1 /* $NetBSD: expand_path.c,v 1.1.1.2 2014/04/24 12:45:50 pettai Exp $ */
4 /***********************************************************************
5 * Copyright (c) 2009, Secure Endpoints Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * - Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * - Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
29 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
31 * OF THE POSSIBILITY OF SUCH DAMAGE.
33 **********************************************************************/
35 #include "krb5_locl.h"
44 * Expand a %{TEMP} token
46 * The %{TEMP} token expands to the temporary path for the current
47 * user as returned by GetTempPath().
49 * @note: Since the GetTempPath() function relies on the TMP or TEMP
50 * environment variables, this function will failover to the system
51 * temporary directory until the user profile is loaded. In addition,
52 * the returned path may or may not exist.
55 _expand_temp_folder(krb5_context context
, PTYPE param
, const char *postfix
, char **ret
)
57 TCHAR tpath
[MAX_PATH
];
60 if (!GetTempPath(sizeof(tpath
)/sizeof(tpath
[0]), tpath
)) {
62 krb5_set_error_message(context
, EINVAL
,
63 "Failed to get temporary path (GLE=%d)",
70 if (len
> 0 && tpath
[len
- 1] == '\\')
71 tpath
[len
- 1] = '\0';
77 krb5_set_error_message(context
, ENOMEM
, "strdup - Out of memory");
84 extern HINSTANCE _krb5_hInstance
;
87 * Expand a %{BINDIR} token
89 * This is also used to expand a few other tokens on Windows, since
90 * most of the executable binaries end up in the same directory. The
91 * "bin" directory is considered to be the directory in which the
92 * krb5.dll is located.
95 _expand_bin_dir(krb5_context context
, PTYPE param
, const char *postfix
, char **ret
)
101 nc
= GetModuleFileName(_krb5_hInstance
, path
, sizeof(path
)/sizeof(path
[0]));
103 nc
== sizeof(path
)/sizeof(path
[0])) {
107 lastSlash
= strrchr(path
, '\\');
108 if (lastSlash
!= NULL
) {
109 TCHAR
*fslash
= strrchr(lastSlash
, '/');
118 if (strlcat(path
, postfix
, sizeof(path
)/sizeof(path
[0])) >= sizeof(path
)/sizeof(path
[0]))
130 * Expand a %{USERID} token
132 * The %{USERID} token expands to the string representation of the
133 * user's SID. The user account that will be used is the account
134 * corresponding to the current thread's security token. This means
137 * - If the current thread token has the anonymous impersonation
138 * level, the call will fail.
140 * - If the current thread is impersonating a token at
141 * SecurityIdentification level the call will fail.
145 _expand_userid(krb5_context context
, PTYPE param
, const char *postfix
, char **ret
)
148 HANDLE hThread
= NULL
;
149 HANDLE hToken
= NULL
;
150 PTOKEN_OWNER pOwner
= NULL
;
152 LPTSTR strSid
= NULL
;
154 hThread
= GetCurrentThread();
156 if (!OpenThreadToken(hThread
, TOKEN_QUERY
,
157 FALSE
, /* Open the thread token as the
158 current thread user. */
161 DWORD le
= GetLastError();
163 if (le
== ERROR_NO_TOKEN
) {
164 HANDLE hProcess
= GetCurrentProcess();
167 if (!OpenProcessToken(hProcess
, TOKEN_QUERY
, &hToken
))
173 krb5_set_error_message(context
, rv
,
174 "Can't open thread token (GLE=%d)", le
);
179 if (!GetTokenInformation(hToken
, TokenOwner
, NULL
, 0, &len
)) {
180 if (GetLastError() != ERROR_INSUFFICIENT_BUFFER
) {
182 krb5_set_error_message(context
, rv
,
183 "Unexpected error reading token information (GLE=%d)",
190 krb5_set_error_message(context
, rv
,
191 "GetTokenInformation() returned truncated buffer");
195 pOwner
= malloc(len
);
196 if (pOwner
== NULL
) {
198 krb5_set_error_message(context
, rv
, "Out of memory");
203 krb5_set_error_message(context
, rv
, "GetTokenInformation() returned truncated buffer");
207 if (!GetTokenInformation(hToken
, TokenOwner
, pOwner
, len
, &len
)) {
209 krb5_set_error_message(context
, rv
, "GetTokenInformation() failed. GLE=%d", GetLastError());
213 if (!ConvertSidToStringSid(pOwner
->Owner
, &strSid
)) {
215 krb5_set_error_message(context
, rv
, "Can't convert SID to string. GLE=%d", GetLastError());
219 *ret
= strdup(strSid
);
220 if (*ret
== NULL
&& context
)
221 krb5_set_error_message(context
, rv
, "Out of memory");
239 * Expand a folder identified by a CSIDL
243 _expand_csidl(krb5_context context
, PTYPE folder
, const char *postfix
, char **ret
)
245 TCHAR path
[MAX_PATH
];
248 if (SHGetFolderPath(NULL
, folder
, NULL
, SHGFP_TYPE_CURRENT
, path
) != S_OK
) {
250 krb5_set_error_message(context
, EINVAL
, "Unable to determine folder path");
256 if (len
> 0 && path
[len
- 1] == '\\')
257 path
[len
- 1] = '\0';
260 strlcat(path
, postfix
, sizeof(path
)/sizeof(path
[0])) >= sizeof(path
)/sizeof(path
[0])) {
267 krb5_set_error_message(context
, ENOMEM
, "Out of memory");
276 _expand_path(krb5_context context
, PTYPE param
, const char *postfix
, char **ret
)
278 *ret
= strdup(postfix
);
280 krb5_set_error_message(context
, ENOMEM
, "malloc - out of memory");
287 _expand_temp_folder(krb5_context context
, PTYPE param
, const char *postfix
, char **ret
)
289 const char *p
= NULL
;
296 *ret
= strdup("/tmp");
303 _expand_userid(krb5_context context
, PTYPE param
, const char *postfix
, char **str
)
305 int ret
= asprintf(str
, "%ld", (unsigned long)getuid());
306 if (ret
< 0 || *str
== NULL
)
315 * Expand a %{null} token
317 * The expansion of a %{null} token is always the empty string.
321 _expand_null(krb5_context context
, PTYPE param
, const char *postfix
, char **ret
)
326 krb5_set_error_message(context
, ENOMEM
, "Out of memory");
333 static const struct token
{
336 #define FTYPE_CSIDL 0
337 #define FTYPE_SPECIAL 1
340 const char * postfix
;
342 int (*exp_func
)(krb5_context
, PTYPE
, const char *, char **);
344 #define SPECIALP(f, P) FTYPE_SPECIAL, 0, P, f
345 #define SPECIAL(f) SPECIALP(f, NULL)
349 #define CSIDLP(C,P) FTYPE_CSIDL, C, P, _expand_csidl
350 #define CSIDL(C) CSIDLP(C, NULL)
352 {"APPDATA", CSIDL(CSIDL_APPDATA
)}, /* Roaming application data (for current user) */
353 {"COMMON_APPDATA", CSIDL(CSIDL_COMMON_APPDATA
)}, /* Application data (all users) */
354 {"LOCAL_APPDATA", CSIDL(CSIDL_LOCAL_APPDATA
)}, /* Local application data (for current user) */
355 {"SYSTEM", CSIDL(CSIDL_SYSTEM
)}, /* Windows System folder (e.g. %WINDIR%\System32) */
356 {"WINDOWS", CSIDL(CSIDL_WINDOWS
)}, /* Windows folder */
357 {"USERCONFIG", CSIDLP(CSIDL_APPDATA
, "\\" PACKAGE
)}, /* Per user Heimdal configuration file path */
358 {"COMMONCONFIG", CSIDLP(CSIDL_COMMON_APPDATA
, "\\" PACKAGE
)}, /* Common Heimdal configuration file path */
359 {"LIBDIR", SPECIAL(_expand_bin_dir
)},
360 {"BINDIR", SPECIAL(_expand_bin_dir
)},
361 {"LIBEXEC", SPECIAL(_expand_bin_dir
)},
362 {"SBINDIR", SPECIAL(_expand_bin_dir
)},
364 {"LIBDIR", FTYPE_SPECIAL
, 0, LIBDIR
, _expand_path
},
365 {"BINDIR", FTYPE_SPECIAL
, 0, BINDIR
, _expand_path
},
366 {"LIBEXEC", FTYPE_SPECIAL
, 0, LIBEXECDIR
, _expand_path
},
367 {"SBINDIR", FTYPE_SPECIAL
, 0, SBINDIR
, _expand_path
},
369 {"TEMP", SPECIAL(_expand_temp_folder
)},
370 {"USERID", SPECIAL(_expand_userid
)},
371 {"uid", SPECIAL(_expand_userid
)},
372 {"null", SPECIAL(_expand_null
)}
376 _expand_token(krb5_context context
,
378 const char *token_end
,
385 if (token
[0] != '%' || token
[1] != '{' || token_end
[0] != '}' ||
386 token_end
- token
<= 2) {
388 krb5_set_error_message(context
, EINVAL
,"Invalid token.");
392 for (i
= 0; i
< sizeof(tokens
)/sizeof(tokens
[0]); i
++) {
393 if (!strncmp(token
+2, tokens
[i
].tok
, (token_end
- token
) - 2))
394 return tokens
[i
].exp_func(context
, tokens
[i
].param
,
395 tokens
[i
].postfix
, ret
);
399 krb5_set_error_message(context
, EINVAL
, "Invalid token.");
403 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
404 _krb5_expand_path_tokens(krb5_context context
,
408 char *tok_begin
, *tok_end
, *append
;
409 const char *path_left
;
412 if (path_in
== NULL
|| *path_in
== '\0') {
413 *ppath_out
= strdup("");
419 for (path_left
= path_in
; path_left
&& *path_left
; ) {
421 tok_begin
= strstr(path_left
, "%{");
423 if (tok_begin
&& tok_begin
!= path_left
) {
425 append
= malloc((tok_begin
- path_left
) + 1);
427 memcpy(append
, path_left
, tok_begin
- path_left
);
428 append
[tok_begin
- path_left
] = '\0';
430 path_left
= tok_begin
;
432 } else if (tok_begin
) {
434 tok_end
= strchr(tok_begin
, '}');
435 if (tok_end
== NULL
) {
440 krb5_set_error_message(context
, EINVAL
, "variable missing }");
444 if (_expand_token(context
, tok_begin
, tok_end
, &append
)) {
451 path_left
= tok_end
+ 1;
454 append
= strdup(path_left
);
459 if (append
== NULL
) {
465 krb5_set_error_message(context
, ENOMEM
, "malloc - out of memory");
471 size_t append_len
= strlen(append
);
472 char * new_str
= realloc(*ppath_out
, len
+ append_len
+ 1);
474 if (new_str
== NULL
) {
480 krb5_set_error_message(context
, ENOMEM
, "malloc - out of memory");
484 *ppath_out
= new_str
;
485 memcpy(*ppath_out
+ len
, append
, append_len
+ 1);
486 len
= len
+ append_len
;
492 /* Also deal with slashes */
495 for (c
= *ppath_out
; *c
; c
++)