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util-linux/make-sure-sbin-resp-usr-sbin-are-in-PATH.diff

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2017-11-27 11:06:27 +01:00
Index: util-linux-2.31/login-utils/su-common.c
===================================================================
--- util-linux-2.31.orig/login-utils/su-common.c
+++ util-linux-2.31/login-utils/su-common.c
@@ -944,6 +944,117 @@ static void setenv_path(const struct pas
err(EXIT_FAILURE, _("failed to set the PATH environment variable"));
}
+/* Add or clear /sbin and /usr/sbin for the su command
+ used without `-'. */
+
+/* Set if /sbin is found in path. */
+#define SBIN_MASK 0x01
+/* Set if /usr/sbin is found in path. */
+#define USBIN_MASK 0x02
+
+static char *
+addsbin (const char *const path)
+{
+ unsigned char smask = 0;
+ char *ptr, *tmp, *cur, *ret = NULL;
+ size_t len;
+
+ if (!path || *path == 0)
+ return NULL;
+
+ tmp = xstrdup (path);
+ cur = tmp;
+ for (ptr = strsep (&cur, ":"); ptr != NULL; ptr = strsep (&cur, ":"))
+ {
+ if (!strcmp (ptr, "/sbin"))
+ smask |= SBIN_MASK;
+ if (!strcmp (ptr, "/usr/sbin"))
+ smask |= USBIN_MASK;
+ }
+
+ if ((smask & (USBIN_MASK|SBIN_MASK)) == (USBIN_MASK|SBIN_MASK))
+ {
+ free (tmp);
+ return NULL;
+ }
+
+ len = strlen (path);
+ if (!(smask & USBIN_MASK))
+ len += strlen ("/usr/sbin:");
+
+ if (!(smask & SBIN_MASK))
+ len += strlen (":/sbin");
+
+ ret = xmalloc (len + 1);
+ strcpy (tmp, path);
+
+ *ret = 0;
+ cur = tmp;
+ for (ptr = strsep (&cur, ":"); ptr; ptr = strsep (&cur, ":"))
+ {
+ if (!strcmp (ptr, "."))
+ continue;
+ if (*ret)
+ strcat (ret, ":");
+ if (!(smask & USBIN_MASK) && !strcmp (ptr, "/bin"))
+ {
+ strcat (ret, "/usr/sbin:");
+ strcat (ret, ptr);
+ smask |= USBIN_MASK;
+ continue;
+ }
+ if (!(smask & SBIN_MASK) && !strcmp (ptr, "/usr/bin"))
+ {
+ strcat (ret, ptr);
+ strcat (ret, ":/sbin");
+ smask |= SBIN_MASK;
+ continue;
+ }
+ strcat (ret, ptr);
+ }
+ free (tmp);
+
+ if (!(smask & USBIN_MASK))
+ strcat (ret, ":/usr/sbin");
+
+ if (!(smask & SBIN_MASK))
+ strcat (ret, ":/sbin");
+
+ return ret;
+}
+
+static char *
+clearsbin (const char *const path)
+{
+ char *ptr, *tmp, *cur, *ret = NULL;
+
+ if (!path || *path == 0)
+ return NULL;
+
+ tmp = strdup (path);
+ if (!tmp)
+ return NULL;
+
+ ret = xmalloc (strlen (path) + 1);
+ *ret = 0;
+ cur = tmp;
+ for (ptr = strsep (&cur, ":"); ptr; ptr = strsep (&cur, ":"))
+ {
+ if (!strcmp (ptr, "/sbin"))
+ continue;
+ if (!strcmp (ptr, "/usr/sbin"))
+ continue;
+ if (!strcmp (ptr, "/usr/local/sbin"))
+ continue;
+ if (*ret)
+ strcat (ret, ":");
+ strcat (ret, ptr);
+ }
+ free (tmp);
+
+ return ret;
+}
+
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static void modify_environment(struct su_context *su, const char *shell)
{
const struct passwd *pw = su->pwd;
@@ -982,6 +1093,22 @@ static void modify_environment(struct su
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if (getlogindefs_bool("ALWAYS_SET_PATH", 0))
setenv_path(pw);
+ else
+ {
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+ char const *path = getenv ("PATH");
+ char *new = NULL;
+
+ if (pw->pw_uid)
+ new = clearsbin (path);
+ else
+ new = addsbin (path);
+
+ if (new)
+ {
+ xsetenv ("PATH", new, 1);
+ free (new);
+ }
+ }
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if (pw->pw_uid) {
xsetenv("USER", pw->pw_name, 1);