1 /* Copyright © 2013, Intel Corporation
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 #include <sys/types.h>
33 #include <linux/limits.h>
40 /* Terminate a string representing a filename at the final '/' to
41 * eliminate the final filename component, (leaving only the directory
42 * portions of the original path).
44 * Notes: A path containing no '/' character will not be modified.
45 * A path consisting only of "/" will not be modified.
48 chop_trailing_path_component (char *path)
52 slash = strrchr (path, '/');
63 /* Find the absolute path of the currently executing binary.
65 * Returns: a string talloc'ed to 'ctx'
68 get_bin_name (void *ctx)
70 const char *link = "/proc/self/exe";
73 /* Yes, PATH_MAX is cheesy. I would have preferred to have
74 * used lstat and read the resulting st_size, but everytime I
75 * did that with /proc/self/exe I got a value of 0, (whereas
76 * with a "real" symbolic link I make myself I get the length
77 * of the filename being linked to). Go figure. */
78 int name_len = PATH_MAX + 1;
80 name = talloc_size (ctx, name_len);
82 fprintf (stderr, "Out of memory.\n");
86 name_len = readlink (link, name, name_len - 1);
88 fprintf (stderr, "Failed to readlink %s: %s\n", link,
93 name[name_len] = '\0';
98 /* Does path exist? */
100 exists (const char *path)
105 err = stat (path, &st);
107 /* Failed to stat. It either doesn't exist, or might as well not. */
114 /* Given a program name, search the PATH environment variable and
115 * return the first absolute path to 'program'.
117 * Returns: A string talloc'ed to 'ctx'.
119 * Note: This function aborts the current program if 'program' cannot
120 * be located by searching PATH.
123 search_path_for_program (void *ctx, const char *program)
125 char *orig_path, *path, *colon, *dir, *candidate;
126 void *local = talloc_new (ctx);
128 /* If the program name already contains a slash, then this is
129 * an absolute (or relative) path. Either way, we don't search
130 * PATH, since we can directly open this filename. */
131 if (strchr (program, '/'))
132 return talloc_strdup (ctx, program);
134 orig_path = path = getenv ("PATH");
137 colon = strchr (path, ':');
140 dir = talloc_strndup (local, path, colon - path);
144 path = path + strlen (path);
147 candidate = talloc_asprintf(local, "%s/%s", dir, program);
149 if (exists (candidate)) {
150 talloc_steal (ctx, candidate);
154 talloc_free (candidate);
158 fprintf (stderr, "Cannot find program %s (looked in %s)\n",
163 /* Is the given elf program 32 or 64 bit?
165 * Note: This function aborts the current program if 'program' cannot
166 * be opened as a valid ELF file. */
168 elf_bits (const char *program)
173 void *local = talloc_new (NULL);
174 char *absolute_program = search_path_for_program (local, program);
176 fd = open (absolute_program, O_RDONLY, 0);
178 fprintf (stderr, "Failed to open %s: %s\n", absolute_program,
183 if (elf_version (EV_CURRENT ) == EV_NONE) {
184 fprintf (stderr, "Failed to initialize elf library: %s\n",
189 elf = elf_begin (fd, ELF_C_READ, NULL);
191 fprintf (stderr, "Call to elf_begin on %s failed: %s\n",
192 absolute_program, elf_errmsg(-1));
196 if (elf_kind (elf) != ELF_K_ELF) {
197 fprintf (stderr, "Not an ELF object: %s\n", absolute_program);
201 if (gelf_getehdr (elf, &ehdr) == NULL) {
202 fprintf (stderr, "getehdr on %s failed: %s\n",
203 absolute_program, elf_errmsg (-1));
207 class = gelf_getclass (elf);
209 if (class == ELFCLASSNONE) {
210 fprintf (stderr, "getclass on %s failed: %s\n",
211 absolute_program, elf_errmsg (-1));
217 if (class == ELFCLASS32)
224 /* Find the appropriate path to the libfips wrapper.
226 * This involves, first, examining the elf header of the 'program'
227 * binary to be executed to know whether we should look for
228 * libfips-32.so or libfips-64.so.
230 * Next, we find the absolute patch containing the library as follows:
232 * 1. Look in same directory as current executable image
234 * This is to support running from the source directory, without
235 * having installed anything.
237 * 2. Look in relative path from $(foo)/$(bindir) to
238 * $(foo)/$(libdir)/fips based on $(foo) from current executable
239 * image and configured $(bindir) and $(libdir).
241 * We do this rather than looking directly at the configured
242 * $(libdir) to support cases where the application may have been
243 * moved after being installed, (in particular, we want to be
244 * particularly careful not to mix one program with a different
245 * wrapper---so this "nearest search" should most often be
248 * Returns: a string talloc'ed to 'ctx'
251 find_libfips_path (void *ctx, const char *program)
253 char *bin_path, *library, *lib_path;
256 bits = elf_bits (program);
258 library = talloc_asprintf(ctx, "libfips-%d.so", bits);
260 bin_path = get_bin_name (ctx);
262 chop_trailing_path_component (bin_path);
264 lib_path = talloc_asprintf(ctx, "%s/%s", bin_path, library);
266 if (exists (lib_path))
269 talloc_free (lib_path);
271 lib_path = talloc_asprintf(ctx, "%s/" BINDIR_TO_LIBFIPSDIR "/%s",
274 if (exists (lib_path))
277 fprintf (stderr, "Error: Failed to find library %s.\n", library);
278 fprintf (stderr, "Looked in both:\n"
281 "\t%s/" BINDIR_TO_LIBFIPSDIR "\n", bin_path, bin_path);
283 fprintf(stderr, "\nIt's possible fips was not compiled with support for %d-bit applications.\n", bits);
284 fprintf(stderr, "Perhaps you need to install gcc-multilib and re-compile fips?\n");
289 execute_with_fips_preload (int argc, char * const argv[])
291 void *ctx = talloc_new (NULL);
293 char *ld_preload_value;
297 execvp_args = malloc((argc + 1) * sizeof(char *));
298 if (execvp_args == NULL) {
299 fprintf (stderr, "Out of memory,\n");
303 for (i = 0; i < argc; i++) {
304 execvp_args[i] = argv[i];
307 /* execvp needs final NULL */
308 execvp_args[i] = NULL;
310 lib_path = find_libfips_path (ctx, argv[0]);
312 ld_preload_value = getenv ("LD_PRELOAD");
314 if (ld_preload_value) {
315 ld_preload_value = talloc_asprintf(ctx, "%s:%s",
319 ld_preload_value = lib_path;
322 setenv ("LD_PRELOAD", ld_preload_value, 1);
326 execvp (argv[0], argv);
327 fprintf (stderr, "Failed to execute:");
328 for (i = 0; argv[i]; i++) {
329 fprintf (stderr, " %s", argv[i]);
331 fprintf (stderr, "\n");