Added Pageant, a first-attempt PuTTY authentication agent

[sgt/putty] / pageantc.c

diff --git a/pageantc.c b/pageantc.c
new file mode 100644 (file)
index 0000000..e718313
--- /dev/null
+++ b/pageantc.c
@@ -0,0 +1,167 @@
+/*
+ * Pageant client code.
+ */
+
+#include <windows.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef TESTMODE
+#define debug(x) (printf x)
+#else
+#define debug(x)
+#endif
+
+int agent_exists(void) {
+    HWND hwnd;
+    hwnd = FindWindow("Pageant", "Pageant");
+    if (!hwnd)
+        return FALSE;
+    else
+        return TRUE;
+}
+
+void agent_query(void *in, int inlen, void **out, int *outlen) {
+#if 0
+#define MAILSLOTNAME "\\\\.\\mailslot\\pageant_listener"
+    SECURITY_ATTRIBUTES sa;
+    HANDLE my_mailslot, agent_mailslot;
+    char name[64];
+    char *p;
+    DWORD msglen, byteswritten, bytesread, inid;
+
+    *out = NULL;
+    *outlen = 0;
+
+    agent_mailslot = CreateFile(MAILSLOTNAME, GENERIC_WRITE,
+                                FILE_SHARE_READ, (LPSECURITY_ATTRIBUTES)NULL,
+                                OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
+                                (HANDLE)NULL);
+    debug(("opened %s: %p\n", MAILSLOTNAME, agent_mailslot));
+    if (agent_mailslot == INVALID_HANDLE_VALUE)
+        return;
+
+    inid = GetCurrentThreadId();
+    inid--;
+
+    sa.nLength = sizeof(sa);
+    sa.lpSecurityDescriptor = NULL;
+    sa.bInheritHandle = TRUE;
+
+    do {
+        sprintf(name, "\\\\.\\mailslot\\pclient_request_%08x", ++inid);
+        /*
+         * Five-minute timeout.
+         */
+        my_mailslot = CreateMailslot(name, 0, 0, &sa);
+        debug(("mailslot %s: %p\n", name, my_mailslot));
+    } while (my_mailslot == INVALID_HANDLE_VALUE);
+    Sleep(3000);
+
+    msglen = strlen(name) + 1 + inlen;
+    p = malloc(msglen);
+    if (!p) {
+        CloseHandle(my_mailslot);
+        CloseHandle(agent_mailslot);
+        return;
+    }
+
+    strcpy(p, name);
+    memcpy(p+strlen(p)+1, in, inlen);
+
+    debug(("ooh\n"));
+    if (WriteFile(agent_mailslot, p, msglen, &byteswritten, NULL) == 0) {
+        debug(("eek!\n"));
+        free(p);
+        CloseHandle(my_mailslot);
+        CloseHandle(agent_mailslot);
+        return;
+    }
+    debug(("aah\n"));
+    free(p);
+    CloseHandle(agent_mailslot);
+
+    WaitForSingleObject(my_mailslot, 3000000);
+    debug(("waited\n"));
+    if (!GetMailslotInfo(my_mailslot, NULL, &msglen, NULL, NULL)) {
+        CloseHandle(my_mailslot);
+        return;
+    }
+    if (msglen == MAILSLOT_NO_MESSAGE) {
+        debug(("no message\n"));
+        CloseHandle(my_mailslot);
+        return;
+    }
+    debug(("msglen=%d\n", msglen));
+    p = malloc(msglen);
+    if (!p) {
+        CloseHandle(my_mailslot);
+        return;
+    }
+    if (ReadFile(my_mailslot, p, msglen, &bytesread, NULL) == 0 &&
+        bytesread == msglen) {
+        *out = p;
+        *outlen = msglen;
+    }
+    CloseHandle(my_mailslot);
+#endif
+    HWND hwnd;
+    char mapname[64];
+    HANDLE filemap;
+    void *p, *ret;
+    int id, retlen;
+    COPYDATASTRUCT cds;
+
+    *out = NULL;
+    *outlen = 0;
+
+    hwnd = FindWindow("Pageant", "Pageant");
+    debug(("hwnd is %p\n", hwnd));
+    if (!hwnd)
+        return;
+    cds.dwData = 0;                    /* FIXME */
+    cds.cbData = inlen;
+    cds.lpData = in;
+    id = SendMessage(hwnd, WM_COPYDATA, (WPARAM)NULL, (LPARAM)&cds);
+    debug(("return is %d\n", id));
+    if (id > 0) {
+        sprintf(mapname, "PageantReply%08x", id);
+        filemap = OpenFileMapping(FILE_MAP_READ, FALSE, mapname);
+        debug(("name is `%s', filemap is %p\n", mapname, filemap));
+        debug(("error is %d\n", GetLastError()));
+        if (filemap != NULL && filemap != INVALID_HANDLE_VALUE) {
+            p = MapViewOfFile(filemap, FILE_MAP_READ, 0, 0, 0);
+            debug(("p is %p\n", p));
+            if (p) {
+                retlen = *(int *)p;
+                debug(("len is %d\n", retlen));
+                ret = malloc(retlen);
+                if (ret) {
+                    memcpy(ret, ((int *)p) + 1, retlen);
+                    *out = ret;
+                    *outlen = retlen;
+                }
+                UnmapViewOfFile(p);
+            }
+            CloseHandle(filemap);
+        }
+        /* FIXME: tell agent to close its handle too */
+    }
+}
+
+#ifdef TESTMODE
+
+int main(void) {
+    void *msg;
+    int len;
+    int i;
+
+    agent_query("\0\0\0\1\1", 5, &msg, &len);
+    debug(("%d:", len));
+    for (i = 0; i < len; i++)
+        debug((" %02x", ((unsigned char *)msg)[i]));
+    debug(("\n"));
+    return 0;
+}
+
+#endif