2 /***********************************************************************
3 * Copyright (c) 2009, Secure Endpoints Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
29 * OF THE POSSIBILITY OF SUCH DAMAGE.
31 **********************************************************************/
33 #include "krb5_locl.h"
42 * Expand a %{TEMP} token
44 * The %{TEMP} token expands to the temporary path for the current
45 * user as returned by GetTempPath().
47 * @note: Since the GetTempPath() function relies on the TMP or TEMP
48 * environment variables, this function will failover to the system
49 * temporary directory until the user profile is loaded. In addition,
50 * the returned path may or may not exist.
53 _expand_temp_folder(krb5_context context, PTYPE param, const char *postfix, char **ret)
55 TCHAR tpath[MAX_PATH];
58 if (!GetTempPath(sizeof(tpath)/sizeof(tpath[0]), tpath)) {
60 krb5_set_error_message(context, EINVAL,
61 "Failed to get temporary path (GLE=%d)",
68 if (len > 0 && tpath[len - 1] == '\\')
69 tpath[len - 1] = '\0';
75 krb5_set_error_message(context, ENOMEM, "strdup - Out of memory");
82 extern HINSTANCE _krb5_hInstance;
85 * Expand a %{BINDIR} token
87 * This is also used to expand a few other tokens on Windows, since
88 * most of the executable binaries end up in the same directory. The
89 * "bin" directory is considered to be the directory in which the
90 * krb5.dll is located.
93 _expand_bin_dir(krb5_context context, PTYPE param, const char *postfix, char **ret)
99 nc = GetModuleFileName(_krb5_hInstance, path, sizeof(path)/sizeof(path[0]));
101 nc == sizeof(path)/sizeof(path[0])) {
105 lastSlash = strrchr(path, '\\');
106 if (lastSlash != NULL) {
107 TCHAR *fslash = strrchr(lastSlash, '/');
116 if (strlcat(path, postfix, sizeof(path)/sizeof(path[0])) >= sizeof(path)/sizeof(path[0]))
128 * Expand a %{USERID} token
130 * The %{USERID} token expands to the string representation of the
131 * user's SID. The user account that will be used is the account
132 * corresponding to the current thread's security token. This means
135 * - If the current thread token has the anonymous impersonation
136 * level, the call will fail.
138 * - If the current thread is impersonating a token at
139 * SecurityIdentification level the call will fail.
143 _expand_userid(krb5_context context, PTYPE param, const char *postfix, char **ret)
146 HANDLE hThread = NULL;
147 HANDLE hToken = NULL;
148 PTOKEN_OWNER pOwner = NULL;
150 LPTSTR strSid = NULL;
152 hThread = GetCurrentThread();
154 if (!OpenThreadToken(hThread, TOKEN_QUERY,
155 FALSE, /* Open the thread token as the
156 current thread user. */
159 DWORD le = GetLastError();
161 if (le == ERROR_NO_TOKEN) {
162 HANDLE hProcess = GetCurrentProcess();
165 if (!OpenProcessToken(hProcess, TOKEN_QUERY, &hToken))
171 krb5_set_error_message(context, rv,
172 "Can't open thread token (GLE=%d)", le);
177 if (!GetTokenInformation(hToken, TokenOwner, NULL, 0, &len)) {
178 if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
180 krb5_set_error_message(context, rv,
181 "Unexpected error reading token information (GLE=%d)",
188 krb5_set_error_message(context, rv,
189 "GetTokenInformation() returned truncated buffer");
193 pOwner = malloc(len);
194 if (pOwner == NULL) {
196 krb5_set_error_message(context, rv, "Out of memory");
201 krb5_set_error_message(context, rv, "GetTokenInformation() returned truncated buffer");
205 if (!GetTokenInformation(hToken, TokenOwner, pOwner, len, &len)) {
207 krb5_set_error_message(context, rv, "GetTokenInformation() failed. GLE=%d", GetLastError());
211 if (!ConvertSidToStringSid(pOwner->Owner, &strSid)) {
213 krb5_set_error_message(context, rv, "Can't convert SID to string. GLE=%d", GetLastError());
217 *ret = strdup(strSid);
218 if (*ret == NULL && context)
219 krb5_set_error_message(context, rv, "Out of memory");
237 * Expand a folder identified by a CSIDL
241 _expand_csidl(krb5_context context, PTYPE folder, const char *postfix, char **ret)
243 TCHAR path[MAX_PATH];
246 if (SHGetFolderPath(NULL, folder, NULL, SHGFP_TYPE_CURRENT, path) != S_OK) {
248 krb5_set_error_message(context, EINVAL, "Unable to determine folder path");
254 if (len > 0 && path[len - 1] == '\\')
255 path[len - 1] = '\0';
258 strlcat(path, postfix, sizeof(path)/sizeof(path[0])) >= sizeof(path)/sizeof(path[0])) {
265 krb5_set_error_message(context, ENOMEM, "Out of memory");
274 _expand_path(krb5_context context, PTYPE param, const char *postfix, char **ret)
276 *ret = strdup(postfix);
278 krb5_set_error_message(context, ENOMEM, "malloc - out of memory");
285 _expand_temp_folder(krb5_context context, PTYPE param, const char *postfix, char **ret)
287 const char *p = NULL;
294 *ret = strdup("/tmp");
301 _expand_userid(krb5_context context, PTYPE param, const char *postfix, char **str)
303 int ret = asprintf(str, "%ld", (unsigned long)getuid());
304 if (ret < 0 || *str == NULL)
313 * Expand a %{null} token
315 * The expansion of a %{null} token is always the empty string.
319 _expand_null(krb5_context context, PTYPE param, const char *postfix, char **ret)
324 krb5_set_error_message(context, ENOMEM, "Out of memory");
331 static const struct token {
334 #define FTYPE_CSIDL 0
335 #define FTYPE_SPECIAL 1
338 const char * postfix;
340 int (*exp_func)(krb5_context, PTYPE, const char *, char **);
342 #define SPECIALP(f, P) FTYPE_SPECIAL, 0, P, f
343 #define SPECIAL(f) SPECIALP(f, NULL)
347 #define CSIDLP(C,P) FTYPE_CSIDL, C, P, _expand_csidl
348 #define CSIDL(C) CSIDLP(C, NULL)
350 {"APPDATA", CSIDL(CSIDL_APPDATA)}, /* Roaming application data (for current user) */
351 {"COMMON_APPDATA", CSIDL(CSIDL_COMMON_APPDATA)}, /* Application data (all users) */
352 {"LOCAL_APPDATA", CSIDL(CSIDL_LOCAL_APPDATA)}, /* Local application data (for current user) */
353 {"SYSTEM", CSIDL(CSIDL_SYSTEM)}, /* Windows System folder (e.g. %WINDIR%\System32) */
354 {"WINDOWS", CSIDL(CSIDL_WINDOWS)}, /* Windows folder */
355 {"USERCONFIG", CSIDLP(CSIDL_APPDATA, "\\" PACKAGE)}, /* Per user Heimdal configuration file path */
356 {"COMMONCONFIG", CSIDLP(CSIDL_COMMON_APPDATA, "\\" PACKAGE)}, /* Common Heimdal configuration file path */
357 {"LIBDIR", SPECIAL(_expand_bin_dir)},
358 {"BINDIR", SPECIAL(_expand_bin_dir)},
359 {"LIBEXEC", SPECIAL(_expand_bin_dir)},
360 {"SBINDIR", SPECIAL(_expand_bin_dir)},
362 {"LIBDIR", FTYPE_SPECIAL, 0, LIBDIR, _expand_path},
363 {"BINDIR", FTYPE_SPECIAL, 0, BINDIR, _expand_path},
364 {"LIBEXEC", FTYPE_SPECIAL, 0, LIBEXECDIR, _expand_path},
365 {"SBINDIR", FTYPE_SPECIAL, 0, SBINDIR, _expand_path},
367 {"TEMP", SPECIAL(_expand_temp_folder)},
368 {"USERID", SPECIAL(_expand_userid)},
369 {"uid", SPECIAL(_expand_userid)},
370 {"null", SPECIAL(_expand_null)}
374 _expand_token(krb5_context context,
376 const char *token_end,
383 if (token[0] != '%' || token[1] != '{' || token_end[0] != '}' ||
384 token_end - token <= 2) {
386 krb5_set_error_message(context, EINVAL,"Invalid token.");
390 for (i = 0; i < sizeof(tokens)/sizeof(tokens[0]); i++) {
391 if (!strncmp(token+2, tokens[i].tok, (token_end - token) - 2))
392 return tokens[i].exp_func(context, tokens[i].param,
393 tokens[i].postfix, ret);
397 krb5_set_error_message(context, EINVAL, "Invalid token.");
401 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
402 _krb5_expand_path_tokens(krb5_context context,
406 char *tok_begin, *tok_end, *append;
407 const char *path_left;
410 if (path_in == NULL || *path_in == '\0') {
411 *ppath_out = strdup("");
417 for (path_left = path_in; path_left && *path_left; ) {
419 tok_begin = strstr(path_left, "%{");
421 if (tok_begin && tok_begin != path_left) {
423 append = malloc((tok_begin - path_left) + 1);
425 memcpy(append, path_left, tok_begin - path_left);
426 append[tok_begin - path_left] = '\0';
428 path_left = tok_begin;
430 } else if (tok_begin) {
432 tok_end = strchr(tok_begin, '}');
433 if (tok_end == NULL) {
438 krb5_set_error_message(context, EINVAL, "variable missing }");
442 if (_expand_token(context, tok_begin, tok_end, &append)) {
449 path_left = tok_end + 1;
452 append = strdup(path_left);
457 if (append == NULL) {
463 krb5_set_error_message(context, ENOMEM, "malloc - out of memory");
469 size_t append_len = strlen(append);
470 char * new_str = realloc(*ppath_out, len + append_len + 1);
472 if (new_str == NULL) {
478 krb5_set_error_message(context, ENOMEM, "malloc - out of memory");
482 *ppath_out = new_str;
483 memcpy(*ppath_out + len, append, append_len + 1);
484 len = len + append_len;
490 /* Also deal with slashes */
493 for (c = *ppath_out; *c; c++)