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(gssapi_krb5_verify_8003_checksum): check size of input

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@11532 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Johan Danielsson
2002-10-31 14:38:49 +00:00
parent 820be02837
commit c70d871a1b
2 changed files with 130 additions and 118 deletions
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124
lib/gssapi/krb5/8003.c
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@@ -100,56 +100,56 @@ gssapi_krb5_create_8003_checksum (
const krb5_data *fwd_data,
Checksum *result)
{
u_char *p;
u_char *p;
/*
* see rfc1964 (section 1.1.1 (Initial Token), and the checksum value
* field's format) */
result->cksumtype = 0x8003;
if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG))
result->checksum.length = 24 + 4 + fwd_data->length;
else
result->checksum.length = 24;
result->checksum.data = malloc (result->checksum.length);
if (result->checksum.data == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
/*
* see rfc1964 (section 1.1.1 (Initial Token), and the checksum value
* field's format) */
result->cksumtype = 0x8003;
if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG))
result->checksum.length = 24 + 4 + fwd_data->length;
else
result->checksum.length = 24;
result->checksum.data = malloc (result->checksum.length);
if (result->checksum.data == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
p = result->checksum.data;
encode_om_uint32 (16, p);
p += 4;
if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS) {
memset (p, 0, 16);
} else {
hash_input_chan_bindings (input_chan_bindings, p);
}
p += 16;
encode_om_uint32 (flags, p);
p += 4;
p = result->checksum.data;
encode_om_uint32 (16, p);
p += 4;
if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS) {
memset (p, 0, 16);
} else {
hash_input_chan_bindings (input_chan_bindings, p);
}
p += 16;
encode_om_uint32 (flags, p);
p += 4;
if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG)) {
if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG)) {
#if 0
u_char *tmp;
u_char *tmp;
result->checksum.length = 28 + fwd_data->length;
tmp = realloc(result->checksum.data, result->checksum.length);
if (tmp == NULL)
return ENOMEM;
result->checksum.data = tmp;
result->checksum.length = 28 + fwd_data->length;
tmp = realloc(result->checksum.data, result->checksum.length);
if (tmp == NULL)
return ENOMEM;
result->checksum.data = tmp;
p = (u_char*)result->checksum.data + 24;
p = (u_char*)result->checksum.data + 24;
#endif
*p++ = (1 >> 0) & 0xFF; /* DlgOpt */ /* == 1 */
*p++ = (1 >> 8) & 0xFF; /* DlgOpt */ /* == 0 */
*p++ = (fwd_data->length >> 0) & 0xFF; /* Dlgth */
*p++ = (fwd_data->length >> 8) & 0xFF; /* Dlgth */
memcpy(p, (unsigned char *) fwd_data->data, fwd_data->length);
*p++ = (1 >> 0) & 0xFF; /* DlgOpt */ /* == 1 */
*p++ = (1 >> 8) & 0xFF; /* DlgOpt */ /* == 0 */
*p++ = (fwd_data->length >> 0) & 0xFF; /* Dlgth */
*p++ = (fwd_data->length >> 8) & 0xFF; /* Dlgth */
memcpy(p, (unsigned char *) fwd_data->data, fwd_data->length);
p += fwd_data->length;
}
p += fwd_data->length;
}
return GSS_S_COMPLETE;
return GSS_S_COMPLETE;
}
/*
@@ -172,7 +172,7 @@ gssapi_krb5_verify_8003_checksum(
static unsigned char zeros[16];
/* XXX should handle checksums > 24 bytes */
if(cksum->cksumtype != 0x8003) {
if(cksum->cksumtype != 0x8003 || cksum->checksum.length < 24) {
*minor_status = 0;
return GSS_S_BAD_BINDINGS;
}
@@ -201,27 +201,33 @@ gssapi_krb5_verify_8003_checksum(
p += sizeof(hash);
decode_om_uint32(p, flags);
p += 4;
if (cksum->checksum.length > 24 && (*flags & GSS_C_DELEG_FLAG)) {
if(cksum->checksum.length < 28) {
*minor_status = 0;
return GSS_S_BAD_BINDINGS;
}
p += 4;
DlgOpt = (p[0] << 0) | (p[1] << 8 );
if (DlgOpt != 1) {
*minor_status = 0;
return GSS_S_BAD_BINDINGS;
}
p += 2;
fwd_data->length = (p[0] << 0) | (p[1] << 8);
fwd_data->data = malloc(fwd_data->length);
if (fwd_data->data == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
DlgOpt = (p[0] << 0) | (p[1] << 8);
p += 2;
if (DlgOpt != 1) {
*minor_status = 0;
return GSS_S_BAD_BINDINGS;
}
p += 2;
memcpy(fwd_data->data, p, fwd_data->length);
fwd_data->length = (p[0] << 0) | (p[1] << 8);
p += 2;
if(cksum->checksum.length < 28 + fwd_data->length) {
*minor_status = 0;
return GSS_S_BAD_BINDINGS;
}
fwd_data->data = malloc(fwd_data->length);
if (fwd_data->data == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
memcpy(fwd_data->data, p, fwd_data->length);
}
return GSS_S_COMPLETE;