#define CFXAcceptorSubkey (1 << 2)
krb5_error_code
-_gsskrb5cfx_wrap_length_cfx(const gsskrb5_ctx context_handle,
- krb5_context context,
+_gsskrb5cfx_wrap_length_cfx(krb5_context context,
krb5_crypto crypto,
int conf_req_flag,
+ int dce_style,
size_t input_length,
size_t *output_length,
size_t *cksumsize,
/* Header is concatenated with data before encryption */
input_length += sizeof(gss_cfx_wrap_token_desc);
- if (IS_DCE_STYLE(context_handle)) {
+ if (dce_style) {
ret = krb5_crypto_getblocksize(context, crypto, &padsize);
} else {
ret = krb5_crypto_getpadsize(context, crypto, &padsize);
return NULL;
}
-static OM_uint32
-allocate_buffer(OM_uint32 *minor_status, gss_iov_buffer_desc *buffer, size_t size)
+OM_uint32
+_gk_allocate_buffer(OM_uint32 *minor_status, gss_iov_buffer_desc *buffer, size_t size)
{
if (buffer->type & GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATED) {
if (buffer->buffer.length == size)
}
+OM_uint32
+_gk_verify_buffers(OM_uint32 *minor_status,
+ const gsskrb5_ctx ctx,
+ const gss_iov_buffer_desc *header,
+ const gss_iov_buffer_desc *padding,
+ const gss_iov_buffer_desc *trailer)
+{
+ if (header == NULL) {
+ *minor_status = EINVAL;
+ return GSS_S_FAILURE;
+ }
+
+ if (IS_DCE_STYLE(ctx)) {
+ /*
+ * In DCE style mode we reject having a padding or trailer buffer
+ */
+ if (padding) {
+ *minor_status = EINVAL;
+ return GSS_S_FAILURE;
+ }
+ if (trailer) {
+ *minor_status = EINVAL;
+ return GSS_S_FAILURE;
+ }
+ } else {
+ /*
+ * In non-DCE style mode we require having a padding buffer
+ */
+ if (padding == NULL) {
+ *minor_status = EINVAL;
+ return GSS_S_FAILURE;
+ }
+ }
+
+ *minor_status = 0;
+ return GSS_S_COMPLETE;
+}
OM_uint32
_gssapi_wrap_cfx_iov(OM_uint32 *minor_status,
gss_iov_buffer_desc *header, *trailer, *padding;
size_t gsshsize, k5hsize;
size_t gsstsize, k5tsize;
- size_t i, padlength, rrc = 0, ec = 0;
+ size_t i, rrc = 0, ec = 0;
gss_cfx_wrap_token token;
krb5_error_code ret;
int32_t seq_number;
unsigned usage;
krb5_crypto_iov *data = NULL;
- int paddingoffset = 0;
-
+
header = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
if (header == NULL) {
*minor_status = EINVAL;
return GSS_S_FAILURE;
}
- krb5_crypto_length(context, ctx->crypto, KRB5_CRYPTO_TYPE_PADDING, &padlength);
-
padding = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
- if (padlength != 0 && padding == NULL) {
- *minor_status = EINVAL;
- return GSS_S_FAILURE;
+ if (padding != NULL) {
+ padding->buffer.length = 0;
}
trailer = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
+ major_status = _gk_verify_buffers(minor_status, ctx, header, padding, trailer);
+ if (major_status != GSS_S_COMPLETE) {
+ return major_status;
+ }
+
if (conf_req_flag) {
- ec = padlength;
+ size_t k5psize = 0;
+ size_t k5pbase = 0;
+ size_t k5bsize = 0;
+ size_t size = 0;
- krb5_crypto_length(context, ctx->crypto, KRB5_CRYPTO_TYPE_TRAILER, &k5tsize);
- krb5_crypto_length(context, ctx->crypto, KRB5_CRYPTO_TYPE_HEADER, &k5hsize);
+ for (i = 0; i < iov_count; i++) {
+ switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
+ case GSS_IOV_BUFFER_TYPE_DATA:
+ size += iov[i].buffer.length;
+ break;
+ default:
+ break;
+ }
+ }
- gsshsize = k5hsize + sizeof(*token);
- gsstsize = k5tsize + sizeof(*token); /* encrypted token stored in trailer */
+ size += sizeof(gss_cfx_wrap_token_desc);
+ *minor_status = krb5_crypto_length(context, ctx->crypto,
+ KRB5_CRYPTO_TYPE_HEADER,
+ &k5hsize);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+
+ *minor_status = krb5_crypto_length(context, ctx->crypto,
+ KRB5_CRYPTO_TYPE_TRAILER,
+ &k5tsize);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+
+ *minor_status = krb5_crypto_length(context, ctx->crypto,
+ KRB5_CRYPTO_TYPE_PADDING,
+ &k5pbase);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+
+ if (k5pbase > 1) {
+ k5psize = k5pbase - (size % k5pbase);
+ } else {
+ k5psize = 0;
+ }
+
+ if (k5psize == 0 && IS_DCE_STYLE(ctx)) {
+ *minor_status = krb5_crypto_getblocksize(context, ctx->crypto,
+ &k5bsize);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+ ec = k5bsize;
+ } else {
+ ec = k5psize;
+ }
+
+ gsshsize = sizeof(gss_cfx_wrap_token_desc) + k5hsize;
+ gsstsize = sizeof(gss_cfx_wrap_token_desc) + ec + k5tsize;
} else {
+ if (IS_DCE_STYLE(ctx)) {
+ *minor_status = EINVAL;
+ return GSS_S_FAILURE;
+ }
- krb5_crypto_length(context, ctx->crypto, KRB5_CRYPTO_TYPE_CHECKSUM, &k5tsize);
+ k5hsize = 0;
+ *minor_status = krb5_crypto_length(context, ctx->crypto,
+ KRB5_CRYPTO_TYPE_CHECKSUM,
+ &k5tsize);
+ if (*minor_status)
+ return GSS_S_FAILURE;
- gsshsize = sizeof(*token);
+ gsshsize = sizeof(gss_cfx_wrap_token_desc);
gsstsize = k5tsize;
}
*/
if (trailer == NULL) {
- /* conf_req_flag=0 doesn't support DCE_STYLE */
- if (conf_req_flag == 0) {
- *minor_status = EINVAL;
- major_status = GSS_S_FAILURE;
- goto failure;
- }
rrc = gsstsize;
if (IS_DCE_STYLE(ctx))
rrc -= ec;
gsshsize += gsstsize;
gsstsize = 0;
} else if (GSS_IOV_BUFFER_FLAGS(trailer->type) & GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATE) {
- major_status = allocate_buffer(minor_status, trailer, gsstsize);
+ major_status = _gk_allocate_buffer(minor_status, trailer, gsstsize);
if (major_status)
goto failure;
} else if (trailer->buffer.length < gsstsize) {
*/
if (GSS_IOV_BUFFER_FLAGS(header->type) & GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATE) {
- major_status = allocate_buffer(minor_status, header, gsshsize);
+ major_status = _gk_allocate_buffer(minor_status, header, gsshsize);
if (major_status != GSS_S_COMPLETE)
goto failure;
} else if (header->buffer.length < gsshsize) {
* used to encode the size (in bytes) of the random filler.
*/
token->Flags |= CFXSealed;
- token->EC[0] = (padlength >> 8) & 0xFF;
- token->EC[1] = (padlength >> 0) & 0xFF;
+ token->EC[0] = (ec >> 8) & 0xFF;
+ token->EC[1] = (ec >> 0) & 0xFF;
} else {
/*
/*
plain packet:
- {"header" | encrypt(plaintext-data | padding | E"header")}
+ {"header" | encrypt(plaintext-data | ec-padding | E"header")}
Expanded, this is with with RRC = 0:
- {"header" | krb5-header | plaintext-data | padding | E"header" | krb5-trailer }
+ {"header" | krb5-header | plaintext-data | ec-padding | E"header" | krb5-trailer }
- In DCE-RPC mode == no trailer: RRC = gss "trailer" == length(padding | E"header" | krb5-trailer)
+ In DCE-RPC mode == no trailer: RRC = gss "trailer" == length(ec-padding | E"header" | krb5-trailer)
- {"header" | padding | E"header" | krb5-trailer | krb5-header | plaintext-data }
+ {"header" | ec-padding | E"header" | krb5-trailer | krb5-header | plaintext-data }
*/
i = 0;
case GSS_IOV_BUFFER_TYPE_DATA:
data[i].flags = KRB5_CRYPTO_TYPE_DATA;
break;
- case GSS_IOV_BUFFER_TYPE_PADDING:
- data[i].flags = KRB5_CRYPTO_TYPE_PADDING;
- paddingoffset = i;
- break;
case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
data[i].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY;
break;
* ciphertext.
*/
- /* XXX KRB5_CRYPTO_TYPE_PADDING */
-
/* encrypted CFX header in trailer (or after the header if in
DCE mode). Copy in header into E"header"
*/
if (trailer)
data[i].data.data = trailer->buffer.value;
else
- data[i].data.data = ((uint8_t *)header->buffer.value) + header->buffer.length - k5hsize - k5tsize - sizeof(*token);
+ data[i].data.data = ((uint8_t *)header->buffer.value) + sizeof(*token);
- data[i].data.length = sizeof(*token);
- memcpy(data[i].data.data, token, sizeof(*token));
+ data[i].data.length = ec + sizeof(*token);
+ memset(data[i].data.data, 0xFF, ec);
+ memcpy(((uint8_t *)data[i].data.data) + ec, token, sizeof(*token));
i++;
/* Kerberos trailer comes after the gss trailer */
data[i].flags = KRB5_CRYPTO_TYPE_TRAILER;
- data[i].data.data = ((uint8_t *)data[i-1].data.data) + sizeof(*token);
+ data[i].data.data = ((uint8_t *)data[i-1].data.data) + ec + sizeof(*token);
data[i].data.length = k5tsize;
i++;
token->RRC[1] = (rrc >> 0) & 0xFF;
}
- if (paddingoffset)
- padding->buffer.length = data[paddingoffset].data.length;
-
} else {
/*
plain packet:
for (i = 0; i < iov_count; i++) {
switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
case GSS_IOV_BUFFER_TYPE_DATA:
- case GSS_IOV_BUFFER_TYPE_PADDING:
data[i].flags = KRB5_CRYPTO_TYPE_DATA;
break;
case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
data[i].flags = KRB5_CRYPTO_TYPE_DATA;
data[i].data.data = header->buffer.value;
- data[i].data.length = header->buffer.length;
+ data[i].data.length = sizeof(gss_cfx_wrap_token_desc);
i++;
data[i].flags = KRB5_CRYPTO_TYPE_CHECKSUM;
- data[i].data.data = trailer->buffer.value;
- data[i].data.length = trailer->buffer.length;
+ if (trailer) {
+ data[i].data.data = trailer->buffer.value;
+ } else {
+ data[i].data.data = (uint8_t *)header->buffer.value +
+ sizeof(gss_cfx_wrap_token_desc);
+ }
+ data[i].data.length = k5tsize;
i++;
ret = krb5_create_checksum_iov(context, ctx->crypto, usage, data, i, NULL);
goto failure;
}
- token->EC[0] = (trailer->buffer.length >> 8) & 0xFF;
- token->EC[1] = (trailer->buffer.length >> 0) & 0xFF;
+ if (rrc) {
+ token->RRC[0] = (rrc >> 8) & 0xFF;
+ token->RRC[1] = (rrc >> 0) & 0xFF;
+ }
+
+ token->EC[0] = (k5tsize >> 8) & 0xFF;
+ token->EC[1] = (k5tsize >> 0) & 0xFF;
}
if (conf_state != NULL)
GSS_IOV_BUFFER_TYPE(iov[i].type) == GSS_IOV_BUFFER_TYPE_PADDING ||
GSS_IOV_BUFFER_TYPE(iov[i].type) == GSS_IOV_BUFFER_TYPE_TRAILER)
{
- memcpy(q, iov[i].buffer.value, MIN(iov[i].buffer.length, skip));
+ memcpy(q, iov[i].buffer.value, min(iov[i].buffer.length, skip));
if (iov[i].buffer.length > skip)
break;
skip -= iov[i].buffer.length;
int iov_count)
{
OM_uint32 seq_number_lo, seq_number_hi, major_status, junk;
- gss_iov_buffer_desc *header, *trailer;
+ gss_iov_buffer_desc *header, *trailer, *padding;
gss_cfx_wrap_token token, ttoken;
u_char token_flags;
krb5_error_code ret;
if (header->buffer.length < sizeof(*token)) /* we check exact below */
return GSS_S_DEFECTIVE_TOKEN;
+ padding = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
+ if (padding != NULL && padding->buffer.length != 0) {
+ *minor_status = EINVAL;
+ return GSS_S_FAILURE;
+ }
+
trailer = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
+ major_status = _gk_verify_buffers(minor_status, ctx, header, padding, trailer);
+ if (major_status != GSS_S_COMPLETE) {
+ return major_status;
+ }
+
token = (gss_cfx_wrap_token)header->buffer.value;
if (token->TOK_ID[0] != 0x05 || token->TOK_ID[1] != 0x04)
size_t gsstsize = k5tsize + sizeof(*token);
size_t gsshsize = k5hsize + sizeof(*token);
- if (IS_DCE_STYLE(ctx))
- gsstsize += ec;
- gsshsize += gsstsize;
-
if (rrc != gsstsize) {
major_status = GSS_S_DEFECTIVE_TOKEN;
goto failure;
}
+
+ if (IS_DCE_STYLE(ctx))
+ gsstsize += ec;
+
+ gsshsize += gsstsize;
+
if (header->buffer.length != gsshsize) {
major_status = GSS_S_DEFECTIVE_TOKEN;
goto failure;
for (j = 0; j < iov_count; i++, j++) {
switch (GSS_IOV_BUFFER_TYPE(iov[j].type)) {
case GSS_IOV_BUFFER_TYPE_DATA:
- case GSS_IOV_BUFFER_TYPE_PADDING:
data[i].flags = KRB5_CRYPTO_TYPE_DATA;
break;
case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
DCE mode). Copy in header into E"header"
*/
data[i].flags = KRB5_CRYPTO_TYPE_DATA;
- if (trailer)
+ if (trailer) {
data[i].data.data = trailer->buffer.value;
- else
- data[i].data.data = ((uint8_t *)header->buffer.value) + header->buffer.length - k5hsize - k5tsize - sizeof(*token);
- data[i].data.length = sizeof(*token);
- ttoken = (gss_cfx_wrap_token)data[i].data.data;
+ } else {
+ data[i].data.data = ((uint8_t *)header->buffer.value) +
+ header->buffer.length - k5hsize - k5tsize - ec- sizeof(*token);
+ }
+
+ data[i].data.length = ec + sizeof(*token);
+ ttoken = (gss_cfx_wrap_token)(((uint8_t *)data[i].data.data) + ec);
i++;
/* Kerberos trailer comes after the gss trailer */
data[i].flags = KRB5_CRYPTO_TYPE_TRAILER;
- data[i].data.data = ((uint8_t *)data[i-1].data.data) + sizeof(*token);
+ data[i].data.data = ((uint8_t *)data[i-1].data.data) + ec + sizeof(*token);
data[i].data.length = k5tsize;
i++;
ttoken->RRC[1] = token->RRC[1];
/* Check the integrity of the header */
- if (memcmp(ttoken, token, sizeof(*token)) != 0) {
+ if (ct_memcmp(ttoken, token, sizeof(*token)) != 0) {
major_status = GSS_S_BAD_MIC;
goto failure;
}
} else {
- /* Check RRC */
- if (rrc != 0) {
- *minor_status = EINVAL;
- major_status = GSS_S_FAILURE;
- goto failure;
- }
+ size_t gsstsize = ec;
+ size_t gsshsize = sizeof(*token);
if (trailer == NULL) {
+ /* Check RRC */
+ if (rrc != gsstsize) {
+ *minor_status = EINVAL;
+ major_status = GSS_S_FAILURE;
+ goto failure;
+ }
+
+ gsshsize += gsstsize;
+ gsstsize = 0;
+ } else if (trailer->buffer.length != gsstsize) {
+ major_status = GSS_S_DEFECTIVE_TOKEN;
+ goto failure;
+ } else if (rrc != 0) {
+ /* Check RRC */
*minor_status = EINVAL;
major_status = GSS_S_FAILURE;
goto failure;
}
- if (trailer->buffer.length != ec) {
- *minor_status = EINVAL;
- major_status = GSS_S_FAILURE;
+ if (header->buffer.length != gsshsize) {
+ major_status = GSS_S_DEFECTIVE_TOKEN;
goto failure;
}
for (i = 0; i < iov_count; i++) {
switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
case GSS_IOV_BUFFER_TYPE_DATA:
- case GSS_IOV_BUFFER_TYPE_PADDING:
data[i].flags = KRB5_CRYPTO_TYPE_DATA;
break;
case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
data[i].flags = KRB5_CRYPTO_TYPE_DATA;
data[i].data.data = header->buffer.value;
- data[i].data.length = header->buffer.length;
+ data[i].data.length = sizeof(*token);
i++;
data[i].flags = KRB5_CRYPTO_TYPE_CHECKSUM;
- data[i].data.data = trailer->buffer.value;
- data[i].data.length = trailer->buffer.length;
+ if (trailer) {
+ data[i].data.data = trailer->buffer.value;
+ } else {
+ data[i].data.data = (uint8_t *)header->buffer.value +
+ sizeof(*token);
+ }
+ data[i].data.length = ec;
i++;
token = (gss_cfx_wrap_token)header->buffer.value;
gss_iov_buffer_desc *iov,
int iov_count)
{
+ OM_uint32 major_status;
size_t size;
int i;
- size_t *padding = NULL;
+ gss_iov_buffer_desc *header = NULL;
+ gss_iov_buffer_desc *padding = NULL;
+ gss_iov_buffer_desc *trailer = NULL;
+ size_t gsshsize = 0;
+ size_t gsstsize = 0;
+ size_t k5hsize = 0;
+ size_t k5tsize = 0;
GSSAPI_KRB5_INIT (&context);
*minor_status = 0;
size += iov[i].buffer.length;
break;
case GSS_IOV_BUFFER_TYPE_HEADER:
- *minor_status = krb5_crypto_length(context, ctx->crypto, KRB5_CRYPTO_TYPE_HEADER, &iov[i].buffer.length);
- if (*minor_status)
+ if (header != NULL) {
+ *minor_status = 0;
return GSS_S_FAILURE;
+ }
+ header = &iov[i];
break;
case GSS_IOV_BUFFER_TYPE_TRAILER:
- *minor_status = krb5_crypto_length(context, ctx->crypto, KRB5_CRYPTO_TYPE_TRAILER, &iov[i].buffer.length);
- if (*minor_status)
+ if (trailer != NULL) {
+ *minor_status = 0;
return GSS_S_FAILURE;
+ }
+ trailer = &iov[i];
break;
case GSS_IOV_BUFFER_TYPE_PADDING:
if (padding != NULL) {
*minor_status = 0;
return GSS_S_FAILURE;
}
- padding = &iov[i].buffer.length;
+ padding = &iov[i];
break;
case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
break;
return GSS_S_FAILURE;
}
}
+
+ major_status = _gk_verify_buffers(minor_status, ctx, header, padding, trailer);
+ if (major_status != GSS_S_COMPLETE) {
+ return major_status;
+ }
+
+ if (conf_req_flag) {
+ size_t k5psize = 0;
+ size_t k5pbase = 0;
+ size_t k5bsize = 0;
+ size_t ec = 0;
+
+ size += sizeof(gss_cfx_wrap_token_desc);
+
+ *minor_status = krb5_crypto_length(context, ctx->crypto,
+ KRB5_CRYPTO_TYPE_HEADER,
+ &k5hsize);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+
+ *minor_status = krb5_crypto_length(context, ctx->crypto,
+ KRB5_CRYPTO_TYPE_TRAILER,
+ &k5tsize);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+
+ *minor_status = krb5_crypto_length(context, ctx->crypto,
+ KRB5_CRYPTO_TYPE_PADDING,
+ &k5pbase);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+
+ if (k5pbase > 1) {
+ k5psize = k5pbase - (size % k5pbase);
+ } else {
+ k5psize = 0;
+ }
+
+ if (k5psize == 0 && IS_DCE_STYLE(ctx)) {
+ *minor_status = krb5_crypto_getblocksize(context, ctx->crypto,
+ &k5bsize);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+
+ ec = k5bsize;
+ } else {
+ ec = k5psize;
+ }
+
+ gsshsize = sizeof(gss_cfx_wrap_token_desc) + k5hsize;
+ gsstsize = sizeof(gss_cfx_wrap_token_desc) + ec + k5tsize;
+ } else {
+ *minor_status = krb5_crypto_length(context, ctx->crypto,
+ KRB5_CRYPTO_TYPE_CHECKSUM,
+ &k5tsize);
+ if (*minor_status)
+ return GSS_S_FAILURE;
+
+ gsshsize = sizeof(gss_cfx_wrap_token_desc);
+ gsstsize = k5tsize;
+ }
+
+ if (trailer != NULL) {
+ trailer->buffer.length = gsstsize;
+ } else {
+ gsshsize += gsstsize;
+ }
+
+ header->buffer.length = gsshsize;
+
if (padding) {
- size_t pad;
- krb5_crypto_length(context, ctx->crypto, KRB5_CRYPTO_TYPE_PADDING, &pad);
- if (pad > 1) {
- *padding = pad - (size % pad);
- if (*padding == pad)
- *padding = 0;
- } else
- *padding = 0;
+ /* padding is done via EC and is contained in the header or trailer */
+ padding->buffer.length = 0;
+ }
+
+ if (conf_state) {
+ *conf_state = conf_req_flag;
}
return GSS_S_COMPLETE;
int32_t seq_number;
u_char *p;
- ret = _gsskrb5cfx_wrap_length_cfx(ctx, context,
+ ret = _gsskrb5cfx_wrap_length_cfx(context,
ctx->crypto, conf_req_flag,
+ IS_DCE_STYLE(ctx),
input_message_buffer->length,
&wrapped_len, &cksumsize, &padlength);
if (ret != 0) {
((gss_cfx_wrap_token)p)->RRC[1] = token->RRC[1];
/* Check the integrity of the header */
- if (memcmp(p, token, sizeof(*token)) != 0) {
+ if (ct_memcmp(p, token, sizeof(*token)) != 0) {
krb5_data_free(&data);
return GSS_S_BAD_MIC;
}
return GSS_S_DEFECTIVE_TOKEN;
}
- if (memcmp(token->Filler, "\xff\xff\xff\xff\xff", 5) != 0) {
+ if (ct_memcmp(token->Filler, "\xff\xff\xff\xff\xff", 5) != 0) {
return GSS_S_DEFECTIVE_TOKEN;
}
git.samba.org / kai / samba.git / blobdiff