);
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p += 2;
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/* Filler */
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memcpy (p, "\xff\xff", 2);
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p += 2;
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/* fill in later */
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memset (p, 0, 16);
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p += 16;
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/* confounder + data + pad */
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des_new_random_key((des_cblock*)p);
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memcpy (p + 8, input_message_buffer->value,
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input_message_buffer->length);
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memset (p + 8 + input_message_buffer->length, padlength, padlength);
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/* checksum */
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md5_init (&md5);
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md5_update (&md5, p - 24, 8);
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md5_update (&md5, p + 8, input_message_buffer->length + padlength);
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md5_finito (&md5, hash);
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memset (&zero, 0, sizeof(zero));
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memcpy (&key, context_handle->auth_context->key.keyvalue.data,
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sizeof(key));
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des_set_key (&key, schedule);
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des_cbc_cksum ((des_cblock *)hash,
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(des_cblock *)hash, sizeof(hash), schedule, &zero);
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memcpy (p - 8, hash, 8);
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/* sequence number */
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krb5_auth_getlocalseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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&seq_number);
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p -= 16;
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p[0] = (seq_number >> 0) & 0xFF;
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p[1] = (seq_number >> 8) & 0xFF;
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p[2] = (seq_number >> 16) & 0xFF;
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p[3] = (seq_number >> 24) & 0xFF;
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memset (p + 4,
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(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
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4);
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des_set_key (&key, schedule);
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des_cbc_encrypt ((des_cblock *)p, (des_cblock *)p, 8,
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schedule, (des_cblock *)(p + 16), DES_ENCRYPT);
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krb5_auth_setlocalseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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++seq_number);
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/* encrypt the data */
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p += 16;
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memset (&zero, 0, sizeof(zero));
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memcpy (&key, context_handle->auth_context->key.keyvalue.data,
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sizeof(key));
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for (i = 0; i < sizeof(key); ++i)
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key[i] ^= 0xf0;
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des_set_key (&key, schedule);
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des_cbc_encrypt ((des_cblock *)p,
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(des_cblock *)p,
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8 + input_message_buffer->length + padlength,
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schedule,
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&zero,
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DES_ENCRYPT);
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memset (key, 0, sizeof(key));
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memset (schedule, 0, sizeof(schedule));
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return GSS_S_COMPLETE;
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}
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