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https://git.tartarus.org/simon/putty.git
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cea1329b9e
Almost all the call sites were doing a cumbersome dupprintf-use-free cycle to get a formatted message into an ErrorSocket anyway, so it seems more sensible to give them an easier way of doing so. The few call sites that were passing a constant string literal _shouldn't_ have been - they'll be all the better for adding a strerror suffix to the message they were previously giving!
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/*
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* Windows support module which deals with being a named-pipe client.
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*/
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#include <stdio.h>
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#include <assert.h>
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#include "tree234.h"
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#include "putty.h"
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#include "network.h"
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#include "proxy.h"
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#include "ssh.h"
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#if !defined NO_SECURITY
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#include "winsecur.h"
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Socket *make_handle_socket(HANDLE send_H, HANDLE recv_H, HANDLE stderr_H,
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Plug *plug, int overlapped);
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Socket *new_named_pipe_client(const char *pipename, Plug *plug)
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{
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HANDLE pipehandle;
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PSID usersid, pipeowner;
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PSECURITY_DESCRIPTOR psd;
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Socket *ret;
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assert(strncmp(pipename, "\\\\.\\pipe\\", 9) == 0);
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assert(strchr(pipename + 9, '\\') == NULL);
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while (1) {
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pipehandle = CreateFile(pipename, GENERIC_READ | GENERIC_WRITE,
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0, NULL, OPEN_EXISTING,
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FILE_FLAG_OVERLAPPED, NULL);
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if (pipehandle != INVALID_HANDLE_VALUE)
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break;
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if (GetLastError() != ERROR_PIPE_BUSY) {
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return new_error_socket_fmt(
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plug, "Unable to open named pipe '%s': %s",
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pipename, win_strerror(GetLastError()));
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}
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/*
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* If we got ERROR_PIPE_BUSY, wait for the server to
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* create a new pipe instance. (Since the server is
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* expected to be winnps.c, which will do that immediately
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* after a previous connection is accepted, that shouldn't
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* take excessively long.)
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*/
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if (!WaitNamedPipe(pipename, NMPWAIT_USE_DEFAULT_WAIT)) {
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return new_error_socket_fmt(
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plug, "Error waiting for named pipe '%s': %s",
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pipename, win_strerror(GetLastError()));
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}
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}
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if ((usersid = get_user_sid()) == NULL) {
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CloseHandle(pipehandle);
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return new_error_socket_fmt(
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plug, "Unable to get user SID: %s", win_strerror(GetLastError()));
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}
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if (p_GetSecurityInfo(pipehandle, SE_KERNEL_OBJECT,
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OWNER_SECURITY_INFORMATION,
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&pipeowner, NULL, NULL, NULL,
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&psd) != ERROR_SUCCESS) {
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CloseHandle(pipehandle);
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return new_error_socket_fmt(
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plug, "Unable to get named pipe security information: %s",
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win_strerror(GetLastError()));
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}
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if (!EqualSid(pipeowner, usersid)) {
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CloseHandle(pipehandle);
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LocalFree(psd);
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return new_error_socket_fmt(
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plug, "Owner of named pipe '%s' is not us", pipename);
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}
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LocalFree(psd);
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return make_handle_socket(pipehandle, pipehandle, NULL, plug, TRUE);
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}
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#endif /* !defined NO_SECURITY */
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