226 lines
6.9 KiB
C
226 lines
6.9 KiB
C
/*
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* Author: Manoj Ampalam <manoj.ampalam@microsoft.com>
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* ssh-agent implementation on Windows
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*
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* Copyright (c) 2015 Microsoft Corp.
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* All rights reserved
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*
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* Microsoft openssh win32 port
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "agent.h"
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#include "agent-request.h"
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int process_request(struct agent_connection*);
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#define ABORT_CONNECTION_RETURN(c) do { \
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c->state = DONE; \
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agent_cleanup_connection(c); \
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return; \
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} while (0)
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void
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agent_connection_on_error(struct agent_connection* con, DWORD error)
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{
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ABORT_CONNECTION_RETURN(con);
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}
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void
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agent_connection_on_io(struct agent_connection* con, DWORD bytes, OVERLAPPED* ol)
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{
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/* process error */
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debug3("connection io %p #bytes:%d state:%d", con, bytes, con->state);
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if ((bytes == 0) && (GetOverlappedResult(con->pipe_handle, ol, &bytes, FALSE) == FALSE))
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ABORT_CONNECTION_RETURN(con);
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if (con->state == DONE)
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DebugBreak();
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switch (con->state) {
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case LISTENING:
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case WRITING:
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/* Writing is done, read next request */
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/* assert on assumption that write always completes on sending all bytes*/
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if (bytes != con->io_buf.num_bytes)
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DebugBreak();
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con->state = READING_HEADER;
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ZeroMemory(&con->io_buf, sizeof(con->io_buf));
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if (!ReadFile(con->pipe_handle, con->io_buf.buf,
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HEADER_SIZE, NULL, &con->ol) && (GetLastError() != ERROR_IO_PENDING))
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ABORT_CONNECTION_RETURN(con);
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break;
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case READING_HEADER:
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con->io_buf.transferred += bytes;
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if (con->io_buf.transferred == HEADER_SIZE) {
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con->io_buf.num_bytes = PEEK_U32(con->io_buf.buf);
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con->io_buf.transferred = 0;
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if (con->io_buf.num_bytes > MAX_MESSAGE_SIZE)
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ABORT_CONNECTION_RETURN(con);
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con->state = READING;
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if (!ReadFile(con->pipe_handle, con->io_buf.buf,
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con->io_buf.num_bytes, NULL, &con->ol)&&(GetLastError() != ERROR_IO_PENDING))
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ABORT_CONNECTION_RETURN(con);
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} else {
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if (!ReadFile(con->pipe_handle, con->io_buf.buf + con->io_buf.num_bytes,
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HEADER_SIZE - con->io_buf.num_bytes, NULL, &con->ol)&& (GetLastError() != ERROR_IO_PENDING))
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ABORT_CONNECTION_RETURN(con);
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}
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break;
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case READING:
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con->io_buf.transferred += bytes;
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if (con->io_buf.transferred == con->io_buf.num_bytes) {
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if (process_request(con) != 0) {
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ABORT_CONNECTION_RETURN(con);
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}
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con->state = WRITING;
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if (!WriteFile(con->pipe_handle, con->io_buf.buf,
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con->io_buf.num_bytes, NULL, &con->ol)&& (GetLastError() != ERROR_IO_PENDING) )
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ABORT_CONNECTION_RETURN(con);
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} else {
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if (!ReadFile(con->pipe_handle, con->io_buf.buf + con->io_buf.transferred,
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con->io_buf.num_bytes - con->io_buf.transferred, NULL, &con->ol)&& (GetLastError() != ERROR_IO_PENDING))
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ABORT_CONNECTION_RETURN(con);
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}
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break;
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default:
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DebugBreak();
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}
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}
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void
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agent_connection_disconnect(struct agent_connection* con)
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{
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CancelIoEx(con->pipe_handle, NULL);
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DisconnectNamedPipe(con->pipe_handle);
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}
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static int
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get_con_client_type(struct agent_connection* con)
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{
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int r = -1;
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char system_sid[SECURITY_MAX_SID_SIZE];
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char ns_sid[SECURITY_MAX_SID_SIZE];
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char ls_sid[SECURITY_MAX_SID_SIZE];
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DWORD reg_dom_len = 0, info_len = 0, sid_size;
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SID_NAME_USE nuse;
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HANDLE token;
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TOKEN_USER* info = NULL;
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HANDLE pipe = con->pipe_handle;
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if (ImpersonateNamedPipeClient(pipe) == FALSE)
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return -1;
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if (OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, FALSE, &token) == FALSE ||
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GetTokenInformation(token, TokenUser, NULL, 0, &info_len) == TRUE ||
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(info = (TOKEN_USER*)malloc(info_len)) == NULL ||
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GetTokenInformation(token, TokenUser, info, info_len, &info_len) == FALSE)
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goto done;
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sid_size = SECURITY_MAX_SID_SIZE;
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if (CreateWellKnownSid(WinLocalSystemSid, NULL, system_sid, &sid_size) == FALSE)
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goto done;
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sid_size = SECURITY_MAX_SID_SIZE;
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if (CreateWellKnownSid(WinNetworkServiceSid, NULL, ns_sid, &sid_size) == FALSE)
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goto done;
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sid_size = SECURITY_MAX_SID_SIZE;
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if (CreateWellKnownSid(WinLocalServiceSid, NULL, ls_sid, &sid_size) == FALSE)
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goto done;
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if (EqualSid(info->User.Sid, system_sid) ||
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EqualSid(info->User.Sid, ls_sid) ||
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EqualSid(info->User.Sid, ns_sid))
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con->client_type = MACHINE;
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else
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con->client_type = USER;
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debug2("client type: %s", con->client_type == MACHINE? "machine" : "user");
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r = 0;
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done:
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if (info)
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free(info);
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RevertToSelf();
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return r;
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}
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static int
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process_request(struct agent_connection* con)
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{
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int r = -1;
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struct sshbuf *request = NULL, *response = NULL;
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u_char type;
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if (con->client_type == UNKNOWN && get_con_client_type(con) == -1) {
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debug("unable to get client process type");
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goto done;
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}
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request = sshbuf_from(con->io_buf.buf, con->io_buf.num_bytes);
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response = sshbuf_new();
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if ((request == NULL) || (response == NULL))
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goto done;
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if (sshbuf_get_u8(request, &type) != 0)
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return -1;
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debug("process agent request type %d", type);
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switch (type) {
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case SSH2_AGENTC_ADD_IDENTITY:
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r = process_add_identity(request, response, con);
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break;
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case SSH2_AGENTC_REQUEST_IDENTITIES:
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r = process_request_identities(request, response, con);
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break;
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case SSH2_AGENTC_SIGN_REQUEST:
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r = process_sign_request(request, response, con);
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break;
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case SSH2_AGENTC_REMOVE_IDENTITY:
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r = process_remove_key(request, response, con);
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break;
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case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
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r = process_remove_all(request, response, con);
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break;
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case SSH_AGENT_AUTHENTICATE:
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r = process_authagent_request(request, response, con);
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break;
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default:
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debug("unknown agent request %d", type);
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r = -1;
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break;
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}
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done:
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if (request)
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sshbuf_free(request);
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ZeroMemory(&con->io_buf, sizeof(con->io_buf));
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if (r == 0) {
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POKE_U32(con->io_buf.buf, sshbuf_len(response));
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memcpy(con->io_buf.buf + 4, sshbuf_ptr(response), sshbuf_len(response));
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con->io_buf.num_bytes = sshbuf_len(response) + 4;
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}
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if (response)
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sshbuf_free(response);
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return r;
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} |