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Add sequence number.

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1916 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
1997-06-16 03:45:10 +00:00
parent 42cf5db058
commit 18d72f2bd9
4 changed files with 128 additions and 14 deletions
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39
lib/gssapi/verify_mic.c
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@@ -1,6 +1,4 @@
#include "gssapi_locl.h"
#include <des.h>
#include <md5.h>
RCSID("$Id$");
@@ -15,10 +13,11 @@ OM_uint32 gss_verify_mic
u_char *p;
size_t len;
struct md5 md5;
u_char hash[16];
u_char hash[16], seq_data[8];
des_key_schedule schedule;
des_cblock key;
des_cblock zero;
int32_t seq_number;
p = token_buffer->value;
len = GSS_KRB5_MECHANISM->length + 28;
@@ -40,6 +39,7 @@ OM_uint32 gss_verify_mic
p += 4;
p += 16;
/* verify checksum */
md5_init (&md5);
md5_update (&md5, p - 24, 8);
md5_update (&md5, message_buffer->value,
@@ -52,8 +52,39 @@ OM_uint32 gss_verify_mic
des_set_key (&key, schedule);
des_cbc_cksum ((des_cblock *)hash,
(des_cblock *)hash, sizeof(hash), schedule, &zero);
if (memcmp (p - 8, hash, 8) != 0)
if (memcmp (p - 8, hash, 8) != 0) {
memset (key, 0, sizeof(key));
memset (schedule, 0, sizeof(schedule));
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) ? 0 : 0xFF,
4);
p -= 16;
des_set_key (&key, schedule);
des_cbc_encrypt (p, p, 8, schedule, hash, DES_DECRYPT);
memset (key, 0, sizeof(key));
memset (schedule, 0, sizeof(schedule));
if (memcmp (p, seq_data, 8) != 0) {
return GSS_S_BAD_MIC;
}
krb5_auth_setremoteseqnumber (gssapi_krb5_context,
context_handle->auth_context,
++seq_number);
return GSS_S_COMPLETE;
}