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Temporary fix to ssh redirection issue in Powershell environment (+ one other minor fix) (#98)

Browse Source 
PowerShell/Win32-OpenSSH#609
PowerShell/Win32-OpenSSH#608
This commit is contained in:
Manoj Ampalam 2017-03-28 14:54:19 -07:00 committed by GitHub
parent dd8cfb0e06
commit 6fd81a671c
2 changed files with 41 additions and 7 deletions
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2
contrib/win32/openssh/install-sshd.ps1
View File

@ -30,7 +30,7 @@ if (Get-Service ssh-agent -ErrorAction SilentlyContinue)
New-Service -Name ssh-agent -BinaryPathName $sshagentpath -Description "SSH Agent" -StartupType Manual | Out-Null
cmd.exe /c 'sc.exe sdset ssh-agent D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)(A;;RP;;;AU)'
New-Service -Name sshd -BinaryPathName $sshdpath -Description "SSH Deamon" -StartupType Manual -DependsOn ssh-agent | Out-Null
New-Service -Name sshd -BinaryPathName $sshdpath -Description "SSH Daemon" -StartupType Manual -DependsOn ssh-agent | Out-Null
sc.exe config sshd obj= $account
Push-Location

46
contrib/win32/win32compat/fileio.c
View File

@ -180,29 +180,29 @@ fileio_pipe(struct w32_io* pio[2])
sec_attributes.nLength = 0;
/* create named pipe */
read_handle = CreateNamedPipeA(pipe_name,
PIPE_ACCESS_INBOUND | FILE_FLAG_OVERLAPPED,
write_handle = CreateNamedPipeA(pipe_name,
PIPE_ACCESS_OUTBOUND | FILE_FLAG_OVERLAPPED,
PIPE_TYPE_BYTE | PIPE_WAIT,
1,
4096,
4096,
0,
&sec_attributes);
if (read_handle == INVALID_HANDLE_VALUE) {
if (write_handle == INVALID_HANDLE_VALUE) {
errno = errno_from_Win32LastError();
debug3("pipe - CreateNamedPipe() ERROR:%d", errno);
goto error;
}
/* connect to named pipe */
write_handle = CreateFileA(pipe_name,
GENERIC_WRITE,
read_handle = CreateFileA(pipe_name,
GENERIC_READ,
0,
&sec_attributes,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
NULL);
if (write_handle == INVALID_HANDLE_VALUE) {
if (read_handle == INVALID_HANDLE_VALUE) {
errno = errno_from_Win32LastError();
debug3("pipe - ERROR CreateFile() :%d", errno);
goto error;
@ -525,6 +525,7 @@ int
fileio_write(struct w32_io* pio, const void *buf, unsigned int max)
{
int bytes_copied;
DWORD pipe_flags = 0, pipe_instances = 0;
debug4("write - io:%p", pio);
if (pio->write_details.pending) {
@ -571,6 +572,39 @@ fileio_write(struct w32_io* pio, const void *buf, unsigned int max)
}
else
return -1;
} else if ( FILETYPE(pio) == FILE_TYPE_PIPE &&
GetNamedPipeInfo(WINHANDLE(pio), &pipe_flags, NULL, NULL, &pipe_instances) &&
pipe_flags == PIPE_CLIENT_END && pipe_instances == 1) {
/*
* TODO - Figure out a better solution to this problem
* IO handle corresponding to this object (pio->handle) may be referring
* to something that isn't opened in overlapped mode. While all handles
* opened by this POSIX wrapper are opened in overlapped mode, other handles
* that are inherited (ex. via std i/o) are typically not.
* Ex. When we do this in Powershell
* $o = ssh.exe user@target hostname
* Powershell creates anonymous pipes (that do not support overlapped i.o)
* Calling asynchronous I/O APIs (WriteFileEx) for example will not work in
* those cases (the callback is never called and it typically manifests as a
* hang to end user
*
* This conditional logic is put in place to specifically handle Powershell
* redirection scenarios. Thinking behind these conditions
* - should be a pipe handle. console I/O is handled in termio.c, impacting file i/o
* scenarios not found yet.
* - pipe should be the client end. This is to skip pipes created internally in POSIX
* wrapper (by pipe() calls) - The write ends on these pipes are on server
* - pipe_instances == 1. This is to skip pipe handles created as part of Connect(AF_UNIX)
* sockets (that typically are created for unlimited instances).
* For such I/O we do a synchronous write.
*/
/* DebugBreak() */;
if (WriteFile(WINHANDLE(pio), pio->write_details.buf, bytes_copied, &bytes_copied, NULL) == FALSE) {
errno = errno_from_Win32LastError();
debug3("write - WriteFile() ERROR:%d, io:%p", GetLastError(), pio);
return -1;
}
return bytes_copied;
} else {
if (WriteFileEx(WINHANDLE(pio), pio->write_details.buf, bytes_copied,
&pio->write_overlapped, &WriteCompletionRoutine)) {