Line data Source code
1 : /*
2 : * Copyright (c) 2017 Kungliga Tekniska Högskolan
3 : * (Royal Institute of Technology, Stockholm, Sweden).
4 : * All rights reserved.
5 : *
6 : * Redistribution and use in source and binary forms, with or without
7 : * modification, are permitted provided that the following conditions
8 : * are met:
9 : *
10 : * 1. Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
12 : *
13 : * 2. Redistributions in binary form must reproduce the above copyright
14 : * notice, this list of conditions and the following disclaimer in the
15 : * documentation and/or other materials provided with the distribution.
16 : *
17 : * 3. Neither the name of the Institute nor the names of its contributors
18 : * may be used to endorse or promote products derived from this software
19 : * without specific prior written permission.
20 : *
21 : * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 : * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 : * SUCH DAMAGE.
32 : */
33 :
34 : #include <config.h>
35 : #include "roken.h"
36 :
37 : #ifdef WIN32
38 : #include <Shlobj.h> // need to include definitions of constants
39 : #define SECURITY_WIN32
40 : #include <security.h>
41 : #else
42 : #include <sys/types.h>
43 : #include <pwd.h>
44 : #include <unistd.h>
45 : #endif
46 :
47 : /**
48 : * Returns the user's SHELL.
49 : */
50 : ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
51 0 : roken_get_shell(char *shell, size_t shellsz)
52 : {
53 0 : char *p;
54 :
55 : #ifndef WIN32
56 : #ifdef HAVE_GETPWNAM_R
57 0 : size_t buflen = 2048;
58 :
59 0 : if (sysconf(_SC_GETPW_R_SIZE_MAX) > 0)
60 0 : buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
61 : #endif
62 :
63 0 : if (issuid())
64 0 : return "/bin/sh";
65 :
66 0 : p = secure_getenv("SHELL");
67 0 : if (p != NULL && p[0] != '\0') {
68 0 : if (strlcpy(shell, p, shellsz) < shellsz)
69 0 : return shell;
70 0 : errno = ERANGE;
71 0 : return NULL;
72 : }
73 :
74 : #ifdef HAVE_GETPWNAM_R
75 0 : {
76 0 : struct passwd pwd;
77 0 : struct passwd *pwdp;
78 0 : char buf[buflen];
79 0 : char user[128];
80 0 : const char *username = roken_get_username(user, sizeof(user));
81 :
82 0 : if (username &&
83 0 : getpwnam_r(username, &pwd, buf, buflen, &pwdp) == 0 &&
84 0 : pwdp != NULL && pwdp->pw_shell != NULL) {
85 0 : if (strlcpy(shell, pwdp->pw_shell, shellsz) < shellsz)
86 0 : return shell;
87 0 : errno = ERANGE;
88 0 : return NULL;
89 : }
90 : }
91 : #endif
92 0 : errno = 0;
93 0 : return "/bin/sh";
94 : #else
95 : /* Windows */
96 : p = getenv("SHELL");
97 : if (p != NULL && p[0] != '\0') {
98 : if (strlcpy(shell, p, shellsz) < shellsz)
99 : return shell;
100 : errno = ERANGE;
101 : return NULL;
102 : }
103 : errno = 0;
104 : return NULL;
105 : #endif
106 : }
107 :
108 : /**
109 : * Returns the home directory.
110 : */
111 : ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
112 790267 : roken_get_homedir(char *home, size_t homesz)
113 : {
114 19516 : char *p;
115 :
116 : #ifdef WIN32
117 : if (homesz < MAX_PATH) {
118 : errno = ERANGE;
119 : return NULL;
120 : }
121 :
122 : if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_PROFILE, NULL,
123 : SHGFP_TYPE_CURRENT, home)))
124 : return home;
125 :
126 : if ((p = getenv("HOMEDRIVE")) != NULL && p[0] != '\0') {
127 : if (strlcpy(home, p, homesz) >= homesz) {
128 : errno = ERANGE;
129 : return NULL;
130 : }
131 : if ((p = getenv("HOMEPATH")) != NULL) {
132 : if (strlcat(home, p, homesz) < homesz)
133 : return home;
134 : errno = ERANGE;
135 : return NULL;
136 : }
137 : return home;
138 : }
139 : HEIM_FALLTHROUGH;
140 : #else
141 : #ifdef HAVE_GETPWNAM_R
142 790267 : size_t buflen = 2048;
143 :
144 790267 : if (sysconf(_SC_GETPW_R_SIZE_MAX) > 0)
145 790267 : buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
146 : #endif
147 :
148 790267 : if (issuid()) {
149 0 : errno = 0;
150 0 : return NULL;
151 : }
152 :
153 790267 : p = secure_getenv("HOME");
154 790267 : if (p != NULL && p[0] != '\0') {
155 790267 : if (strlcpy(home, p, homesz) < homesz)
156 770751 : return home;
157 0 : errno = ERANGE;
158 0 : return NULL;
159 : }
160 :
161 : #ifdef HAVE_GETPWNAM_R
162 0 : {
163 0 : char user[128];
164 0 : const char *username = roken_get_username(user, sizeof(user));
165 0 : struct passwd pwd;
166 0 : struct passwd *pwdp;
167 0 : char buf[buflen];
168 :
169 0 : if (username &&
170 0 : getpwnam_r(username, &pwd, buf, buflen, &pwdp) == 0 &&
171 0 : pwdp != NULL && pwdp->pw_dir != NULL) {
172 0 : if (strlcpy(home, pwdp->pw_dir, homesz) < homesz)
173 0 : return home;
174 0 : errno = ERANGE;
175 0 : return NULL;
176 : }
177 : }
178 : #endif
179 : #endif
180 0 : errno = 0;
181 0 : return NULL;
182 : }
183 :
184 : /**
185 : * Returns the home directory on Unix, or the AppData directory on
186 : * Windows.
187 : */
188 : ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
189 0 : roken_get_appdatadir(char *appdata, size_t appdatasz)
190 : {
191 : #ifdef WIN32
192 : char *p;
193 : #endif
194 :
195 : #ifndef WIN32
196 0 : return roken_get_homedir(appdata, appdatasz);
197 : #else
198 : if (appdatasz < MAX_PATH) {
199 : errno = ERANGE;
200 : return NULL;
201 : }
202 :
203 : if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_APPDATA, NULL,
204 : SHGFP_TYPE_CURRENT, appdata)))
205 : return appdata;
206 :
207 : if ((p = getenv("APPDATA")) != NULL && p[0] != '\0') {
208 : if (strlcpy(appdata, p, appdatasz) < appdatasz)
209 : return appdata;
210 : errno = ERANGE;
211 : return NULL;
212 : }
213 :
214 : errno = 0;
215 : return NULL;
216 : #endif
217 : }
218 :
219 : /**
220 : * Return a bare username. This is used for, e.g., constructing default
221 : * principal names.
222 : *
223 : * On POSIX systems, if the caller is not set-uid-like, then this will return
224 : * the value of the USER or LOGNAME environment variables (in that order of
225 : * preference), else the username found by looking up the effective UID.
226 : */
227 : ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
228 0 : roken_get_username(char *user, size_t usersz)
229 : {
230 0 : char *p;
231 :
232 : #ifdef WIN32
233 : ULONG sz = usersz;
234 :
235 : if (GetUserNameEx(NameSamCompatible, user, &sz)) {
236 : /*
237 : * There's no EXTENDED_NAME_FORMAT for "bare username". We we
238 : * have to parse one.
239 : */
240 : p = strchr(user, '\\');
241 : if (p != NULL) {
242 : p++;
243 : memmove(user, p, strlen(p) + 1);
244 : }
245 : return user;
246 : } else {
247 : DWORD err = GetLastError();
248 : if (err == ERROR_MORE_DATA) {
249 : errno = ERANGE;
250 : return NULL;
251 : }
252 : /* %USERNAME% is generally bare */
253 : p = getenv("USERNAME");
254 : if (p != NULL && p[0] != '\0') {
255 : if (strchr(p, '\\') != NULL)
256 : p = strchr(p, '\\') + 1;
257 : if (strlcpy(user, p, usersz) < usersz)
258 : return user;
259 : errno = ERANGE;
260 : return NULL;
261 : }
262 : }
263 : #else
264 : #ifdef HAVE_GETPWUID_R
265 0 : size_t buflen = 2048;
266 :
267 0 : if (sysconf(_SC_GETPW_R_SIZE_MAX) > 0)
268 0 : buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
269 : #endif
270 :
271 0 : p = secure_getenv("USER");
272 0 : if (p == NULL || p[0] == '\0')
273 0 : p = secure_getenv("LOGNAME");
274 0 : if (p != NULL && p[0] != '\0') {
275 0 : if (strlcpy(user, p, usersz) < usersz)
276 0 : return user;
277 0 : errno = ERANGE;
278 0 : return NULL;
279 : }
280 :
281 : #ifdef HAVE_GETPWUID_R
282 0 : {
283 0 : struct passwd pwd;
284 0 : struct passwd *pwdp;
285 0 : char buf[buflen];
286 :
287 0 : if (getpwuid_r(getuid(), &pwd, buf, buflen, &pwdp) == 0 &&
288 0 : pwdp != NULL && pwdp->pw_name != NULL) {
289 0 : if (strlcpy(user, pwdp->pw_name, usersz) < usersz)
290 0 : return user;
291 0 : errno = ERANGE;
292 0 : return NULL;
293 : }
294 : }
295 : #endif
296 : #endif
297 0 : errno = 0;
298 0 : return NULL;
299 : }
300 :
301 : /**
302 : * Return a bare username. This is used for, e.g., constructing default
303 : * principal names.
304 : *
305 : * On POSIX systems this returns the name recorded in the system as currently
306 : * logged in on the current terminal.
307 : */
308 : ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
309 0 : roken_get_loginname(char *user, size_t usersz)
310 : {
311 : #ifdef WIN32
312 : return roken_get_username(user, usersz);
313 : #else
314 : #ifdef HAVE_GETLOGIN_R
315 : if ((errno = getlogin_r(user, usersz)) == 0)
316 : return user;
317 : if (errno != ENOENT)
318 : return NULL;
319 : #else
320 : #ifdef HAVE_GETLOGIN
321 : if ((p = getlogin()) != NULL && p[0] != '\0') {
322 : if (strlcpy(user, p, usersz) < usersz)
323 : return user;
324 : errno = ERANGE;
325 : return NULL;
326 : }
327 : if (errno != ENOENT)
328 : return NULL;
329 : #endif
330 : #endif
331 0 : errno = 0;
332 0 : return NULL;
333 : #endif
334 : }
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