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<title>[23584] trunk/launchd/src/launchd_core_logic.c</title>
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<div id="msg">
<dl>
<dt>Revision</dt> <dd><a href="http://trac.macosforge.org/projects/launchd/changeset/23584">23584</a></dd>
<dt>Author</dt> <dd>zarzycki@apple.com</dd>
<dt>Date</dt> <dd>2008-04-02 10:48:25 -0700 (Wed, 02 Apr 2008)</dd>
</dl>
<h3>Log Message</h3>
<pre><rdar://problem/5201578> Work around Unix (environmental variables and credentials are copied, not referenced)</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunklaunchdsrclaunchd_core_logicc">trunk/launchd/src/launchd_core_logic.c</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunklaunchdsrclaunchd_core_logicc"></a>
<div class="modfile"><h4>Modified: trunk/launchd/src/launchd_core_logic.c (23583 => 23584)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/launchd/src/launchd_core_logic.c 2008-04-02 17:31:16 UTC (rev 23583)
+++ trunk/launchd/src/launchd_core_logic.c 2008-04-02 17:48:25 UTC (rev 23584)
</span><span class="lines">@@ -428,6 +428,7 @@
</span><span class="cx"> static bool job_setup_machport(job_t j);
</span><span class="cx"> static void job_setup_fd(job_t j, int target_fd, const char *path, int flags);
</span><span class="cx"> static void job_postfork_become_user(job_t j);
</span><ins>+static void job_postfork_test_user(job_t j);
</ins><span class="cx"> static void job_log_pids_with_weird_uids(job_t j);
</span><span class="cx"> static void job_force_sampletool(job_t j);
</span><span class="cx"> static void job_setup_exception_port(job_t j, task_t target_task);
</span><span class="lines">@@ -3109,6 +3110,77 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void
</span><ins>+job_postfork_test_user(job_t j)
+{
+ /* This function is all about 5201578 */
+
+ const char *shell_env_var = getenv("SHELL");
+ const char *home_env_var = getenv("HOME");
+ const char *user_env_var = getenv("USER");
+ const char *logname_env_var = getenv("LOGNAME");
+ uid_t tmp_uid, local_uid = getuid();
+ gid_t tmp_gid, local_gid = getgid();
+ char shellpath[PATH_MAX];
+ char homedir[PATH_MAX];
+ char loginname[2000];
+ struct passwd *pwe;
+
+
+ if (!job_assumes(j, shell_env_var && home_env_var && user_env_var && logname_env_var
+ && strcmp(user_env_var, logname_env_var) == 0)) {
+ goto out_bad;
+ }
+
+ if ((pwe = getpwnam(user_env_var)) == NULL) {
+ job_log(j, LOG_ERR, "The account \"%s\" has been deleted out from under us!", user_env_var);
+ goto out_bad;
+ }
+
+ /*
+ * We must copy the results of getpw*().
+ *
+ * Why? Because subsequent API calls may call getpw*() as a part of
+ * their implementation. Since getpw*() returns a [now thread scoped]
+ * global, we must therefore cache the results before continuing.
+ */
+
+ tmp_uid = pwe->pw_uid;
+ tmp_gid = pwe->pw_gid;
+
+ strlcpy(shellpath, pwe->pw_shell, sizeof(shellpath));
+ strlcpy(loginname, pwe->pw_name, sizeof(loginname));
+ strlcpy(homedir, pwe->pw_dir, sizeof(homedir));
+
+ if (strcmp(shellpath, shell_env_var) != 0) {
+ job_log(j, LOG_ERR, "The %s environmental variable changed out from under us!", "SHELL");
+ goto out_bad;
+ }
+ if (strcmp(loginname, logname_env_var) != 0) {
+ job_log(j, LOG_ERR, "The %s environmental variable changed out from under us!", "USER");
+ goto out_bad;
+ }
+ if (strcmp(homedir, home_env_var) != 0) {
+ job_log(j, LOG_ERR, "The %s environmental variable changed out from under us!", "HOME");
+ goto out_bad;
+ }
+ if (local_uid != tmp_uid) {
+ job_log(j, LOG_ERR, "The %cID of the account (%u) changed out from under us (%u)!",
+ 'U', tmp_uid, local_uid);
+ goto out_bad;
+ }
+ if (local_gid != tmp_gid) {
+ job_log(j, LOG_ERR, "The %cID of the account (%u) changed out from under us (%u)!",
+ 'G', tmp_gid, local_gid);
+ goto out_bad;
+ }
+
+ return;
+out_bad:
+ job_assumes(j, runtime_kill(getppid(), SIGTERM) != -1);
+ _exit(EXIT_FAILURE);
+}
+
+void
</ins><span class="cx"> job_postfork_become_user(job_t j)
</span><span class="cx"> {
</span><span class="cx"> char loginname[2000];
</span><span class="lines">@@ -3121,7 +3193,7 @@
</span><span class="cx"> uid_t desired_uid = -1;
</span><span class="cx">
</span><span class="cx"> if (getuid() != 0) {
</span><del>- return;
</del><ins>+ return job_postfork_test_user(j);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> /*
</span></span></pre>
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