diff options
Diffstat (limited to 'source3/librpc/rpc')
| -rw-r--r-- | source3/librpc/rpc/dcerpc.h | 3 | ||||
| -rw-r--r-- | source3/librpc/rpc/dcerpc_helpers.c | 43 |
2 files changed, 27 insertions, 19 deletions
diff --git a/source3/librpc/rpc/dcerpc.h b/source3/librpc/rpc/dcerpc.h index fd80dbeb04..f07403ae44 100644 --- a/source3/librpc/rpc/dcerpc.h +++ b/source3/librpc/rpc/dcerpc.h @@ -140,7 +140,8 @@ NTSTATUS dcerpc_pull_dcerpc_auth(TALLOC_CTX *mem_ctx, struct dcerpc_auth *r, bool bigendian); NTSTATUS dcerpc_guess_sizes(struct pipe_auth_data *auth, - size_t data_left, size_t max_xmit_frag, + size_t header_len, size_t data_left, + size_t max_xmit_frag, size_t pad_alignment, size_t *data_to_send, size_t *frag_len, size_t *auth_len, size_t *pad_len); NTSTATUS dcerpc_add_auth_footer(struct pipe_auth_data *auth, diff --git a/source3/librpc/rpc/dcerpc_helpers.c b/source3/librpc/rpc/dcerpc_helpers.c index e089e9cbf0..84f7ce4c82 100644 --- a/source3/librpc/rpc/dcerpc_helpers.c +++ b/source3/librpc/rpc/dcerpc_helpers.c @@ -246,20 +246,23 @@ NTSTATUS dcerpc_pull_dcerpc_auth(TALLOC_CTX *mem_ctx, * auth token and pad lengths. * * @param auth The pipe_auth_data structure for this pipe. +* @param header_len The length of the packet header * @param data_left The data left in the send buffer -* @param data_to_send The max data we will send in the pdu -* @param frag_len The total length of the fragment -* @param auth_len The length of the auth trailer -* @param pad_len The padding to be applied +* @param max_xmit_frag The max fragment size. +* @param pad_alignment The NDR padding size. +* @param data_to_send [out] The max data we will send in the pdu +* @param frag_len [out] The total length of the fragment +* @param auth_len [out] The length of the auth trailer +* @param pad_len [out] The padding to be applied * * @return A NT Error status code. */ NTSTATUS dcerpc_guess_sizes(struct pipe_auth_data *auth, - size_t data_left, size_t max_xmit_frag, + size_t header_len, size_t data_left, + size_t max_xmit_frag, size_t pad_alignment, size_t *data_to_send, size_t *frag_len, size_t *auth_len, size_t *pad_len) { - size_t data_space; size_t max_len; size_t mod_len; struct gse_context *gse_ctx; @@ -273,11 +276,11 @@ NTSTATUS dcerpc_guess_sizes(struct pipe_auth_data *auth, case DCERPC_AUTH_LEVEL_NONE: case DCERPC_AUTH_LEVEL_CONNECT: case DCERPC_AUTH_LEVEL_PACKET: - data_space = max_xmit_frag - DCERPC_REQUEST_LENGTH; - *data_to_send = MIN(data_space, data_left); + max_len = max_xmit_frag - header_len; + *data_to_send = MIN(max_len, data_left); *pad_len = 0; *auth_len = 0; - *frag_len = DCERPC_REQUEST_LENGTH + *data_to_send; + *frag_len = header_len + *data_to_send; return NT_STATUS_OK; case DCERPC_AUTH_LEVEL_PRIVACY: @@ -294,9 +297,7 @@ NTSTATUS dcerpc_guess_sizes(struct pipe_auth_data *auth, /* Sign/seal case, calculate auth and pad lengths */ - max_len = max_xmit_frag - - DCERPC_REQUEST_LENGTH - - DCERPC_AUTH_TRAILER_LENGTH; + max_len = max_xmit_frag - header_len - DCERPC_AUTH_TRAILER_LENGTH; /* Treat the same for all authenticated rpc requests. */ switch (auth->auth_type) { @@ -349,17 +350,23 @@ NTSTATUS dcerpc_guess_sizes(struct pipe_auth_data *auth, return NT_STATUS_INVALID_PARAMETER; } - data_space = max_len - *auth_len; + max_len -= *auth_len; - *data_to_send = MIN(data_space, data_left); - mod_len = *data_to_send % CLIENT_NDR_PADDING_SIZE; + *data_to_send = MIN(max_len, data_left); + + mod_len = (header_len + *data_to_send) % pad_alignment; if (mod_len) { - *pad_len = CLIENT_NDR_PADDING_SIZE - mod_len; + *pad_len = pad_alignment - mod_len; } else { *pad_len = 0; } - *frag_len = DCERPC_REQUEST_LENGTH + *data_to_send + *pad_len - + DCERPC_AUTH_TRAILER_LENGTH + *auth_len; + + if (*data_to_send + *pad_len > max_len) { + *data_to_send -= pad_alignment; + } + + *frag_len = header_len + *data_to_send + *pad_len + + DCERPC_AUTH_TRAILER_LENGTH + *auth_len; return NT_STATUS_OK; } |