#include "para.h"
#include "daemon.h"
#include <pwd.h>
+
+/* getgrnam() */
+#include <sys/types.h>
+#include <grp.h>
+
#include "string.h"
/**
*
* Either calls exit() or returns a valid file handle.
*/
-/* might be called from para_log, so we must not use para_log */
FILE *open_log(const char *logfile_name)
{
FILE *logfile;
if (!logfile_name)
return NULL;
- if (!(logfile = fopen(logfile_name, "a")))
+ if (!(logfile = fopen(logfile_name, "a"))) {
+ PARA_EMERG_LOG("can not open %s, uid: %d\n", logfile_name,
+ getuid());
exit(EXIT_FAILURE);
+ }
setlinebuf(logfile);
return logfile;
}
*/
void log_welcome(const char *whoami, int loglevel)
{
- PARA_INFO_LOG("welcome to %s " VERSION " ("BUILD_DATE")\n", whoami);
+ PARA_INFO_LOG("welcome to %s " PACKAGE_VERSION " ("BUILD_DATE")\n",
+ whoami);
PARA_DEBUG_LOG("using loglevel %d\n", loglevel);
}
/**
* give up superuser privileges
*
- * This function returns immediately if not invoked with EUID zero. Otherwise,
- * it tries to obtain the UID for the user specified by \a username and exits
- * if this user was not found. On success, effective and real UID and the saved
- * set-user-ID are all set to the UID of \a username.
+ * This function returns immediately if not invoked with EUID zero. Otherwise,
+ * it tries to obtain the GID of \a groupname and the UID of \a username. On
+ * success, effective and real GID/UID and the saved set-group-ID/set-user-ID
+ * are all set accordingly. On errors, an appropriate message is logged and exit()
+ * is called to terminate the process.
*
- * \sa getpwnam(3), getuid(2), setuid(2)
+ * \sa getpwnam(3), getuid(2), setuid(2), getgrnam(2), setgid(2)
*/
-void para_drop_privileges(const char *username)
+void para_drop_privileges(const char *username, const char *groupname)
{
struct passwd *p;
char *tmp;
if (geteuid())
return;
+ if (groupname) {
+ struct group *g = getgrnam(groupname);
+ if (!g) {
+ PARA_EMERG_LOG("failed to get group %s\n", groupname);
+ exit(EXIT_FAILURE);
+ }
+ if (setgid(g->gr_gid) < 0) {
+ PARA_EMERG_LOG("failed to set group id %d (%s)\n",
+ g->gr_gid, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ }
if (!username) {
PARA_EMERG_LOG("%s", "root privileges, but no user option given\n");
exit(EXIT_FAILURE);
PARA_EMERG_LOG("%s", "no such user\n");
exit(EXIT_FAILURE);
}
- PARA_NOTICE_LOG("%s", "dropping root privileges\n");
+ PARA_INFO_LOG("%s", "dropping root privileges\n");
setuid(p->pw_uid);
PARA_DEBUG_LOG("uid: %d, euid: %d\n", getuid(), geteuid());
setuid(p->pw_uid);
return make_message("%li:%02li:%02li", t / 86400,
(t / 3600) % 24, (t / 60) % 60);
}
-