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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
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/*
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* Implementation of get_username() for Windows.
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*/
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#include "putty.h"
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#ifndef SECURITY_WIN32
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#define SECURITY_WIN32
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#endif
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#include <security.h>
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char *get_username(void)
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{
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DWORD namelen;
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char *user;
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bool got_username = false;
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DECL_WINDOWS_FUNCTION(static, BOOLEAN, GetUserNameExA,
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(EXTENDED_NAME_FORMAT, LPSTR, PULONG));
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{
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static bool tried_usernameex = false;
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if (!tried_usernameex) {
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/* Not available on Win9x, so load dynamically */
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HMODULE secur32 = load_system32_dll("secur32.dll");
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/* If MIT Kerberos is installed, the following call to
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GET_WINDOWS_FUNCTION makes Windows implicitly load
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sspicli.dll WITHOUT proper path sanitizing, so better
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load it properly before */
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HMODULE sspicli = load_system32_dll("sspicli.dll");
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(void)sspicli; /* squash compiler warning about unused variable */
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GET_WINDOWS_FUNCTION(secur32, GetUserNameExA);
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tried_usernameex = true;
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}
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}
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if (p_GetUserNameExA) {
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/*
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* If available, use the principal -- this avoids the problem
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* that the local username is case-insensitive but Kerberos
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* usernames are case-sensitive.
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*/
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/* Get the length */
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namelen = 0;
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(void) p_GetUserNameExA(NameUserPrincipal, NULL, &namelen);
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user = snewn(namelen, char);
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got_username = p_GetUserNameExA(NameUserPrincipal, user, &namelen);
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if (got_username) {
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char *p = strchr(user, '@');
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if (p) *p = 0;
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} else {
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sfree(user);
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}
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}
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if (!got_username) {
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/* Fall back to local user name */
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namelen = 0;
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if (!GetUserName(NULL, &namelen)) {
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/*
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* Apparently this doesn't work at least on Windows XP SP2.
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* Thus assume a maximum of 256. It will fail again if it
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* doesn't fit.
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*/
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namelen = 256;
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}
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user = snewn(namelen, char);
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got_username = GetUserName(user, &namelen);
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if (!got_username) {
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sfree(user);
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}
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}
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return got_username ? user : NULL;
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}
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